HQ Series I&M Manual HQ-400-1005 10
21.0 Trouble Shooting
The following instructions are offered for the most common difficulties encounter during installation and
start-up
.
SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
Motor will not Run Open in control circuit Refer to appropriate wiring diagram
and check for continuity
Insulation resistance breakdown 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 Torque switch setting too low Check setting and reset if necessary
partially with motor Limit switch improperly set Check setting and reset if necessary
Torque switch is properly set, but Damaged or bent valve stem Refer to valve maintenance
actuator torques out in mid-travel, Valve packing too tight Refer to valve maintenance
open or closed direction 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 Stripped gearing Replace as necessary
valve Clutch shifter position or malfunction Move shifter, or replace as
necessary
Broken handwheel shaft Replace as necessary
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