Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 57)

PC NC Maintenance Manual Chapter 4: Troubleshooting
4-36
05: Overload
Error Contents The output current exceeded the overload level.
Detection Methods Converter output over load level: 120% per one minute of the converter
rated output current [= 30 minutes rating]
Cause and measures
11:Output overvoltage
Error Contents Output voltage exceeded the overvoltage setting value.
Detection Methods The main circuit DC voltage signal [VDET] consists of the gate driver
and outputs to the control card (2CN-20).
If VDET exceeds the main circuit DC voltage detection signal level
[411V], the gate is blocked (regeneration operation stop), and the main
circuit overvoltage detection signal is turned ON.
Cause and measures
Cause Measures
Servo and inverter fault Check the input current of the converter.
Check that there are no errors in the servo and inverter.
Converter capacity selection defect Check the capacity connected to the servo and inverter.
Exchanged the converter.
The frequency of the acceleration/
deceleration drive is high. Check the acceleration/deceleration drive frequency from the
drive pattern.
Control card fault Exchange unit (exchange control card)
Cause Measures
Main power supply (R,S,T) voltage is not
in the specification value. Check the power supply voltage.
Adjust the power supply voltage within the specification value.
Main power supply (R,S,T) open phase,
momentary power off. Check the power supply ripple.
Normalize the power supply.
Converter capacity selection defect Check the capacity connected to servo and inverter.
Exchanged the converter.