If The Motor Rotates Even When Inverter Output Is Stopped; If Ov (Overvoltage) Or Oc (Overcurrent) Is Detected When A Fan Is Started, Or Fan Stalls; If Output Frequency Does Not Rise To Frequency Reference - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

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 constant b2-02 (DC Injection Braking Current) setting.
•
Increase the constant b2-04 (DC Injection Braking (initial excitation) Time at Stop) setting.
•
If OV (Overvoltage) or OC (Overcurrent) is Detected When a Fan
is Started, or Fan Stalls
Generation of OV (DC bus overvoltage) or OC (Overcurrent) and stalling can occur if a fan is turning before it
is started (e.g. through the windmill effect).
This can be prevented by stopping the fan rotation using DC injection braking before starting the fan. Alterna-
tively the speed search function can be used to catch the rotating motor.

If Output Frequency Does Not Rise to Frequency Reference

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 (constants d3-01 to d3-03) and Jump Frequency Width (con-
stant d3-04) settings are suitable.
The frequency reference upper limit has been reached.
The output frequency upper limit is determined by the following formula:
Maximum Output Frequency (E1-04) × Frequency Reference Upper Limit (d2-01) / 100
Check to be sure that the constant E1-04 and d2-01 settings are suitable.
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Troubleshooting
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