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G R A H A M M O T O R S A N D C O N T R O L S V A R I S P E E D
®
A 2 0 0 0R E L I A B I L I T Y + C O M P A T I B I L I T Y S I N C E 1 9 3 5
Control Features
Options
Application Data
Operating Conditions
Control Ratings Chart
Mounting
Dimensions
Installation and Wiring
Typical Wiring Diagram
Schematic (Block Diagram)
Installation and Wiring continued
Component Location
Start-Up Procedure
Set-Up Procedure
Recommended Fuse Chart
Trouble Shooting Guide
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TABLE OF CONTENTS
Motor will not run:
1. Make sure power LED is lit. If not, make sure disconnect fuses
or circuit breaker in line are okay.
2. Check line fuse. If open, replace. (See Fuse Chart)
3. Make sure “RUN” switch is on. (RUN LED should be lit.)
4. Be sure speed pot is not set to zero.
5. Unit is in current (torque limit). Check I-LIM LED (if lit, this
indicates that I-LIM pot is set too low or motor is overloaded).
6. With power removed from unit and motor leads disconnected,
check for worn or improperly seated brushes.
7. Defective control.
Fuse blowing:
1. Improper wiring.
2. Motor brushes worn or improperly seated.
3. Motor load is too heavy. Check for machine “jam-up” or
excessive load.
4. Defective control. If the control has failed, always check the
motor and wiring for short circuits and grounding before replacing
the control.
No speed control:
1. Speed pot or wiring defective.
2. Control not set up properly. (See Set-up Procedures)
3. Defective Control.
Motor will not run at 1725 RPM:
1. Improper setting of MAX speed trim pot. (Range trim pot
TROUBLE SHOOTING GUIDE
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