Mitsubishi MELDAS MDS-C1 Instruction Manual page 266

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