Service Parts; Operation - Siemens OpenAir GCA Series Technical Instructions

Technical Instructions
Document No. 155-173P25
January 26, 2011

Service Parts

985-003
Position Indicators
(10/pkg.)

Operation

Life expectancy
Page 8
OpenAir™ GCA Series Spring Return 160 lb-in Electronic Damper Actuator
985-004
Standard Shaft Adapter.
Figure 12. Orderable Service Parts.
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, or 2 to 10 Vdc position feedback output signal is
available between wires U and G0 (system neutral) to monitor 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.
An improperly tuned loop will cause excessive repositioning that will shorten the life
of the actuator.
985-006
Anti-rotation (Mounting)
Bracket.
985-008
Conduit Adapter,
1/2-inch (12 mm)
for 1/2-inch NPT
Connector.
Siemens Industry, Inc.