Digital Operator Display
Fault Name
One of the drive input power wiring terminals
is loose
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
Wire Gauges and Tightening Torque on page 98
There is a problem with the voltage from the
drive input power
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the main
circuit magnetic contactor.
The power has been interrupted
Correct the drive input power.
The capacitors are worn.
• Check the maintenance time for the capacitors (U4-05).
• Replace the entire drive if U4-05 exceeds 90%. Contact Yaskawa or your nearest sales representative.
The relay or contactor on the soft-charge
bypass circuit is damaged.
• Cycle power to the drive.
• If the problem continues, replace the entire drive. Contact Yaskawa or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace the entire drive if U4-06 exceeds 90%. 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
Control power supply wiring is damaged
• Cycle power to the drive.
• If the problem continues, replace the entire drive or the control power supply.
Internal circuitry is damaged
• Cycle power to the drive.
• If the problem continues, replace the entire drive. Contact Yaskawa or your nearest sales representative.
Digital Operator Display
Fault Name
Uv3
Undervoltage 3 (Soft-Charge Bypass Relay Fault)
The soft-charge bypass relay failed.
Cause
Possible Solution
The relay or contactor on the soft-charge
bypass circuit is damaged.
• Cycle power to the drive.
• If the problem continues, replace the entire drive. Contact Yaskawa or your nearest sales representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace the entire drive if U4-06 exceeds 90%. Contact Yaskawa or your nearest sales representative.
6.4 Fault Detection
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
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Troubleshooting
Summary of Contents for U1000 iQpump Drive
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