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 electricallyelectrically
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 properlyInspect 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
