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