May 2020
Installation, Operation and Maintenance Manual
VCIOM-15204-EN Rev. 1
20
Section 19: Troubleshooting
The following instructions are offered for the most common difficulties encounter during
installation and start-up.
Table 1.
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
Motor will not run
Open in control circuit
Refer to appropriate wiring
diagram and check for continuity
Insulation resistance break-
down in motor
Perform Megger Test
No power available
to actuator
Tripped circuit breaker
Reset circuit breaker
Handwheel hard to turn
Valve stem improperly
lubricated
Lubricate with grease
Actuator lubrication has
broken down
Clean out old grease and replace with
recommended lubricant
Valve packing gland too tight Loosen packing gland nuts as necessary
Jammed valve
Refer to valve maintenance
Valve only opens or closes
partially with motor
Torque switch setting too low Check setting and reset if necessary
Limit switch improperly set
Check setting and reset if necessary
Torque switch is properly
set, but actuator torques
out in mid-travel, open
or closed direction
Damaged or bent valve stem
Refer to valve maintenance
Valve packing too tight
Refer to valve maintenance
Jammed valve
(obstruction in line)
Refer to valve maintenance
Handwheel will not
operate valve
Stripped gearing
Replace as necessary
Clutch shifter position or
malfunction
Move shifter, or replace as necessary
Broken handwheel shaft
Replace as necessary
Broken valve stem
Repair or replace as necessary
Motor runs but will not
operate valve
Stripped gearing
Replace as necessary
Clutch shifter position or
malfunction
Move shifter, or replace as necessary
Broken handwheel shaft
Replace as necessary
Section 19: Troubleshooting
Troubleshooting