YASKAWA GA700 Series Technical Manual page 348

7.4 Fault
Code Name
Uv2 Control Power Undervoltage
Note:
• The drive detects this error if the control power supply voltage decreases.
• Do a Fault Reset to clear the fault.
• Fault trace is not available for this fault.
Code Name
Uv3 Soft Charge Answerback Fault
Note:
• Do a Fault Reset to clear the fault.
• Fault trace is not available for these faults.
348
Causes
The value set in L2-02 [Power Loss Ride Through
Time] increased and the momentary power loss
recovery unit is not connected to the drive.
There was a problem with the drive hardware.
Causes
There is damage to the relay or contactor on the
soft-charge bypass relay.
Air inside the drive is too hot.
Possible Solutions
Connect the momentary power loss recovery unit to the drive.
• Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact
Yaskawa or your nearest sales representative.
Possible Solutions
• Re-energize the drive.
• If the fault stays, replace the control board or the drive.
• Monitor U4-06 [PreChargeRelayMainte] shows the
performance life of the soft-charge bypass relay. If U4-06 is
more than 90%, replace the board or the drive. For information
about replacing the control board, contact Yaskawa or your
nearest sales representative.
Decrease the ambient temperature of the drive.
YASKAWA SIEPC71061705H GA700 Series Technical Manual