Deif GPC-3 - Page 104

P regulator
0
20
40
60
80
100
0 10 20 30 40 50 60
Kp
Output (%)
4 %
2 %
1 %
0.5 %
Speed range
Because of the characteristic above, it is recommended to use the full range of the output to avoid an unsta-
ble regulation. If the output range used is too small, a small regulation deviation will cause a rather big output
change. This is shown in the drawing below.
1% regulation
deviation
5 20
mA
k
P
10 2515
k
P
A 1 % regulation deviation occurs. With the Kp setting adjusted, the deviation causes the output to change 5
mA. The table shows that the output will change relatively much, if the maximum speed range is low.
Max. speed range Output change Output change in % of max. speed range
10 mA 5 mA 5/10*100 % 50
20 mA 5 mA 5/20*100 % 25
GPC-3 DRH 4189340587 UK PID controller
DEIF A/S Page 104 of 122