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Yaskawa CIMR-PU User Manual

Page 57

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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

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