Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 56)

Chapter 4: Troubleshooting PC NC Maintenance Manual
4-35
01:Overcurrent
Error Contents The output current flowed more than the overcurrent detection level.
Detection Methods If the output current exceeds 180% of the rated current of transistor
(IGBT), the gate is instantaneously blocked (regeneration operation
stop) and the overcurrent detection signal is turned ON.
Cause and measures
04:The main circuit fuse fusion
Error Contents The main circuit fuse has fused.
Detection Methods The main circuit fuse signal consists of the gate driver and outputs to
the control card (2CN-6). If the main circuit fuse disconnection detec-
tion signal has been turned ON, the current is intercepted.
Cause and measures
Cause Measures
Main power (R, S, T) open phase, momentary
power failure Check the main power supply ripple.
Servo/inverter control parameter setting defect Set a correct value referencing with the shipment setting.
Servo and inverter fault Check the input current of the servo and the inverter.
Exchanged the servo and the inverter.
Reactor selection defect Perform the proper selection (correspond to the con-
verter capacity).
Converter capacity selection defect Check the capacity connected to servo and inverter.
Exchange the converter.
Current detection signal connector contact
defect Check that there are no loose connectors.
Control card fault Exchange unit exchange (exchange control card)
Cause Measures
Fuse fusion Check fuse (R phase / T phase) continuity.
Exchange the fuse (R phase / T phase).
Gate driver fault Confirm that the fuse (R phase and T phase) does not fuse.
Exchange unit (gate driver exchange)
Control card fault Exchange unit (control card exchange)