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îš‹ If the Motor Rotates Even When Inverter Output is Stopped
If the motor coasts at low speed after a deceleration to stop has been executed, it means that the DC injection
braking is not decelerating enough. Adjust the DC injection braking as follows:
• Increase the parameter b2-02 (DC Injection Braking Current) setting.
• Increase the parameter b2-04 (DC Injection Braking (initial excitation) Time at Stop) setting.
îš‹ If OV (Overvoltage) or OC (Overcurrent) is Detected When a Fan is
Started, or a Fan Stalls
If a fan is windmilling (already rotating in an airstream) and the Inverter tries to start the motor from zero
speed on OV (DC bus overvoltage) or OC (Overcurrent) might occur. This can be prevented by stopping the
fan rotation using DC injection braking before starting the fan. Alternatively the speed search function can be
used to catch the rotating motor.
îš‹ If Output Frequency Does Not Rise to Frequency Reference
îš„The frequency reference is within the jump frequency range.
When the jump frequency function is used, the output frequency does not change within the jump frequency
range. Check to be sure that the Jump Frequency (d3-01 to d3-03) and Jump Frequency Width (d3-04) settings
are suitable.
îš„The frequency reference upper limit has been reached.
The output frequency upper limit is determined by the following formula:
Freq Ref Upper Limit = Max. Output Frequency (E1-04) × Frequency Reference Upper Limit (d2-01) / 100
Check to be sure that the parameter E1-04 and d2-01 settings are suitable.
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