6.4 Faults
360 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Code Name Causes Possible Solutions
The relay or contactor on the soft-charge
bypass relay is damaged.
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 board,
contact Yaskawa or your nearest sales
representative.
Note:
• The drive detects this error if the DC bus voltage decreases below the level set in L2-05 [Undervoltage Detection Lvl (Uv1)] while the
drive is running.
• The Uv1 detection level is approximately 190 V for a 200 V class drives. The detection level is approximately 380 V for 400 V class
drives. The detection level is approximately 350 V when E1-01 [Input AC Supply Voltage] < 400.
• Do a Fault Reset to clear the fault.
• Fault trace is not available for this fault.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
Code Name Causes Possible Solutions
Uv2 Control Power
Undervoltage
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.
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 Yaskawa 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 [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 board, contact Yaskawa 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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