Toshiba G7 Series Applications Workbook page 9

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Introduction

The built-in PID of the G7 can be used to maintain a constant process variable such as flow,

pressure, temperature, and level. In the example below, the drive is used to vary the speed of the

motor/pump to maintain a constant pressure at the output of the pump. As the valves on the output of

the pump are opened, the pressure goes low. The drive senses this via a 4-20 mA feedback signal

and speeds up to increase pressure up to the desired level. The drive will slow the motor/pump down

as the valves close. The rate at which the drive responds to changes is adjustable via three

parameters (Proportional Gain, Integral Time, and Differential Time) and will have to be field-tuned.

Later in this guideline, PID applications will be discussed in general.

Connections

D/A

Check your transducer's schematic for connection information. The above diagram is typical for a loop-powered transducer.

Separately powered isolated transducers feed into the 'II' and "CC" terminals. If your transducer is not isolated, order an isolated

input board. The inputs to the standard G7 are not isolated; do not connect the 'CC' terminal to ground.

For additional assistance, please contact Toshiba Adjustable Speed Drive Marketing Dept. at (800) 872-2192

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PID Control

MOTOR

P24

PUMP

Area in which constant

pressure is desired

4-20 mA feedback

Output Flow

VALVES

Transduce

H7 series