6.4 Fault Detection
274
YASKAWA ELECTRIC
SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
The main circuit capacitors are worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or your nearest sales representative.
The relay or contactor on the soft-charge bypass circuit
is damaged.
• 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.
Digital Operator Display
Fault Name
Uv2
Control Power Supply Voltage Fault
Voltage is too low for the control drive input power.
Cause
Possible Solution
For models CIMR-E
2A0004 through 2A0056 and
CIMR-E
4A0002 through 4A0031: L2-02 was
changed from its default value without installing a
Momentary Power Loss Ride-Thru unit.
Correct the setting to L2-02 or install an optional Momentary Power Loss Ride-Thru unit.
Control power supply wiring is damaged.
• 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.
Internal circuitry is damaged.
• 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.
Digital Operator Display
Fault Name
Uv3
Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
The soft-charge bypass circuit has failed.
Cause
Possible Solution
The relay or contactor on the soft-charge bypass circuit
is damaged.
• 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.
Digital Operator Display
Fault Name
Uv4
Gate Drive Board Undervoltage
Voltage drop in the gate drive board circuit.
Cause
Possible Solution
Not enough power is being supplied to the gate drive
board.
• Cycle power to the drive and see if the fault reoccurs.
Refer to Diagnosing and Resetting Faults on page 287
.
• If the problem continues, replace either the gate drive board or the entire drive. For instructions on replacing the gate board,
contact Yaskawa or a Yaskawa representative.
Digital Operator Display
Fault Name
voF
Output Voltage Detection Fault
Problem detected with the voltage on the output side of the drive.
Cause
Possible Solution
Hardware is damaged.
Replace either the control board or the entire drive. For instructions on replacing the control board, contact Yaskawa or your
nearest sales representative.
<1> Displayed as
or
when occurring at drive power up. When one of the faults occurs after successfully starting the drive, the
display will show
or
.
<2> Occurs in models CIMR-E
4A0930 and 4A1200.
<3> Valid from the drive software version S8001 and later.
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