SIEMENS GCA121.1U Open Air GCA Series SR 160 lb In Electronic Damper Actuators Instruction Manual

SIEMENS GCA121.1U Open Air GCA Series SR 160 lb In Electronic Damper

Actuators

Product Information

The GCA Series Spring Return 160 lb-in Electronic Damper Actuators are designed for digital or analog control of building HVAC dampers. They are suitable for use in constant or variable air volume installations for the control of return air, mixed air, exhaust, and face and bypass dampers requiring up to 160 lb-in torque. These actuators are specifically designed for applications that require the damper to return to a fail-safe position in the event of a power failure.

The GCA Series Spring Return 160 lb-in Electronic Damper Actuators are manufactured by Siemens Industry, Inc.

Features

• Operating Voltag e: 24 Vac/dc
• Built-in Control Option s: GCA121.1U, GCA121.1P, GCA126.1U, GCA126.1P, GCA221.1U, GCA226.1U, GCA131.1U, GCA131.1P, GCA132.1U, GCA136.1U, GCA136.1P, GCA151.1U, GCA151.1P, GCA156.1U, GCA156.1P, GCA161.1U, GCA161.1P, GCA163.1U, GCA163.1P, GCA164.1U, GCA164.1P, GCA166.1U, GCA166.1P
• Ambient Conditions
  • Ambient temperature operation storage and transport
  • 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
• Power Supply: 50/60 Hz
• Control Signal
  • GCA16x: 0 to 10 Vdc (max. 35 Vdc)
  • GCA15x: 0 to 10 Vdc or 2 to 10 Vdc (max. 35 Vdc)
  • GCA13x: Floating
  • GCA12x: 2-Position
  • GCA22x: 2-Position
• Frequency Power Consumption
  • Running: 7 VA/5W
  • Holding: 5 VA/3W
• Feedback Signal
  • GCA16x: Position output signal (U-G0) voltage output: 0 to 10 Vdc
  • GCA15x: Position output signal (U-G0) voltage output: 0 to 10 Vdc
  • GCA13x: Position output signal (U-G0) resistance output: 0 to 1000 ohms

Product Usage Instructions

Follow the instructions below for the proper usage of the GCA Series Spring Return 160 lb-in Electronic Damper Actuators

1. Ensure that the actuator is connected to a 24 Vac/dc power supply.
2. Select the appropriate control signal based on your application
   • GCA16x: Use a 0 to 10 Vdc control signal (max. 35 Vdc).
   • GCA15x: Use either a 0 to 10 Vdc or 2 to 10 Vdc control signal (max. 35 Vdc).
   • GCA13x: Use a floating control signal.
   • GCA12x: Use a 2-Position control signal.
   • GCA22x: Use a 2-Position control signal.
3. Connect the control signal cables to the appropriate terminals on the actuator.
4. Ensure that the ambient temperature is within the specified range for operation, storage, and transport.
5. Make sure the ambient humidity is below 95% rh to prevent condensation.
6. If required, connect the feedback signal cables to the corresponding terminals on the actuator.
7. Verify that the actuator is properly installed and secured to the damper.
8. Test the actuator’s functionality by applying power and verifying that it moves the damper as desired.

Always refer to the user manual for detailed instructions specific to your model and application.

Description| The OpenAir 24 Vac/dc spring return 160 lb-in (18 Nm) electronic actuator is designed for digital or analog control of building HVAC dampers.
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Features|

• Brushless DC motor technology with stall protection
• Bi-directional fail-safe spring return
• Patented self-centering shaft coupling
•  Manual override
•  160 lb-in (18 Nm) torque
• 5° preload as shipped from factory
• Offset and span adjustment models available
• Models with independently adjustable dual auxiliary switches available
• UL and cUL listed;      certified

Application| These actuators are designed for use in constant or variable air volume installations for the control of return air, mixed air, exhaust, and face and bypass dampers requiring up to 160 lb-in (18 Nm) torque. They are designed for applications that require the damper to return to a fail-safe position when there is a power failure.

Product Numbers

Product Number

| Operating Voltage| Control| Cables| Built-in Control Options
---|---|---|---|---
24 Vac ± 20%| 24 Vdc ±10%| 120 Vac ± 10%| 0 to 10 Vdc| 2 to 10 Vdc or

0 to 10 Vdc

| Floating| 2-position| Standard| Plenum| Position

Feedback

| Dual Auxiliary Switches| Signal Inversion| Offset 0 to 5 Vdc

Span 2 to 30 Vdc

GCA121.1U| ●| ●| | | | | ●| ●| | | | |
GCA121.1P| ●| ●| | | | | ●| | ●| | | |
GCA126.1U| ●| ●| | | | | ●| ●| | | ●| |
GCA126.1P| ●| ●| | | | | ●| | ●| | ●| |
GCA221.1U| | | ●| | | | ●| ●| | | | |
GCA226.1U| | | ●| | | | ●| ●| | | ●| |
GCA131.1U| ●| ●| | | | ●| | ●| | | | |
GCA131.1P| ●| ●| | | | ●| | | ●| | | |
GCA132.1U| ●| ●| | | | ●| | ●| | ●| | |
GCA136.1U| ●| ●| | | | ●| | ●| | | ●| |
GCA136.1P| ●| ●| | | | ●| | | ●| | ●| |
GCA151.1U| ●| ●| | | ●| | | ●| | ●| | ●|
GCA151.1P| ●| ●| | | ●| | | | ●| ●| | ●|
GCA156.1U| ●| ●| | | ●| | | ●| | ●| ●| ●|
GCA156.1P| ●| ●| | | ●| | | | ●| ●| ●| ●|
GCA161.1U| ●| ●| | ●| | | | ●| | ●| | |
GCA161.1P| ●| ●| | ●| | | | | ●| ●| | |
GCA163.1U| ●| ●| | ●| | | | ●| | ●| | | ●
GCA163.1P| ●| ●| | ●| | | | | ●| ●| | | ●
GCA164.1U| ●| ●| | ●| | | | ●| | ●| ●| | ●
GCA164.1P| ●| ●| | ●| | | | | ●| ●| ●| | ●
GCA166.1U| ●| ●| | ●| | | | ●| | ●| ●| |
GCA166.1P| ●| ●| | ●| | | | | ●| ●| ●| |

Warning/Caution Notations

WARNING:| **| Personal injury/loss of life may occur if you do not perform a procedure as specified.
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CAUTION:| **| Equipment damage may occur if you do not perform a procedure as specified.

Specifications, Continued

Mounting

| Nominal angle of rotation Maximum angular rotation Shaft size

Minimum shaft length

| 90°

95°

3/8-inch to 1-inch

(8 mm to 25.6 mm) diameter

1/4-inch to 5/8-inch (6 to 18 mm) square

3/4-inch (20 mm)

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Auxiliary features| Control signal adjustment

Offset (start point)

Factory setting Span

|

0 Vdc to 5 Vdc

0 Vdc

2 Vdc to 30 Vdc

| Dual auxiliary switches|
AC rating (Standard cable)| 24 Vac to 250 Vac
| AC 6A resistive
| AC 2A FLA, 12 LRA
AC rating (Plenum cable)| 24 Vac
| AC 4A resistive
| AC 2A, FLA, 12 LRA
DC rating (Standard/Plenum cable)| 12 Vdc 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°
| | WARNING

Apply only AC-line voltage from the same phase or only UL-Class 2 voltage 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 is permitted.

Housing| Enclosure

Material

Gear lubrication

| NEMA 2, IP54 per EN 60 529

in vertical to horizontal 90° See Figure 17.

NEMA 3R rated when installed with ASK75.1U Weather Shield in the vertical position. See Figure 18.

See Accessories, Figure 9 . Die-cast aluminum alloy

Silicone-free

Miscellaneous| Pre-cabled connection                                       18 AWG

Cable length                                                      3 feet (0.9 m)

Noise level                                                        <45 dBA (running)

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

Dimensions                                                       See Figure 31.

Weight                                                              4.85 lb (2.2 kg)

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Actuator Components

|

Figure 1. Modulating GCA Actuator.

NOTE: Not all features are on all models.

See Table 1 for a listing of features per model.

| Legend

1. Positioning scale for angle of rotation
2. Manual override wrench
3. opening and direction of
4. rotation arrow
5. DIP switches
6. Span adjustment
7. Offset (start point)
8. adjustment
9. Gear train lock pin
10. Auxiliary switch B
11. Auxiliary switch A
12. Position indicator
13. Self-centering shaft
14. adapter
15. Shaft adapter locking clip
16. Position indicator
17. adapter
18. Mounting bracket
19. Connection cables

Accessories| NOTE: **** The control signal adjustment cannot be added in the field. Order the product number that includes the option(s).
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|

Figure 2. Floor Mount Kit.

| ASK71.1U: Allows foot mounting of OpenAir actuators. Should be used for in-the-air stream applications, and generally, anywhere a foot- mounted actuator can be mounted. Kit contains

·         Crank arm for changing angular rotation into a linear stroke.

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

·         Mounting bracket.

·         Required mounting fasteners.

|

Figure 3. Frame Mount Kit.

| ASK71.2U: Allows mounting OpenAir actuators directly to damper frame. Should be used with louvers and vents and in applications where floor mount kit is not possible. Kit contains

·         Crank arm for changing angular rotation into a linear stroke.

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

·         Mounting bracket.

·         Required mounting fasteners.

|

Figure 4. Crank Arm Kit.

| ASK71.3: Allows direct-coupled actuator to provide an auxiliary linear drive. Crank arm kit can be used to simultaneously drive a set of opposing or adjacent dampers with single actuator. Kit includes

• Crank arm to attach to the splined hub of the shaft adapter.
• Other required mounting fasteners.

|

Figure 5. Crank Arm Kit with Mounting Bracket.

| ASK71.4: Allows economical mounting of OpenAir actuator to a variety of surfaces. Kit should be used in applications where the actuator can be rigid- surface mounted and linear stroke output is required. Kit includes

• Crank arm to attach to the splined hub of the shaft adapter.
• Mounting bracket.
• Other required mounting fasteners.

|

Figure 6. Tandem Mount Bracket.

| ASK73.1: Bracket provides an extended anti- rotation pin allowing two OpenAir actuators to directly drive a single damper shaft. Tandem mounting bracket for two GCA 2-position and floating control actuators mounted on the same side of the damper shaft.
Accessories, Continued|

Figure 7. Tandem Mount Bracket.

| ASK73.2U: Bracket provides an extended anti- rotation pin allowing two OpenAir modulating actuators to directly drive a single damper shaft. Tandem mounting bracket for two GCA16x (standard to 10 Vdc modulating control) Series Actuators mounted on the same side of the damper shaft.

NOTE: For applications requiring single damper shaft operation by up to four GCA modulating control signal actuators mounted on each side of the damper shaft, use the GCA15x Series Actuator with Manager/Subordinate mode operation selected.

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|

Figure 8. Special Shaft Adapter.

| ASK74.1U: Shaft adapter will attach to a 1.05-inch (26.6 mm) diameter shaft; the standard self-centering adapter will accept up to a one-inch (25.4 mm) diameter shaft.

• Adapter can be used for coupling to slightly oversized one-inch (25.4 mm) jackshafts.
• Shaft adapter is 13/16-inches (20 mm) shorter than the height of the self- centering shaft adapter.

|

Figure 9. NEMA 3R Weather Shield.

| ASK75.1U: GCA 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 ASK75.1U Weather Shield and outdoor-rated conduit fittings in the vertical position.

For dimensions, see Figure 29.

|

Figure 10. NEMA Type 4X Weather Shield.

| ASK75.7U: GCA 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 30.

Figure 11. Heater/Weather Shield Assembly.

| 985-106: Provides protection for GIB, GBB and GCA OpenAir actuators down to temperatures of -58°F (-50°C). Assembly includes

• Weather Shield
•  Heater Kit

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|

Figure 12.

499 Ohm Resistor Assembly Kit.

| 985-124 : Used for converting a 4 to 20 mA controller output signal into a 2 to 10 Vdc actuator signal.
Service Parts| | | |
| |

|
985- 003

Position Indicators (10/pkg.)

| 985- 004

Standard Shaft Adapter.

| 985- 006

Anti-rotation (Mounting) Bracket.

| 985- 008

Conduit Adapter, 1/2-inch (12 mm) for 1/2-inch NPT Connector.

Figure 13. Orderable Service Parts.
Operation| GCA12x and GCA22x: 2-Position Control

When power is applied, the actuator coupling moves toward the open position 90°.

| GCA13x: Floating Control

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 Y1 causes the actuator coupling to rotate clockwise. A 24 Vac/dc control signal to Y2 causes the actuator coupling to rotate counterclockwise.

With no control voltage, the damper actuator holds its position.

| GCA16x and GCA15x: Modulating Control

A continuous 0 to 10 Vdc or 2 to 10 Vdc signal from a controller to wire Y operates the damper actuator. The angle of rotation is proportional (or inverse proportional) to the control signal. A 0 to 10 Vdc position feedback output signal between wires U and G0 (system neutral) monitors the position of the damper actuator.

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

In the event of a blockage in a damper, actuators are overload protected over the full range to prevent damage to the actuators.

Life expectancy| An improperly tuned loop will cause excessive repositioning that will shorten the life of the actuator.
Control Signal Adjustment| GCA 163 and GCA164
| 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, DU, can be adjusted between
| 2 to 30 Vdc.
|

Ys        Mechanical positioning range (100% = angle of rotation 90°)

Yu        Control signal

Uo        Offset (start point)

DU        Span

Uo = 0V, DU = 2V

|

The minimum working range for Ys = 100%

1. Uo = 5V, DU = 30V The maximum working range for Ys = 100%

| Setting for 10V span 0V offset
2.  Uo = 0V, DU » 10V Factory setting|
| Figure 14. 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 D U

DU =       100 [ %] (U max – U min)    = 100 x (10 – 2) = 16V Working angle of rotation in % 50

Settings| Uo = 2Y; DU = 16V

Umin = minimum control signal Umax = maximum control signal

|

Figure 15. Example.

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Dual Auxiliary Switch| GCAxx4, GCAxx6

|
|

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

1. Make sure the actuator is in the “0”, fail- safe position. The scale is valid only in the “0” position.
2. Use a flat-blade screwdriver 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 16. Dual Auxiliary Switch Dials.

| NOTE: **** For GCA15x actuators with signal inversion switch set to Inverse Acting, 90° corresponds to either a 0 to 10 Vdc or a 2 to 10 Vdc. Vdc input signal depends on the input signal selection.

Sizing
The type of actuator required depends on several factors.

1. Obtain damper torque ratings (ft-lb/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 =

Torque Rating * Damper Area
SF

1 Safety 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.
4. Select the actuator type using Table 2.

NOTE: Mechanically coupled actuators must all be of the exact same type except for the dual auxiliary switches and feedback potentiometer options. Make sure to use the correct tandem-mounting bracket. See Table 2.

Table 2.

Sizing
Total Torque| Actuator
<62 lb-in (7 Nm)| GMA

62 lb-in <160 lb-in

(>7 Nm <18 Nm)

| GCA

160 lb-in <320 lb-in

(>18 Nm <36 Nm)

| **ASK73.2U*** : Tandem mounting bracket with any combination of two GCA16x (standard 0 to 10 Vdc modulating control) actuators mounted on the same side of the damper shaft.

*ASK73.1:** Tandem mounting bracket for two GCA 2- position and floating control actuators that are mounted on the same side of the damper shaft.

NOTE: For applications requiring single damper shaft operation by up to four GCA modulating control signal actuators mounted on each side of the damper shaft, use the GCA15x Series Actuator with Manager/Subordinate mode operation selected. See Figure 22 for Manager/ Subordinate DIP switch settings, and Figure 27 for wiring of this configuration.

Mounting and Installation

Figure 17.

Acceptable NEMA 2, IP54 per EN 60 529 Mounting Positions.

Figure 18.

Only Acceptable Mounting Position for NEMA Type 3R Rating Using ASK75.1U Weather Shield.
The GCA actuator is UL listed to meet NEMA Type 3R requirements (a degree of protection against rain, sleet, and damage from external ice formation) when installed with the Weather Shield (product number ASK75.1U) and outdoor-rated conduit fittings. Actuator must be in the vertical position.

• 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.

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.

Manual override

Figure 19. Manual Override.

Always turn the key in the direction of the arrow.

CAUTION
When engaging the gear train lock pin, be careful to turn only about five degrees until you hear a click or meet slight resistance. Turning too far will strip the lock pin.

To release manual override, either restore power and send a control signal; or when power is absent, insert the 3 mm hex key in the override opening, turn the key in the direction of the arrow and remove the key.

Mechanical Range Adjustment
The angular rotation is adjustable between 0 and 90° at five-degree intervals. To limit the range of shaft movement, remove the locking clip and self- adjusting shaft adapter. Rotate the damper blade shaft to its failed position. Rotate the shaft coupling to the desired position. Insert the shaft adapter into the actuator and fasten it with the locking clip. See Figure 20.

Figure 20. Mechanical Range Adjustment.

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 other components used. It is recommended that one transformer does not power more than nine actuators (or 80% of its VA).

WARNING
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 must be applied to all six outputs.

NOTE
With plenum cables, only UL-Class 2 voltage is permitted.

Implementation of DIP Switch Features

(GCA15x Only)

Figure 21. GCA15x Series.

Self-Adapt Feature
The factory setting is 0 (OFF).
When mechanical angle of rotation is limited, the self-adapt switch may be turned ON  so that the limited range will become the new 0 to 100% for the actuator  logic. In this case, 0 to 100% is not equal to 90°

CAUTION
When turning the self-adaptive feature on or after a software reset with the feature on, the actuator will enter a three-minute calibration cycle as the actuator adjusts to the rotation limits of the system. A software reset happens after power on or may be caused by electrostatic discharge (ESD) at levels of 2kV and above.

The position output signal U is not influenced by the self-adapt function. The 0 to 10V feedback signal U is always proportional to 0° to 90° (or 90° to 0°).

GCA15x.1x
(0 to 10 Vdc or 2 to 10 Vdc) for Tandem Application

(Manager/ Subordinate)

Figure 22. Tandem Application DIP Switch Settings.

• After setting the 4th DIP switch for TM (tandem mount) on all actuators used in the tandem application, one actuator must be identified as the Manager by selecting the M on the 5th DIP switch.
• The rest of the actuators used in the application must have the S (Subordinate) set on the 5th DIP switch.
• Connect all the 2 (black) Neutral wires and connect them to the power supply.
• Connect all the 1 (red) Supply wires together and connect them to the power supply.
• The Output Signal 9 (pink) wire, identified as the Manager actuator, needs to be connected to all the Control Signal Wires 8 (gray) of the subordinate actuators used in the tandem application.

Wire Designations
Each wire has the standard symbol printed on it. See Table 4. Figure 23. GCA15x, GCA16x, Modulating Control. Figure 24. GCA12x, 2-Position Control. Figure 25. GCA13x, Floating Control. Figure 26. GCA22x, 2-Position Control. Figure 27. GCA15x.1x for Tandem Application (Manager/Subordinate).

Table 4. Wire Designations.

Standard Symbol| ****

Function

| Terminal Designations| Color
---|---|---|---
Standard| Plenum
1| Supply (SP)| G| Red| Red
2| Neutral (SN)| G0| Black| Black
3| Line (120 Vac)| L| Black| Black
4| Neutral (120 Vac)| N| White| White
6| Control Signal clockwise (GCA13x)| Y1| Violet| Violet
7| Control Signal counterclockwise (GCA13x)| Y2| Orange| Orange
8| Input signal : 0 to 10 Vdc (GCA16x) or 2 to 10 Vdc (GCA15x)| Y| Gray| Gray
9| Position outpu t: 0 to 10 Vdc (GCA15x & GCA16x)| U| Pink| Pink
S1| Switch A Common| Q11| Gray/red| Gray/red
S2| Switch A NC| Q12| Gray/blue| Gray/blue
S3| Switch A NO| Q14| Gray/pink| Gray/pink
S4| Switch B Common| Q21| Black/red| Black/red
S5| Switch B NC| Q22| Black/blue| Black/blue
S6| Switch B NO| Q24| Black/pink| Black/pink
P1| Feedback Potentiometer 0 to 100% P1 – P2| A| White/red| Black
P2| Feedback Potentiometer – Common| B| White/blue| Black
P3| Feedback Potentiometer 100 to 0% P3 – P2| C| White/pink| Black

Start-Up/ Commissioning GCA12x
(24 Vac/dc) GCA22x (120 Vac)

1. Check Operation

   • Switch on Vac/dc power.
   • Allow the actuator shaft coupling to rotate from 0 to 90°.
   • Switch off Vac/dc power.
     The actuator shaft coupling will return to the 0 position.

2. Check Spring Return

   • Switch on Vac power.
   • Allow the actuator shaft coupling to rotate halfway.
   • Switch off Vac power.
   • The spring returns the actuator shaft coupling to the fail 0 position.

3. Check the Auxiliary Switch A

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

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

   • Switch on Vac power.
     The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch A.

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

   • Switch off 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

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

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

   • Switch on Vac power.
     The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

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

   • Switch off Vac power.
     The DMM should indicate contact closure as the actuator shaft coupling reaches the setting of switch B.

5. Check Operation

   • Connect wires 1 (red) and 2 (black) to 24 Vdc power supply.
   • Apply a control signal (24 Vac/dc) to wire 6 (violet).
   • Allow the actuator shaft coupling to rotate from 0 to 90°.
   • Stop applying a control signal to wire 6 (violet).
   • Apply a control signal (24 Vac/dc) to wire 7 (orange).
   • Allow the actuator shaft coupling to rotate from 90 to 0°.

6. Check Spring Return

   • Apply a control signal (24 Vac/dc) to wire 6 (violet).
   • Allow the actuator shaft coupling to rotate half way.
   • Disconnect wire 1 (red).
   • The spring returns the actuator shaft coupling to the fail 0 position.
   • Connect wire 1 (red). The actuator shaft coupling begins to move.

7. Check Feedback

   •  Set the digital multimeter (DMM) dial to ohms.

   • Connect wires P1 and P2 to the DMM. The DMM should indicate a resistive value.

   • Apply a control signal (24 Vac/dc) to wire 6 (violet).
     The reading of the DMM should increase.

   • Stop applying a control signal to wire 6 (violet).

   • Connect wires P2 and P3 to the DMM. The DMM should indicate a resistive value.

   • Apply a control signal (24 Vac/dc) to wire 7 (orange).
     The reading of the DMM should increase.

8. Check the Auxiliary Switch A

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

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

   • 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.

   • Stop applying a control signal to wire 6 (violet).

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

   • Apply a control signal (24 Vac/dc) to wire 7 (orange).
     The DMM should indicate contact closure as the actuator actuator-shaft coupling reaches the setting of switch A.

9. Check the Auxiliary Switch B

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

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

   • Apply a control signal (24 Vac/dc) to wire 6 (violet).
     The DMM should indicate contact closure as the actuator actuator-shaft coupling reaches the setting of switch B.

   • Stop applying a control signal to wire 6 (violet).

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

   •  Apply a control signal (24 Vac/dc) to wire 7 (orange).
     The DMM should indicate contact closure as the actuator actuator-shaft coupling reaches the setting of switch B.

GCA15x GCA16x

1. Check Operation

   • Connect wires 1 (red) and 2 (black) to the 24 Vac or 24 Vdc power supply.
     NOTE

   • With no input signal present, the GCA15x actuator with signal inversion switch set to Inverse Acting will start driving towards 90°.

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

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

   • Apply to input signal wire 8 (gray)

   • 10 Vdc or Y = Uo + ∆U (GCA16x)

   • 10 Vdc (GCA15x in direct-acting mode)

   • 2 Vdc (GCA15x in inverse-acting mode)

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

   • Apply to input signal wire 8 (gray)

   • 0 Vdc or Y = Uo (GCA16x)

2. Vdc (GCA15x in direct acting mode)

   • 10 Vdc (GCA15x in inverse acting mode)
   • The shaft coupling returns to the 0 position.
   • Check Spring Return
   • Set the DMM dial to Vdc.
   • Connect wires 2 (black) and 8 (gray) to the DMM.
   • Apply to input signal wire 8 (gray)
   • 5 Vdc or Y =Uo + 1/2 ∆U (GCA16x)
   • 6 Vdc (GCA15x)
   • Allow the actuator shaft coupling to rotate halfway.
   • Disconnect wire 1 (red).
     The spring returns the actuator shaft coupling to the fail 0 position. f. Connect wire 1 (red) and the actuator moves.

3. Check Feedback

   • Set the DMM dial to Vdc.

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

   • Apply the input signal as in Step 1d, to wire 8 (gray).
     The reading at the DMM should increase (decrease for GCA15x in inverse acting mode).

   • Apply the input signal as in Step 1f, to wire 8 (gray).
     The reading at the DMM should decrease (increase for GCA15x in inverse acting mode) and the actuator shaft coupling returns to the fail 0 position.

4. Check the Auxiliary Switch A

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

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

   • 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.

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

   • 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.

5. Check the Auxiliary Switch B

   • Set the DMM dial to ohms (resistance) or continuity check.
   • Connect wires S4 and S6 to the DMM. The DMM should indicate open circuit or no resistance.
   • 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.
   • Connect wires S4 and S5 to the DMM. The DMM should indicate open circuit or no resistance.
   • 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.

Special Application
Modulating 4 to 20 mA control with GCA15x and an external 499-ohm resistor (985-124, See Accessories).

NOTE
985-124 is provided with the GCA15x actuator.

Figure 28.

Wiring Diagram for Converting 4 to 20 mA into 2 to 10 Vdc.

Service
WARNING
Do not open the actuator. If the actuator is inoperative, replace the unit.

Troubleshooting| **| WARNING**

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

---|---|---

• Check that wires are connected correctly.
• Check that offset (start point) and span 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|

Figure 29. Dimensions of the ASK75.1U Weather Shield in Inches (Millimeters).

Figure 30. Dimensions of the ASK75.7U Weather Shield in Inches (Millimeters).

Dimensions, Continued

Figure 31. Dimensions of the GCA Actuator and Mounting Bracket in Inches (Millimeters).

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 registered trademark of Siemens Schweiz AG. Other product or company names mentioned herein may be the trademarks of their respective owners. © 2015-2023 Siemens Industry, Inc.

Siemens Industry, Inc. Smart Infrastructure

• 1000 Deerfield Parkway Buffalo Grove, IL 60089-4513 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. 155-173P25 Printed in the USA

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