ST500 | Err.02 – what does this message mean and what can be done?

If the error message Err.02 appears on the frequency inverter’s display, an overcurrent has occurred during the acceleration phase.

Causes:

  • Acceleration ramp is set too short (F0.13)
  • Manual torque boost or U/f curve is improperly set (FA.00, F4.01)
  • Motor voltage is set too low (b0.02)
  • Short circuit in or near the motor
  • Motor parameters missing for vector control (b0.00 to b0.10)
  • Motor was already running before start
  • Sudden increase in motor load during acceleration
  • Inverter’s rated power is too low

Solutions:

  • Adjust parameter F0.13 to extend the acceleration ramp
  • Modify torque settings via parameters FA.00 to FA.07
  • Reduce manual torque boost via parameter F4.01
  • Set motor voltage correctly according to the nameplate using parameter b0.02, considering star/delta configuration
  • Check motor and connections for short circuits
  • Set parameters b0.00 to b0.10 to enable vector control (see motor parameter FAQ)
  • Ensure the motor is at a standstill before restarting
  • Reduce sudden load changes during acceleration or use an inverter with higher output power
  • If the inverter’s rated power is insufficient, use an inverter with higher output power
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