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CAUTION

USE OF THE HI-TORQUE CIRCUITUSE OF THE HI-TORQUE CIRCUIT

USE OF THE HI-TORQUE CIRCUIT

WHEN IT IS NOT REQUIRED ORWHEN IT IS NOT REQUIRED OR

WHEN IT IS NOT REQUIRED OR

EXCESSIVE STARTING TORQUEEXCESSIVE STARTING TORQUE

EXCESSIVE STARTING TORQUE

CAN CAUSE THE MOTOR TO RUNCAN CAUSE THE MOTOR TO RUN

CAN CAUSE THE MOTOR TO RUN

WARM, BE NOISY IN OPERATION,WARM, BE NOISY IN OPERATION,

WARM, BE NOISY IN OPERATION,

AND OPERATE AT REDUCED EF-AND OPERATE AT REDUCED EF-

AND OPERATE AT REDUCED EF-

FICIENCY.FICIENCY.

FICIENCY.

CAUTION

THE I COMP AND WALKING FRE-THE I COMP AND WALKING FRE-

THE I COMP AND WALKING FRE-

QUENCY CIRCUITS ARE INTERAC-QUENCY CIRCUITS ARE INTERAC-

QUENCY CIRCUITS ARE INTERAC-

TIVE AND THEY FUNCTION AS OP-TIVE AND THEY FUNCTION AS OP-

TIVE AND THEY FUNCTION AS OP-

POSING CONTROLS.POSING CONTROLS.

POSING CONTROLS.

Before the I Comp potentiometer is adjusted, the

WALKING FREQUENCY potentiometer should be

turned fully counter clockwise.

6.76.7

6.7

WALKING FREQUENCYWALKING FREQUENCY

WALKING FREQUENCY

Factory CalibrationFactory Calibration

Factory Calibration

Most centrifugal applications do not require high

torque for starting the motor. The WALKING FRE-

QUENCY potentiometer is used to calibrate the

drive’s starting frequency and voltage.

CAUTION

EXCESSIVE CW ADJUSTMENT OFEXCESSIVE CW ADJUSTMENT OF

EXCESSIVE CW ADJUSTMENT OF

THIS POTENTIOMETER CANTHIS POTENTIOMETER CAN

THIS POTENTIOMETER CAN

CAUSE THE DRIVE TO NOT STARTCAUSE THE DRIVE TO NOT START

CAUSE THE DRIVE TO NOT START

WITH A START COMMAND, ORWITH A START COMMAND, OR

WITH A START COMMAND, OR

NOT TO REVERSE IF THE RE-NOT TO REVERSE IF THE RE-

NOT TO REVERSE IF THE RE-

VERSING CIRCUITS ARE ACTI-VERSING CIRCUITS ARE ACTI-

VERSING CIRCUITS ARE ACTI-

VATED.VATED.

VATED.

6.86.8

6.8

V/HZ CALV/HZ CAL

V/HZ CAL

Factory CalibrationFactory Calibration

Factory Calibration

The VOLTS PER HERTZ CALIBRATION potenti-

ometer, when installed, is used to provide precise cali-

bration of the drive’s output V/Hz ratio.

CAUTION

IF THE V/HZ CAL POTENTIOME-IF THE V/HZ CAL POTENTIOME-

IF THE V/HZ CAL POTENTIOME-

TER IS INSTALLED, DO NOT AD-TER IS INSTALLED, DO NOT AD-

TER IS INSTALLED, DO NOT AD-

JUST IT. THIS IS A FACTORY CALI-JUST IT. THIS IS A FACTORY CALI-

JUST IT. THIS IS A FACTORY CALI-

BRATION. IMPROPER CALIBRA-BRATION. IMPROPER CALIBRA-

BRATION. IMPROPER CALIBRA-

TION OF THIS ADJUSTMENT CANTION OF THIS ADJUSTMENT CAN

TION OF THIS ADJUSTMENT CAN

CAUSE IMPROPER DRIVE OPERA-CAUSE IMPROPER DRIVE OPERA-

CAUSE IMPROPER DRIVE OPERA-

TION AND/OR MOTOR DAMAGE.TION AND/OR MOTOR DAMAGE.

TION AND/OR MOTOR DAMAGE.

6.9 STANDARD CALIBRATION SETTINGS6.9 STANDARD CALIBRATION SETTINGS

6.9 STANDARD CALIBRATION SETTINGS

Unless designated otherwise, the following calibration setpoints are typical for these applications.

PotentiometerPotentiometer

Potentiometer

Centrifugal FanCentrifugal Fan

Centrifugal Fan

Centrifugal PumpCentrifugal Pump

Centrifugal Pump

OFFSET minimum speed (as set by minimum speed pot)

GAIN 100% with maximum remote signal

MIN SPEED 10% (Fully CCW) if controlled by EMS circuit min

30% if drive sets min setpoint 35% if drive sets min setpoint

MAX SPEED 100%

MAX EXT SPEED 0% (Fully CCW)

OVERLOAD 105% of output rating

CURRENT LIMIT 110% of output rating

I COMP 0% (Fully CCW)

WALKING FREQ Factory set

V/HZ CAL Factory set

Brand	Graham
Model	1703 Series
Category	DC Drives
Language	English

Graham 1703 Series User Manual

Table of Contents

Questions and Answers:

Graham 1703 Series Specifications