YASKAWA CR700

6.4 Fault
362 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
Code Name Causes Possible Solutions
The relay or contactor on the soft-charge bypass
relay is damaged.
Examine the soft-charge bypass relay maintenance time in
monitor U4-06 [PreChargeRelayMainte]. If U4-06 is more than
90%, replace the control board or the drive. For more information
about replacing the control 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 with 400 V class drives. The detection level is
approximately 350 V when E1-01 [Input AC Supply Voltage] is set lower than 400.
• Do a Fault Reset to clear the fault.
• Fault trace is not available for this fault.
Code Name Causes Possible Solutions
Uv2 Control Power Undervoltage
A drive hardware problem occurred. • Re-energize the drive and check if the fault still remains.
• Replace the control board or the entire drive if the fault
continues. Contact Yaskawa or your nearest sales
representative for instructions on replacing the control board.
Note:
• Detected if the control power supply voltage has dropped.
• Perform Fault Reset to clear the fault.
• Fault tracing cannot be executed.
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 control board, contact Yaskawa or your
nearest sales representative.
Note:
• Do a Fault Reset to clear the fault.
• Fault trace is not available for these faults.