Install Instructions

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