Flowserve LY Series Limitorque User Manual
Page 56

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11
56
Symptom
Possible Cause
Corrective Action
Unit operation is noisy
Inadequate lubrication (poor
quality or not enough)
Inspect quality and quantity of
lubrication in accordance with
Section 7.1, Lubrication.
Gearing misaligned
Inspect gearing for uneven wear
pattern and replace gearing as
needed. Most wear is seen in the
motor gear set.
Worn or damaged bearings
Disassemble unit and replace
worn bearings, seals, and
lubricant.
Fuse blown
Incorrect fuse size
Verify fuses are sized correctly.
Pinched wire
Inspect control compartment
to ensure Control Cover is not
pinching or making contact with
wiring when installed.
Power surges
Investigate control circuit for
surges.
Premature Torque Switch trip
Torque Switch setting too low
Increase Torque Switch setting
as Switch trip required, up to but
not exceeding maximum setting
established by the Torque Switch
Limiter Plate.
Valve packing too tight
Inspect valve packing for
excessive tightness. Repair valve
by replacing packing as required.
Refer to your valve manufacturer
for specific instructions.
Unit is not properly aligned with
valve
Take bolts off between the unit and
the valve. Check for proper unit
alignment.
Valve needs lubrication
Check valve lubrication using
grease fitting on bottom of valve.
Torque Switch fails to stop
actuator
Output rotation not in agreement
with unit wiring
Consult Flowserve to verify
design rotation. If actual rotation
is opposite to design rotation,
the Torque Switch needs to have
contact wiring reversed.
Inadequate voltage going to unit
Check incoming voltage supply.
Reversing Starter failure
Starter undersized
Verify starter is sized correctly
for application. Consult factory to
evaluate.
Excessive cycling (too frequent
operation)
Review application to determine
number of starts per hour and
review with factory if more than
100 per hour.
Excessive current draw
Valve running loads higher that
expected
Inspect valve for possible
causes of high running load. In
particular, check for excessive
tightness of valve packing and
for proper lubrication of valve.
Consult Flowserve for review of
application.