EN-22 Display Alarm Fault Meaning Corrective Actions OC Over Current Over Current The Inverter’s output current exceeded the over- current detection level. • Remove the motor and run the Inverter without the motor. • Check the motor for a phase-to-phase short. • Verify the accel/decel times (C1-). • Check the Inverter for a phase-to-phase short at the output. OH Heatsnk Overtemp Heatsink Overheat L8-03 = 0,1 or 2 and the temperature of the Inverter's cooling fin exceeded the L8-02 value. • Check for dirt build-up on the fans or heat- sink. • Reduce the ambient temperature around the drive. • Replace the cooling fan(s).
Inverter's Cooling Fan Stopped L8-03 = 3 or 4 and the temperature of the Inverter's cooling fin exceeded the L8-02 value. OH1 Heatsink Max Temp Heatsink Overheat The temperature of the Inverter’s heatsink exceeded 105 °C. • Check for dirt build-up on the fans or heat- sink. • Reduce the ambient temperature around the drive. • Replace the cooling fan(s). Inverter’s Cooling Fan Stopped OL1 Motor Overload Motor Overload Detected when L1-01 is set to 1,2 or 3 and the Inverter’s I²t value exceeded the motor overload curve.
The overload curve is adjustable using parame- ter E2-01 (Motor Rated Current), L1-01 (Motor Pro- tection Selection) and L2-02 (Motor Protection Time Constant) • Recheck the cycle time and the size of the load as well as the accel/decel times (C1-). • Check the V/f characteristics (E1-). • Check the setting of Motor Rated Current Setting (E2-01). OL2 Inv Overload Inverter Overload The Inverter output current exceeded the Invert- ers’s overload capability • Recheck the cycle time and the size of the load as well as the accel/decel times (C1-). • Check the V/f Characteristics (E1-). • Check if the inverter rated current matches the motor rated current. OS Overspeed Det.
F1-03 = 0, 1 or 2 and A1-02 = 1 or 3 The motor speed feedback (U1-05) exceeded the setting in F1-08 for a time longer than the setting of F1-09 • Adjust the ASR settings in the C5 parame- ter groupt • Check the reference circuit and reference gain. • Check the settings in F1-08 and F1-09 F1-03 = 3 and A1-02 = 1 or 3 The motor speed feedback (U1-05) exceeded the setting in F1-08 for a time longer than the setting of F1-09 OV DC Bus Overvolt (only in stop condi- tio) The DC bus voltage has exceeded the overvolt- age detection level. Default detection levels are: 200 V class: 410 VDC 400 V class: 820 VDC • Increase the deceleration time (C1-02/04) or connect a braking option.
• Check the power supply and decrease the voltage to meet the inverter’s specifica- tions. • Check the braking chopper / resistor. PF Input Phase Loss Input Phase Loss Too big DC bus voltage ripple. Only detected when L8-05=1 (enabled) • Tighten the input terminal screws • Check the power supply voltage PGO PG Open PG Disconnection Detected when F1-02 = 0, 1 or 2 and A1-02 = 1 or 3. Detected when no PG (encoder) pulses have been received for a time longer than the setting in F1-14. • Fix the broken/disconnected wiring. • Supply power to the PG properly. • Check the sequence and if the brake is opened when the inverter starts to increase the speed.
PG Disconnection Detected when F1-02 = 3 and A1-02 = 1 or 3. PG (encoder) pulses have not been received for a time longer than the setting in F1-14.