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Bad thermal switch
Any of the reasons listed in “The
motor will not move in either direc-
tion”
Stripped gears inside the gear mo-
tor or the armature has come un-
pressed from the armature shaft
Replace the actuator.
See above.
Replace the actuator.
The motor runs sporadically
The motor runs but output
shaft will not turn
Slide Valve Actuator Trouble Shooting Guide
Problem Reason Solution
Slide Valve Actuators communicate problems discovered by internal diagnostics via LED blink codes. Only one blink
code is displayed, even though it is possible that more than one problem has been detected.
Flash Pattern Meaning
*=ON
_=OFF
*_*_*_*_*_*_*_*_*_*_*_ Calibration step 1
*___*___*___*___*___ Calibration step 2
*__*________________ This indicates a zero span. This error can only occur during calibration. The typical
cause is forgetting to move the actuator when setting the upper limit of the span.
If this is the case, press the blue button to restart the calibration procedure. This
error can also occur if either or both of the slotted optocouplers are not working. If
this is the case, the slide valve actuator will have to be replaced.
The operation of the slotted optocouplers is tested as follows:
1. Manually rotate the motor shaft until the aluminum photochopper fence is not
blocking either of the optocoupler slots.
2. Using a digital multi-meter, measure the DC voltage between terminal 3 of
the small terminal block and TP1 on the circuit board (see Note 1). You should
measure between 0.1 and 0.2 Volts.
3. Next, measure the DC voltage between terminal 3 and TP2 on the circuit
board. You should measure between 0.1 and 0.2 Volts.