Limitorque LY Series - 7.4 Troubleshooting; Unit will not operate electrically; Motor runs, but no output from unit

LMAIM1501 LY Installation and Maintenance for LY 1001, LY 2001 and LY 3001 7-9
7.4 Troubleshooting
a 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 No power to unit a. Verify power supply is
operate electrically 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 Check Limit Switch development
incorrectly set for agreement with the applicable
wiring diagram. If not set properly,
follow instructions in Section 5.6,
Limit Switch and Mechanical Stop
Settings.
Foreign material on switch Check continuity of microswitch
contacts preventing good with an ohmmeter.
electrical contact.
Motor runs, but no Actuator not coupled properly Inspect Torque Nut and
output from unit to output 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 Verify Torque Nut properly
from Drive Sleeve installed in accordance
with Section 5.3, Installation
(continued) Overview Step No. 1.
Flow Control Division
Limitorque Actuation Systems