Mitsubishi Electronics FR-S500 instruction manual PD action

Operation selection function parameters

2)PD action

A combination of proportional control action (P) and differential control action

(D) for providing a manipulated variable in response to deviation speed to improve the transient characteristic.

[Operation example for proportional changes of measured value]

	Set point
	Deviation
	Measured
P action	value
	Time

REMARKS		D action
PD action is the sum of P and D actions.								Time
		PD action						Time
3) PID action
				Set point
The PI action and PD action are
combined to utilize the advantages of							Deviation
both actions for control.		P action	Measured
							Time
		I action
REMARKS							Time
The PID action is the sum of P, I and D actions.		D action					Time
		PID action				y=at2+bt+c
4) Reverse action							Time
		[Heating]
Increases the manipulated
		+	X>0
variable (output frequency) if	Set point
			X<0
deviation X = (set point -		-
measured value) is positive, and		Feedback signal
		(Measured value)
decreases the manipulated
								Set point
variable if deviation is negative.
				Deviation
	Cold	up
	Hot	down			Measured value

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