Servo_P_Alpha - GE FVP110 Maintenance Manual

Manual Tuning Guideline

SERVO_P_ALPHA

If the deviation from the set point value exceeds the SERVO_DEADBAND, this function
starts. If 0 is set to SERVO_DEADBAND, this function is invalid.
Figure 92 SERVO_I_SLEEP_LMT and SERVO_DEADBAND
SERVO_P_ALPHA
Tuning range: 0 to 100% (Default: 0%)
Setting this parameter adds more values to the proportional term for a large step
compared to a small step. Use this parameter when a large value cannot be set to the
proportional gain because of the large hysteresis of a value, and the response speed
for a large step is insufficient.
A usual operation in the proportional term covers the deviation only; however, unless 0
is set for this parameter, a value calculated based on the following equation is added, in
addition to the deviation. If 0 is set, this function is invalid.
(Value added to the proportional term) = deviation |deviation| / SERVO_P_ALPHA
You can obtain a quadratic curve in which the proportional term doubles when the
deviation equals the SERVO_P_ALPHA, and the added value is in reverse proportion
to an increase in the value of SERVO_P_ALPHA.
Figure 93 SERVO_P_ALPHA Operation
However, as long as the deviation is more than 10%, the added value is fixed to a value
calculated when the deviation is 10%
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