[75_Overvoltage]; [76_Switch Setting Error] - Mitsubishi Electric -MR-CV User Manual

[75_Overvoltage]

• The value of the bus voltage exceeded the specified value.
200 V class: 420 V DC
400 V class: 840 V DC
Cause
1.
The regeneration capacity is insufficient.
2.
The power supply voltage is too high.
3.
The servo motor power cable has a ground fault
or has shorted.
4.
The servo motor has a ground fault.
5.
There is a problem with the surrounding
environment.

[76_Switch setting error]

• The setting of the rotary switch is incorrect.
Cause
1.
The value set with the rotary switch (SW1) is set
out of the settable range.
2.
Forced stop has been input when the rotary switch
is set to disable forced stop.
3.
The converter unit has malfunctioned.
Check/action method
Set a longer deceleration time constant, then check the repeatability.
If the error does not repeat, take corrective actions as follows:
• Check the operation pattern.
• Use a converter unit with a larger capacity.
Check if the voltage of the input power supply exceeds the upper limit of the
permissible voltage. If the power supply voltage exceeds the upper limit, reduce the
power supply voltage.
200 V class: 297 V AC
400 V class: 594 V AC
Check if the servo motor power cable has a ground fault. If the servo motor power
cable has a ground fault, correct the wiring.
Check if the servo motor power cable has shorted. If the servo motor power cable
has shorted, replace the servo motor power cable.
After disconnecting the servo motor power cables on the servo motor side, check the
insulation between phases (U/V/W/E). If the servo motor has a ground fault or has
shorted, replace the servo motor.
Check the noise, ambient temperature, and other conditions, and implement
appropriate countermeasures for the cause. If there is noise, take countermeasures
to reduce the noise.
For noise reduction techniques, refer to the following.
Page 96 Noise reduction techniques
Check/action method
Check the settings of the rotary switches.
For details on the rotary switch settings, refer to the following.
Page 28 Converter unit switch settings and operation panel
Check the forced stop wiring and rotary switch setting.
For details on the forced stop wiring and the rotary switch settings, refer to the
following.
Page 28 Converter unit switch settings and operation panel
Page 32 Example power circuit connections
Replace the converter unit, then check the repeatability.
8 CONVERTER UNIT TROUBLESHOOTING
8.3 Handling methods for alarms/warnings
8
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