YASKAWA UAK series User Manual page 292

11 Inspection, Maintenance, and Troubleshooting
11.3.2 Troubleshooting of Warnings
Warning
Number:
Warning Name
(Warning
Description)
A.91A:
Converter
Electric
Operation
Overload
A.91B:
Converter Power
Supply
Regenerative
Overload
A.921:
Dynamic Brake
Overload
(Warning before
the alarm A.731
occurs)
A.923:
Built-in Fan in
SERVOPACK
Stopped
A.92B:
Built-in Fan in
Converter
Stopped
11-38
Cause
The sequence of phase
Check the wiring of the motor's main
U, V, and W motor lines
circuit cable.
is incorrect.
The motor main circuit
cable is either incor-
Make sure the wiring is correct.
rectly wired or has a
contact fault.
A mistake occurred
Check the power regeneration con-
when selecting the
verter capacity and the total output
power regeneration con-
capacity of the SERVOPACK.
verter capacity.
Converter current detec-
−
tion circuit failure
The AC power supply
Measure the power supply voltage.
voltage is low.
A mistake occurred
Check the power regeneration con-
when selecting the
verter capacity and the total output
power regeneration con-
capacity of the SERVOPACK.
verter capacity.
The AC power supply
Measure the power supply voltage.
voltage is low.
Power regeneration
−
converter failure
The servomotor rotates
because of external Check the operation status.
force.
Check the power consumed by DB
The rotating energy at a
resistance monitor in SigmaWin for Σ-
DB stop exceeds the DB
V-SD (MT) to see how many times the
resistance capacity.
DB has been used.
−
SERVOPACK failure
The fan inside the SER- Check for foreign matter or debris
VOPACK stopped. inside the SERVOPACK.
The fan inside the Check for foreign matter or debris
power regeneration con- inside the power regeneration con-
verter stopped. verter.
Investigative Actions
(cont'd)
Corrective Actions
Correct the motor wiring.
Correct the wiring.
Change the power regeneration con-
verter capacity.
Turn the power supply OFF and then
ON again. If the warning still occurs,
the power regeneration converter may
be faulty. Replace the power regenera-
tion converter.
Set AC power supply voltage within
the specified range.
Change the power regeneration con-
verter capacity.
Set AC power supply voltage within
the specified range.
Turn the power supply OFF and then
ON again. If the warning still occurs,
the power regeneration converter may
be faulty. Replace the power regenera-
tion converter.
Take measures to ensure the servomo-
tor will not rotate because of external
force.
Reconsider the following:
• Reduce the servomotor reference
speed.
• Reduce the moment of inertia ratio.
• Reduce the number of times of the
DB stop operation.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Remove foreign matter. If the warning
still occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Remove the foreign matter. If the
warning still occurs, the power regen-
eration converter may be faulty.
Replace the power regeneration con-
verter.