7.4 Faults
284 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
Code Name Causes Possible Solutions
Uv2 Control Power Undervoltage
The value set in L2-02 [RideThrough Time@Power
Loss] increased and the momentary power loss
recovery unit is not connected to the drive.
Connect the momentary power loss recovery unit to the drive.
There was a problem with the drive hardware. • Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact the
manufacturer or your nearest sales representative.
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 Causes Possible Solutions
Uv3 Soft Charge Answerback Fault
The relay or contactor on the soft-charge bypass
relay is damaged.
• Re-energize the drive.
• If the fault stays, replace the control board or the drive.
• Check monitor U4-06 [SoftChgRelay Maint] 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 board, contact the manufacturer or your
nearest sales representative.
Note:
• Do a Fault Reset to clear the fault.
• Fault trace is not available for this fault.
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