Mitsubishi Electric UM 10t, Instruction Manual

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Problem Cause Remedy
12. The motor overheats (1) Inching operation is performed too frequently. (1) Apply a special design.
(2) Electromagnetic brake not released. (2) See Item 13.
(3) Operating time long (3) Adopt the same remedies as
Item 10, or do not use the
motor too frequently.
(4) Overload. (4) Reduce the load.
13 Pressing a pushbutton
rattles the contactor.
(1) Extreme voltage drop (1) Refer to Item 10.
14. The relay functions, but
the electromagnetic
brake is not released.
The electromagnet will
not attract.
(1) Too large voltage drop, or too low supply
voltage
(1) See Items 10 and 11.
(2) Too large core gap (2) Replace the brake disk.
(3) No gap, or gap adjusted too large. (3) Re-adjust.
(4) Movable parts catch on something. (4) Repair.
(5) Brake circuit cable broken, or screws
loosened.
(5) Check, and repair.
(6) Brake circuit diode (DC) defective (6) Replace the diode assembly.
(7) Coil burnt out. (7) See Item 15.
(8) Too large center clearance (8) Correct.
15. The electromagnetic
brake coil has been
burnt out.
(1) High frequency of uses (1) Correct the operation method,
and replace the coil.
16. The electromagnetic
brake does not work
effectively.
(1) Too large core gap (1) Replace the brake disk.
(2) The relay does not function properly. (2) Replace the relay.
(3) The electromagnetic contactor cannot properly
cut off the power.
(3) Check the internal wiring.
(4) Adhesion of oil to the brake disk (4) Degrease the brake disk, or
replace the brake disk.
(5) The immediate cut-off contactor does not
operate properly. (Direct current)
17. The traversing brake is
too effective or
ineffective.
(1) Brake adjustment failure (1) Adjust the brake properly
with the adjusting bolt.
18. Rotation with the
traversing brake
applied.
(1) Brake coil wire breakage, or mis-connection Replace, or repair.
(2) Diode defective, or mis-connection
(3) Too small or large gap
19. The traversing motor
does not have enough
rotation power, or will
not function.
(1) Brake coil wire breakage, or mis-connection Replace, or repair.
(2) Diode defective, or mis-connection
(3) Too small or large gap
20. The gears make too
loud noise.
(1) Gears and bearings worn out (1) Replace.
21. Traversing wheels spin. (1) The traversing wheel on the driving side is
lifted due to the inclined I-beam.
(1) Install the hoist in the reverse
direction.
(2) Paint, oil, or dust is on the transfer surface of
the I-beam.
(2) Clean, or, if necessary, grind.
22. The trolley wheels are
easily disconnected.
(1) The trolley wire has not been stretched as
specified.
(2) The trolley pole has been installed in the
reverse direction.
(3) Wheels not on the same level
Improve.