Digital Operator
ALM FLT
Cause
Possible Solution
Input Phase Loss
PF
O
There is phase loss in the drive input power
• Check for wiring errors in the main circuit drive input
power.
• Correct the wiring.
There is excessive fluctuation in the drive input power
voltage
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive
input power.
There is poor balance between voltage phases
Stabilize drive input power or disable phase loss
detection.
Braking Transistor
Fault
rr
O
The braking transistor is damaged
• Cycle power to the drive and check for reoccurrence
of the fault.
• Replace either the control board or the entire drive.
For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
The control circuit is damaged
DC Bus Undervoltage
Uv1
O
O
Input power phase loss
• The main circuit drive input power is wired
incorrectly.
• Correct the wiring.
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 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 a Yaskawa
representative.
Control Power Supply
Voltage Fault
Uv2
O
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. For
instructions on replacing the control board, contact
Yaskawa or a Yaskawa representative.
Internal circuitry is damaged
Undervoltage 3 (Soft-
Charge Bypass Relay
Fault)
Uv3
O
The relay or contactor on the soft-charge bypass relay is
damaged
• 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.
i.7 Troubleshooting
YASKAWA ELECTRIC TOEP YAIP1U 03B YASKAWA AC Drive – P1000 Safety Precautions
57
Summary of Contents for P1000
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