Mitsubishi Electronics FR-S500 PID control Pr to Pr, Setting Basic PID control configuration

Operation selection function parameters

2.10.10 PID control (Pr. 88 to Pr. 94 )

The inverter can be used to exercise process control, e.g. flow rate, air volume or pressure.

The voltage input signal (0 to +5V or 0 to +10V) or Pr. 93 setting is used as a set point and the 4 to 20mADC current input signal used as a feedback value to constitute a feedback system for PID control.

POINT

Made valid by turning on the X14 signal. Use Pr. 60 to Pr. 63 (input terminal function selection) to make assignment.

Parameter	Name	Factory	Setting Range	Remarks
		Setting
88	PID action selection	20	20, 21
89	PID proportional band	100%	0.1 to 999%, - - -
90	PID integral time	1s	0.1 to 999s, - - -	Setting is enabled
91	PID upper limit	- - -	0 to 100%, - - -
92	PID lower limit	- - -	0 to 100%, - - -	when Pr. 30 = "1"
93	PID action set point for PU	0%	0 to 100%
	operation
94	PID differential time	- - -	0.01 to 10s, - - -

<Setting>

(1) Basic PID control configuration

		Inverter circuit :
Pr. 93 or Treminal 2			PID operation
	+-
Set point				1
			Kp 1+ Ti	S +Td S
		Terminal 4
		Feedback signal (Measured value)

Motor

Manipulated

variable IM

Kp: Proportion constant Ti: Integral time S: Operator Td: Differential time

(2) PID action overview

1)PI action

A combination of proportional control action (P) and integral control action (I) for providing a manipulated variable in response to deviation and changes with time.

[Operation example for stepped changes of measured value]

Deviation Set point

Measured value

P action

Time

2

FUNCTIONS

REMARKS

	I action
PI action is the sum of P and I actions.		Time

PI action

Time

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