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Parker Hannifin
Chapter 5 Tuning 87
Step 3
Step 3
With SGV equ
al to 2, the
response is fairly well
damped (see plot).
At this point, the SGP
sho
uld be raised again
until oscillation or
excessive overshoot
appears.
Step 4
As we iteratively increase
SGP to 5, ove
rshoot and
chattering becomes
significant (see plot). This
means the SGV gain is to
o
low and/or the SGP is
too
high.
Next, we should try raising
the SGV gain to see if it will
dampe
n out the overshoot
and chattering.
Step 5
After the SGV gain is
raised to 5, the overshoot
was reduced but
chattering is still quite
pronounced. This means
either one or both of the
gains is too high.
The next step should be to
lower the SGV gain firs
t.