6
TROUBLE
CHECKOUT PROCEDURE & INFORMATION
2. OVERLOAD CONDITION - Turn OFF power at disconnect and lock it OFF; check for
freedom of rotation of thrower blade.
3. FAULTY SPEED CONTROL (POTENTIOMETER) - Move speed control knob to (0)
dial setting. Connect DC voltmeter between armature terminals A and -A on
SCR control. Turn speed control knob CW; needle on voltmeter should increase and be
at 180 VDC when speed control knob reaches (100) dial setting. If voltmeter does not
increase at a rate in relation to the turning of the speed control knob, the potentiometer
may be faulty and the SCR control will need to be replaced. In some cases, just the
potentiometer can be replaced if it is separate from rest of SCR control.
4. LOOSE WIRING CONNECTIONS - Check that all wire connections are secure in vari-
speed control box and motor connection box on outside of Scattergrain cone.
5. WORN BRUSHES IN MOTOR - Have them replaced by a qualified serviceman or
motor repair shop.
6. DEFECTIVE MOTOR - Remove motor and have it checked by a qualified serviceman
or motor repair shop.
Motor runs at high
speed and cannot be
controlled.
1. SHORTED POWER SEMI-CONDUCTORS - Replace SCR control.
2. FAULTY SPEED CONTROL (POTENTIOMETER) - Move speed control knob to (0)
dial setting. Connect DC voltmeter between armature terminals A and -A on
SCR control. Turn speed control knob CW; needle on voltmeter should increase and be
at 180 VDC when speed control knob reaches (100) dial setting. If voltmeter does not
increase at a rate in relation to the turning of the speed control knob, the potentiometer
may be faulty and the SCR control will need to be replaced. In some cases, just the
potentiometer can be replaced if it is separate from rest of SCR control.
Repeated fuse blowing
1. LOW VOLTAGE - Check input voltage between terminals 1 and 2 on terminal strip in
Vari-speed control box; voltage should not be below 218 VAC; increase voltage to 230
VAC.
2. OVERLOAD CONDITION - Turn OFF power at disconnect and lock it OFF; check for
freedom of rotation of thrower blade.
3. LOOSE WIRING CONNECTIONS - Check that all wire connections are secure in vari-
speed control box and motor connection box on outside of Scattergrain cone.
4. WORN BRUSHES IN MOTOR - Have them replaced by a qualified serviceman or
motor repair shop.
5. DEFECTIVE MOTOR BEARING - Have them checked and replaced by a qualified ser-
viceman or motor repair shop.
6. DEFECTIVE ELECTRICAL COMPONENTS - Replace SCR control.
7. DEFECTIVE MOTOR - Remove motor and have it checked by a qualified serviceman
or motor repair shop.
1. LOW VOLTAGE - Check input voltage between terminals 1 and 2 on terminal strip in
Vari-speed control box; voltage should not be below 218 VAC; increase voltage to 230
VAC.
Motor stalls or runs at
very low speed with
speed control turned on
to full CW (100) dial set-
ting.
