Mitsubishi Electric C70 Setup Manual page 582

Alarm No.
Over regeneration:
30
Over-regeneration detection level became over 100%. The regenerative resistor is overloaded.
Investigation details
Check if the regenerative capacity exceeds
1
the regenerative resistor tolerable capacity.
Check if the parameter is set incorrectly,
2
and check the values of sv036 and sp032.
3 Is an external regenerative resistor used?
Is the short wire connected between P and
4 D terminal? Are there any problems with the
connection condition?
Is the connection of the regenerative
5 resistor or regeneration resistor cable
correct?
Is the regeneration resistor or the
regeneration resistor cable broken?
6 Disconnect the regenerative resistor
terminal and check the resistance value with
a tester.
Check if the power supply voltage is too
7
high.
Overspeed
Alarm No.
The motor was detected to rotate at a speed exceeding the allowable speed (In the case of linear motor, it was detected
31
to move at a speed exceeding the allowable speed).
Investigation details
Check if the unit in which the alarm was
1
detected is servo or spindle.
Check the servo parameters SV001 (PC1),
2 SV002 (PC2), SV018 (PIT) and SV025
(MTYP) settings.
Check the spindle parameter SP026 (TSP)
3
setting.
4 Check the PLG output waveform.
Check whether the speed waveform is
5
overshooting.
6 Check the repeatability.
Investigation results
The regenerative capacity exceeds the
regenerative resistor tolerable capacity.
The regenerative resistor selection is
appropriate.
The parameters are set incorrectly.
The parameters are correct.
An external regenerative resistor is used.
A built-in regenerative resistor is used.
The wire is not connected.
The connector is disconnected.
The connector has a contact fault.
The connection is incorrect.
The connection is correct.
The regeneration resistor is broken. Or the
resistance value is large.
The regeneration resistor cable is broken.
The resistance value is normal.
The power supply voltage exceeded 253V. Review the power supply.
The power supply voltage is normal.
Investigation results
The alarm was detected in servo.
The alarm was detected in spindle.
The settings are incorrect.
Correctly set.
The setting is incorrect.
The alarm is detected at 115% of SP026.
Correctly set.
There is a problem.
Normal.
The waveform is overshooting.
The waveform is not overshooting.
[1] The alarm occurs when the motor is
stopped.
[2] The rotation speed displayed on the
drive monitor varies when the motor is
stopped.
The alarm occurs at all time.
Appendix 2.16 Troubleshooting
Remedies
Add the option regenerative resistor or
replace it.
Check the investigation item No. 2.
Change the parameters.
Check the investigation item No. 3.
Check the investigation item No. 5.
Check the investigation item No. 4.
Connect the wire.
Reconnect the connector.
Replace the connector.
Rewire.
Check the investigation item No. 6.
Replace the regenerative resistor.
Replace the cable.
Check the investigation item No. 7.
Replace the drive unit.
Remedies
Check the investigation item No. 2.
Check the investigation item No. 3.
Correctly set.
Check the investigation item No. 5.
Correctly set.
Check the investigation item No. 4.
Adjust the PLG output waveform.
Check the investigation item No. 5.
Increase the acceleration/ deceleration time
constant.
Lower the load inertia.
Check if there is any abnormality in the
unit's ambient environment.
(Ex.: Ambient temperature, noise,
grounding)
Check the investigation item No. 6.
Replace the detector or detector cable.
Replace the drive unit.
C70 Setup Manual
SV SP
SV SP
565