YASKAWA A1000 Series Quick Start Manual page 109

Cause
Input power phase loss.
One of the drive input power wiring
terminals is loose.
There is a problem with the voltage from
the drive input power.
The power has been interrupted.
The main circuit capacitors are worn.
The relay or contactor on the soft-charge
bypass circuit is damaged.
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
YASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide
DC Bus Undervoltage
One of the following conditions occurred while the drive was stopped:
• Voltage in the DC bus fell below the undervoltage detection level (L2-05)
Uv1
• For 200 V class: approximately 190 V
• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400) The fault is output
only if L2-01 = 0 or L2-01 = 1 and the DC bus voltage has fallen below the level set to L2-05 for
longer than the time set to L2-02.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
and Tightening Torque on page 35
• 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.
Correct the drive input power.
• 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.
• 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.
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.
Output Voltage Detection Fault
voF
Problem detected with the voltage on the output side of the drive.
Possible Solution
Fault Name
Possible Solution
Fault Name
5 Troubleshooting
Refer to Wire Gauges
5
109