Instruction manual

General Description

The Carotron FR1000-000 and FR3500-000 are designed to provide current

regulation for DC motor or generator field windings rated from .1A-10A and

10A to 35A respectively. These units are easily set up as constant horsepower

“crossover” controls to give a motor extended speed operation. Also, they can

be set up as alternative field current supplies in single or multiple motor

applications.

These units will operate from a single-phase 50/60 Hz line between 230 and

460 VAC, + 10 %, with no line voltage programming required. They have

intuitive set-up with three basic adjustments: MIN CURRENT, MAX

CURRENT and CROSSOVER set point. A built-in field current ammeter with

0.1-ampere resolution further simplifies set-up.

A built-in independent DC tachometer scaling circuit is included. When the

FR1000-000 and FR3500-000 are used in a constant horsepower application

with CAROTRON drives from the CHOICE or ELITE series, the extended

speed tachometer voltage can be easily scaled to “fit” the standard 7 volt-per-

thousand tachometer input range on these models. This alleviates the need to

calculate resistor values to be added for scaling the tachometer input for

models that do not have an adjustable tachometer input range.

Current control resolution is optimized with a programming jumper that selects

a 2,4,6,8,10 or15, 20, 25, 30 or 35 ampere range. There’s no need to calculate

the number of turns of wire to thread through a current sensor.

Fuses are provided for protection of the components in both the low voltage

power supply and high current section.