Mitsubishi FR - S500 PID action, Reverse action, Increases the manipulated, Decreases, 103

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 process value]

Set point

	Deviation
	Process
P action	value
	Time
D action	Time

REMARKS

PD action is the sum of P and D actions.

3)PID action

The PI action and PD action are combined to utilize the advantages of both actions for control.

REMARKS

The PID action is the sum of P, I and D actions.

PD action Time

	Set point
	Deviation
	Process
P action	value
	Time

Iaction Time

D action Time

y=at2+bt+c

		PID action		Time
4) Reverse action		[Heating]
Increases the manipulated	Set point	+	X>0
variable (output frequency) if			X<0
		-
deviation X = (set point -
		Feedback signal
process value) is positive,
		(Process value)
and decreases the			Deviation	Set point	2
manipulated variable if
deviation is negative.	Cold	up
	Hot	down	Process value

103