Install Instructions

Technical Instructions OpenAir GMA Series, Spring Return, 62 lb-in Rotary, Electronic Damper Actuators
Document Number 155-315P25
March 6, 2018
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.