Mitsubishi Electronics FR-S500 instruction manual 4 I/O signals, Parameter setting

Operation selection function parameters

(4) I/O signals

Signal		Terminal Used	Function	Description
	X14	Depending on	PID control	Turn on X14 to exercise PID control.
Input		Pr. 60 to Pr. 63	selection
	2	2	Set point input	Enter the set point for PID control.
	4	4	Measured value	Enter the 4 to 20mADC measured value
			input	signal from the detector.
	FUP		Upper limit output	Output to indicate that the measured value
				signal exceeded the upper limit value.
	FDN		Lower limit output	Output to indicate that the measured value
Output		Depending on		signal exceeded the lower limit value.
		Pr. 64, Pr. 65	Forward (reverse)	"Hi" is output to indicate that the output
	RL		rotation direction	indication of the parameter unit is forward
				rotation (FWD) or "Low" to indicate that it is
			output
				reverse rotation (REV) or stop (STOP).

•Enter the set point across inverter terminals 2-5 or in Pr. 93 and enter the measured value signal across inverter terminals 4-5.

•To exercise PID control, turn on the X14 signal. When this signal is off, PID control is not exercised.

Item	Entry	Description
		Set 0V as 0% and 5V as 100%.	When "0" is set in Pr. 73 (5V
	Across		selected for terminal 2).
Set point	terminals 2-5	Set 0V as 0% and 10V as 100%.	When "1" is set in Pr. 73 (10V
			selected for terminal 2).
	Pr. 93	Set the set point (%) in Pr. 93.
Measured	Across	4mA is equivalent to 0% and 20mA to 100%.
value	terminals 4-5

(5) Parameter setting

Parameter	Name	Setting	Description
Number
88	PID action	20	For heating, pressure control, etc.	PID reverse action
	selection	21	For cooling, etc.	PID forward action
			If the proportional band is narrow (parameter setting is
			small), the manipulated variable varies greatly with a slight
	PID	0.1 to 999%	change of the measured value. Hence, as the proportional
89	proportional		band narrows, the response sensitivity (gain) improves but
	band		the stability deteriorates, e.g. hunting occurs.
			Gain K = 1/proportional band
		- - -	No proportional control
			Time required for the integral (I) action to provide the
	PID integral	0.1 to 999s	same manipulated variable as that for the proportional
90			(P) action. As the integral time decreases, the set point
	time		is reached earlier but hunting occurs more easily.
		- - -	No integral control.

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