AGC Designer’s Reference Handbook
DEIF A/S Page 126 of 168
Speed range
Because of the characteristic above it is recommended to use the full range of the output to
avoid an unstable 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.
A 1% regulation deviation occurs. With the KP setting adjusted, the deviation causes the output
to change 5mA. The table shows that the output of the AGC changes relatively much, if the
maximum speed range is low.
Max. speed
range
Output change Output change in % of
max. speed range
10mA 5mA 5/10*100% 50
20mA 5mA 5/20*100% 25
1% regulation
deviation
5 20
mA
k
P
10 25 15
k
P