6. Troubleshooting
6 - 21
Alarm No.
3B
Power module overheat
The power module's temperature protection function activated.
Investigation details Investigation results Remedies SV SP
Large amounts of cutting oil or cutting
chips, etc., are adhered, or the
rotation is slow.
Clean or replace the fan. 1 Confirm that the fan is rotating
correctly.
The fan is rotating properly. Investigate item 2.
{ {
Cutting oil or cutting chips, etc., are
adhered, and the fins are clogged.
Clean the fins. 2 Check whether the heat dissipating
fins are dirty.
The fins are normal. Investigate item 3.
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55°C or more Improve the ventilation and cooling
for the power distribution panel.
3 Measure the drive unit's ambient
temperature.
Less than 55°C. Investigate item 4.
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No abnormality is found in particular. If the alarm occurs even after the unit
temperature has dropped, replace
the unit.
4 Check if there is any abnormality in
the unit's ambient environment.
(Ex. Ambient temperature, noise,
grounding)
An abnormality was found in the
ambient environment.
Take remedies according to the
causes of the abnormality.
Ex. High temperature:
Check the cooling fan.
Incomplete grounding:
Additionally ground.
{ {
Alarm No.
3D
Spindle speed lock
Even when the maximum torque was commanded, the motor speed does not increase to 45r/min or
more.
Investigation details Investigation results Remedies SV SP
Occurs immediately after power is
turned ON.
Investigate item 2. 1 Does the alarm occur immediately
after the power is turned ON?
Occurs after normal operation. Investigate item 5.
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There is abnormal noise. Investigate item 4.
(The initial pole estimate may be
incorrect.)
2 Is there any abnormal noise when
starting?
There is no abnormal noise. Investigate item 3.
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The voltage is not supplied. Correctly supply the PN voltage. 3 Check that the PN voltage is supplied
to the drive unit.
• Is the CHARGE lamp ON?
Approx. 300V is correctly supplied. Investigate item 3.
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The connections are incorrect. Connect correctly. 4 Check the motor power cable (U, V,
W phases). (Also check the operation
immediately after emergency stop is
cancelled.)
• The power cable is not connected.
• Is the cable connected to the motor
for another axis?
• Is the contactor between the drive
unit and motor OFF?
(When using coil changeover
specifications.)
The connections are correct. Investigate item 5.
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The cutting load is large. Lower the cutting load. 5 Check the load value with the spindle
monitor, and investigate the
machine's load state.
The cutting load is not large. Investigate item 6.
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Locked with a mechanical lock. Remove the cause of the lock. 6 Check whether the spindle rotary
section is locked with a mechanical
lock (C-axis clamp, etc.).
Not locked with a mechanical lock. Investigate item 7.
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Improved. Replace the drive unit. 7 Try replacing the drive unit.
Not improved. Investigate the motor.
(Check the motor type and
parameters.)
{
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