Teco VFD fault codes
OC (Overcurrent):
+ Description: The output current of the inverter exceeds the overcurrent level (approximately 200% of the inverter's rated current).
+ Possible Causes:
+ Acceleration time is too short.
+ Contactor present at the inverter output side.
+ Use of a special motor or the capacity applied is greater than the inverter's rated value.
+ Short circuit or ground fault.
+ Solutions:
+ Extend the acceleration time.
+ Check the motor wiring.
+ Disconnect the motor and try running the inverter without it.
SC (Short Circuit):
+ Description: There is a short circuit or ground fault in the inverter output.
+ Possible Causes:
+ Short circuit or ground fault.
+ Motor insulation is damaged.
+ Wire damage or deterioration.
+ Solutions:
+ Check the motor wiring.
+ Disconnect the motor and try running the inverter without it.
GF (Ground Fault):
+ Description: The current to ground exceeds 50% of the inverter's rated output current (when GF function is enabled).
+ Possible Causes:
+ Motor insulation is damaged.
+ Wire damage or deterioration.
+ Inverter DCCT sensors defect.
+ Solutions:
+ Replace the motor.
+ Check the motor wiring.
+ Disconnect the motor and try running the inverter without it.
+ Check the resistance between cables and ground.
+ Reduce the carrier frequency.
OV (Overvoltage):
+ Description: The DC bus voltage exceeds the OV detection level (410Vdc for 200V class, 820Vdc for 400V class, with adjustments based on input voltage settings).
+ Possible Causes:
+ Deceleration time set too short, causing regenerative energy to flow back from the motor to the inverter.
+ The inverter input voltage is too high.
+ Use of power factor correction capacitors.
+ Excessive braking load.
+ Braking transistor or resistor is defective.
+ Speed search parameters set incorrectly.
+ Solutions:
+ Increase the deceleration time.
+ Reduce the input voltage to comply with the input voltage requirements or install an AC line reactor to lower the input voltage.
+ Remove the power factor correction capacitor.
+ Use a dynamic braking unit.
+ Replace the braking transistor or resistor.
+ Adjust the speed search parameters.
UV (Under Voltage):
+ Cause: DC bus voltage is lower than the UV detection level or the pre-charge contactor is not active while the inverter is running.
+ Solutions: Check the input voltage, wiring, and power source. Replace the pre-charge contactor or control board/inverter if necessary.
IPL (Input Phase Loss):
+ Cause: Phase loss at the input side of the inverter or input voltage imbalance.
+ Solutions: Check the main wiring connection, terminal screws, and input voltage stability. Replace the circuit board or inverter if necessary.
OPL (Output Phase Loss):
+ Cause: Phase loss at the output side of the inverter.
+ Solutions: Check the output wiring and screws. Ensure the motor and inverter ratings are compatible.
OH1 (Heatsink Overheat):
+ Cause: The temperature of the heat sink is too high.
+ Solutions: Improve cooling around the inverter, replace the cooling fan, reduce the carrier frequency, and reduce the load.
OH4 (Motor Overheating):
+ Cause: The surrounding temperature of the motor is too high or the input of the PTC exceeds the overheat protection level.
+ Solutions: Check the surrounding temperature of the motor and ensure the wiring of the MT and GND terminals is correct.