In the case of V/f control with speed sensor, V/f control with speed sensor and auto torque boost, vector control for
induction motor with speed sensor, or Vector control for synchronous motor without speed sensor and magnetic
pole position sensor, if the problem is not solved by adjusting the function code in Table 4.9-1, adjust the function
code in Table 4.9-2.
In the above control methods, PI regulator is used for speed control. The desired response can be obtained by
adjusting the control constants (PI constants) to match the load inertia. The major function codes to adjust are
shown below.
For details, see Chapter 5 “FUNCTION CODES” and Chapter 6 “TROUBLESHOOTING.”
Table 4.9-2
Function
code
Name How to adjust
IM PG V/f
IM w/ PG
PM
d
01
Speed control 1
(Speed command filter)
If an excessive overshoot or undershoot occurs for a
speed command change, increase the filter constant.
If motor response is slow for a speed command change,
decrease the filter constant.
Y
d
02
Speed control 1
(Speed detection filter)
If ripples are superimposed on the speed detection signal
so that the speed control gain cannot be increased,
increase the filter constant to obtain a larger gain. It is not
necessary to change the factory default normally.
Y
d
03
Speed control 1
P (Gain)
If hunting is caused in the motor speed control, decrease
the gain. If speed mismatch or excessive speed deviation
(
ere
) occurs because the motor response is slow,
increase gain.
Y
d
04
Speed control 1
I (Integral time)
If speed mismatch or excessive speed deviation (
ere
)
occurs because the motor response is slower, decrease
the integration time.
If the load inertia is large, increase the integration time.
Y
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