YASKAWA A1000 Series Technical Manual page 318

6.4 Fault Detection
Digital Operator Display
Cause
For models CIMR-A 2A0004 through 2A0056 and
CIMR-A 4A0002 through 4A0031: L2-02 was
changed from its default value without installing a
Momentary Power Loss Ride-Thru unit.
Control power supply wiring is damaged.
Internal circuitry is damaged.
Digital Operator Display
Cause
The relay or contactor on the soft-charge bypass circuit
is damaged.
Digital Operator Display
Cause
Hardware is damaged.
<1> Displayed as or
display will show
318
Control Power Supply Voltage Fault
Uv2
Voltage is too low for the control drive input power.
Correct the setting to L2-02 or install an optional Momentary Power Loss Ride-Thru unit.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace the control board, the entire drive, or the control power supply.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
Uv3
The soft-charge bypass circuit has failed.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
Output Voltage Detection Fault
voF
Problem detected with the voltage on the output side of the drive.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
when occurring at drive power up. When one of the faults occurs after successfully starting the drive, the
or .
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual