VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating Service Technical Bulletin
17
Red LED
A flashing red LED indicates a fault condition that prevents the actuator from
operating. Correct the fault condition to allow the actuator to resume operating. If
you detect error Code 16, contact your Johnson Controls representative for further
information.
Table 4: Red LED Warning and Information Flash Codes
Code Description
Meaning
9
Handwheel Is Engaged
(Pulled Outward)
When the handwheel is engaged, the servo can only be
operated manually. This error also occurs if the handwheel
switch is incorrectly connected to the servo.
10
Command Signal
Failure
When the servo is configured to operate in the 0 to 20 mA
mode, an input greater than 20 mA triggers an error. When the
handwheel is configured to run in 4 to 20 mA operating mode,
an input less than 4 mA or greater than 20 mA triggers an
error. The Command Signal is not checked in the 0 to 10 V
mode.
11
Feedback
Potentiometer Failure
If the feedback potentiometer cannot be detected, or if in the
fully closed or fully open position and the feedback
potentiometer is at the end of its travel, an error is detected.
12
Open and Close Limit
Switch Failure
When both the open and close limit switches are
open-circuited at the same time, an error is detected.
13
Open Torque Limit
Reached
The open torque limit switch has been tripped or the open
torque limit switch is incorrectly connected to the servo.
14
Close Torque Limit
Reached
The close torque limit switch has been tripped or the close
torque limit switch is incorrectly connected to the servo.
15
Feedback
Potentiometer Wired in
Reverse
This check is made only during the servo autocalibration. The
feedback potentiometer is wired in reverse when, at the
completion of the calibration, the feedback potentiometer
value at the fully open position is less than the value at the
fully closed position. To clear the error, turn off the power to
the servo, correct the feedback potentiometer wiring, turn on
the power to the servo, and complete the autocalibration.
16
General Servo Failure
If after cycling the power to the servo, this error persists,
contact your local Johnson Controls representative for
assistance.
17
Calibration Error
This flash code is displayed after a failed calibration for
3 seconds. See Code 2 and Code 3 in Table 3 for more
information.