Toshiba G7 Series Applications Workbook page 30

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Trim Pot

Introduction

This guideline will outline a G7 feature that allows a speed reference to be "fine tuned" on the fly via

another reference, called the "trim". All trim sources mentioned below allow addition to the regular

reference; (+/-) trim is available only when using the RX terminal and its associated bias and gain

have been appropriately programmed. Speed References Allowed: Panel input, 4-20mA, speed pot

or voltage source, preset speed, or communication board. Trim Sources Allowed: Speed pot (RX

terminal, +/- trim possible, RR terminal, + trim only), 4-20mA (VI/II, + trim only), or panel (+ trim only).

Other trim sources can be found in Frequency Override Additive Input (F660). This example will

illustrate the connections and programming necessary to follow a 4-20mA speed reference while

trimming the reference with a (+/-) trim from a pot connected to the RX terminal.

Connections

TERMINAL STRIP

4-20 mA Source

Speed Pot

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

H7 series