Att A PM of VFD.pdf

Appendix E

7000 “A” Frame 7000A-UM151D-EN-P – March 2013

Preventative Maintenance Schedule

The preventive maintenance activities on the PF7000 Air-Cooled Drive

(“A” Frame or “B” Frame) can be broken down into two categories:

• Operational Maintenance – can be completed while the drive is running.

• Annual Maintenance – should be completed during scheduled downtime.

Refer to the Tools/Parts/Information Requirements at the end of this section for a list of documentation and materials needed to properly complete the preventive maintenance documents.

Operational Maintenance This process really involves only one task: Changing or Cleaning the

Air Filters. The PF7000 drives require consistent, unrestricted airflow to keep the power devices cool. The air filter is the main source of blockage in the air path.

The drive will provide an air filter alarm whenever the pressure differential across the devices drops to a drive-specific level. Referring to the Air Filter Block parameter, this can be anywhere from 7% to 17% blocked, depending on the heatsink and device configuration. This may seem like a small number, but it takes significant blockage to begin to lower the voltage from the pressure sensor. The percentage is a measure of voltage drop, and should not be viewed as a percentage of the opening that is covered. They are not related linearly.

� Once you receive an Air Filter Warning, you should immediately make plans to change or clean the filter. You should still have days or weeks until the drive reaches an Air Filter Fault, but this is dependent on site-specific particle conditions.

This can be done while the drive is running. Refer to User Manual, Chapter 4 – Component Definition and Maintenance for a detailed description of the process.

Preventive Maintenance Check List

E-2 Preventative Maintenance Schedule

7000A-UM151D-EN-P – March 2013 7000 “A” Frame

Annual Maintenance As the name implies, these maintenance tasks should be performed on an annual basis. These are recommended tasks, and depending on the installation conditions and operating conditions, you may find that the interval can be lengthened. For example, we do not expect that torqued power connections will require tightening every year. Due to the critical nature of the applications run on MV drives, the key word is preventive.

Investing approximately 8.0 hours per year on these tasks is time well spent in adding insurance against unexpected downtime.

Initial Information Gathering

Some of the important information to be recorded includes:

� Print Drive Setup

� Print Fault/Warning Queues � Save Parameters to NVRAM

� Save Parameters to Operator Interface

� Circuit Board Part Numbers / Serial Numbers / Revision Letters*

(* This only needs to be recorded if parts have been modified or changed since the last Preventive Maintenance activities)

W A R N I N GW A R N I N G

To prevent electrical shock, ensure the main power has been disconnected before working on the drive. Verify that all circuits are voltage free using a hot stick or appropriate voltage-measuring device. Failure to do so may result in injury or death.

Physical Checks (NO Medium Voltage and NO Control Power)

� Power Connection Inspection

� Inspect PF7000 drive, input/output/bypass contactor sections, and all associated drive components for loose power cable connections and ground cable connections: torque them to the required torque specifications.

� Inspect the bus bars and check for any signs of overheating / discoloration and tighten the bus connections to the required torque specifications.

� Clean all cables and bus bars that exhibit dust build-up.

� Use torque sealer on all connections.

� Carry out the integrity checks on the signal ground and safety grounds.

Preventative Maintenance Schedule E-3

� Check for any visual/physical evidence of damage and/or degradation of components in the low voltage compartments.

� This includes Relays, Contactors, Timers, Terminal connectors, Circuit breakers, Ribbon cables, Control Wires, etc.; Causes could be corrosion, excessive temperature, or contamination.

� Clean all contaminated components using a vacuum cleaner (DO NOT use a blower), and wipe clean components where appropriate.

� Check for any visual/physical evidence of damage and/or degradation of components in the medium voltage compartments (inverter/rectifier, cabling, DC Link, contactor, load break, harmonic filter, etc).

� This includes main cooling fan, power devices, heatsinks, circuit boards, insulators, cables, capacitors, resistors, current transformers, potential transformers, fuses, wiring, etc.; Causes could be corrosion, excessive temperature, or contamination.

� Verify torque on heatsink bolts (electrical connections to bullet assemblies) is within specifications (13.5 N-m).

� Clean all contaminated components using a vacuum cleaner (DO

NOT use a blower), and wipe clean components where appropriate.

� NOTE: An important component to check for contamination is the heatsink. The fine grooves in the aluminum heatsinks can capture dust and debris.

� Carry out the physical inspection and verification for the proper operation of the contactor/isolator interlocks, and door interlocks.

� Carry out the physical inspection and verification for the proper operation of the key interlocks.

� Physical verification of the additional cooling fans mounted in the

AC Line Reactor cabinet, Harmonic Filter cabinet for mounting and connections.

� Carry out the cleaning of the fans and ensure that the ventilation passages are not blocked and the impellers are freely rotating without any obstruction.

� Carry out the insulation meggering of the drive, motor, isolation transformer/line reactor, and the associated cabling.

� Refer to User’s Manual, Appendix D for meggering procedure.

� Check clamp head indicator washers for proper clamp pressure, and adjust as necessary.

� Refer to page 5-17, “Uniform Clamping Pressure” and

“Checking Clamping Pressure” for details on proper clamp pressure.

E-4 Preventative Maintenance Schedule

Control Power Checks (No Medium Voltage)

� Apply Control power to the PowerFlex drive, and test power to all of the vacuum contactors (input, output, and bypass) in the system, verifying all contactors can close and seal in.

� Refer to Publication 1502-UM050_-EN-P for a detailed description of all contactor maintenance.

� Verify all single-phase cooling fans for operation.

� This includes the cooling fans in the AC/DC Power supplies and the DC/DC converter.

� Verify the proper voltage levels at the CPT (if installed), AC/DC

Power Supplies, DC/DC converter, isolated gate power supply boards.

� Refer to Chapter 4 – Commissioning in Reference Manual

(Publication 7000A-RM001_-EN-P) for appropriate procedures/voltage levels for the above checks.

� Verify the proper gate pulse patterns using Gate Test Operating

Mode.

� If there have been any changes to the system during the outage, place the drive in System Test Operating Mode and verify all functional changes.

Final Power Checks before Restarting

� Ensure all cabinets are cleared of tools, and all component connections are back in place and in the running state.

� Put all equipment in the normal operating mode, and apply medium voltage.

� If there were any input or output cables removed, verify the input phasing, and bump the motor for rotation.

� If there were any changes to the motor, input transformer, or associated cabling, you will have to retune the drive to the new configuration using Autotuning.

� Save all parameter changes (if any) to NVRAM.

� Run the application up to full speed/full load, or to customer satisfaction.

� Capture the drive variables while running, in the highest access level if possible.

Annual Maintenance (cont.)

Preventative Maintenance Schedule E-5

Additional Tasks During Preventive Maintenance

� Investigation of customer’s concerns relating to drive performance

� Relate any problems found during above procedures to customer issues.

� Informal instruction on drive operation and maintenance for plant maintenance personnel

� Reminder of safety practices and interlocks on MV equipment, and on specific operating concerns

� Reminder of the need to properly identify operating conditions

� Recommendation for critical spare parts which should be stocked in-plant to reduce production downtime

� Gather information on all spare parts on site, and compare that with factory-recommended critical spares to evaluate whether levels are sufficient.

� Contact MV Spare Parts group for more information.

� Vacuum Bottle Integrity Testing using a Vacuum Checker or AC

Hipot

� Refer to Publication 1502-UM050_-EN-P for a detailed description of all contactor maintenance.

Final Reporting

� A complete, detailed report on all steps in the Preventive

Maintenance procedures should be recorded to identify changes.

� A completed copy of this checklist should be included.

� A detailed description of ALL ADJUSTMENTS AND

MEASUREMENTS that were taken during the process should be included in an addendum (Interlock Adjustments, Loose Connections, Voltage Readings, Megger Results, Parameters, etc.)

� THIS INFORMATION SHOULD BE COMMUNICATED TO MV

PRODUCT SUPPORT SO THAT FUTURE SUPPORT

ACTIVITIES WILL HAVE THE LATEST SITE INFORMATION

AVAILABLE.

� This can be faxed to (519) 740-4756, or

� E-mailed to: MVSupport_Technical@ra.rockwell.com

E-6 Preventative Maintenance Schedule

Time Estimations

� Operational Maintenance 0.5 hours per filter

� Annual Maintenance

� Initial Information Gathering 0.5 hours

� Physical Checks

– Torque Checks 2.0 hours

– Inspection 2.0 hours

– Cleaning ** 2.5 hours **

– Meggering 1.5 hours

� Control Power Checks

– Contactor Adjustments ** 2.0 hours **

– Voltage Level Checks 1.0 hours

– Firing Check 0.5 hours

– System Test ** 2.0 hours **

� Medium Voltage Checks

– Final Inspection 0.5 hours

– Phasing Check ** 1.5 hours **

– Autotuning** 2.0 hours **

– Operation to Maximum Load Site Dependent

� Additional Tasks

– Investigation ** Depends on Nature of the Problem **

– Informal Training/Refresher ** 2.0 hours **

– Spare Parts Analysis ** 1.0 hours **

– Vacuum Bottle Integrity Check ** 3.0 hours **

� Final Report 3.0 hours

Note: ** indicates that the time may not be required depending on the nature of the maintenance and the condition of the drive system. These times are only estimations.

Annual Maintenance

Preventative Maintenance Schedule E-7

Tool / Parts / Information Requirements

The following is a list of the tools recommended for proper maintenance of the PF7000 drives. Not all of the tools may be required for a specific drive preventive procedure, but if we were to complete all of the tasks listed above the following tools would be required.

Tools

� 100 MHz Oscilloscope with minimum 2 Channels and memory

� 5kV DC Megger

� Digital Multimeter

� Torque Wrench

� Laptop Computer with Relevant Software and Cables � Assorted Hand Tools (Screwdrivers, Open Ended Metric Wrenches, Metric Sockets, etc.)

� 5/16 Allen Keys

� Speed Wrench

� Feeler Gauge

� Vacuum Bottle Checker or AC-Hipot � Minimum of 15kV Hotstick / Potential Indicator

� Minimum of 10kV Safety Gloves

� Vacuum Cleaner with Anti-static hose

� Anti-static Cleaning Cloth

� No. 30 Torx Driver

Documentation

� PF7000 User’s Manual – Publication 7000-UM151_-EN-P

� PF7000 Parameters Manual – Publication 7000-TD002_-EN-P � 400A Vacuum Contactor Manual – Publication 1502-UM050_-EN-P

� Drive-Specific Electrical and Mechanical Prints

� Drive-Specific Spare Parts List

Materials

� Torque Sealer (Yellow) Part number --- RU6048

� Electrical Joint Compound ALCOA EJC No. 2 or approved equivalent (For Power Devices)

� Aeroshell no. 7 Part number 40025-198-01 (for Vacuum Contactors)

E-8 Preventative Maintenance Schedule

Rockwell recognizes that following a defined maintenance schedule will deliver the maximum product availability. By rigorously following this maintenance schedule, the Customer can expect the highest possible uptime.

This Annual Preventative Maintenance Program includes a visual inspection of all drive components visible from the front of the unit, resistance checks on the power components, power supply voltage level checks, general cleaning and maintenance, checking of all accessible power connections for tightness, and other tasks. For more details, please refer to Chapter 5

(Component Definition and Maintenance) of this User Manual.

I – Inspection

This indicates that the component should be inspected for signs of excessive accumulation of dust/dirt/etc. or external damage (e.g. looking at Filter

Capacitors for bulges in the case, inspecting the heatsinks for debris clogging the air flow path, etc.).

M – Maintenance

This indicates a maintenance task that is outside the normal preventative maintenance tasks, and can include the inductance testing of Line Reactors/DC Links, or the full testing of an isolation transformer.

R – Replacement

This indicates that the component has reached its mean operational life, and should be replaced to decrease the chance of component failure. It is very likely that components will exceed the design life in the drive, and that is dependent on many factors such as usage, heating, etc.

C – Cleaning

This indicates the cleaning of a part that can be reused, and refers specifically to the door-mounted air filters in the liquid-cooled drives and some air-cooled drives.

Rv – Review

This refers to a discussion with Rockwell Automation to determine whether any of the enhancements/changes made to the Drive Hardware and Control would be valuable to the application.

RFB/R – Refurbishment/Replacement

The parts can be refurbished at lower cost OR the parts can be replaced with new ones.

PowerFlex 7000 Maintenance Schedule

Preventative Maintenance Schedule E-9

Rockwell Automation PowerFlex 7000 Preventative Maintenance Service Schedule

Interval Period (in years) 0 1 2 3 4 5 6 7 8 9 10

Commissioning Activities S

Air-Cooling System

Door Mounted Air Filters �� C/R C/R C/R C/R C/R C/R C/R C/R C/R C/R C/R

Main Cooling Fan Motor I I I I I I RFB/R I I I

Redundant Cooling Fan Motor (if supplied) I I I I I I RFB/R I I I

Small Aux. Cooling Fans “Caravel” I I I I R I I I I R

Liquid-Cooling System

Mesh Filters � C C C C C C C C C C C

De-ionizing Filter Cartridge � R R R R R R R R R R R

All Fittings/Connections/Hose Clamps I I I I I I I I I I

Redundant Cooling Pump Motors/Pumps I I I I I I I I I I

Redundant Cooling Pump Motor Seals I I I I I I I I I R

Thermostatic Valve Element I I I I I I R I I I

Power Switching Components

Power Devices (SGCTs/SCRs) I I I I I I I I I I

Snubber Resistors/Sharing Resistors/HECS I I I I I I I I I I

Rectifier Snubber Capacitors I I I I � I I I I � I Rv/R �

Inverter Snubber Capacitors I I I I I I I I I R

Integrated Gate Driver Power Supply I I I I RFB/R I I I I RFB/R

Integral Magnetics/Power

Filters

Isolation Transformer/Line Reactor I I I I M I I I I M

DC Link/Common Mode Choke I I I I M I I I I M

Line/Motor Filter Capacitors I I I I M I I I I M

Control Cabinet Components

AC/DC and DC/DC Power Supplies I I I I RFB/R I I I I RFB/R

Control Boards I I I I I I I I I I

Batteries (DCBs and CIB) I I R I I R I I R I

Batteries (UPS) � I I I I R I I I I R

Connections

Low Voltage Terminal Connections/ Plug-in Connections

I I I I I I I I I I

Medium Voltage Connections I I I I I I I I I I

Heatsink Bolted Connections I I I I I I I I I I

Medium Voltage Connections (Rectifier) � – – – I � – – – I � – I �

Medium Voltage Connections (Inverter) – – – – – – – – – I

Enhancements Firmware – – Rv – – Rv – – Rv –

Hardware – – Rv – – Rv – – Rv –

Operational Conditions

Parameters I I Rv I I Rv I I Rv I

Variables I I Rv I I Rv I I Rv I

Application Concerns I I Rv I I Rv I I Rv I

Spare Parts Inventory/Needs I I Rv I I Rv I I Rv I

� Only applies to air-cooled VFDs (i.e. ‘A’ Frame and ‘B’ Frame) � If filter supplied is not a washable type, replace filter. If filter supplied is a washable type, wash or replace (depending on state of filter).

� Only applies to liquid-cooled VFDs (i.e. ‘C’ Frame) � A 4-year replacement interval applies to 6-pulse or 18-pulse versions. Active Front End rectifiers have a 10-year rectifier snubber capacitor replacement interval.

� Replace UPS batteries yearly for 50°C rated VFDs.

� When rectifier snubber capacitors are replaced, the MV connections for rectifier need to be inspected.

When inverter snubber capacitors are replaced, the MV connections for inverter need to be inspected.

� These components may be serviced while the VFD is running.

E-10 Preventative Maintenance Schedule

Rockwell Automation PowerFlex 7000 Preventative Maintenance Service Schedule (cont.)

Interval Period (in years) 11 12 13 14 15 16 17 18 19 20

Commissioning Activities

Air-Cooling System

Door Mounted Air Filters �� C/R C/R C/R C/R C/R C/R C/R C/R C/R C/R

Main Cooling Fan Motor I I I RFB/R I I I I I I

Redundant Cooling Fan Motor (if supplied) I I I RFB/R I I I I I I

Small Aux. Cooling Fans “Caravel” I I I I R I I I I R

Liquid-Cooling System

Mesh Filters � C C C C C C C C C C

De-ionizing Filter Cartridge � R R R R R R R R R R

All Fittings/Connections/Hose Clamps I I I I I I I I I I

Redundant Cooling Pump Motors/Pumps I I I I I I I I I I

Redundant Cooling Pump Motor Seals I I I I I I I I I R

Thermostatic Valve Element I I I R I I I I I I

Power Switching Components

Power Devices (SGCTs/SCRs) I R I I I I I I I I

Snubber Resistors/Sharing Resistors/HECS I I I I I I I I I I

Rectifier Snubber Capacitors I I � I I I I � I I I Rv/R �

Inverter Snubber Capacitors I I I I I I I I I R

Integrated Gate Driver Power Supply I I I I RFB/R I I I I RFB/R

Integral Magnetics/Power

Filters

Isolation Transformer/Line Reactor I I I I M I I I I M

DC Link/Common Mode Choke I I I I M I I I I M

Line/Motor Filter Capacitors I I I I M I I I I M

Control Cabinet Components

AC/DC and DC/DC Power Supplies I I I I RFB/R I I I I RFB/R

Control Boards I I I I I I I I I I

Batteries (DCBs and CIB) I R I I R I I R I I

Batteries (UPS) � I I I I R I I I I R

Connections

Low Voltage Terminal Connections/ Plug-in Connections

I I I I I I I I I I

Medium Voltage Connections I I I I I I I I I I

Heatsink Bolted Connections I I I I I I I I I I

Medium Voltage Connections (Rectifier) � – I � – – – I � – – – I �

Medium Voltage Connections (Inverter) – – – – – – – – – I

Enhancements Firmware – Rv – – Rv – – Rv – –

Hardware – Rv – – Rv – – Rv – –

Operational Conditions

Parameters I Rv I I Rv I I Rv I I

Variables I Rv I I Rv I I Rv I I

Application Concerns I Rv I I Rv I I Rv I I

Spare Parts Inventory/Needs I Rv i I Rv I I Rv I I

� Only applies to air-cooled VFDs (i.e. ‘A’ Frame and ‘B’ Frame) � If filter supplied is not a washable type, replace filter. If filter supplied is a washable type, wash or replace (depending on state of filter).

� Only applies to liquid-cooled VFDs (i.e. ‘C’ Frame) � A 4-year replacement interval applies to 6-pulse or 18-pulse versions. Active Front End rectifiers have a 10-year rectifier snubber capacitor replacement interval.

� Replace UPS batteries yearly for 50°C rated VFDs.

� When rectifier snubber capacitors are replaced, the MV connections for rectifier need to be inspected.

When inverter snubber capacitors are replaced, the MV connections for inverter need to be inspected.

� These components may be serviced while the VFD is running.

Preventative Maintenance Schedule E-11

General Notes Maintenance of Medium Voltage Motor Control Equipment

A T T E N T I O NA T T E N T I O N

Servicing energized Medium Voltage Motor

Control Equipment can be hazardous. Severe injury or death can result from electrical shock, bump, or unintended actuation of controlled equipment. Recommended practice is to disconnect and lockout control equipment from power sources, and release stored energy, if present.

For countries following NEMA standards, refer to National Fire Protection

Association Standard No. NFPA70E, Part II and (as applicable) OSHA rules for Control of Hazardous Energy Sources (Lockout/Tagout) and OSHA

Electrical Safety Related Work Practices safety related work practices, including procedural requirements for lockout-tagout, and appropriate work practices, personnel qualifications and training requirements, where it is not feasible to de-energize and lockout or tagout electric circuits and equipment before working on or near exposed circuit parts.

For countries following IEC standards, refer to local codes and regulations.

Periodic Inspection

Medium Voltage Motor control equipment should be inspected periodically.

Inspection intervals should be based on environmental and operating conditions and adjusted as indicated by experience. An initial inspection within 3 to 4 months after installation is suggested. Refer to the following standards for general guidelines for setting-up a periodic maintenance program.

For countries following NEMA standards, refer to National Electrical

Manufacturers Association (NEMA) Standard No. ICS 1.1 (Safety Guidelines for the Application, Installation, and Maintenance of Solid-Sate

Control) for MV Drives and ICS 1.3 (Preventive Maintenance of Industrial

Control and Systems Equipment) for MV Controllers.

For countries following IEC standards, refer to IEC 61800-5-1 Sec. 6.5 for MV Drives and IEC 60470 Sec. 10, IEC 62271-1 Sec. 10.4 for MV

Controllers.

E-12 Preventative Maintenance Schedule

General Notes (cont.) Contamination

If inspection reveals that dust, dirt, moisture or other contamination has reached the control equipment, the cause must be eliminated. This could indicate unsealed enclosure openings (conduit or other) or incorrect operating procedures. Replace any damaged or embrittled seals and repair or replace any other damaged or malfunctioning parts (e.g., hinges, fasteners, etc.). Dirty, wet or contaminated control devices must be replaced unless they can be cleaned effectively by vacuuming or wiping. Compressed air is not recommended for cleaning because it may displace dirt, dust, or debris into other parts or equipment, or damage delicate parts.

High Voltage Testing

High voltage insulation resistance (IR) or dielectric withstanding voltage (megger) tests should not be used to check solid-state control equipment.

When meggering electrical equipment, such as transformers or motors, solid-state devices must be bypassed before performing the test. Even though no damage may be readily apparent after a megger test, the solid-state devices are degraded and repeated application of high voltage can lead to failure.

Maintenance after a Fault Condition

Opening of the short circuit protective device (such as fuses or circuit breakers) in a properly coordinated motor branch circuit is an indication of a fault condition in excess of operating overload. Such conditions can cause damage to medium voltage motor control equipment. Before restoring power, the fault condition must be corrected and any necessary repairs or replacements must be made to restore the medium voltage motor control equipment to good working order. Refer to NEMA Standards Publication

No. ICS-2, Part ICS2-302 for procedures. Use only replacement parts and devices recommended by Allen-Bradley to maintain the integrity of the equipment. Ensure the parts are properly matched to the model, series and revision level of the equipment. After maintenance or repair of the equipment, always test the control system for proper functioning under controlled conditions (that avoid hazards in the event of a control malfunction). For additional information, refer to NEMA ICS 1.3, PREVENTIVE MAINTENANCE OF INDUSTRIAL CONTROL AND

SYSTEMS EQUIPMENT, published by the National Electrical Manufacturers Association, and NFPA70B, ELECTRICAL EQUIPMENT

MAINTENANCE, published by the National Fire Protection Association.

Preventative Maintenance Schedule E-13

Part-specific Notes Cooling Fans

Inspect fans used for forced air cooling. Replace any that have bent, chipped, or missing blades, or if the shaft does not turn freely. Apply power momentarily to check operation. If unit does not operate, check and replace wiring, fuse, or fan motor as appropriate. Clean or change air filters as recommended in the Users Manual.

Operating Mechanisms

Check for proper functioning and freedom from sticking or binding. Replace any broken, deformed or badly worn parts or assemblies according to individual product User Manuals. Check for and securely retighten any loose fasteners. Lubricate, if specified in individual product instructions.

Many devices are factory lubricated. If lubrication during use or maintenance of these devices is needed, it will be specified in their individual product instructions and/or User Manual. Note: Allen-Bradley magnetic starters, contactors and relays are designed to operate without lubrication. Do not lubricate these devices, because oil or grease on the pole faces (mating surfaces) of the operating magnet may cause the device to stick in the "ON" mode.

Contacts

Check contacts for excessive wear and dirt accumulations. Vacuum or wipe contacts with a soft cloth if necessary to remove dirt. Contacts are not harmed by discoloration and slight pitting. Contacts should never be filed, as dressing only shortens contact life. Contact spray cleaners should not be used as their residues on magnet pole faces or in operating mechanisms may cause sticking and can interfere with electrical continuity. Contacts should only be replaced after contact face material has become badly worn. Always replace contacts in complete sets to avoid misalignment and uneven contact pressure.

Vacuum Contactors

Contacts of vacuum contactors are not visible, so contact wear must be checked indirectly. Vacuum bottles should be replaced when:

1. The contactor wear indicator line shows need for replacement, or

2. The vacuum bottle integrity tests show need for replacement.

Replace all vacuum bottles in the contactor at the same time to avoid misalignment and uneven contact wear. If the vacuum battles do not require replacement, check and adjust overtravel to the value listed in the product

User Manual.

E-14 Preventative Maintenance Schedule

Part-specific Notes Power Cable and Control Wire Terminals

Loose connections in power circuits can cause overheating that can lead to equipment malfunction or failure. Loose connections in control circuits can cause control malfunctions. Loose bonding or grounding connections can increase hazards of electrical shock and contribute to electromagnetic interference (EMI). Check the tightness of all terminals and bus bar connections and tighten securely any loose connections. Replace any parts or wiring damaged by overheating, and any broken wires or bonding straps.

Refer to the User Manual for torque values required for power cable and bus hardware connections.

Coils

If a coil exhibits evidence of overheating (cracked, melted or burned insulation), it must be replaced. In that event, check for and correct overvoltage or undervoltage conditions, which can cause coil failure. Be sure to clean any residue of melted coil insulation from other parts of the device or replace such parts.

Batteries

Replace batteries periodically as specified in product manual or if a battery shows signs of electrolyte leakage. Use tools to handle batteries that have leaked electrolyte; most electrolytes are corrosive and can cause burns.

Dispose of the old battery in accordance with instructions supplied with the new battery or as specified in the product manual.

Pilot Lights

Replace any burned out lamps or damaged lenses. Do not use solvents or cleaning agents on the lenses.

Preventative Maintenance Schedule E-15

Solid-State Devices

A T T E N T I O NA T T E N T I O N

Use of other than factory recommended test equipment for solid-state controls may result in damage to the control or test equipment or unintended actuation of the controlled equipment. Refer to paragraph titled HIGH

VOLTAGE TESTING.

Solid-state devices require little more than a periodic visual inspection.

Discolored, charred or burned components may indicate the need to replace the component or circuit board. Necessary replacements should be made only at the PC board or plug-in component level. Printed circuit boards should be inspected to determine whether they are properly seated in the edge board connectors. Board locking tabs should also be in place. Solid-state devices must also be protected from contamination, and cooling provisions must be maintained – refer to paragraphs titled CONTAMINATION and

COOLING DEVICES. Solvents should not be used on printed circuit boards.

Locking and Interlocking Devices

Check these devices for proper working condition and capability of performing their intended functions. Make any necessary replacements only with Allen-Bradley renewal parts or kits. Adjust or repair only in accordance with Allen-Bradley instructions found in the product User Manuals.