Hitachi SJ300 Series PID Control

3–22

“A” Group: Standard Functions

PID Control	When enabled, the built-in PID loop calculates an ideal inverter output value to cause a loop
	feedback process variable (PV) to move closer in value to the setpoint (SP). The current
	frequency command serves as the SP. The PID loop algorithm will read the analog input for the
	process variable (you specify either current or voltage input) and calculate the output.
	• A scale factor in A075 lets you multiply the PV by a factor, converting it into engineering
	units for the process.
	• Proportional, integral, and derivative gains are all adjustable.
	• Optional – You can assign an intelligent input terminal the option code 23, PID Disable.
	When active, this input disables PID operation. See “Intelligent Input Terminal Overview”
	on page 3–49.
	• See “PID Loop Operation” on page 4–71 for more information.

“A” Function

Run

Defaults

Mode

Units

SRW Display

Func.

Edit

–FE

–FU

–FR

Name

Description

Code

Lo Hi

(EU)

(US)

(JP)

DriveConfiguring

Parameters

A071

PID Enable

Enables PID function,

✘ ✔

00

00

00

—

>A071

PID

two option codes:

SW

OFF

00 PID operation OFF

01 PID operation ON

A072

PID proportional gain

Proportional gain has a

✔ ✔

1.0

1.0

1.0

—

>A072 PID

range of 0.2 to 5.0

P

1.0

A073

PID integral time

Integral time constant has a

✔ ✔

1.0

1.0

1.0

sec.

>A073 PID

constant

range of 0.0 to 3600 seconds

I

0001.0s

A074

PID derivative time

Derivative time constant has

✔ ✔

0.0

0.0

0.0

sec.

>A074 PID

constant

a range of 0.0 to 100 seconds

D

000.00

A075

PV scale conversion

Process Variable (PV) scale

✘ ✔

1.00

1.00

1.00

—

>A075 PID

factor (multiplier), range of

CONV

001.00

0.01 to 99.99

A076

PV source setting

Selects source of Process

✘ ✔

00

00

00

—

>A076 PID

Variable (PV), option codes:

INPUT

OI

00 [OI] terminal (current

input)

01 [O] terminal (voltage

input)

NOTE: The setting A073 for the integrator is the integrator’s time constant Ti, not the gain.

The integrator gain Ki = 1/Ti. When you set A073 = 0, the integrator is disabled.