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6 – 3
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
Section 6 • Troubleshooting
Table 6-1. Slide Valve Actuator Troubleshooting Guide (3 of 3)
Problem
Reason
Solution
The motor will not move in either
direction
The thermal switch has
tripped because
the motor is overheated
The motor will resume opera-
tion when it cools. This could
be caused by a malfunction-
ing control panel. Consult the
factory.
Any of the reasons listed in
“The motor operates in one
direction only”
See above.
The command shaft is
jammed.
Free the command shaft.
Broken gears in the
gear-motor.
Replace the actuator.
Blown relays or fuses.
Check and replace blown relays
and/or fuse
The motor operates intermittently, several
minutes on, several minutes off.
Motor is overheating and the
thermal switch is tripping.
This could be caused by a
malfunctioning control panel.
Consult the factory.
The motor runs sporadically
Bad thermal switch.
Replace the actuator.
Any of the reasons listed in
“The motor operates in one
direction only”
See above.
The motor runs but output shaft will not
turn.
Stripped gears inside the
gear rotor, or the armature
has come unpressed from the
armature shaft.
Replace the actuator.
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