Install Instructions

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions
Document Number 155-315P25
March 6, 2018
Siemens Industry, Inc. Page 7
Accessories,
Continued
Figure 7. Heater/Weather Shield
Assembly.
985-108: Provides protection for 24 Vac/dc
OpenAir GMA1xx actuators down to
temperatures of -58°F (-50°C).
Assembly includes:
• Weather Shield
• Heater Kit
Service Parts
985
-
094P10
Position indicators (10/pkg.)
985
-
093
Standard shaft
adapter.
985
-
098
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.