Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 70)

Chapter 4: Troubleshooting PC NC Maintenance Manual
4-49
AL-05:Inverter output overload
Error Contents The output current flowed more than 120% /min. at 30 min. rating.
Detection Methods The three-phase current detected by the current detector is rectified in
the full wave and converted into the output current detection signal.
Inverter output overload level: 120% /min. or equivalent of inverter
rated current [=30min rating]
Cause and measures
AL-10:The converter is abnormal
Error Contents An error occurred in the converter unit.
Detection Methods Converter error signal [CONFLT] is turned ON if error has occurred in
the converter unit (VS-656MR5). If the converter error signal [CON-
FLT] has been turned ON, it become an alarm.
Cause and measures
Cause Measures
Motor overload Check the load status with the load factor meter.
The frequency of the accel/deceleration
drive is high. Check the accel/deceleration drive frequency from the
drive pattern.
Motor encoder fault Confirm that there is no abnormal motor speed changes by
the speedometer indication or the drive state display (U1-
01). Exchange encoder or motor.
Encoder signal conductor disconnec-
tion, the improper connection, and con-
nector omission. Check the encoder signal wiring.
Motor code improper selection Confirm the control parameter (C1-25) setting and refer to
the setting list.
Control parameter setting is defective. Refer to the setting list for the control parameters.
Control card fault Exchange unit exchange (exchange control card)
Cause Measures
Converter error Confirm error content by the converter LED display.
Control signal connector connection
defect Confirm that there are no loose connectors (5CN, 51CN,
52CN).
Control card fault (inverter) Exchange unit (exchange control card)
Control card fault (converter) Exchange unit (exchange control card)