Converter Faults - YASKAWA VS-626M5 Instruction Manual

12.2 Converter Faults

If a fault occurs during operation, protective functions are activated depending on the fault and operation is
stopped. The contents of the faults are displayed numerically on the 7-segment display.
Table 12.1
Fault No.
Converter Faults
Name
Output current exceeded overcurrent
Overcurrent
detection level.
Main circuit fuse
Main circuit fuse was blown.
blown
Output current exceeded overload lev-
Overload
el.
Output voltage exceeded overvoltage
level.
Output overvoltage Detection level:
200 V class: Approx. 400 V
400 V class: Approx. 800 V
Main circuit output voltage became
Main circuit under-
lower than undervoltage detection lev-
voltage
el.
Control circuit power supply became
Control circuit un-
lower than undervoltage detection lev-
dervoltage
el.
Servo unit power Control supply voltage supplied to Ser-
supply fault vo Unit was not normal.
Power supply fre- Excessive power supply frequency
quency fault deviation (50 Hz or 60 Hz ±5%)
Initial charging Charging of main circuit capacitor was
fault not completed within set time.
Power supply open An open phase occurred at input sup-
phase ply.
Built-in MC opera-
Magnetic contactor did not function.
tion fault
Heatsink overheat Heatsink temperature exceeded upper
1 limit (minor fault).
Heatsink overheat Heatsink temperature over upper limit
2 continued for one minute or longer.
Thermistor for heatsink temperature
detection was disconnected.
Heatsink thermis- Heatsink thermis
tor disconnection
The ambient temperature is low
(−20°C (−4°F) or below).
Control PCB tem- Control PCB temperature exceeded
perature fault 1 80°C (176°F) (minor fault).
Control PCB tem- Control PCB temperature exceeded
perature fault 2 85°C (185°F).
12 - 3
Meaning
S Check the wiring.
S Check the input supply voltage.
S Check the AC reactor.
S Check the load shaft (Inverter, Servo)
capacity.
Check for damaged transistor, load
short circuit, ground short, etc.
S Reduce the load.
S Check the load shaft (Inverter, Servo)
capacity.
S Check the input supply voltage.
S Check the load shaft
(Inverter, Servo) capacity.
Check the input supply voltage.
Check the control supply voltage. Check the control supply voltage.
Check the input power waveform.
Replace the Unit.
S Check the input supply voltage.
S Check the wiring.
Replace the Unit.
Check the ambient temperature for ef Check the ambient temperature for ef-
fective cooling.
Replace the unit.
Raise the ambient temperature to above
−20°C (−4°F).
Check the ambient temperature for ef Check the ambient temperature for ef-
fective cooling.
12.2 Converter Faults
Corrective Actions
12