Yaskawa G5HHP Drive - Manual (Page 324)

Troubleshooting
9.2.13 If the Motor Rotates Even When Inverter Output is Stopped
9 - 14
J
Oscillation and hunting are occurring with PID control.
D
Check the oscillation cycle and individually adjust the P, I, and D. (Refer to page 7 - 47.)
J
Autotuning not performed during vector control.
D
Vector control is not effective without autotuning. Perform autotuning for motor unit separately or set the
motor constants obtained from calculations.
9.2.13 If the Motor Rotates Even When Inverter Output is Stopped
D
The DC injection braking is insufficient. If the motor continues operating at low speed, without completely
stopping, and after a deceleration 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 time at stop) setting.
9.2.14 If 0 V is Detected When the Fan is Started, or Fan Stalls
D
Generation of 0 V and stalling can occur if the fan is turning when it is started. The DC injection braking
is insufficient when starting.
D
This can be prevented by slowing fan rotation by DC injection braking before starting the fan. Increase
the constant b2-03 (DC injection braking time at start) setting.
9.2.15 If Output Frequency Does Not Rise to Frequency Reference
J
The frequency reference is within the jump frequency range.
D
When the jump frequency function is used, the output frequency does not change within the jump frequen-
cy range.
D
Check to be sure that the jump frequency (constants d3-01 to d3-03) and jump frequency width (constant
d3-04) settings are suitable.
J
The frequency reference upper limit has been reached.
D
The output frequency upper limit is determined by the following formula:
Maximum output frequency (E1-04) × Frequency reference upper limit (d2-01) / 100
D
Check to be sure that the constant E1-04 and d2-01 settings are suitable.
9