Hitachi L100 Manual do Utilizador descarregar pdf (Página 112)

L100 Inverter

Operations

and Monitoring

4–21

Output Deviation for PID Control

The PID loop error is defined as the

magnitude (absolute value) of the differ-

ence between the Setpoint (target value)

and the Process Variable (actual value).

When the error magnitude exceeds the

preset value for C44, the [OD] terminal

signal turns on. Refer to the PID loop

section on page 4–27 for more on PID loop

operation.

NOTE: The example circuit in the table above drives a relay coil. Note the use of a diode

to prevent the negative-going turn-off spike generated by the coil from damaging the

inverter’s output transistor.

Process variable

C44

set

value

[OD]

Signal

time

Setpoint

rror

(SP-PV)

ON ON

C44

Option

Code

Terminal

Symbol

Function Name

Output

State

Description

04 OD Output deviation for

PID control

ON when PID error is more than the set threshold for

the deviation signal

OFF when PID error is less than the set threshold for

the deviation signal

Valid for outputs:

11, 12, AL0 – AL2

Required settings:

C44

Notes:

•

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

this value, change parameter C44 (deviation level).

CM2

1112

H OIO L

Example:

–

Inverter output

terminal circuit

See I/O specs on page 4–5.

Technologies Inc.

Toll Free: voice: 1-877-539-2542 fax: 1-800-539-2542 www.mgitech.com

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