Hitachi SJ200 Series manual 168

4–41

SJ200 Inverter

Output Deviation for PID Control

The PID loop error is defined as the magnitude (absolute value) of the difference between the Setpoint (target value) and the Process Variable (actual value). When the error magnitude exceeds the preset value for C044, the [OD] terminal signal turns ON. Refer to “PID Loop Operation” on page 4–54.

SP, PV				Process variable
					Setpoint
	C044
	C044
[OD]		1
			ON			ON
Signal		0

t

Option

Terminal

Function Name

Output

Description

Code

Symbol

State

04

OD

Output Deviation for

ON

when PID error is more than the set threshold for

PID Control

the deviation signal

OFF

when PID error is less than the set threshold for

the deviation signal

Valid for outputs:

11, 12, AL0 – AL2

Example (requires output configuration—

see page 3–46):

Required settings:

C044

Inverter output

OD

Notes:

terminal circuit

• The default difference value is set to 3%. To change

this value, change parameter C044 (deviation

H

O

OI

L

FM

CM2

12

11

level).

•The example circuit for terminal [12] drives a relay

coil. Note the use of a diode to prevent the negative-
	+
going turn-off spike generated by the coil from
	–	RY
damaging the inverter’s output transistor.

Example for terminals [AL0], [AL1], [AL2] (requires output configuration—

see pages 4–35 and 3–46):

Inverter logic	OD
circuit board

		AL0	AL1		AL2
	Power
See I/O specs				Load
	supply
on page 4–6.

Operations Monitoring and