88
APEX615n Installation Guide
Step 5
After the SGV gain is raised to 2.6, 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 first.
SGP = 105
SGV = 2.6
Step 6
Lowering the SGV gain to 2.3 does not help
reduce the chattering by much.
Therefore, we should lower the SGP gain
until chattering stops.
SGP = 105
SGV = 2.3
Step 7
Chattering stops after reducing the SGP gain
to 85. However, the overshoot is still a
little too high.
The next step should be to try raising the
SGV to damp out the overshoot.
SGP = 85
SGV = 2.3
Step 8
After raising the SGV gain to 2.4, overshoot
is reduced a little, but chattering reappears.
This means the gains are still too high.
Next, we should lower the SGV gain until
chattering stops.
SGP = 85
SGV = 2.4
Step 9
After lowering the SGV gain to 2.2 (even
less than in Step 7—2.3), chattering stops.
Next we should lower the SGP gain.
SGP = 85
SGV = 2.2
Step 10
Overshoot is reduced very little after
lowering the SGP gain to 70. (The SGV
gain might have been lowered too much in
Step 9.)
Next, we should try raising the SGV gain
again until the overshoot is gone.
SGP = 70
SGV = 2.2
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