Flowserve LY Series Limitorque - Manual (Page 56)

Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11
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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.