Specifications

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electric Damper Actuators
Document Number 155-315P25
August 27, 2009
Page 20 Siemens Industry, Inc.
5. Check the Auxiliary Switch B:
Start-Up/
Commissioning,
continued
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.
GMA13x, continued
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.
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 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
2-31/32
(75,8)
12-7/16
(315,5)
3-3/4
(95,3)
1-3/8
(35)
7
(177,8)
∅
1.04
(26,5)
OPENING FOR
STANDARD 1/2"
CONDUIT
CONNECTOR (2)
EA1017R3
Inches (mm)
Figure 20. ASK75.3U Weather Shield Dimensions.