Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 160

(21) Alarm No.
[Details] The value of the current flowing to the spindle motor exceeded the overload detection
level (spindle parameter SP064: OLL), and continued longer than the overload
detection time (spindle parameter SP063: OLT, Standard: 60 sec.).
Investigation items
1 Check the spindle
parameter (SP034,
SP040, SP055, SP257
and following) setting
values.
2 Check the spindle
parameter (SP063 and
SP064) setting values.
3 Check the U, V, W
wiring between the
spindle drive unit and
motor.
1) Are the terminal
screws loose?
2) Is there a
short-circuit in the
wiring between
phases?
3) Is there a ground
fault in one of the
phases? When
checking items 2)
and 3), leave both
ends of the cable
open.
4 Jiggle the speed
detector connector
(spindle drive unit side
and speed detector
side) to see whether it
is coming loose.
5 Turn the power OFF,
and check the speed
detector cable
connection with a
tester.
6 Check the speed
detector waveform.
7 Check the motor load
amount.
8 Check the motor
rotation.
11. Troubleshooting
50 : OVERLOAD
Investigation results
The correct value is not set.
The correct value is set.
The standard value is not set.
The standard value is set.
1) The terminal screws were loose.
2) There was a short-circuit.
3) There was a ground fault.
No particular problem.
Connector came (was coming) loose. Install correctly.
Connectors are normal.
The connection is faulty, or there is a
broken wire.
The connection is normal.
The waveform is incorrect.
The waveform is correct.
The load amount exceeds the motor
rating.
No particular problem.
The motor is locked.
No particular problem.
Set the correct value.
Investigate item 2, and carry out the
appropriate measures.
Set the standard value.
Investigate item 3, and carry out the
appropriate measures.
Correctly tighten the screws.
Replace the cable.
Replace the cable.
Investigate item 4, and carry out the
appropriate measures.
Investigate item 5, and carry out the
appropriate measures.
Replace the detector cable. Correctly
connect the cable.
Investigate item 6, and carry out the
appropriate measures.
Adjust the waveform so it is correct.
Investigate item 7, and carry out the
appropriate measures.
Set the load amount to within the
motor rating.
Investigate item 8, and carry out the
appropriate measures.
Reconsider the machine side.
Replace the unit.
11 − 16
Remedy