Chapter 5 Parameter Introductions
http://www.acdrive-china.com
161
◆
|AI1-AI2|: Sub the PID feed analog input signal and the PID feedback input signal, the
absolute value is treated as the final feedback value. This function can be used
to
control temperature difference, pressure difference and so on.
P7.02 Analog PID digital feed
Range: 0.0
～
999.9
【
0.0
】
Note:
◆
When analog feedback is used (P7.01=0~8), this function can realize digital setting of
reference by keyboard. The setting must match the range of the actual physical value.
P7.03 Speed PID feed
Range: 0
～
24000rpm
【
0
】
Note:
◆
If PG pulse feedback is used (P7.01=9), the speed reference can be set by keyboard. If
the range of speed PID input over 10000, the keyboard will display as “1000”.
P7.05 PID proportional gain (KP)
Range: 0.1
～
9.9
【
1.0
】
P7.06 PID integration time
Range: 0.00
～
100.0s
【
10.00s
】
P7.07 PID differential time
Range: 0.00
～
1.00s
【
0.00s
】
Note:
◆
The proportional gain (KP) is the parameter that decides the sensitivity of P action in
response to the deviation. The bigger the proportional gain KP is, the more sensitive
the system acts and the faster the ac drive responses. However, oscillation may easily
occur and regulation time extends. When KP is too big, the system tends to instability.
When KP is too small, the system will slow, and responses lag.
◆
Use integration time to decide the effect of integral action. The longer the integration
time, the slower the response, and the worse the ability of control external disturbance
variation. The smaller the integration time is, the stronger the integral take effect. The
smaller integration time can eliminate the steady state error and improve control
precision, fast response. However, oscillation may easily occur, and the system
stability decrease, if the integration time is too small.
◆
Differential time define the effect of differential action. The bigger differential time
can attenuate the oscillation caused by P action more quickly when deviations occurs
and short the regulation time. However, if differential time is too big, oscillation may
occur. If the differential time is small, the attenuation effect will be small when
deviations occur and the regulation time is longer. Only the right differential time can
reduce regulation time.
P7.08 PID delay time constant
Range: 0.00
～
25.00s
【
0.00s
】
Note:
◆
P7.08 set the output frequency delay time of PID.
P7.09 Residual margin
Range: 0.0
～
999.9
【
0.2
】
