Hitachi L200 Manual Do Utilizador

L200 Inverter

Oper

ations

and Monitor

ing

4–41

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 C044, the [OD] terminal
signal turns ON. Refer to

“PID Loop

Operation” on page 4–54

[OD]

Signal

SP, PV

1
0

Setpoint

Process variable

C044

Option

Code

Terminal

Symbol

Function Name

Output

State

Description

Output Deviation for
PID Control

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:

C044

Notes:
•

The default difference value is set to 3%. To change
this value, change parameter C044 (deviation
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
damaging the inverter’s output transistor.

+
–

Example (requires output configuration—
see page

3–47

Inverter output
terminal circuit

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

4–35

and

3–47

AL0

AL2

AL1

Inverter logic
circuit board