6 – 1
VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391STG
Table 6-1. Slide Valve Actuator Troubleshooting Guide (1 of 2)
Section 6 • Troubleshooting
Problem
Reason
Solution
The actuator cannot be calibrated or
exit calibration mode
Dirt or debris is blocking one or both
optocoupler slots
Clean the optocoupler slots with a
Q-Tip and rubbing alcohol.
The photochopper fence extends
less than about half way into the
optocoupler slots
Adjust the photochopper so that
the fence extends further into the
optocoupler slots. Make sure the
motor brake operates freely and
the photochopper will not contact
the optocouplers when the shaft is
pressed down.
The white calibrate wire in the grey
Turck cable is grounded
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal
Dirt and/or condensation on the
position sensor boards are causing it
to malfunction
Clean the boards with an electronics
cleaner or compressed air.
The calibrate button is stuck down
Try to free the stuck button.
The position sensor has failed
Replace the actuator.
Push button is being held down for
more that ¾ second when going
through the calibration proce-
dure
Depress the button quickly and then
let go. Each ¾ second the button is
held down counts as another press.
The actuator goes into calibration
mode spontaneously
The white calibrate wire in the
grey Turck cable is grounding
intermittently
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
A very strong source of electromag-
netic interference (EMI), such as a
contactor, is in the vicinity of the ac-
tuator or grey cable
Tape the end of the white wire in the
panel and make sure that it cannot
touch metal.
Install additional metal shielding ma-
terial between the EMI source and
the actuator or cable.
There is an intermittent failure of the
position sensor
Replace the actuator.
The actuator goes into calibration
mode every time power is restored
after a power loss
The motor brake is not working prop-
erly (see theory section above.)
Get the motor brake to where it
operates freely and recalibrate.
The actuator does not transmit the
correct position after a power loss
The motor was manually moved
while the position sensor was not
powered.
Recalibrate.
The motor brake is not working
properly
Get the motor brake to where it op-
erates freely and then recalibrate.
The position sensor’s EEPROM
memory has failed
Replace the actuator.
