YASKAWA A1000 Series Quick Start Manual page 194

5.2 Fault Detection
Digital Operator Display
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 relay is damaged
Digital Operator Display
Cause
In drive models 2A0004 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
Cause
The relay or contactor on the soft-charge
bypass relay is damaged
<1>
<1> Detected in models 4A0930 and 4A1200.
194
DC Bus Undervoltage
One of the following conditions occurred while the drive was running:
• Voltage in the DC bus fell below the undervoltage detection level (L2-05).
• For 200 V class drives: approximately 190 V
Uv1
• For 400 V class drives: approximately 380 V (350 V when E1-01 is less than 400)
• For 600 V class drives: approximately 475 V
The fault is output only if L2-01 is set to 0 or 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.
Wire Gauges and Tightening Torques on page 94
• 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 a Yaskawa representative.
• Cycle power to the drive and see if the fault reoccurs.
• Check monitor U4-06 for the performance life of the soft-charge bypass relay.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa 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. 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 Relay Fault)
Uv3
The soft-charge bypass relay failed.
• Cycle power to the drive and see if the fault reoccurs.
• Check monitor U4-06 for the performance life of the soft-charge bypass relay.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
Gate Drive Board Undervoltage
Uv4
Voltage drop in the gate drive board circuit
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
Refer to Main Circuit
for details.