Toshiba VF-AS1 Alarms and Fault Codes

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Toshiba VF-AS1 Alarms and Faults
possible 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...

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