7.5 Minor Faults/Alarms
286 YASKAWA SIEPC71061753C GA500 Technical Manual
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.
Note:
• The drive detects this error if one of these conditions is correct when the Run command has not been input (while the drive is stopped).
–The DC bus voltage < L2-05 [Undervoltage Detection Lvl (Uv1)].
–The Contactor that prevents inrush current in the drive was opened.
–There is low voltage in the control drive input power.
• If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.
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