Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 158

(18) Alarm No.
[Details] Overheating was detected in the IPM used in the spindle drive main circuit. (Capacity:
5.5kW or more only)
Investigation items
1 Investigate the heat
dissipation
environment.
1) Check the rotation
of the fan on the
bottom of unit.
2) Check for oil, dust,
etc., on the heat
radiating fins on the
side of the unit.
3) Measure the unit
ambient
temperature.
2 Investigate the wiring
and installation
environment.
1) Is the unit correctly
grounded?
2) Are there any
devices that
produce noise
around the unit?
(19) Alarm No.
[Details] The one rotation counter value error pulse of the motor PLG exceeded the setting
value (SP90: PLE).
Investigation items
1 Is the speed detector
cable correctly
shielded?
2 Is the encoder cable
broken?
3 Push and pull on the
encoder or speed
detector cable, and
use a tester to check if
a wire is almost
broken.
4 Are the A, B and Z
phase waveforms of
the speed detector
adjusted correctly?
11. Troubleshooting
3B : POWER MODULE OVERHEATING
Investigation results
The fan does not rotate normally.
The heat radiating fins have a lot of
cutting oil, dust, etc., adhered to
them.
The temperature exceeds 55°C.
None of the items is relevant.
1) The grounding is incomplete.
2) The alarm occurs easily when a
specific device is operated.
No particular problem.
42 : FEEDBACK ERROR (MOTOR PLG)
Investigation results
The cable is not correctly shielded.
The cable is correctly shielded.
The cable is broken.
The cable is not broken.
A wire is almost broken.
The wires are normal.
The waveforms deviate.
The waveforms are normal.
Replace the
fan.
Clean the
fan.
Clean the fins.
Give consideration to the panel
ventilation cooling.
Investigate item 2, and carry out the
appropriate measures.
Correctly ground the unit.
Execute noise countermeasures for
the device at the left.
Replace the spindle drive unit.
Correctly shield the cable.
Investigate item 2, and carry out the
appropriate measures.
Use one encoder cable.
Investigate item 3, and carry out the
appropriate measures.
Replace the cable.
Investigate item 4, and carry out the
appropriate measures.
Correctly adjust the waveforms.
Replace the unit, or readjust/replace
the position detector.
11 − 14
Remedy
Take measures so
cutting oil, dust, etc.,
do not get on the fan.
Remedy