Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 154

(10) Alarm No.
[Details] An excessive current flowed to the power component used in the spindle drive unit.
Investigation items
1 Investigate the location
where the
phenomenon
occurred.
2 Check the spindle
parameter (SP034,
SP040, SP055, SP257
and after) setting
values.
3 If the alarm occurs
during cutting, check
the load amount.
4 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.
5 Check the motor
insulation. Carry out a
megger test between
each motor wire and
ground.
6 Check the power
voltage.
7 Investigate the wiring
and installation
environment.
1) Is the unit correctly
grounded?
2) Is there any device
that produces noise
around the unit?
11. Troubleshooting
32 : POWER MODULE ERROR
Investigation results
The phenomenon occurred before
ready ON.
The phenomenon occurred after
servo ON.
The correct value is not set.
The correct value is set.
The load amount is 120% or more.
The load amount is 119% or less.
1) The terminal screws were loose.
2) There was a short-circuit.
3) There was a ground fault.
No particular problem.
The resistance value is 1MΩ or less. Replace the motor.
The resistance value is larger than
1MΩ.
The voltage sometimes becomes
170V or less during acceleration/
deceleration and during cutting.
The voltage is constantly 171V or
more.
1) The grounding is incomplete.
2) The alarm occurs easily when a
specific device is operated.
No particular problem.
Replace the spindle drive unit.
Investigate item 2, and carry out the
appropriate measures.
Set the correct value.
Investigate item 3, and carry out the
appropriate measures.
Decrease the load amount.
Investigate item 4, and carry out the
appropriate measures.
Correctly tighten the screws.
Replace the cable.
Replace the cable.
Investigate item 5, and carry out the
appropriate measures.
Investigate item 6, and carry out the
appropriate measures.
Reconsider the power voltage.
Investigate item 7, and carry out the
appropriate measures.
Correctly ground the unit.
Execute noise countermeasures for
the device at the left.
Replace the spindle drive unit.
11 − 10
Remedy