Flowserve LY Series Limitorque - Manual (Page 55)

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Limitorque LY Series: LY 1001, LY 2001 and LY 3001 FCD LMENIM1501-00 – 11/11
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7.4 Troubleshooting
c WARNING: Be aware of electrical hazards within the actuator and high-pressure hazards of the
attached valve or other actuated device when installing or performing maintenance on the LY
actuator.
Symptom Possible Cause Corrective Action
Unit will not operate electically No power to unit a. Verify power supply is
electrically correct and present
at actuator.
b. Verify power leads are
connected in accordance with
the applicable wiring diagram.
c. Inspect for blown fuse, tripped
circuit breaker or overload or
open disconnect switch.
Loose or incorrect wiring Check wiring for proper wiring
connection in accordance with the
applicable wiring diagram. Check
also for tight connections.
Limit Switches not set or
incorrectly set Check Limit Switch development
incorrectly set for agreement with
the applicable wiring diagram.
If not set properly, follow
instructions in Section 5.7, Limit
Switch and Mechanical Stop
Settings.
Foreign material on switch
contacts preventing good
electrical contact Check continuity of microswitch
with an ohmmeter.
Motor runs, but no output from
unit Actuator not coupled properly to
output Inspect Torque Nut and Valve
Shaft to verify key is in place and
properly staked.
Worm gear worn out Remove Worm Shaft Assembly
in accordance with Section 7.3.1,
Disassemble Unit LY 1001 or
Section 7.3.3, Disassemble Unit
LY 2001/3001 as applicable.
Inspect worm gear for unusual
wear. If excessive wear has
occurred, replace the Worm Shaft
Assembly.
Torque Nut disengaged from Drive
Sleeve Verify Torque Nut properly
installed in accordance with
Section 5.4, Installation
(continued) Overview Step No. 1.
Motor runs, but no output from
unit Damaged gearing Disassemble actuator in
accordance with Section 7.3.1,
Disassemble Unit LY 1001 or
Section 7.3.3, Disassemble Unit
LY 2001/3001 as applicable.
Inspect gearing for rough or
damaged spots. Replace as
required. Most often, damaged
spots are seen in motor gear set.