Farm Fans SCATTERGRAIN FFD-3000VS Installation And Operation Manual page 8

TROUBLE CHECKOUT PROCEDURE & INFORMATION
Motor stalls or runs at 1. LOW VOLTAGE - Check input voltage between terminals 1 and 2 on terminal strip in
very low speed with Vari-speed control box; voltage should not be below 218 VAC; increase voltage to 230
speed control turned on VAC.
to full CW (100) dial set-
ting.
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 marked +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.
1. SHORTED POWER SEMI-CONDUCTORS - Replace SCR control.
Motor runs at high
speed and cannot be
2. FAULTY SPEED CONTROL (POTENTIOMETER) - Move speed control knob to (0)
controlled.
dial setting. Connect DC voltmeter between armature terminals marked +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.
1. LOW VOLTAGE - Check input voltage between terminals 1 and 2 on terminal strip in
Repeated fuse blowing
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.
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