YASKAWA A1000 Technical Manual page 139

Digital Operator Display
Cause
In drive models CIMR-Ao2A0004 to
2A0056 or 4A0002 to 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
<2>
<1> Available in drive software versions 1015 and later.
<2> Detected in models CIMR-Ao4A0903 and 4A1200.
YASKAWA ELECTRIC TOEP C710616 41B YASKAWA AC Drive - A1000 Quick Start Guide
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. For
instructions on replacing the control board, contact Yaskawa or a Yaskawa representative.
• 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 a Yaskawa representative.
Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
Uv3
The soft-charge bypass circuit failed.
Gate Drive Board Undervoltage
Uv4
Voltage drop in the gate drive board circuit
Output Voltage Detection Fault
voF
Problem detected with the voltage on the output side of the drive.
Fault Name
Possible Solution
Fault Name
5.2 Fault Detection
5
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