Emerson VSG Operation Manual page 59

Problem
The actuator does not transmit the
correct position after a power loss
There is a rapid clicking noise when
the motor is operating
The motor operates in one direction
only
The motor will not move in either
direction
The motor runs intermittently, sev-
eral minutes on, several minutes off
The motor runs sporadically
The motor runs but output shaft will
not turn
VSG/VSSG • Compact Logix PLC Manual •Vilter/Emerson • 35391CL
Slide Valve Actuator Troubleshooting Guide
The motor was manually moved
while the position sensor was not
powered.
The motor brake is not working
properly
The position sensor's EEPROM
memory has failed
The photochopper is misaligned
with the slotted optocouplers
The photochopper is positioned too
low on the motor shaft.
A motor bearing has failed
There is a loose connection in the
screw terminal blocks
There is a loose or dirty connection
in the yellow Turck cable
The position sensor has failed
There is a broken motor lead or
winding
The thermal switch has tripped be-
cause the motor is overheated
Any of the reasons listed in "The mo-
tor operates in one direction only"
The command shaft is jammed
Broken gears in the gearmotor
Motor is overheating and the ther-
mal switch is tripping
Bad thermal switch
Any of the reasons listed in "The mo-
tor will not move in either direction"
Stripped gears inside the gear
motor or the armature has come un-
pressed from the armature shaft
Reason Solution
Recalibrate.
Get the motor brake to where it op-
erates freely and then recalibrate.
Replace the actuator.
Try to realign or replace the actuator.
Adjust the photochopper so that
the fence extends further into the
optocoupler slots.
Replace the actuator.
Tighten.
Clean and tighten.
Replace the actuator.
Replace the actuator.
The motor will resume operation
when it cools. This could be caused
by a malfunctioning control panel.
Consult the factory.
See above.
Free the command shaft.
Replace the actuator.
This could be caused by a malfunc-
tioning control panel. Consult the
factory.
Replace the actuator.
See above.
Replace the actuator.
59