Special Application - Siemens OpenAir GCA Series Technical Instructions

Technical Instructions
Document No. 155-173P25
January 26, 2011
4.
Start-Up
Commissioning
GCA15X
GCA16X
(Continued)
5. Check the Auxiliary Switch B:
Special
Modulating 4 to 20 mA control with GCA15x
and an external 499-ohm resistor (985-124,
Application
See Accessories).
NOTE:
Service
Page 20
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.
a. Set the DMM dial to ohms (resistance) or continuity check.
b. Connect wires S4 and S6 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 B.
d. Connect wires S4 and S5 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 B.
985-124 is provided with the GCA15x
actuator.
WARNING:
Do not open the actuator. If the actuator is inoperative, replace the unit.
OpenAir™ GCA Series Spring Return 160 lb-in Electronic Damper Actuator
499Ω
Resistor
Assembly
from Kit
985-124
Wiring Diagram for Converting
4 to 20 mA into 2 to 10 Vdc.
Supply (+)
Supply
Controller
Control
Signal
Neutral
4 to 20 mA
1 8
Supply Input
2 to 10V
Actuator
Neutral
2
Neutral (-)
Figure 27.
Siemens Industry, Inc.