YASKAWA GA500 Maintenance & Troubleshooting page 59

Code Name
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
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.
YASKAWA TOEPYAIGA5001A GA500 DRIVE MAINTENANCE & TROUBLESHOOTING
Causes
The relay or contactor on the soft-charge bypass relay
is damaged.
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
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.
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.
2.4 Fault
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