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10. Troubleshooting
10 - 13
Alarm No.
39
NC-DRV communication: Protocol error 2:
An error was detected in the axis information data received from the CNC.
Cause of occurrence Investigation items Remedy
1
Carry out items for alarm No. 34.
Alarm No.
3A
Overcurrent:
Excessive current was detected in the motor drive current.
Cause of occurrence Investigation items Remedy
Is the VGN1 value higher than the
standard value for the load inertia?
1
Speed lop gain (VGN1) is excessive.
Is vibration occurring?
Lower and adjust VGN1 (SV005).
2
Current loop gain is incorrectly set. Check the current loop gain (SV009,
SV010, SV011, SV012).
Set the standard value.
Is the U, V, W phase connection correct?
3
Motor power cable connection is
incorrect.
Is the cable connected to another axis'
motor?
Correctly connect.
4
Current detection circuit operation is
incorrect.
Check for abnormalities in the unit's
surrounding environment, etc.
(Example: Ambient temperature, noise,
grounding)
Improve the surrounding environment.
5
Carry out items for alarm No. 32.
Alarm No.
3B
Power module overheat:
Thermal protection function in the power module has started its operation.
Cause of occurrence Investigation items Remedy
Large amounts of cutting oil or dust,
etc., are adhered.
1
The fan is not rotating correct.
The rotation is slow.
Clean or replace the fan.
2
The heat dissipating fins are dirty.
Cutting oil or dust, etc., is adhered and
clogging the fins.
Clean the fins.
3
Drive unit's ambient temperature is high.
The temperature exceeds 55ºC. Take measure to ventilate/cool the
panel.
4
Detector circuit operation is incorrect. Check for abnormalities in the unit's
surrounding environment, etc.
(Example: Ambient temperature, noise,
grounding)
Improve the surrounding environment.
5
Drive unit is faulty.
Problem is repeated even when unit
temperature drops.
Replace the drive unit.
Alarm No.
3C
Regeneration circuit error:
An error was detected in the regenerative transistor or in the regenerative resistor.
Cause of occurrence Investigation items Remedy
1
Regenerative resistor is faulty.
Check the regenerative resistor's
resistance value.
Replace the regenerative resistor.
Is the regenerative resistor burned?
2
Regenerative transistor was damaged
because of a short-circuit.
The problem is repeated even when the
regenerative resistor is not faulty.
Replace the drive unit.