YASKAWA GA50U Series User Manual

13 Troubleshooting
YASKAWA TOEPC71061752B GA500 Drive Installation & Primary Operation 119
Code Name Causes Possible Solutions
Uv DC Bus Undervoltage
The drive input power voltage is
changing too much.
• Use a better power supply voltage to
align with the drive rated voltage.
• Make the drive input power stable.
• If there is not a fault with the input
power supply, examine the magnetic
contactor on the main circuit side for
faults.
A phase loss occurred in the drive
input power.
Correct errors with the wiring for main
circuit drive input power.
There is loose wiring in the drive
input power terminals.
Examine for loose screws and tighten them
as specified by the tightening torque values
in the manual.
There was a loss of power. Use a better power supply.
The main circuit capacitors have
deteriorated.
Examine the capacitor maintenance time in
monitor U4-05 [CapacitorMaintenance]. If
U4-05 is more than 90%, replace the control
board or the drive. For information about
replacing the control board, contact
Yaskawa or your nearest sales
representative.
The drive input power transformer
is too small and voltage drops
when the power is switched on.
• Check for an alarm when a molded-case
circuit breaker, Leakage Breaker (ELCB,
GFCI, or RCM/RCD) (with overcurrent
protective function), or magnetic
contactor is ON.
• Check the capacity of the drive power
supply transformer.
Air inside the drive is too hot. Measure the ambient temperature of the
drive.
The Charge LED is broken. Replace the board or the drive. For
information about replacing the control
board, contact Yaskawa or your nearest sales
representative.
◆ Parameter Setting Errors
Parameter setting errors occur when multiple parameter settings do not agree, or when
parameter setting values are not correct. Refer to the table in this section, examine the parameter
setting that caused the error, and remove the cause of the error. You must first correct the
parameter setting errors before you can operate the drive. The drive will not send notification
signals for the faults and alarms when these parameter setting errors occur.

YASKAWA GA50U Series Specifications

General

Brand	YASKAWA
Model	GA50U Series
Category	DC Drives
Language	English