Emerson Vilter VSS - Slide Valve Actuator Troubleshooting Guide (2 of 3)

6 – 2
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Section 6 • Troubleshooting
Table 6-1. Slide Valve Actuator Troubleshooting Guide (2 of 3)
Problem Reason Solution
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
electromagnetic interference
(EMI), such as a contactor, is in
the vicinity of the actuator or
grey cable.
Increase the distance between
the EMI source and the actuator.
Install additional metal shielding
material 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 work-
ing properly.
Get the motor brake to where it
operates freely and recalibrate.
The position sensor’s EEPROM
memory has failed
Replace the actuator.
The actuator does not transmit the cor-
rect position after a power loss.
The motor was manually
moved while the position sen-
sor was not powered.
Recalibrate.
The motor brake is not work-
ing properly.
Get the motor brake to where it
operates freely and recalibrate.
The position sensor’s EEPROM
memory has failed
Replace the actuator.
There is a rapid clicking noise when the
motor is operating.
The photo-chopper is mis-
aligned with the slotted
optocouplers.
Try to realign or replace the
actuator.
The photo-chopper is posi-
tioned too low on the motor
shaft.
Adjust the photo-chopper so
that the fence extends further
into the optocoupler slots.
A motor bearing has failed Replace the actuator.
The motor operates in one direction only
There is a loose connection in
the screw terminal blocks.
Tighten
There is a loose or dirty con-
nection in the yellow Turck
cable.
Clean an tighten
The position sensor has failed. Replace the actuator.
There is a broken motor lead
or winding
Replace the actuator.