ABB Zenith ZTE ZBTE Series OM Manual.pdf

OPERATION AND MAINTENANCE MANUAL

Zenith ZTE series For ZTE and ZBTE series Automatic Transfer Switches, 40-4000 A

Authorized Service

For ABB parts and service call: + -, option #3 or + -

Table of Contents

Introduction, Safety & Storage Installation

Mounting Inspection Prior to Initial Energization

Initial Testing & Energization of the Switch Manual Testing of Mechanism Electrical Testing of the Switch (Source 1 = utility, Source 2 = generator)

The Control Connections The MX350 Controller

The MX350 Graphical Display & Keypad Switch Exerciser

Controller Power Supply (UTA – Universal Transformer Assembly) Sequence of Operation Sequence of Operation for Bypass/Isolation Transfer Switch Troubleshooting & Diagnostics Maintenance & Testing Notes

Information subject to change without notice.

Please verify all details with ABB.

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 1 ABB Zenith

Introduction, Safety & Storage

ABB transfer switches are used to provide a continuous source of power for mission, process and healthcare critical loads by automatically transferring from a pre-ferred source of power Source 1 (or Normal Source) to a non-preferred alternate Source 2 (or Emergency) power source (typically a generator) in the event that Source 1 operational parameters fall outside preset limits.

Voltage and current sensing and system controls are performed via a state-of-the-art microcontroller located on the cabinet door. It is designed to give highly accurate control of the transfer switch system.

All ABB transfer switches are designed for use on emergency or standby systems and are rated for total system or motor loads. Transfer switches are UL listed under Standard 1008 and CSA certified under Standard C22.2 No. 178.

The safe operation of your switch at all times is ABB’s focus.

It must be recognized that hazardous voltages and currents can exist during normal operation and any maintenance on the transfer switch must be performed utilizing appropriate safety measures. Installation, adjustment, maintenance or removal of the switch must only be carried out by qualified personnel with all power to the switch turned off. It is recommended that only qualified electricians be allowed to install or provide maintenance on the switch.

Regarding the switch itself, proper storage, installation, operation and maintenance will help increase its operational life. Upon initial receipt of the transfer switch, inspect for any damage. This includes damage to the enclosure, power panel, control panel and wiring harnesses. If any damage is found or suspected, file a claim as soon as possible with the carrier and notify the nearest ABB representative, or call + - or + -.

Prior to installation store the transfer switch in a clean dry location, protected from dirt and water. Provide ample air circulation and heat, if necessary, to prevent condensation.

See Table 1 for recommended storage and ambient operating temperatures.

CAUTION

Due to hazardous voltages and currents, ABB recommends that an ABB Certified technician or a qualified electrician perform the installation and maintenance of the switch.

DANGER

HAZARDOUS VOLTAGE CAN CAUSE

SEVERE INJURY OR DEATH

Turn OFF all power before installation, adjustment or removal of transfer switch or any of its components.

NOTE

A protective device such as a molded case circuit breaker or fused disconnect switch MUST be installed on both sources of incoming power for circuit protection and as a disconnect device.

All references made within this manual about the terms “Source 1”, “S1” or “Preferred Source” relate to a “Normal” power source (typically from a utility source). References made to “Source 2”, “S2”, “Non-preferred Source” or “Alternate Source” relate to an Emergency Source (many times a generator).

Table 1 Storage and Operating Ambient Temperatures

5% to 95% (non-condensing)

-30°C to +75°C (-22°F to +167°F)

40-400 AMP

(molded shell) -20°C to +65°C (-4°F to +149°F)

40-4000 AMP

(all other frame and panel types) -20°C to +60°C (-4°F to +140°F)

Storage Temperature Humidity

Operating Temperature (Ambient)

Figure 1 Method of Moving Transfer Switch

NOTE: When lifting the switch using a spreader bar, height H must be equal to half of distance D.

ABB Zenith Page 2 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Installation

When preparing to install the transfer switch, review the documentation included with the unit. Each ABB transfer switch is factory wired and tested. A complete documen-tation package is furnished with each switch, providing descriptions and schematics for the following:

a. Standard and non-standard control interface signals and options.

b. Sequence of operations.

c. Standard indicators, pushbuttons and annunciators.

d. Controller failure and return settings and time delays.

e. Description of the programmable engine exerciser.

f. Standard programmable control of switch operation.

g. User-configurable input and output.

h. System schematics:

1. Overall switch system.

2. Universal transformer assembly (UTA) power supply.

3. Transfer switch device layout.

4. Transfer switch power panel layout.

5. Interconnect plugs.

6. Customer connection wiring.

Mounting Adequate lifting means must be used to mount the transfer switch into place. The recommended method for moving the ATS using lifting eyes, where supplied, and a spreader bar is illustrated in Figure 1. Enough room should be allowed to open the cabinet door(s) fully for inspection and servicing of the switch per NEC and local codes.

Inspection Prior to Initial Energization Prior to energizing the transfer switch, perform the following:

1. With a vacuum, remove any debris collected on the switch during shipment or installation.

2. Check engine start connections. The engine-start terminals are located on terminal block positions 1 through 3 (see Figures 2 and 3). The E contact provides the engine start signal from the automatic transfer switch controller to the genset. The terminal block has two sets of A3 (Source 2 position) normally open contacts (NO) and two sets of A4 (Source 1 position) NO contacts.

3. Verify the correct connection of all control wires.

4. Check settings of all timers and adjust as necessary.

5. Adjust any optional accessories as required.

6. Verify that all Source 1, Source 2 and Load cables are correctly connected to the clearly marked terminals on the unit.

7. Verify from Table 2 the number and sizes of cable lugs, which are supplied as standard per the switch amperage rating. Most transfer switches are sup-plied with UL listed solderless screw-type terminals as standard for the Source 1, Source 2 and Load power connections.

8. Verify equipment ground cable(s) are installed per NEC and/or local codes.

9. Verify that all cable lug connections are tightened in accordance with torque values in Table 3.

10. Remove surface oxides from cables by cleaning with a wire brush.

11. Make sure that all covers and barriers are installed and properly fastened.

NOTE

Power panels ship from ABB connected to Source 1.

NOTE

All control wires (18-12 AWG) must be torqued to 19 in/lbs (1.6 lb-ft) (2.2 N-m)

CAUTION

Before drilling conduit entry holes or any accessory mounting holes, cover and protect the switch and control panel to prevent dirt and metal fragments from entering the mechanical and electrical components of the switch.

Failure to do so may result in damage and malfunction of the switch and void the warranty.

Table 2 Power Connections: Screw Type Terminals for External Power Connections

Switch Size (Amps) Source 1, Source 2 & Load Terminals Neutral Bar (When Required)

Cable Per Pole Range of Wire Sizes No. of Cables per lug Range of Wire Sizes 40 1 #8 AWG to 1/0 3 #8 AWG to 1/0

80 1 #8 AWG to 1/0 3 #8 AWG to 1/0

100 1 #8 AWG to 1/0 3 #8 AWG to 1/0

150 1 #8 AWG to 3/0 3 #8 AWG to 300 MCM

225 1 #6 AWG to 250 MCM 3 #6 AWG to 300 MCM

260, 400 1 #4 AWG to 600 MCM 3 #4 AWG to 300 MCM

600 2 #2 AWG to 600 MCM 8 #2 AWG to 600 MCM

800, 1000, 1200 4 #2 AWG to 600 MCM 12 #2 AWG to 600 MCM

1600, 2000, 3000, 4000 Line, Load and Neutral terminals are located in the rear of switch and arranged with bare bus bar

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 3 ABB Zenith

Table 3 Tightening Torque for Lugs

Figure 2 Typical Switch Component Arrangement Inside Enclosure 1200-1600A Bypass Shown Below

Terminal Block (TB) (Engine start contact terminals, source 1 and 2 position contacts)

Input Relay (typ.)

Universal Transformer Assembly (UTA) Power Supply

ATS

Power Panel

Backside of MX350 Graphical Control Panel

MX350 Modular Controller (CPU, power supply, sensing CT card, I/O cards, etc.)

Disconnect Switch (DS)

Load

Current Transformer (CT)

Block Source 2

Source 1

Socket Size Across Flats Torque in mm lb-in lb-ft N-m 1/8 3 45 4 5

5/32 4 100 8 11

3/16 5 120 10 14

7/32 5.5 150 12 17

1/4 6 200 17 23

5/16 8 275 23 31

3/8 10 375 31 42

1/2 13 500 42 56

9/16 14 600 50 68

Bypass Isolation ATS Power Panel

Output Relay (typ.)

ABB Zenith Page 4 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Figure 3 Representative Schematic of Terminal Board, Output Strip and Input Strip Refer to Electrical Schematic Drawing for additional details

CUSTOMER USEA1 OUT5 11

M X3

C

O N

TR

O

LL

ER

TO

L

-C

AR

D S

LO

T

“G ” O

N

G OUTPUT STRIP

OUTPUT-512A2 14

5-3

5-2

L5 L6

L4 L3 L2 L1

G2

G6

G4

G5

G3

J8 G1

J7

OUTPUT-4

FACTORY USED (FOR ALARM)

FOR CUSTOMER USE

STATUS OUTPUT CONTACT

SHUNT TRIP EMERG. BKR.

LOAD SHED

STATUS OUTPUT CONTACT

FOR CUSTOMER USE

ABB ZENITH

OUT4A1

A2

OUT3A1

A2

CONTROLS

A1 OUT1

OUT2

A2

A1

A2

4-2

4-3

5-1

4-1

3-3

3-2

2-3

3-1

1-3

2-2

1-2

2-1

1-1

OUTPUT

CONTACTS FOR

CONFIGURABLE

OTHERS

G INPUT STRIP

L9

M X3

C

O N

TR

O

LL

ER

TO

L

-C

AR

D S

LO

T

“G ” O

N

L13 L14

L12 L11 L10

G9

G13 G14

G12

G10 G11

L7 L8

J6

G8 G7

J5

+ (SUPPLIED BY OTHERS)

(SUPPLIED BY OTHERS)

(SEE NOTE 3)

(SEE NOTE 4)

(SEE NOTE 8)

CCNO

IN7

A2

A1

IN5

IN6

A2

A1

A2

A1

COM

25ZA

NO

NO

CC

CC

IN1 11A1

IN3A1

IN4A1

A2

A2

IN2A1

A2

A2

ABB ZENITH

CONTROLS

R15

NO

NO

CC

CC

Q2

DS

NO C

FO

R

C U

ST

O

M

ER

U

SE

CO

N

FI

G

U

RA

BL

E

IN

PU

TS

O

PT

IO

N P

AC

KA

G E

OTHERS

COM

COM

CONNECTIONS OF THE TRANSFER SWITCH.

COMPONENTS DRAWN IN DASHED LINES ARE OPTION PACKAGE AND CUSTOMER

Q2 (TEST WITH LOAD) IS PROVIDED AS STANDARD (PRE-CONFIGURED) FEATURE.

R15 (LOAD SHED) IS PROVIDED AS AN OPTION (PRE-CONFIGURED) FEATURE.

ATS SHOWN IN SOURCE-1 POSITION WITH NO POWER AVAILABLE.

UNLESS OTHERWISE SPECIFIED ALL CUSTOMER CONNECTION WIRES TO BE #14 AWG.,

OUTPUT STRIP CONTACTS ARE RATED 10 AMPS AT 30VDC/250VAC.

ENGINE START CONTACT IS RATED 10 AMPS AT 28VDC/120VAC.

600V.

6.

7.

5.

4.

3.

2.

1.

NOTES

8. ENGINE START CONTACT MAY BE ON SEPARATE TERMINAL BLOCK FOR BYPASS

SWITCHES. REFER TO ELECTRICAL SCHEMATIC FOR TERMINAL LOCATION.

A4-1

A3-1

A3-2

CARD

K

C

C

C

E12

E11

E13

NO

NO

NO

A3-2

CA3-1

A3-1

CA4-1

A4-1

CA3-2

A4-2 C

AUX

NO

CA4-2

A4-2

CLOSED IN SOURCE 2 POSITION.

(2) NORMALLY OPEN CONTACTS.

FOR CUSTOMER USE.

FOR CUSTOMER USE

CONTACT

E

ENGINE START CONTACT

(2) NORMALLY OPEN CONTACTS

TB

FOR CUSTOMER USE.

HELD CLOSED IN SOURCE 1 POSITION

CARD

K

TB

ENG. START

8 7

8 9

PA3 TP1

E11

E13

E12

NO

NO

NO

NO

NO

NO

C

AB4-5

AB3-6

C

C

A3-1 C

A4-1

A3-2

C

A4-2 C

CA3-1

A3-1

CA3-2

CA4-1

CA4-2

A3-2

A4-1

A4-2

AUX

ABB OTHERSABB OTHERS

(2) NORMALLY OPEN

CONTACTS, HELD CLOSED IN

SOURCE 1 POSITION FOR

CUSTOMER USE. SEE NOTE 1

(2) NORMALLY OPEN

CONTACTS, CLOSED IN

SOURCE 2 POSITION

FOR CUSTOMER USE.

IS IN SOURCE 1 POSITION.

CONTACT CLOSED WHEN BYPASS

FOR CUSTOMER USE.

CONTACT CLOSED WHEN BYPASS

IS IN SOURCE 2 POSITION.

FOR CUSTOMER USE.

CONTACT

E

FOR CUSTOMER USE

ENGINE START CONTACT

Non-Bypass ATS Bypass ATS

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 5 ABB Zenith

Initial Testing and Energization of the Switch

Manual Testing of Mechanism A manual operator handle is provided with the transfer switch for maintenance purposes only. Manual operation of the switch must be checked before it is operated electrically. All power sources must be disconnected before manual operation of the switch is attempted.

Insert the handle and operate the transfer switch between the Source 1 and Source 2 positions. The transfer switch should operate smoothly without binding. After insuring the switch mechanically transfers adequately, return the switch to Source 1 position, remove the handle and return it to the holder provided.

Before proceeding, refer to the information package supplied with the ATS. Read and understand the information on all accessories installed.

Figure 4 Transfer Switch Equipment Rating Nameplate (Typical)

AUTOMATIC TRANSFER SWITCH FOR

USE IN EMERGENCY SYSTEMS

Model Number: Z3003S1AA50XXXXXXX Serial Number: 1598248-2 BOM Number: ZB1SD20031-05A600X

RATING

Volts: 480 Hz: 60 Amps: 2000 Phase: 03

LISTED

382H

E23911

CAUTION

Due to hazardous voltages and currents, ABB recommends that an ABB Certified technician or a qualified electrician perform the installation and maintenance of the switch.

WARNING

All power sources must be disconnected before manual operation of the switch.

Electrical Testing of the Switch (Source 1 = utility, Source 2 = generator) To verify the electrical system and proper automatic operation of the switch, perform the following steps:

CHECKING SOURCE 1 (PREFERRED SOURCE)

1. Check to make sure the switch is connected to

Source 1 position.

2. Turn the Disconnect Switch (DS) to INHIBIT. This prevents the switch from transferring or sending a start signal to the Source 2 generator unintentionally.

3. Verify that the switch rating is the same as the system voltage from Source 1 supply power.

The equipment rating nameplate on the transfer switch lists the voltage (see Figure 4).

4. Close the Source 1 input circuit breaker.

5. Confirm that the MX350 controller is sensing

Source 1 voltage. The S1 LED should be illuminated.

Electrical parameters (including phase rotation) can be viewed on the MX350 Graphical Control Panel on the \Value\Summary and \Diag\Phasor screens. Verify that the system voltage is correct for the rating of the switch.

CHECKING SOURCE 2 (NON-PREFERRED OR

ALTERNATE SOURCE)

6. Close the Source 2 input circuit breaker.

7. Manually start Source 2 via controls on the generator itself. Note that with the DS in INHIBIT position, the generator cannot be started by the MX350 controller.

8. Confirm that the MX350 controller is sensing Source 2 voltage. The S2 LED should be illuminated.

Electrical parameters (including phase rotation) can be viewed on the Graphical Control Panel on the \Value\Summary and \Diag\Phasor screens.

9. Verify that the phase rotation of Source 1 is the same as the phase rotation of Source 2.

10. Manually shut down the generator via controls on the generator itself.

CAUTION

Energizing a transfer switch with dissimilar system voltage from that which the ATS is rated may cause equipment damage.

ABB Zenith Page 6 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

CHECKING THE SWITCH’S ABILITY TO TRANSFER

11. Turn the DS to AUTO position. This allows the MX350 controller to send a start signal to the generator.

12. Perform a System Test. The options available are

(a) Fast Test (test with load without time delays),

(b) Xfer Load and (c) No Xfer (test without load, gen-erator start only). The test(s) can be initiated by the green TEST button on the Graphical Control Panel.

13. After completing electrical tests, close and lock the enclosure, including all small quarter-turn locks on the enclosure door.

Electrical testing of the switch is further discussed in the manual MX350 Automatic Transfer Control System (Publication Number 1601-9071-A1).

The Control Connections

The ZTE and ZBTE lines of transfer switches are designed for maximum flexibility and ease of installation. As illustrated in Figure 2, the MX350 controller input/output and metering modules, graphical control panel and power supplies are mounted on the enclosure door. All terminal connec-tions for the engine start, switch position contacts, input and output relays are typically just inside the cabinet on the right side for ease of accessibility. Configurable input and output relays are PCB board mounted on DIN rail in combinational arrays of 5 inputs and 7 outputs. A “Field Connection Diagram” (see the example in Figure

5) is affixed on the cover of the universal transformer assembly (UTA) power supply for easy reference. This diagram provides the factory-supplied terminal board connections as well as dry contact inputs and outputs identified by terminal number as defined in the MX350 controller. The terminal board and I/O connections are schematically shown in Figure 3. Close-up photographs of an input and output PCB with terminal connections are shown in Figures 6 and 7.

The number of PCB-mounted input and output relay assemblies equals the number of “L cards” on the microcontroller, more formally termed “IO_L modules.”

The assembly of output relays is ABB part number 50P-3042.

The input relay assembly is ABB part number 50P-3041. If the microcontroller has one L card, then there will be one pair of ABB Part Number 50P-3041 and 50P-3042 PCB combinations mounted on the DIN rail inside the enclosure.

For two L cards, there will be two sets of input and output strips. The maximum combination is three pairs of I/O strips (that is, a total of six relay DIN rail mounted PCBs).

The controller automatically recognizes the physical location of the input or output relays via an alpha-numeric identification system. The first set of output relays are named G1 through G5 while the input relays are identified as G7 through G13. If a second L card exists in the micro-controller, the second PCB-mounted assembly output relays are named H1 through H5; the outputs are H7 through H13. Similarly, a third IO_L module is related to inputs I1 through I5 and outputs I7 through I13 (see Table 4).

CAUTION

Certain accessories, per specific schematics, can inhibit automatic transfer. Engine Genset could start when engine control wires are attached.

NOTE

A periodic test of the transfer switch under load conditions is recommended to insure proper operation.

(See National Electric Code articles 700 and 701)

Terminal Terminal Terminal Type G1 H1 I1 Output G2 H2 I2 Output G3 H3 I3 Output G4 H4 I4 Output G5 H5 I5 Output G6 H6 I6 Common for outputs G7 H7 I7 Input G8 H8 I8 Input G9 H9 I9 Input G10 H10 I10 Input G11 H11 I11 Input G12 H12 I12 Input G13 H13 I13 Input G14 H14 I14 Common for inputs

Table 4 IO_L Module Connections

Terminals G7 and G8 are always used for DS and Q2 functions, respectively, and cannot be adjusted. Depending on the type of switch and features ordered, Terminals G1 through G5 as well as G9 through G13 may not be available for customer configuration. See electrical schematic.

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 7 ABB Zenith

Figure 5 Example of Field Connection Diagram

Notes: 1. See Field connection wiring diagram for additional wiring details.

2. Controller inputs and outputs are field reconfigurable. “Factory Settings: indicate configuration at time of shipment.

3. From MX350 Display, go to \HOME\INPUTS or \HOME\OUTPUTS to see current configuration.

4. Record user configuration in “Field Setting” area below.

Name Term # Description

TB Strip 15 Connected to Source 1 (NO)

14 Connected to Source 1 (Common)

13 Connected to Source 1 (NO)

12 Connected to Source 1 (Common)

11 Connected to Source 2 (NO)

10 Connected to Source 2 (Common)

9 Connected to Source 2 (NO)

8 Connected to Source 2 (Common)

3 Engine Start – NC

2 Engine Start – Common

1 Engine Start – NO

G Input Strip

G 7 Disconnect Switch (DS) Factory Use Only

G 8 Test with Load (Q2) Factory Use Only

G 9 Load Shed from S2 (R15) Factory Use Only

G 10 Bypass Xfer Time Delay to S1

G 11 Inhibit Xfer to S2 (Q3)

G 12 Inhibit Xfer to S1 (Q7)

G 13 Engine Start (SW1)

Com +24VDC Factory Use Only

Name Term # Factory Setting Field Setting

G Output Strip

G 1 (NO/NC/

Common) Load Shed from S2 (R15) Factory Use

Only

G 2 (NO/NC/

Common) Alternative Source Fail to Start

G 3 (NO/NC/

Common) S1 Failure

G 4 (NO/NC/

Common) S2 Failure to Connect

G 5 (NO/NC/

Common) Load Control 1

Name Term # Description

TB Strip 12 Connected to Source 1 (NO)

11 Connected to Source 1 (Common)

10 Connected to Source 1 (NO)

9 Connected to Source 1 (Common)

8 Connected to Source 2 (NO)

7 Connected to Source 2 (Common)

6 Connected to Source 2 (NO)

5 Connected to Source 2 (Common)

4 Bypass in Source 1 (NO)

3 Bypass in Source 1 (Common)

2 Bypass in Source 2 (NO)

1 Bypass in Source 2 (Common)

3 Engine Start – NC

2 Engine Start – Common

1 Engine Start – NO

Non-Bypass ATS Bypass ATS

Input 7 Position 1

Input 8 Position 2

Input 9 Position 3

Input 10 Position 4

Input 11 Position 5

Input 12 Position 6

Input 13 Position 7

Common Position 8

Common Position 9

Common Position 10

ABB Zenith Page 8 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Output 1

1 = NO

2 = NC

3 = common

Output 2

4 = NO

5 = NC

6 = common

Output 3

7 = NO

8 = NC

9 = common

Output 4

10 = NO

11 = NC

12 = common

Output 5

13 = NO

14 = NC

15 = common

Figure 7 Input Strip and Connections (ABB Part Number 50P-3041)

Figure 6 Output Strip and Connections (ABB Part Number 50P-3042)

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 9 ABB Zenith

Figure 8 MX350 Graphical Display Components

The MX350 Controller

The MX350 microcontroller is a modular control and monitoring system designed specifically for low-voltage transfer switch applications. The MX350 provides the following key benefits:

• Flexible control and communication options to suit any low-voltage transfer switch application.

• Small footprint.

• Modular design, which reduces the number of spare components for maintenance and testing.

• Integrated pushbuttons and LED indicators which reduce required external components and wiring

• Multiple communication protocols which permit simple integration into monitoring and control systems.

• A graphical control panel that provides local control and access to system information.

Detailed technical information on the MX350 controller is described in the manual MX350 Automatic Transfer Control System (Publication Number 1601-9071-A1).

The MX350 Graphical Display and Keypad The MX350 controller features a ¼ VGA color graphical display with status LEDs, an USB programming port and menu-driven soft keys (see Figure 8) as well as dedicated control and navigational keys. Each display page, in turn, consists of three components: (1) a header bar,

(2) the selected page and (3) soft-key labels (Figure 8).

The header bar displays the hierarchical path name, the date and time and the current password access level.

The soft-key labels are indicated on the bottom line.

Soft-keys are used for navigation, performing functions and for acknowledgement transactions. Soft-keys labels change to show relevant selections for the displayed screen. The color of each soft-key label indicates its functionality. Soft-keys are highlighted for the displayed page, unauthorized keys are “greyed-out”, and unused keys are not displayed.

The control panel LEDs summarize the status of the transfer switch, including the following indications:

• ALARM: indicates that there is a problem with the ATS or that a user configurable alarm condition is active.

• TD DELAY: indicates that the controller is timing before taking the next control action.

• XFER INHIBIT: indicates that the controller will not automatically transfer to the other source and that operator intervention is required to allow transfer.

• S1 (Source 1) Available LED: indicates that S1 power is present and within user defined limits.

• S2 (Source 2) Available LED: indicates that S2 power is present and within user defined limits.

• S1 (Source 1) Status LED: indicates that the load is connected to S1 power.

• S2 (Source 2) Status LED: indicates that the load is connected to S2 power.

The MX350 controller page hierarchy is shown in Figure 9.

Operation Setpoints and User-Configurable Inputs and Outputs Operation setpoints define the acceptable electrical and time limits for both Source 1 and Source 2. These set-points define dropout and restore values for over and undervoltage, over and under frequency, as well as the associated time delays. Tables 7 and 8 provide typical parameter settings for operation setpoints and timers.

ABB Zenith Page 10 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Figure 9 MX350 Graphical Display Page Hierarchy

Amps

Power

Volts

PQ

Values

Inputs

Outputs

System

Message

Flex

Summary

Status Reset

Operation

Control

Security

ConfigSetpoints

Phase B

Phase C

Phase A

Phase A

Phase B

Phase C

Phase A

Phase B

Outputs

Comms

System

Events

Zenith

Waveform

Faults

Alarms

Control

Stats

Phasors

About

Events

Report

Diag

ATS

CT-VT

Inputs

Virtual

Waveform

Datalog

Phase C

V1 Harm

V2 Harm

I Harm

Summary

V1 Harm

V2 Harm

I Harm

Summary

V Inputs

V Outputs

S1 Setting

S2 Setting

Timers

General

Interlock

Alarms

Reset

Setup

Main menu Level 3Level 2Level 1

ExerCancel

InfoExerciser

Datalog

Test

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 11 ABB Zenith

Switch Exerciser The MX350 controller has a built-in exerciser that can be enabled and set up from the \Exerciser\Info screen.

This feature allows the user to test the system periodi-cally or to setup a schedule for operating the system periodically in order to minimize utility costs.

From the \Exerciser\Info screen the operator can access all required setup parameters for scheduling exercises.

It also indicates as to when the last exercise took place and when the next exercise will be performed.

The \Home\Exerciser\Setup page displays the MX350 Exerciser parameters as shown in Figure 10. Exercise type and schedule are user-defined here for starting time, duration of exercise and whether or not the switch is to transfer the load. The mode of operation of the exerciser function can be selected with a time base of 1 day, 1 week, 14 days, 28 days, or 365 days. With a time base of 365 days, up to 24 events can be scheduled. With all other time bases, the number of exercise events is limited to 7.

Figure 10 Exerciser Values on Home\Exerciser\Setup Page

For each exercising event, the operator enters a start time as well as a time of duration. In addition, the operator can select the type of exercise as ‘Genstart and Transfer’ or as ‘Genstart only’. When the ‘Gen Start only’ mode is selected, the controller will start the engine, but does not actually transfer the load. In this mode, the readiness for the engine generator set is tested. It does not test the functionality of the Automatic Transfer Switch itself. In the ‘Gen Start and Transfer’ mode, the controller starts the engine and actually transfers the load to the alter-native source. This mode can be used to test the integrity of the emergency power system. It can also be used to setup a schedule for times of operation when the switch load will run on an alternative power supply. This could be done, e.g., to avoid demand charges from a utility company. If the operator chooses to abort an ongoing test, there is a ‘Test Cancel’ button on the \Exerciser\Info screen. This screen also contains a ‘Test’ button that will take the user directly to the Test screen.

The \Home\Exerciser\Test page displays the MX350 system test choices, as shown in Figure 11. From the Test screen the user can perform the same operations as performed by the exerciser. Whereas exercises are performed automatically, a Test always has to be initiated by the user.

Figure 11 System Test Choices on Home\Exerciser\Test Page

There are three types of tests: Fast Test, Xfer Load, and No Xfer. The screen also provides an END button to abort any of the three test types. To test the functionality of the switch the operator can use the Fast Test option.

With this kind of test, the engine generator will start and the load will transfer without going through any time delays. In order to simulate a load transfer as if an outage was occurring, the operator can select the Xfer Load test. With this test type, the engine will start up and the load will transfer according the time delay of the W timer. When the test is ended (by depressing the END button), the switch will go through the U timer delay before actually transferring back to the utility.

Controller power supply (UTA – universal transformer assembly)

System line voltage is transformed to 170Vdc to power the MX350 controller and 24Vdc ungrounded to power relays via the universal transformer assembly (UTA).

The power supply is termed “universal” because the same unit handles all line voltages from 120Vac through 600Vac via an internal six-position jumper array. Figure 12 shows the external connections points for the UTA. The UTA also features a 120Vac uninterruptible power supply input and 24Vdc input battery options. 120Vac and 24Vdc (ungrounded) must be supplied together from an uninterrupted power source. In addition, test terminals are included for transformer voltage monitoring (see Figure 13 for connection point definitions and Figure 14 for the UTA schematic).

ABB Zenith Page 12 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Figure 12 Connection Points for Universal Transformer Assembly (UTA)

Figure 13 Connection Points on Test Plug for Universal Transformer Assembly (UTA)

120VAC Aux Input (customer supplied) (not obligatory)

(See Note 1)

24VDC output from UTA to I/O relays

170VDC output from UTA to MX350 controller

Source 1 voltage input

Test points

Source 2 voltage input

24VDC Aux Input (ungrounded) (customer supplied) (not obligatory)

(See Note 1)

Plug position

Test point Plug position

Test point

TP1

19 18

TP3

17 16

TP5

15 14

TP7

13 12

TP9

10 9

TP2

8 7

TP4

6 5

TP6

4 3

TP8

2 1

TP10

Plug position Test point Test Connection Points Value Measured

1 TP10 TP1-TP2 Line AC voltage input from Source 1 2 — TP2-TP3 Voltage drop across R1 3 TP8 TP4-TP5 24 VAC to output from Source 1 to input/output relays 4 — TP6-TP7 Line AC voltage input from Source 2 5 TP6 TP7-TP8 Voltage drop across R2 6 — TP9-TP10 24 VAC to output from Source 2 to input/output relays

7 TP4

8 —

9 TP2

10 — 11 —

12 TP9

13 —

14 TP7

15 —

16 TP5

17 —

18 TP3

19 —

20 TP1

View looking into plug

UTA

metal cover

UTA PC board

Note 1: Both Aux inputs must be supplied from an uninterrupted power source. Supplying only one Aux input may result in malfunction.

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 13 ABB Zenith

Figure 14 Universal Transformer Box Assembly (UTA) Schematic

V_A R5

I/O’S

CUSTOMER

UPS (120VAC)

OPTIONAL FOR KEEPING

THE MX350 CPU ACTIVE

WITH LOSS OF SOURCE 1

OR SOURCE 2 POWER

(SEE NOTE 1)

FROM

FROM

TO MX350

CONTROLLER

CONTROLLER

TO MX350

POWER SUPPLY (PS)

D18

D19

D20

OPTIONAL FOR KEEPING THE INPUT AND OUTPUT STRIPS ACTIVE WITH

LOSS OF SOURCE 1 OR SOURCE 2 POWER (SEE NOTE 1)

NOTE 1: MUST BE SUPPLIED TOGETHER FROM AN UNINTERRUPTED POWER SOURCE

FROM

CUSTOMER

BATTERY

(24VDC)

(UNGROUNDED)

J4

170+

170-

J9

J12

MOV3

V_B

D26

D22

D23

D24

TROUBLESHOOTING

FOR SERVICE

TEST POINTS

REFER TO

ELECTRICAL

SCHEMATIC DWG.

SHEET 4

D17

TO TP10

J6

TO TP9

TO TP8

TO TP6

TO TP7

TO TP5

TO TP4

TO TP3

J3

Source 1 AC Voltage

Source 2 AC Voltage

J1

J2

V_A

V_B

TO TP2

TO TP1

V_B

V_A

TP3

TP4

TP5

TP6

TP7

TP6

TP8

TP7

TP8

TP9

TP10

17VDC

D21

17VDC

120VAC

120VAC

JP1

JP2

JP3

TP1

TP1

TP3

TP2

TP2

120VAC

120VAC

MOV2

MOV1

JP4

JP5

JP6

R4

R3

C1 MOV5

TP6

C2

R2

MOV4

D13

D14

D16

D8

D12

D4

D9

D10

T2

31 10 12

T1

~R1

TP10

TP1

TP7

TP9

D25

TP8

D6

D5

D8

D7

D4

D3

D2

D1

TP5

TP2

TP4

D25

TP3

ABB Zenith Page 14 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Sequence of Operation

Automatic transfer switches transition from one source to a second source in three different ways: standard (also referred to as open), delayed and closed transition.

Delayed transition switches have an intermediary mid-point location where the switch is not connected to either source when transferring to the non-preferred source after a preferred source failure. For closed transition, both sources are connected momentarily. Timers are utilized to insure that sources are stable before transferring or to prevent a hurried, ultimately unnecessary transfer when the apparently failed source was actually not in a state of failure.

When transferring with two good sources (either a retransfer back to Source 1 or a system test transfer), closed transition switches are momentarily connected to both sources for a period of less than 100 ms. The controller prevents transfer until Source 2 is in electrical synchronism with the utility.

Sequence of Operation for Bypass/Isolation Transfer Switch

An automatic transfer switch equipped with a bypass/ isolation switch provides the ability to withdraw the automatic transfer switch for testing and/or maintenance purposes without interrupting the served load. The bypass manual switch is the upper power panel while the automatic switch is housed in the lower panel (see Mimic Bus and Indicator Lights Schematic in Figure 15).

Operation of the unit is quick and convenient, requiring only one operator and less than one minute to complete.

Instructions are mounted on the front of each isolation switch door along with a mimic panel providing indication of power source availability and bypass/ATS switch positions.

The manual bypass switch is normally open on both sources with the ATS feeding the system load. During operation, the bypass switch is closed, paralleling the ATS contacts which then allows withdrawal of the ATS to the TEST or ISOLATE position. Mechanical and electrical interlocks are included to prevent cross-sourcing or bypassing to a dead source.

In the TEST position, the ATS is disconnected from the load (which is instead powered through the bypass panel). However, control power is available to the ATS to permit operational testing through the control panel of the transfer switch while removed from Source 1 and Source 2.

In the ISOLATE position, the ATS is completely withdrawn and may be removed from the enclosure, if desired, for maintenance.

After the isolation operation, if the bypass is closed into Source 1 and this source happens to fail, an auxiliary contact on the bypass control will automatically start the alternate generator source (Source 2). The manual handle of the bypass may then be operated to transfer the load to Source 2. Interlocks guard against inadvertent manual connection to an opposite source if the ATS is in the circuit. Also, the reconnection of the ATS is prevented via interlocks if the source positions don’t match.

Comparative sequences of operation for bypass/isolation transfer switch as a function of rated amperage are shown in Figure 16.

Figure 15 Bypass/Isolation Transfer Switch Mimic Bus and Indicator Lights Schematic

WARNING

While the bypass switch is out of the AUTO position/mode, the ATS is INHIBITED from automatic operation. Make certain the

ATS is left in automatic after completion of any service.

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 15 ABB Zenith

Ve rt ic al

Ve rt ic al

H or iz on ta l

Ve rt ic al

H or iz on ta l

Ve rt ic al

0-

0A

0-

A

-3

0A

A Sw it ch

P os iti on

Sw it ch P os iti on 1.

Co nf ig ur at io n fo r

Au to m at ic O pe ra tio n

M an ua lly o pe ra te d

By pa ss S w itc h co nt ac ts (B

N /B

E) a re o pe n

AT

S is s up pl yi ng lo ad

D is co nn ec t s w itc h (D

S) is in A

U

TO

M an ua lly o pe ra te d

By pa ss S w itc h co nt ac ts (B

N /B

E) a re o pe n

AT

S is s up pl yi ng lo ad

D is co nn ec t s w itc h (D

S) is in A

U

TO

M an ua lly o pe ra te d

By pa ss S w itc h co nt ac ts (B

N /B

E) a re o pe n an d

AT

S is s up pl yi ng lo ad

D is co nn ec t S w itc h

(D S) is in

A ut o

M an ua lly o pe ra te d

By pa ss S w itc h co nt ac ts (B

N /B

E) a re o pe n

AT

S is s up pl yi ng lo ad

D is co nn ec t s w itc h (D

S) is in A

U

TO

2.

To B yp as s

AT

S

O pe n bo tt om c ab in et d oo r

Tu rn D is co nn ec t S w itc h

(D S) to

IN

H

IB

IT

Po si tio n m an ua l b yp as s ha nd le (M

BH

to s am e po w er s ou rc e at

A

TS

O pe n bo tt om c ab in et d oo r

Tu rn D is co nn ec t S w itc h

(D S) to

IN

H

IB

IT

Tu rn

B yp as s

Se le ct or

S w itc h

(B

SS

) t o sa m e po w er s ou rc e as A

TS

Tu rn D

S to

In hi bi t

O pe n

By pa ss Is ol at io n

Ac ce ss p an el

Tu rn B yp as s Se le ct or S w itc h (B

SS

) t o sa m e po w er s ou rc e as

A

TS

Po si tio n M an ua l B yp as s

H an dl e

(M

BH

) u pw ar d

O pe n bo tt om c ab in et d oo r

Tu rn D is co nn ec t S w itc h

(D S) to

IN

H

IB

IT

Po si tio n m an ua l b yp as s ha nd le

(M

BH

up w ar d

3.

T es t

AT

S

By pa ss p er in st ru ct io n ab ov e

M ov e

AT

S lo ca tio n ha nd le

(A

LH

to

T

ES

T lo ca tio n

Tu rn

D S to A

U

TO

Te st s w itc h (T

S) o n bo tt om ca bi ne t d oo r w ill a llo w el ec tr ic al o pe ra tio n of

A

TS

By pa ss p er in st ru ct io n ab ov e

Ro ta te c ra nk m ec ha ni sm c ou nt er -c lo ck w is e un til A

TS

T

ES

T lig ht is il lu m in at ed

Tu rn

D S to A

U

TO

Te st s w itc h (T

S) o n bo tt om c ab in et d oo r w ill a llo w e le ct ric al o pe ra tio n of A

TS

By pa ss p er a bo ve in st ru ct io ns

Ro ta te c ra nk m ec ha ni sm c ou nt er -c lo ck w is e un til

A

TS

T

ES

T lig ht is il lu m in at ed

Tu rn D

S to

A ut o

Te st

S w itc h

(T S) o n m ic ro pr oc es so r co nt ro lle r w ill a llo w e le ct ric al op er at io n of

A

TS

By pa ss p er in st ru ct io n ab ov e

Ro ta te c ra nk m ec ha ni sm c ou nt er -c lo ck w is e un til

A

TS

T

ES

T lig ht is il lu m in at ed

Tu rn D

S to

A U

TO

Te st s w itc h

(T S) o n bo tt om c ab in et d oo r w ill a llo w e le ct ric al o pe ra tio n of

A

TS

4.

Is ol at e

AT

S

By pa ss p er in st ru ct io n ab ov e

M ov e

AT

S lo ca tio n ha nd le

(A

LH

to

IS

O

LA

TE

p os iti on

By pa ss p er in st ru ct io n ab ov e

Ro ta te c ra nk m ec ha ni sm c ou nt er -c lo ck w is e un til A

TS

IS

O

LA

TE

D li gh t i s ill um in at ed

(S ee

F ig ur e

By pa ss p er a bo ve in st ru ct io ns

Ro ta te c ra nk m ec ha ni sm c ou nt er cl oc kw is e un til A

IS

O

LA

TE

D li gh t i s ill um in at ed

By pa ss p er in st ru ct io n ab ov e

Ro ta te c ra nk m ec ha ni sm c ou nt er cl oc kw is e un til A

TS

IS

O

LA

TE

D li gh t is il lu m in at ed

(S ee

F ig ur e

5.

R em ov e

AT

S

By pa ss p er in st ru ct io n an d is ol at e pe r ab ov e

M ov e

AT

S lo ca tio n ha nd le

(A

LH

to

R

EL

EA

SE

p os iti on

D is co nn ec t m ul tip in p lu gs

Li ft

A

TS

o ut o f d ra w er

By pa ss p er in st ru ct io n

#2 a nd is ol at e pe r # ab ov e

D is co nn ec t m ul tip in p lu gs e xt er na l co nn ec tio ns to

A

TS

Ro ta te fo ur

(4 ) p ow er p an el la tc he s to v er tic al po si tio n, s lid e

AT

S fo rw ar d lo ck m ec ha ni sm in p la ce

Re m ov e

AT

S fr om c ab in et

By pa ss a nd is ol at e pe r ab ov e in st ru ct io ns

O pe n Au to m at ic

T ra ns fe r Sw itc h ac ce ss p an el

Sl id e fo ur c or ne r la tc he s of A

TS

to in ne rm os t p os iti on

AT

S ca n no w b e re m ov ed fr om c ab in et

By pa ss p er in st ru ct io n an d is ol at e pe r ab ov e

D is co nn ec t m ul tip in p lu gs e xt er na l co nn ec tio ns to

A

TS

Sl id e fo r

(4 ) c or ne r la tc he s of

A

TS

to in ne rm os t p os iti on

Re m ov e

AT

S fr om c ab in et

6.

R ec on ne ct

AT

S

Af te r Re m ov al

Pl ac e

AT

S in to d ra w er s lo ts

(fr on t r ol le rs fi rs t)

Tu rn

D is co nn ec t S w itc h (D

S) to

IN

H

IB

IT

M an ua lly p os iti on A

TS

in to s am e so ur ce a s by pa ss s w itc h

Re co nn ec t m ul tip in p lu gs e xt er na l co nn ec tio ns to

A

TS

Pu sh A

TS

in w ar d to e ng ag e ca rr ia ge

M ov e

AT

S lo ca tio n ha nd le (A

LH

) t o

TE

ST

lo ca tio n (a s in di ca te d by li gh t)

Tu rn D is co nn ec t S w itc h

(D

AU

TO

u se T es t S w itc h (T tr ic al ly o pe ra te A

TS

Tu rn

D is co nn ec t S w itc h (D

S) to

IN

H

IB

IT

M ov e

AT

S lo ca tio n ha nd le (A

LH

) t o

AU

TO

lo ca tio n

Tu rn

D S to A

U

TO

o pe n by pa ss w ith

M

BH

AT

S is n ow fu lly a ut om at ic

Pl ac e

AT

S in s lid e m ec ha ni sm

U nl oc k sl id e m ec ha ni sm

Sl id e

AT

S ov er p ow er p an el la tc he s ro ta te la tc he s to h or iz on ta l p os iti on

Tu rn

D is co nn ec t S w itc h (D

S) to

IN

H

IB

IT

M an ua lly p os iti on A

TS

in to s am e so ur ce a s by pa ss s w itc h

Re co nn ec t m ul tip in p lu gs e xt er na l co nn ec tio ns to

A

TS

Ro ta te c ra nk m ec ha ni sm c lo ck w is e un til

AT

S

TE

ST

li gh t i s ill um in at ed

(S ee

F ig ur e

Tu rn D is co nn ec t S w itc h

(D S) to A

U

TO

u se

Te st

S w itc h

(T S) to e le ct ric al ly o pe ra te A

TS

Tu rn

D is co nn ec t S w itc h (D

S) to

IN

H

IB

IT

Ro ta te c ra nk m ec ha ni sm c lo ck w is e un til

A ca tio n po in te r i s al ig ne d w ith

A U

TO

m ar k on lo ca tio n in di ca to r.

(A

TS

m us t b e in s am e so ur ce a s by pa ss

Tu rn

D S to A

U

TO

o pe n by pa ss w ith m an ua l by pa ss h an dl e

(M

BH

AT

S is n ow fu lly a ut om at ic

Ro ll ca rt b ac k in to c ab in et

Sl id e fo ur c or ne r la tc he s of to o ut er m os t p os iti on

Tu rn D

S to

In hi bi t

M an ua lly p os iti on A

TS

sa m e so ur ce a s

By pa ss S w itc h

C lo se A ut om at ic

T ra ns fe r Sw itc h ac ce ss p an el

Ro ta te c ra nk m ec ha ni sm c lo ck w is e un til

A

TS

T es t l ig ht is il lu m in at ed

Tu rn D

S to

A ut o an d us e tr ic al ly o pe ra te

A

TS

Tu rn D

S to

In hi bi t

Ro ta te c ra nk m ec ha ni sm c lo ck w is e un til

A

TS

lo ca tio n po in te r i s al ig ne d w ith A ut o m ar k on lo ca tio n in di ca to r.

(A

TS

m us t b e in s am e so ur ce a s

By pa ss

Tu rn D

S to

A ut o an d op en

By pa ss w ith M

BH

AT

S is n ow fu lly a ut om at ic

Ro ll

AT

S ca rt b ac k in to c ab in et

Sl id e fo ur

(4 ) c or ne r la tc he s of

A

TS

to ou te rm os t p os iti on

Tu rn

D is co nn ec t S w itc h (D

S) to

IN

H

IB

IT

M an ua lly p os iti on A

TS

in to s am e so ur ce as b yp as s sw itc h

Re co nn ec t m ul tip in p lu gs e xt er na l co nn ec tio ns to A

TS

Ro ta te c ra nk m ec ha ni sm c lo ck w is e un til

AT

S

TE

ST

li gh t i s illu m in at ed

(S ee

F ig ur e

Tu rn D is co nn ec t S w itc h

(D S) to A

U

TO

u se Te st S w itc h (T

S) to e le ct ric al ly o pe ra te

A

TS

Tu rn D is co nn ec t S w itc h

(D S) to

IN

H

IB

IT

Ro ta te c ra nk m ec ha ni sm c lo ck w is e un til

AT

S lo ca tio n po in te r i s al ig ne d w ith

A U

TO

m ar k on lo ca tio n in di ca to r.

(A

TS

m us t b e in s am e so ur ce a s by pa ss

Tu rn

D S to A

U

TO

o pe n by pa ss w ith m an ua l b yp as s ha nd le (M

BH

AT

S is n ow fu lly a ut om at ic

7.

O pe ra te th e

By pa ss Sw it ch

W he n th e

AT

S is in

TE

ST

o r

IS

O

LA

TE

M ov e th e m an ua l b yp as s ha nd le

(M

BH

) t o th e av ai la bl e po w er s ou rc e

(1

) M ov e m an ua l b yp as s ha nd le (M

BH

) d ow nw ar d to o pe n th e by pa ss p ow er p an el c on ta ct s, (2

) t ur n th e by pa ss s el ec to r sw itc h

(B

SS

) t o th e op po si te p ow er s ou rc e, a nd

(3

) m ov e th e M

BH

u pw ar d to c lo se in to th e se le ct ed p ow er s ou rc e

(1

) M ov e m an ua l b yp as s ha nd le (M

BH

) d ow nw ar d to o pe n th e by pa ss p ow er p an el c on ta ct s, (2 ) t ur n th e by pa ss s el ec to r s w itc h (B

SS

to th e op po si te p ow er s ou rc e, ) m ov e th e

M

BH

u pw ar d to c th e se le ct ed p ow er s ou rc e

(1

) M ov e m an ua l b yp as s ha nd le (M

BH

do w nw ar d to o pe n th e by pa ss p ow er pa ne l c on ta ct s, (2 ) t ur n th e by pa ss s el ec to r sw itc h (B

SS

to th e op po si te p ow er s ou rc e, ) m ov e th e

M

BH

u pw ar d to c th e se le ct ed p ow er s ou rc e

N ot es

D is co nn ec t S w itc h

(D S) in

IN

H

IB

IT

p re ve nt s th e el ec tr ic al o pe ra tio n of th e

AT

S.

D o no t u se e xc es si ve fo rc e on m ec ha ni ca l h an dl es

Fi gu re s de pi ct b yp as s op er at io ns r el at iv e to S ou rc e 1.

S eq ue nc es a re th e sa m e fo r by pa ss o pe ra tio ns r el at iv e to

S ou rc e

2.

W he n

AT

S is in T

ES

T or

IS

O

LA

TE

, t he b yp as s sw itc h op er at es a s a m an ua l t ra ns fe r sw itc h to e ith er a va ila bl e so ur ce

, w hi ch is in di ca te d on th e lig ht p an el

Se e

Fi gu re

5)

FI

G

. 1

P

IS

O

PE

N

W

IT

H A

TS

IN

S O

U

RC

E

AT

S

BN BE

SO

U

R C

E

LO

AD

SO

U

R C

E

FI

. 2

BP

IN

S O

U

RC

E

W

IT

H A

TS

IN

S O

U

RC

E

AT

S

BN BE

SO

U

RC

E

LO

AD

SO

U R

C E

FI

. 3

IN

S

O U

R C

E

W

IT

H A

TS

IN

T

ES

T

LO

AD

C O

N N

EC

TI

O N

S

AR

E O

PE

N

AT

S

BN BE

SO

U

RC

E

LO

AD

SO

U

RC

E

FI

. 4

IN

S

O U

RC

E

W

IT

H

A

TS

IS

O

LA

TE

D

BN BE

SO

U

RC

E

LO

AD

SO

U

RC

E

Figure 16 Sequence of Operation for Bypass/Isolation Switches

ABB Zenith Page 16 Zenith ZTE/ZBTE Series Operation & Maintenance Manual

Symptom Possible Cause(s) Corrective Action

Engine does not start

Engine start wires not terminated properly Check engine start connections

Generator is in OFF position Investigate why Engine Control Switch was turned off

Engine does not stop

U timing cycle not complete Check U timer setting

Engine start wires not terminated properly Check engine start connections

Generator in MANUAL Place generator in AUTO

Source 1 not within proper parameters Check Source 1 voltage, frequency values, and Source 1 circuit breaker

ATS will not transfer to Source 2

Mechanical or electrical connections problem Check all connections to SCR modules, check DS for proper operation & wire connections, check limit switches for proper operation

Remote active inhibit signal Check for remote inhibit signal

Source 2 voltage or frequency not with acceptable parameters

Check engine start connections, generator breaker, generator output & engine control switch

Power supply connector unplugged Plug in connector

W timing cycle not complete Check W timer setting

ATS will not transfer to Source 1

Mechanical or electrical connections problem Check all connections to SCR modules, check DS for proper operation & wire connections, check limit switches for proper operation

Remote inhibit active Check for remote inhibit signal

DW timing cycle not complete Check DW timer setting

Source 1 voltage or frequency not within acceptable parameters Check utility & utility breakers

Power supply connector unplugged Plug in connector

T timing cycle not complete Check T timer setting

DANGER

HAZARDOUS VOLTAGE CAN CAUSE

SEVERE INJURY OR DEATH

Turn OFF all power before installation, adjustment or removal of transfer switch or any of its components.

Troubleshooting & Diagnostics

The following troubleshooting guide may be used to recognize and determine basic faults.

If you go through all of the suspected faults and still require assistance, call an ABB technical representative.

Table 5 Basic Troubleshooting Guide for Automatic Transfer Switches

Zenith ZTE/ZBTE Series Operation & Maintenance Manual Page 17 ABB Zenith

Maintenance and Testing

A preventive maintenance program will insure high relia-bility and long life for the transfer switch. A preventive maintenance program should including the following:

Inspection and Cleaning The switch should be inspected for any accumulation of dust, dirt or moisture and should be cleaned by vacu-uming or wiping with a dry cloth or soft brush. Do not use a blower since debris may become lodged in the electrical and mechanical components of the switch and can potentially cause damage.

Remove the transfer switch barriers and check the condition of the contacts. Any surface deposits must be removed with a clean cloth (do not use emery cloth or a file). Pitted or excessively worn contacts should be replaced. General inspection of the general mechanical integrity of the switch should be made to identify and correct loose, broken or badly worn parts.

Servicing All worn or inoperative parts must be replaced using genuine ABB recommended replacement parts. Contact ABB Technical Services for replacement parts information.

The operating mechanism of the transfer switch is lubricated with Lubriplate 105. The lubricant applied at the factory will provide adequate lubrication for the lifetime of the switch. Should debris contaminate the mechanism, clean and apply additional Lubriplate.

ABB can provide complete preventative maintenance services. For additional information contact ABB Technical Services at + - or + -.

Electrical testing of the switch is discussed in the “Testing” section of this manual. A periodic test of the transfer switch under load conditions is recommended to insure proper operation. (See National Electric Code articles 700 and 701)

CAUTION

Due to hazardous voltages and currents, ABB recommends that an ABB Certified technician or a qualified electrician perform the installation and maintenance of the switch.

Extensive Customer Service and Support Supported by a worldwide network of factory-trained Authorized Service Centers, our Technical Service Representatives can provide you with field service, equipment parts and preventive maintenance.

Because emergency power systems are required to operate under the most adverse circumstances, site personnel may be called upon at any time to make decisions regarding the operation of the system, therefore training of these personnel is critical to the future of any installation.

ABBoffers a variety of training options including on-site classes for project personnel, factory instruction on your equipment prior to shipment and service schools covering transfer switches and switchgear systems.

Product Overview When you purchase emergency power equipment, reliability and quality are a necessity. ABB is committed to providing the highest level of quality demanded by the industry. Our complete product line will allow you to specify a total power management system while maintaining overall compatibility and the most comprehensive warranty in the industry.

Commitment to the Customer All team members at ABB are aware of the critical situations in which our products are called upon to perform. With that understanding comes an obligation beyond merely fulfilling an order or turning out a product.

Serving that obligation is our mission at ABB.

ABB’s team works with you from the first phone call through completed start-up. Then, working hand in hand with the consulting engineer, the contractor and the facility owner/operator, we’ll ensure that the system fulfills both current and future needs.

“Commitment to our customer” has been ABB’s driving force for more than 100 years in the power control industry. This same sense of purpose and responsibility will continue as we address future power control challenges.

ABB Zenith Controls, Inc.

305 Gregson Drive Cary, NC 27511

24-hour support:

ABB Technical Services +1 (800) 637-1738 epis.pqservice@abb.com new.abb.com/low-voltage

1S C

C

M

/1

91R-1000A