[70_Converter Forced Stop Error]; [71_Undervoltage]; [72_Cooling Fan Error]; [73_Regenerative Error] - Mitsubishi Electric -MR-CV User Manual

Power regeneration converter unit
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[70_Converter forced stop error]

• EM1 (Forced stop) of the converter unit was turned off.
Cause
1.
EM1 of the converter unit was turned off.
2.
An external 24 V DC power supply has not been
inputted.
3.
The converter unit has malfunctioned.

[71_Undervoltage]

• The power supply voltage has dropped.
Cause
1.
The power supply connection is incorrect.
2.
The bus voltage (between L+ and L-) is low.
3.
An instantaneous power failure lasted for 60 ms or
more.
4.
The converter unit has malfunctioned.

[72_Cooling fan error]

• The speed of the converter unit cooling fan decreased.
Cause
1.
A foreign object was caught in the cooling fan.
2.
The cooling fan has reached the end of its service
life.

[73_Regenerative error]

• The excessive regeneration protection characteristics of the converter unit were exceeded.
Cause
1.
The regenerative load ratio exceeds 100 %.
8 CONVERTER UNIT TROUBLESHOOTING
80
8.3 Handling methods for alarms/warnings
Check/action method
Check the status of EM1 of the converter unit. After ensuring safety, turn EM1 on.
Input the external 24 V DC power supply.
Replace the converter unit, then check the repeatability.
Check/action method
Check the connection of the power supply.
Refer to the following for connection of the power supply.
Page 32 Example power circuit connections
Check that the bus voltage (between L+ and L-) is not equal to or lower than the
specified value.
200 V class: 190 V DC
400 V class: 380 V DC
Check that the power supply has no problems.
After checking, cycle the power of the converter unit.
Replace the converter unit, then check the repeatability.
Check/action method
Check if a foreign object is caught in the cooling fan. If a foreign object is found,
remove it.
The cooling fan requires to be replaced. For replacement of cooling fans, contact
your local sales office.
Check/action method
Take corrective actions as follows:
• Reduce the frequency of positioning.
• Increase the deceleration time constant.
• Reduce the load.

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