Toshiba VF-AS1 Alarms and Faultspossible causes and the associated remedy. Hopefully this alarm code list
Here is a general list of Toshiba AS1 alarms and fault codes. Included are will help guide you in your troubleshooting.
- OC1 / OC1P Description: Overcurrent during acceleration Causes: The acceleration time ACC is too short, the V/F setting is improper, a restart signal is input to the rotating motor after a momentary stop, etc., a special motor (motor with a small impedance) is used, or manual torque boost ub is large.
Remedy/Solutions: Increase the acceleration time ACC, Check the V/f parameter setting, Use UuS (Auto-restart) and UuC (Regenerative power ride-though control), Increase the carrier frequency CF,
Decrease ub setting value, Decrease F50 (stall prevention level) to 130 as a guide, Increase CF (carrier frequency) setting value if it is set at lower value (2kHz or less), Check the cable and the motor for ground faults.
- OC2 / OC2P Description: Overcurrent during deceleration Causes: The deceleration time dEC is too short, or there is a possible ground fault
- OC3 / OC3P Description: Overcurrent during fixed speed Causes: The load fluctuates abruptly, the load is in an abnormal condition, or there is possibly a ground fault.
- OCA1 Description: U-Phase arm short-circuit Causes: a main circuit element is defective on U Phase
- OCA2 Description: V-Phase arm short-circuit Causes: a main circuit element is defective on V Phase
- OCA3 Description:: W-Phase arm short-circuit Causes: a main circuit element is defective on W Phase
- OCL Description: Loaded side overcurrent at start time Causes: The insulation of the output main circuit or motor is defective, The motor has too small impedance, The drive circuit board in the inverter was damaged.
- OCr Description: Dynamic braking element overcurrent 200v 55kW or larger, 400V-90kW or larger Causes: • PB-PA/* circuit is shorted, A resistor with resistance smaller than the minimum allowable resistance is connected, Parameter Pb was set to 1 or 2 without connecting regenerative brake or with wire disconnected (with dynamic braking).
- OH Description: Overheating Causes: The cooling fan does not rotate, The ambient temperature is too high, The vent is blocked up, A heat generating device is installed close to the inverter, The thermistor in the unit is disconnected.
- OH2 Description: Thermal trip (stop command from external device) Causes: An input signal is impressed at control input terminal PTG for optional add-on cards, A thermal trip command (input terminal function: 46 or 47) is issued by an external control device.
- OL1 Description: Inverter Overload Causes: Rapid acceler on is operated, The DC braking amount is too large, The V/f setting is improper, A restart signal is input to the rotating motor after a momentary stop, The load is too large.
- OL2 Description: Motor Overload Causes: The V/f parameter is improperly set, The motor is locked up, Low-speed operation is performed, An excessive load is applied to the motor during operation .
- OLr Description: Dynamic braking resistor overload Causes: Rapid deceleration is operated, Dynamic braking is too large.
- OP1 Description: Overvoltage during acceleration Causes: the input voltage fluctuates abrormaly, the power supply has a capacity of 500KVA or more, A power factor improvement capacitor is opened and closed, A system using a thyrister is connected to the same power distribution line, A restart signal is input to the stop. etc.
- OP2 Description: Overvoltage during deceleration Causes: The deceleration time DEC is too short, The dynamic braking resistor has a considerably large resistance, Pb (Dynamic braking resistor) is OFF, Overvoltage limit operation F305 is OFF, The input voltage fluctuates abnormaly, The power supply has a capacity of 500kVA or more, A power factor improvement capacitor is opened and closed, A system using a thyrister is connected to the same power distribution line.
- OP3 Description: Overvoltage during fixed speed operation Causes: The input voltage fluctuates abnormally, The power supply has a capacity of 500kVA or more, A power factor improvement capacitor is opened and closed, A system using a thyrister is connected to the same power distribution line, The motor is in a regenetive state because the load causes the motor to run at a frequency higher than the inverter output frequency, The undervoltage detection level F625 is too low..
- Ot Description: Overtorque Causes: Overtorque reaches to a detection level during operation, Stall prevention operation was performed continuously for a length of time longer than that set with F452 .
- UC Description: Low current Causes: The outout current decreased to a low-current delecton level during operation.
- UP1 Description: : Voltage drop in main circuit Causes: The input voltage (in the main circuit) is too low, Momentary power failure occurs because undervoltage continues longer than undervoltage detection time F528.
- E Description: Emergency stop
- EEP1 Description: EEPROM error
- EEP2 Description: Initial read error
- EEP3 Description: Initial read error
- EF1 Description: Ground fault
- EF2 Description: Ground fault
- EEPH0 Description: Output phase failure
- Err1 Description: Input phase failure
- Err2 Description: Main Unit RAM fault
- Err3 Description: Main Unit ROM fault
- Err4 Description: CPU Fault
- Err5 Description: Interruption of operation command from external control device
- Err6 Description: Gate Array fault
- Err7 Description: Output current detector error
- Err8 Description: Optional unit fault
- Etn Description: Tuning Error
- Etn1 Description: tuning detection error
- Etn2 Description: Motor constant value error
This one is a work in progress, stand by...