Hitachi SJ700-2 OI-L + O2, OI + O2, Operation targets include + O2 Input to the OI terminal

Chapter 4 Explanation of Functions

(2)PID operation

1)P operation

The proportional (P) operation stands for the operation in which the change in operation quantity is in proportion to the change in target value.

	Change in steps		Linear change
Target value		Large		Large
		A072
				A072
Operation quantity		Small		Small

2) I operation

The integral (I) operation stands for the operation in which the operation quantity increases linearly over time.

Target value	Small	Small
	A073	A073
Operation quantity	Large	Large

3) D operation

The derivative (D) operation stands for the operation in which the operation quantity changes in proportion to the rate of change in the target value.

Target value	Large	Large
	A074	A074
Operation quantity	Small	Small

The PI operation is a combination of the P operation 1) and I operation 2). The PD operation is a combination of the P operation 1) and D operation 3). The PDI operation is a combination of the P operation 1), I operation 2), and D operation 3).

(3) PV source setting

Select the terminal to be used for the feedback signal with the PV source setting function (A076).

The terminal to input the target value follows the frequency source setting (A001). The terminal selected by the PV source setting (A076) is excluded.

If the control circuit terminal block ("01") has been specified for frequency source setting "A001", the setting of AT selection (A005) is invalid.

The table below shows how the PID target value is selected according to the setting of "A006" when the analog input is selected by the PV source setting and the control circuit terminal block ("01") is specified for "A001".

PV source setting (A076)			PID target value
		A006=00	A006=01			A006=02	A006=03
00 (OI-L)		O +	O2			O + O2	O
		(non-reversible)				(reversible)
01 (O-L)		OI + O2				OI + O2	OI
		(non-reversible)				(reversible)
	Operation targets include the	O + O2				O + O2	O
	input to the OI terminal.	(non-reversible)				(reversible)
10 (operation
	Operation targets include the	OI + o2				OI + O2	OI
result)	input to the O terminal.	(non-reversible)				(reversible)
	Operation targets are the inputs				O2
	to the OI and O terminals.			(reversible)

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