Flowserve L120-190 through L120-2000 - Manual (Page 52)

Limitorque ® L120-190 through L120-2000 FCD LMENIM1203-00 – 10/11
52
Problem Check
Geared limit switch fails to stop valve travel.
A. Control wiring and motor reversing contactor.
B. Geared limit switch setting.
C. Setting rod to see that it has been backed off
aftereach side of the switch has been set.
D. Remove limit switch and inspect for damaged or
broken gear teeth.
Unable to operate actuator by motor.
A. Motor power and control circuits for supply and
continuity.
B. Supply voltage vs.motor and controller nameplate
rating. If O.K., then check motor amperage load.
C. For stalled motor. Shut off power and operate
actuator by handwheel to move the valve.
Excessive handwheel effort.
A. Lubrication method and valve stem for damage.
B. To see if the valve packing gland is too tight.
C. To see if the valve is improperly lubricated.
D. To see if the stem nut is too tight on valve stem.
E. For faulty or damaged valve or parts.
10
Troubleshooting