22
Instruction Book
IB019008EN October 2016 www.eaton.com
FP-25-LV-VSR
Breaker-To-Motor Starter Conversion
L63 Auxiliary Contact Adjustment
The normal 0.34 in. (8.64 mm) pre-travel gap for the L63 auxiliary
contact (normally-closed) is important. If the gap is too big, the
“hold” winding of the operator coil will not be inserted as the
contactor closes, and the pickup winding will burn out because
the pickup winding is only intermittently rated. If the gap is too
small, the hold winding will be inserted too soon, reducing the
force to “hold” before the contactor is closed, and producing an
oscillation like a doorbell. In a particular contactor, the gap may
need slight adjustment to avoid these problems. The key is not the
measurement, but the performance of the magnet.
The auxiliary contacts are not as critical. In the open position, their
plungers may rest lightly against the operating arm, or may have a
small clearance.
However, neither of the auxiliary contact plungers should bottom
solidly in the closed contactor position, as discussed under Magnet
Operating Range. If required, the auxiliaries can be adjusted by
resetting their mounting brackets in their slotted holes. Adjust the
L63 by loosening the two slotted hexagonal washer head screws
that hold the L63 mounting bracket, repositioning and tightening
them. These bracket mounting screws are accessible from the top
side of the contactor and are recognized by the slotted holes under
their heads.
Table 9. Trouble Shooting Chart.
Symptom
Inspection Area
Possible Defects
Fails To Close
Blown fuse(s) overload relay
Fuses
Overload relay
• Unit experienced an overcurrent or short-circuit
• Unit experienced an overcurrent and that exceeded OL relay set point.
Control circuit
• Fuses blown (control power)
• Secondary disconnects
Undesirably closes
Control circuit
• Close circuit (CS/C shorted)
Fails To Trip
Control circuit
• Fuses blown (control power)
• Secondary disconnects
• T-relay
Undesirably trips
Control circuit
• Trip circuit (CS/T shorted)
• OL relay not set correctly
Fails To Crank
Mechanism
• Dry gear
• Worn gear
• Broken gear
