Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 152

(7) Alarm No.
[Details] A motor cable ground fault was detected. (Detected only at the ready ON instant.)
Investigation items
1 Check whether the
motor power line (U, V,
W phase) is grounded.
(Check the continuity
between the cables.)
2 Is the motor insulation
faulty?
3 Check the spindle load
amount.
(8) Alarm No.
[Details] Regeneration reached the regeneration capacity limit.
Investigation items
1 Investigate
repeatability.
2 Check the
regenerative resistor
capacity.
3 Check the spindle
parameter (SP041)
setting value.
4 Check the spindle load
amount.
11. Troubleshooting
24 : GROUND FAULT
Investigation results
The motor cable sheath is pulled
back and the power line is grounded.
The power line is coming loose.
The motor insulation is faulty.
The correct value is set.
Frequent starting and stopping.
No particular problem.
30 : EXCESSIVE REGENERATION
Investigation results
The alarm occurs each time the
power is turned ON.
The alarm occurs sometimes.
A small capacity regenerative
resistor is installed.
The correct regenerative resistor is
installed.
The correct value is not set.
The correct value is set.
Frequent starting and stopping.
No particular problem.
Replace the cable.
Correct the connection.
Replace the motor.
Investigate item 3, and carry out the
appropriate measures.
Decrease the starting/stopping
frequency. Or, increase the capacity
of the regenerative resistor.
Replace the spindle drive unit.
Replace the spindle drive unit.
Investigate item 2, and carry out the
appropriate measures.
Change to a regenerative resistor
with the correct capacity.
Investigate item 3, and carry out the
appropriate measures.
Set the correct value.
Investigate item 4, and carry out the
appropriate measures.
Decrease the starting/stopping
frequency. Or, increase the capacity
of the regenerative resistor.
Replace the spindle drive unit.
11 − 8
Remedy
Remedy