Toshiba ASD 9 Series Manual page 23

F364 — PID Feedback Deviation Upper Limit sets the maximum amount that the feedback signal
may increase the output signal.
F365 — PID Feedback Deviation Lower Limit sets the maximum amount that the feedback signal
may decrease the output signals.
F366 — PID Feedback Differential (D) Gain sets the degree that the Differential (D) feedback affects
the output signal. The larger the value, the more pronounced the effect of the Differential feedback on
the output signal. The differential gain determines how much the rate of change of the deviation
(difference between the process value and the feedback value) affects the output signal. The larger the
value entered, the more pronounced the ASD response to changes in the feedback value. Setting the
gain excessively high may result in output over-correction and oscillation.
Change in ASD Response with Change in Differential Gain. (P and I gains held constant)
Deviation Change with Time
(Previous Deviation
- Current Deviation)
Output Frequency
• A constant deviation between the set point and the feedback will result in a
constantly increasing output frequency.
• The larger the differential gain, the larger the initial output frequency jump.
F367 — PID Feedback Process Upper Limit sets the Upper Limit when operating in Process PID
mode.
F368 — PID Feedback Process Lower Limit sets the Lower Limit when operating in Process PID
mode.
F369 — PID Control Wait Time delays the start of PID control at startup. After the wait time the ASD
switches to the PID control setup.
F370 — PID Output Upper Limit sets the Upper Limit when operating in Speed PID mode.
F371 — PID Output Lower Limit sets the Lower Limit when operating in Speed PID mode.
F372 — Process Increasing Rate limits the rate at which the output of the ASD may increase for a
given difference in the speed reference and the PID feedback value.
F373 — Process Decreasing Rate limits the rate at which the output of the ASD may decrease for a
given difference in the speed reference and the PID feedback value.
F375 — Number of PG Input Pulses sets the end-of-travel range when using an encoder on a motor-
driven positioning system.
F376 — Number of PG Input Phases determines the type of information that is supplied by the phase
encoder.
F381 — Positioning Completion Range sets the range of accuracy for a Stop command initiated from
the terminal board when the ASD is in Simple Positioning PID mode.
F466 — Speed PID Switching Frequency sets the minimum threshold speed setting at which PID
control may engage or remain engaged if active.
PID Control Manual
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Time
Large Differential Gain
Small Differential Gain
Time
15