Attachment_7B_142010-26-0151.pdf

OpenAir™

Technical Instructions Document No. 155-315P25

EA GMA

April 19, 2022

GMA Series, Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators

Siemens Industry, Inc.

Description The OpenAir direct-coupled spring return electronic actuator is designed for modulating, two-position, and floating control of building HVAC dampers.

Features • Brushless DC motor technology with stall protection

• Bi-directional fail-safe spring return

• Models available with dual, independently adjustable auxiliary switches

• Unique self-centering shaft coupling

• Manual override

• Available in 62 lb-in torque

• 5° preload as shipped from factory

• Mechanical range adjustment capabilities

• UL and cUL listed, CE certified

• 24 Vac/dc compatible

Application Used in constant or variable air volume installations for the control of return air, mixed air, exhaust, and face and bypass dampers requiring up to 62 lb-in (7 Nm) torque.

Designed for applications that require the damper to return to a fail-safe position when there is a power failure.

Warning/Caution Notations

WARNING:

Personal injury or loss of life may occur if you do not perform a procedure as specified.

CAUTION:

Equipment damage may occur if you do not perform a procedure as specified.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators Document Number 155-315P25 April 19, 2022

Page 2 Siemens Industry, Inc.

Product Numbers

Table 1.

Product Number

Operating Voltage

Control Cables Built-In Control

Options

V a c

V d c

V a c

M o d u la ti n g t o

V d c

M d u la ti n g t o

V

F lo a ti n g

-p o s it io

S ta n d a rd

P le n u m

P s it io n

F e e d b a k

D u a l

A u x il ia ry S w it c h e s

O ff s e t t o

V

S p a n t o

V

In p u t

S ig n a l In v e rs

(D ir e c t o r

In v e rs e

A c ti n g

F e e d b a c k

S ig n a l In v e rs

GMA121.1U ● ● ●

GMA121.1P ● ● ●

GMA121.1P/B ● ● ●

GMA126.1U ● ● ● ●

GMA126.1P ● ● ● ●

GMA221.1U ● ● ●

GMA226.1U ● ● ● ●

GMA131.1U ● ● ●

GMA131.1P ● ● ●

GMA132.1U ● ● ● ●

GMA136.1U ● ● ● ●

GMA151.1U ● ● ● ● ● ●

GMA151.1P ● ● ● ● ● ●

GMA156.1U ● ● ● ● ● ● ●

GMA156.1P ● ● ● ● ● ● ●

GMA161.1U ● ● ● ●

GMA161.1P ● ● ● ●

GMA163.1U ● ● ● ● ●

GMA163.1P ● ● ● ● ●

GMA164.1U ● ● ● ● ● ●

GMA166.1U ● ● ● ● ●

GMA166.1P ● ● ● ● ●

Specifications

Power Supply

24 Vac/24 Vdc

Operating voltage 24 Vac 20%; 24 Vdc 15%

Frequency 50/60 Hz

Power consumption running (GMA 12x, 13x, 15x, 16x) 5 VA/3.5W holding (GMA 12x, 13x, 15x, 16x) 4 VA/3W

Equipment rating Class 2, in accordance with UL/CSA Class III per EN 60730

Power Supply

120 Vac

Operating voltage 120 Vac 10%

Frequency 50/60 Hz

Power consumption running and holding (GMA 22x) 7 VA/5W

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 3

Control Signal

Input signal (wires 8–2) voltage input signal GMA16x 0 to 10 Vdc (max. 35 Vdc) voltage input signal GMA15x 2 to 10 Vdc (max. 35 Vdc) input resistance >100K ohms

Feedback Signal Position output signal (wires 9–2) voltage output signal GMA16x 0 to 10 Vdc voltage output signal GMA15x 2 to 10 Vdc maximum output current +1 mA, -0.5 mA

Function Running/spring return torque 62 lb-in (7 Nm)

Maximum torque 186 lb-in (21 Nm)

Runtime for 90° operating with motor 90 seconds closing (on power loss) with spring return 15 seconds typical

(60 seconds max. at -25°F [-32°C])

Mounting Nominal angle of rotation 90°

Maximum angular rotation 95°

Shaft size 1/4 to 3/4-inch (6.4 to 20.5 mm) dia.

1/4 to 1/2-inch (6.4 to 13 mm) square

Minimum shaft length 3/4-inch (20 mm)

Housing Enclosure NEMA 1 IP54 according to EN 60 529 (limited positions; see OpenAir™ GMA Series Installation Instructions (129-307)

Material Die-cast aluminum alloy

Gear lubrication Silicone-free

Ambient Conditions Ambient temperature operation -25°F to 130°F (-32°C to 55°C) storage and transport -40°F to 158°F (-40°C to 70°C)

Ambient humidity (non-condensing) 95% rh

Agency Certification UL listed to UL60730 (to replace UL873) cUL certified to Canadian Standard C22.2 No. 24-93

Australian Electromagnetic Compatibility (EMC) per AS/NZS 4251.1/2:1999 (C-tick)

Conformity

Low voltage directive (LVD) 2006/95/EC

EN 60 730-2-14

(Type 1)

Electromagnetic compatibility (EMC) 2004/108/EC Immunity for all models, except GMA132.xx EN61000-6-2 Immunity for GMA132.xx EN61000-6-1 Emissions for all models EN61000-6-3

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 4 Siemens Industry, Inc.

Auxiliary Features Control signal adjustment

Offset (start point) Between 0 to 5 Vdc

Span Between 2 to 30 Vdc

Dual auxiliary switches

AC rating (standard cable) 24 to 250 Vac

AC 6A resistive

AC 2A general purpose

AC rating (Plenum cable) 24 Vac

AC 4A resistive

AC 2A general purpose

DC rating (Standard/Plenum cable) 12 to 30 Vdc

DC 2A

Switch Range

Switch A 0° to 90° with 5° intervals

Recommended range usage 0° to 45°

Factory setting 5°

Switch B 0° to 90° with 5° intervals

Recommended range usage 45° to 90°

Factory setting 85°

Switching hysteresis 2°

Apply only AC-line voltage from the same phase or only UL-Class 2 voltage (SELV for CE conformance) to the switching outputs of both auxiliary switches A and B. Mixed operation is not permissible.

NOTE: With plenum cables, only UL-Class 2 voltage (SELV for CE) is permitted.

Feedback potentiometer (GMA 132.1U)

Sliding contact (P2) 0 to 1000 ohm <10 mA Load <1W Voltage UL-Class 2 (SELV/PELV for CE) <24 Vac/dc

Miscellaneous Pre-cabled connection 18 AWG (0.75 mm2)

Cable length 3 feet (0.9 m) length

Noise level 40 dBA

Life cycle Designed for over 60,000 full stroke cycles and a minimum of 1.5 million repositions at rated torque and temperature

Dimensions 8-3/8-in. H × 3-1/4-in. W × 2-2/3-in. D (212 mm H × 83 mm W × 68 mm D)

Weight 2.9 lbs (1.3 kg)

Country of Origin USA

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 5

Actuator Components

Figure 1. Components of the GMA Spring Return Actuator.

Legend

1. Actuator housing

2. Positioning scale for angle of rotation

3. DIP switches and cover

4. Span adjustment

5. Offset (start point) adjustment

6. Mounting bracket

7. Connection cable for power and control signals

8. Connection cable for auxiliary switches or feedback potentiometer

9. Gear train lock pin

10. Manual override wrench opening and direction of rotation arrow

11. Auxiliary switches A and B

12. Position indicator

13. Self-centering shaft adapter

14. Shaft adapter locking clip

15. Position indicator adapter

16. Key for manual adjustment

17. Adjustment tool for: auxiliary switches (11), offset/span (4 and 5), and lock pin (9)

18. 1/2-inch NSPT conduit connections

Accessories NOTE: The auxiliary switches, control signal adjustment, and feedback potentiometer cannot be added in the field. Order the product number that includes the option(s).

Z

Figure 2. Floor/Frame Mount Kit.

ASK71.11: For in-the-air stream applications; anywhere a foot-mounted actuator can be mounted. Can also be directly mounted to a damper frame with louvers and vents and in applications where use of the floor mount is not possible.

Kit contains:

• Crank arm to change the angular rotation into a linear stroke.

• Support bearing ring to minimize side loading on the actuator’s output bearing.

• Mounting bracket, and required mounting fasteners.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 6 Siemens Industry, Inc.

Accessories, Continued

Z

Figure 3. Rotary to Linear Crank Arm Kit.

ASK71.13: Allows a direct-coupled actuator to provide an auxiliary linear drive. Can be used to simultaneously drive a set of opposing or adjacent dampers with a single actuator. Kit contains:

• Crank arm to attach to the splined hub of the shaft adapter.

• Mounting fasteners.

Z

Figure 4. Rotary to Linear Crank Arm Kit with Mounting Bracket.

ASK71.14: Allows economical mounting of an OpenAir actuator to a variety of surfaces. Should be used in applications where the actuator can be rigid-surface mounted and a linear stroke output is required.

Kit contains:

• Crank arm to attach to the splined hub of the shaft adapter.

• Mounting bracket, and other required mounting fasteners.

Figure 5. NEMA 3R Weather Shield.

ASK75.3U: GMA actuators are UL listed to meet NEMA 3R requirements (a degree of protection against rain, sleet, snow, and damage from external ice formation) when installed with ASK75.3U Weather Shield and outdoor-rated conduit fittings in the vertical position.

See Figure 20 for dimensions.

Figure 6. NEMA Type 4X Weather Shield.

ASK75.7U: GMA Actuators are UL listed to meet NEMA Type 4X requirements (a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water, corrosion, and damage from external ice formation) when installed with an ASK75.7U Weather Shield and outdoor-rated conduit fittings. This weather shield may be mounted in any orientation.

For dimensions, see Figure 21.

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 7

Accessories, Continued

Figure 7. Heater/Weather Shield Assembly.

985-107: Provides protection for 24 Vac/dc OpenAir GMA1xx actuators down to temperatures of -58°F (-50°C).

Assembly includes:

• Weather Shield (ASK75.3U)

• Heater Kit (985-108)

Service Parts

985-094P10 Position indicators (10/pkg.)

985-093 Standard shaft adapter.

985-098P10 Adjustment Tool.

985-092 Anti-rotation (mounting) bracket.

985-124 499-ohm resistor assembly kit for

4 to 20 mA applications.

Figure 8. GMA Series Service Parts.

Operation GMA16x, GMA15x

Apply a continuous 0 to 10 Vdc, or 2 to 10 Vdc control signal between wire 8 (Y) and wire 2 (G0) to operate the damper actuator. The angle of rotation is proportional to the control signal.

A 0 to 10 Vdc or 2 to 10 Vdc position feedback output signal is available between wire 9 (U) and wire 2 (G0) to monitor the position of the damper motor.

In the event of a power failure or when the operating voltage is shut off, the actuator returns to the 0 position.

GMA12x and GMA 22x When power is applied, the actuator coupling moves toward the open position "90°". In the event of a power failure or when the operating voltage is shut off, the actuator returns to the 0 position.

GMA13x A floating control signal controls the damper actuator. The actuator’s angle of rotation is proportional to the length of time the signal is applied. A 24 Vac/dc control signal to wire 6 (Y1) causes the actuator coupling to rotate clockwise. A 24 Vac/dc control signal to wire 7 (Y2) causes the actuator coupling to rotate counterclockwise.

With no control voltage, the damper actuator holds its position. In the event of a power failure, the actuator spring returns to the 0 position.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 8 Siemens Industry, Inc.

Overload Protection In the event of a blockage in the damper, the actuator is overload protected over the full range to prevent damage to the actuator.

Life Expectancy An improperly tuned loop will cause excessive repositioning that will shorten the life of the actuator.

Sizing The type of actuator required depends on several factors:

1. Obtain damper torque ratings (lb-in/ft2 or Nm/m2) from the damper manufacturer.

2. Determine the area of the damper.

3. Calculate the total torque required to move the damper:

Total Torque =

SF

AreaDamper Rating Torque

4. Select a spring return actuator using Table 2.

1Safety Factor: When calculating the total torque required, a safety factor should be included for unaccountable variables such as slight misalignments, aging of the damper, etc. A suggested safety factor is 0.80.

NOTE: Mechanically coupled actuators must be of the exact same type except for the dual auxiliary switches and feedback potentiometer options. Use the correct mounting bracket. See Table 2.

Table 2.

DC Power (24 Vdc) AC Power (24 Vac, 120 Vac)

Total Torque Actuator Total Torque Actuator

<62 lb-in (7 Nm) GMA1xx <62 lb-in (7 Nm) GMA

>62 lb-in <160 lb-in (>7 Nm <18 Nm)

GCA12x, GCA13x, GCA15x* >62 lb-in <160 lb-in (>7 Nm <18 Nm)

GCA

>160 lb-in <320 lb-in (>18 Nm <36 Nm)

Use tandem mounting bracket ASK73.1 with any combination of:

• GCA12x actuators

• GCA13x actuators

Use tandem mounting bracket ASK73.2U with any combination of GCA151 and GCA156 actuators.*

>160 lb-in <320 lb-in (>18 Nm <36 Nm)

Use tandem mounting bracket ASK73.1 with any combination of:

• GCA12x actuators

• GCA22x actuators

• GCA13x actuators

• Use tandem mounting bracket ASK73.2U with any combination of:

• GCA151 and GCA156 actuators*

• GCA161 and GCA166 actuators

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 9

Mounting and Installation Flip the actuator to select either clockwise or counterclockwise fail-safe rotation of the damper shaft. Follow steps 1, 2, and 3 of Table 3 to determine the correct actuator mounting orientation.

Table 3. Actuator Mounting Orientation and Damper Control.

• The shaft adapter and the position indicator can be mounted on either side of the actuator. The actuator mounting orientation and shaft length determine how they will be mounted on the actuator.

• The minimum damper drive shaft length is 3/4-inch (20 mm).

• See Specifications for the minimum and maximum damper shaft dimensions.

• The actuator is shipped from the factory with a 5° preload enabling tight close off of the damper in power-fail-close applications.

• A mounting bracket is included with the actuator.

• The shaft adapter and mounting parts are shipped in a separate container with the actuator.

• See the detailed mounting instructions included with each actuator.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 10 Siemens Industry, Inc.

Manual Override

Rotating Locking in place Releasing when power is absent

Figure 9. Manual Override.

NOTE: Always turn the key in the direction of the arrow.

CAUTION:

When engaging the gear train lock pin, carefully turn only about 5 degrees until you meet slight resistance. Turning too far will strip the lock pin.

To Release Manual Override

Do one of the following:

• Restore power and send a control signal.

• When power is absent, do the following:

1. Insert the 3 mm hex key in the override opening.

2. Turn the key in the direction of the arrow.

3. Remove the key.

Mechanical Range Adjustment

The angular rotation is adjustable between 0° and 90° at 5-degree intervals.

To limit the range of shaft movement:

1. Remove the locking clip and self-adjusting shaft adapter.

2. Rotate the damper blade shaft to its failed position.

3. Rotate the shaft coupling to the desired position.

4. Insert the shaft adapter into the actuator and fasten it with the locking clip. See Figure 10.

Figure 10. Mechanical Range Adjustment.

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 11

Control Signal Adjustment

(Offset and Span)

The offset (start point) and span of the control signal can be adjusted. The offset, Uo, can be adjusted between 0 to 5 Vdc. The span, ∆U, can be adjusted between 2 to 30 Vdc.

GMA163

GMA164

Ys Mechanical positioning range (100% = angle of rotation 90°) Yu Control signal Uo Offset (start point)

U Span

1. Uo = 0V, U = 2V The minimum working range for Ys = 100%

2. Uo = 5V, U = 30V The maximum working range for Ys = 100%

3. Uo = 0V, U 30V Factory setting

Factory Setting of 30V span

0 offset

Figure 11. The Minimum and Maximum Control Signal Adjustment.

Example:

Open the actuator from 0 to 50% (45°) using a control signal of:

Umin = 2V to Umax = 10V

Calculating the value of U:

V16

2)(10 x 100

% in rotation of angle Working min) Umax (U %] [ 100 U =

Settings Uo = 2V; U = 16V

Umin = minimum control signal Umax = maximum control signal

Figure 12. Example.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 12 Siemens Industry, Inc.

Dual Auxiliary Switch

GMA126

GMA226

GMA136

GMA156

GMA164

GMA166

Actuator rotary range with the shaft adapter mounted at position 0.

Setting range for switches A and B Setting interval: 5° Switching hysteresis: 2°

To change the settings of A and B:

• Make sure the actuator is in the 0, fail-safe position. The scale is valid only in the 0 position.

• Use the adjustment tool provided with the actuator to turn the switch adjustment dials to the desired setting at which a signal is to be given.

Factory setting:

Switch A = 5°

Switch B = 85°

Figure 13. Adjustable Switching Values for the Dual Auxiliary Switches.

NOTE: Use the long arm of the "†" to point to the position of switch A. Use the narrower tab on the red ring to point to the position of switch B.

DIP Switch Functionality

GMA 151

GMA 156

Description Label Description Function

Inverse Acting Direct-Acting Input Signal Inversion

Inverse-Acting Feedback

Direct-Acting feedback Feedback Signal inversion

Not In Use

Figure 14. DIP Switches.

Input Signal Inversion

Allows inverting the control input signal

The arrow direction indicates opening or closing (closing or opening) when operating an actuator with a given control signal.

= Direct acting (Factory setting) Input signal 2 Vdc ► fail-safe position

= Inverse acting Input signal 10 Vdc ► fail-safe position

Feedback Signal Inversion

Allows inverting the position feedback output signal

= Direct acting feedback (Factory setting)

Fail-safe position ► Output signal 2 Vdc

= Inverse acting feedback, Fail-safe position ► Output signal 10 Vdc

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 13

Wiring All wiring must conform to NEC and local codes and regulations.

Use earth ground isolating step-down Class 2 transformers. Do not use autotransformers.

The maximum rating for a Class 2 step-down transformer is 100 VA. Determine the supply transformer rating by summing the VA ratings of all actuators and all other components used. It is recommended that one transformer power no more than 10 actuators (or 80% of its VA).

Mixed switch operation is not permitted to the switching outputs of both auxiliary switches (A and B).

Either AC line voltage from the same phase must be applied to all six outputs of the dual auxiliary switches, or UL-Class 2 voltage (SELV for CE conformance) must be applied to all six outputs.

NOTE: With Plenum cables only UL-Class 2 voltage (SELV for CE conformance) is permitted.

Installations requiring Conformance:

• Except for the auxiliary switches (See Warning above) all wiring for 24 Vac/dc actuators must only be safety extra-low voltage (SELV) or protective extra-low voltage (PELV) per HD384.

• Use safety transformers per EN61558 with double isolation, designed for 100% duty-cycle for supplying SELV or PELV circuits.

• Over-current protection for supply lines is maximum 10A.

Wire Designations Each wire has the standard symbol printed on it. See Table 4.

Table 4. Wire Designations.

Applicable Actuator

Standard Symbol Function

Terminal Designations Color

24 Vac/dc

1 Supply (SP) G Red

2 Neutral (SN) G0 Black

6 Control signal clockwise Y1 Violet

7 Control signal counterclockwise Y2 Orange

8 Input signal: 0 to 10 Vdc (GMA16x) or 2 to 10 Vdc (GMA15x) Y Gray

9 Position output: 0 to 10 Vdc (GMA16x) or 2 to 10 Vdc (GMA15x) U Pink

120 Vac 3 Line L Black

4 Neutral N White

Auxiliary Switches

S1 Switch A − Common Q11 Gray/red

S2 Switch A − N.C. Q12 Gray/blue

S3 Switch A − N.O. Q14 Gray/pink

S4 Switch B − Common Q21 Black/red

S5 Switch B − N.C. Q22 Black/blue

S6 Switch B − N.O. Q24 Black/pink

Position Feedback

P1 Feedback Potentiometer 0 to 100% P1 - P2 a White/red

P2 Feedback Potentiometer Common b White/blue

P3 Feedback Potentiometer 100 to 0% P3 – P2 c White/pink

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 14 Siemens Industry, Inc.

Wiring Diagrams

GMA12x

24 Vac/dc 2-Position Control

Figure 15.

Class 2

GMA22x

120 Vac

2-Position Control

Figure 16.

GMA13x

Floating Control

Figure 17.

GMA15x GMA16x

Modulating control

Figure 18.

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 15

Special Applications

4 to 20 mA GMA15x

Figure 19. GMA 151 and GMA156, 4 to 20 mA Applications.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 16 Siemens Industry, Inc.

Start-Up/ Commissioning

GMA16x, GMA15x

Spring Return Modulating Control 24 Vac/dc

1. Check Operation:

a. Connect wires 1 (red) and 2 (black) to the 24 Vac/dc power supply.

NOTE: With no input signal present, the GMA15x actuator with input signal inversion switch set to Inverse Acting will start driving towards 90°.

b. Use a Digital Multimeter (DDM) and set the dial to Vdc for the actuator input signal.

c. Connect wires 2 (black) and 8 (gray) to the DMM.

d. Apply to input signal wire 8 (gray):

Y = 10 Vdc or Y = Uo + ∆U (GMA16x) Y = 10 Vdc (GMA15x with input signal inversion switch set to Direct Acting) Y = 2 Vdc (GMA15x with input signal inversion switch set to Inverse Acting)

Allow the actuator shaft coupling to rotate from 0° to 90°.

e. Apply to input signal wire 8 (gray):

Y = 0 Vdc or Y = Uo (GMA16x) Y = 2 Vdc (GMA15x with input signal inversion switch set to Direct Acting) Y = 10 Vdc (GMA15x with input signal inversion switch set to Inverse Acting)

The shaft coupling returns to the 0 position.

2. Check Spring Return:

a. Set the DMM dial to Vdc.

b. Connect wires 2 (black) and 8 (gray) to the DMM.

c. Apply to input signal wire 8 (gray):

Y = 5 Vdc or Y = Uo + 1/2 ∆U (GMA16x) Y = 6 Vdc (GMA15x)

Allow the actuator shaft coupling to rotate halfway.

d. Disconnect wire 1 (red).

The spring returns the actuator shaft coupling to the fail 0 position.

e. Connect wire 1 (red) and the actuator moves.

3. Check Feedback:

a. Set the DMM dial to Vdc.

b. Attach wires 2 (black) and 9 (pink) to the DMM.

c. Apply the input signal as in Step 1d, to wire 8 (gray).

The reading at the DMM should increase (decrease for GMA15x with output signal inversion switch set to Inverse Acting Feedback).

d. Apply the input signal as in Step 1f, to wire 8 (gray).

The reading at the DMM should decrease (increase for GMA 15x with output signal inversion switch set to Inverse Acting Feedback) and the actuator shaft coupling returns to the fail 0 position.

4. Check the Auxiliary Switch A:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S1 and S3 to the DMM. The DMM should indicate open circuit or no resistance.

c. Apply the input signal as in Step 1d, to wire 8 (gray).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

d. Connect wires S1 and S2 to the DMM. The DMM should indicate open circuit or no resistance.

e. Apply the input signal as in Step 1f, to wire 8 (gray).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 17

Commissioning, Continued

5. Check the Auxiliary Switch B:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S4 and S6 to the DMM. The DMM should indicate open circuit or no resistance.

c. Apply the input signal as in Step 1d, to wire 8 (gray).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

d. Connect wires S4 and S5 to the DMM. The DMM should indicate open circuit or no resistance.

e. Apply the input signal as in Step 1f, to wire 8 (gray).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

GMA12x

Spring Return 2-Position 24 Vac/dc

1. Check Operation:

a. Connect wires 1 (red) and 2 (black) to 24 Vac/dc power supply.

Allow the actuator shaft coupling to rotate from 0° to 90°.

b. Disconnect wire 1 (red) and the actuator shaft coupling returns to the 0 position.

2. Check Spring Return:

a. Connect wire 1 (red).

Allow the actuator shaft coupling to rotate halfway.

b. Disconnect wire 1 (red).

The spring returns the actuator shaft coupling to the fail 0 position.

3. Check the Auxiliary Switch A:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S1 and S3 to the DMM.

The DMM should indicate open circuit or no resistance.

c. Connect wire 1 (red).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

d. Connect wires S1 and S2 to the DMM.

The DMM should indicate open circuit or no resistance.

e. Disconnect wire 1 (red).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

4. Check the Auxiliary Switch B:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S4 and S6 to the DMM.

The DMM should indicate open circuit or no resistance.

c. Connect wire 1 (red).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

d. Connect wires S4 and S5 to the DMM.

The DMM should indicate open circuit or no resistance.

e. Disconnect wire 1 (red).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators

Page 18 Siemens Industry, Inc.

Continued

GMA22x

Spring Return 2-Position 120 Vac

WARNING: Switch off 120 Vac power before connecting wires 3 (black) and 4 (white).

1. Check Operation:

a. Switch on 120 Vac power.

Allow the actuator shaft coupling to rotate from 0 to 90°.

b. Switch off 120 Vac power

The actuator shaft coupling will return to the fail 0 position.

2. Check Spring Return:

a. Switch on 120 Vac power.

Allow the actuator shaft coupling to rotate halfway.

b. Switch off 120 Vac power.

The spring returns the actuator shaft coupling to the fail 0 position.

3. Check the Auxiliary Switch A:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S1 and S3 to the DMM.

The DMM should indicate an open circuit or no resistance.

c. Switch on 120 Vac power.

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

d. Connect wires S1 and S2 to the DMM.

The DMM should indicate open circuit or no resistance.

e. Switch off 120 Vac power.

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

4. Check the Auxiliary Switch B:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S4 and S6 to the DMM.

The DMM should indicate open circuit or no resistance.

c. Switch on 120 Vac power.

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

d. Connect wires S4 and S5 to the DMM.

The DMM should indicate open circuit or no resistance.

e. Switch off 120 Vac power.

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

GMA13x

Spring Return Floating

1. Check Operation:

a. Connect wires 1 (red) and 2 (black) to a 24 Vac/dc power supply.

b. Apply a control signal (24 Vac/dc) to wire 6 (violet).

Allow the actuator shaft coupling to rotate from 0 to 90°.

c. Stop the control signal to wire 6 (violet).

d. Apply a control signal (24 Vac/dc) to wire 7 (orange).

Allow the actuator shaft coupling to rotate from 90° to 0°.

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions

Siemens Industry, Inc. Page 19

Continued

GMA13x

Spring Return Floating 24 Vac/dc

2. Check Spring Return:

a. Apply a control signal (24 Vac/dc) to wire 6 (violet).

Allow the actuator shaft coupling to rotate half-way.

b. Disconnect wire 1 (red).

The spring returns the actuator shaft coupling to the fail 0 position.

c. Connect wire 1 (red).

The actuator shaft coupling begins to move.

3. Check Feedback:

a. Set the DMM dial to ohms.

b. Connect wires P1 and P2 to the DMM.

The DMM should indicate a resistive value.

c. Apply a control signal (24 Vac/dc) to wire 6 (violet).

The reading of the DMM should increase.

d. Stop the control signal to wire 6 (violet).

e. Connect wires P2 and P3 to the DMM.

The DMM should indicate a resistive value.

f. Apply a control signal (24 Vac/dc) to wire 7 (orange).

The reading of the DMM should increase.

4. Check the Auxiliary Switch A:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S1 and S3 to the DMM.

The DMM should indicate an open circuit or no resistance.

c. Apply a control signal (24 Vac/dc) to wire 6 (violet).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

d. Stop the control signal to wire 6 (violet).

e. Connect wires S1 and S2 to the DMM.

The DMM should indicate an open circuit or no resistance.

f. Apply a control signal (24 Vac/dc) to wire 7 (orange).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

5. Check the Auxiliary Switch B:

a. Set the DMM dial to ohms (resistance) or continuity check.

b. Connect wires S4 and S6 to the DMM.

The DMM should indicate an open circuit or no resistance.

c. Apply a control signal (24 Vac/dc) to wire 6 (violet).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

d. Stop the control signal to wire 6 (violet).

e. Connect wires S4 and S5 to the DMM.

The DMM should indicate an open circuit or no resistance.

f. Apply a control signal (24 Vac/dc) to wire 7 (orange).

The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electric Damper Actuators

Page 20 Siemens Industry, Inc.

Service

Do not open the actuator.

If the actuator is inoperative, replace the unit.

Troubleshooting

To avoid injury or loss of life, pay attention to any hazardous voltage (For example, 120 Vac) when performing checks.

• Check that the wires are connected correctly.

• Check that span/offset (start point) and Dip switches are set correctly, if used.

• Use a Digital Multimeter (DMM) to verify that the operating voltage is within range.

• If the actuator is not working, check the damper for blockage. If blocked, remove the obstacle and cycle the actuator power off and on. The actuator should resume normal operating mode.

Dimensions

Inches (mm)

Figure 20. ASK75.3U Weather Shield Dimensions.

Figure 21. Dimensions of the ASK75.7U Weather Shield in Inches (Millimeters).

OpenAir Spring Return, GMA Series, 62 lb-in Rotary, Electronic Damper Actuators Technical Instructions

April 19, 2022

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. OpenAir is a trademark of Siemens Schweiz, AG. Product or company names mentioned herein may be the trademarks of their respective owners. © 2022 Siemens Industry, Inc.

Siemens Industry, Inc.

Smart Infrastructure 1000 Deerfield Parkway Buffalo Grove, IL 60089

USA

+ 1 847-215-1000

Your feedback is important to us. If you have comments about this document, please send them to sbt_technical.editor.us.sbt@siemens.com

Document No. 155-315P25 Printed in the USA

Dimensions, Continued

Inches (mm)

Figure 22. GMA Actuator and Mounting Bracket Dimensions.