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BASIC TROUBLESHOOTING
This paragraph contains a basic list of symptoms of an improperly functioning control.
Included in the list are possible causes and corrective measures for each symptom
described.
CONTROL APPEARS TO BE DEAD:
A. Terminals TB2-5 and –5A on the main PC board not jumpered together - install
either a jumper or the Motor Thermostat between these terminals.
B. No AC power - apply AC power and measure L1 and L2 for correct voltage.
C. Blown line fuses - replace line fuses.
D. Loose connections -turn off AC power and tighten connections.
E. Control incorrectly wired - recheck all wiring.
F. Defective Start/Stop switch, component on main PC board, or rectifier cube -
replace bad components as required. ( See Critical Components )
G. Speed potentiometer set to zero - slowly advance from zero to begin motor rotation.
LINE FUSES BLOW OR MAIN CIRCUIT BREAKER TRIPS WHEN APPLYING AC POWER:
A. Control is wired to AC voltage exceeding control rating -rewire control to proper AC
voltage or use step-down transformer.
B. Rectifier cube, field diodes on main PC board, motor winding or suppressor network
shorted, or a short to ground is present - locate and remove short.
C. Improper wiring or jumper programming during installation.
D. Defective main PC board component - replace as required. (See Critical
Components )
E. Motor shaft jammed - determine cause and correct.
F. Excessive carbon dust from brushes in motor - determine cause and correct.
FUSES BLOW WHEN SPEED POTENTIOMETER IS ADVANCED FROM ZERO:
A. Motor is overloaded - reduce load as required.
C. Motor is defective - consult motor instruction manual and repair or replace motor as
required.
MOTOR DOES NOT REACH FULL SPEED:
A. Motor is overloaded - correct overload condition.
B. Maximum Speed potentiometer (MAX) is set too low -adjust MAX potentiometer
clockwise.
C. Low AC line voltage (more than 10% below nominal) -check AC line voltage and
correct.
D. Incorrect jumper programming of JP2 - follow programming procedure
E. Defective rectifier cube - replace as required. (See Critical Components )
F. Motor brushes worn - replace as specified in motor instruction manual.
BEFORE PROCEEDING WITH ANY MAINTENANCE OR TROUBLE-SHOOTING
ACTIVITY, ALL POWER SOURCES MUST BE DISCONNECTED.
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