[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.