LEESON SCR Thyristor Motor Control - Manual (Page 34)

28 Operation SPEEDMASTER™ OPERATION MANUAL
1. Set the FORWARD/BRAKE/REVERSE switch to the
BRAKE position.
2. Set the speed adjust potentiometer to “0” (full CCW).
3. Apply AC line voltage.
4. Set the POWER switch to the ON position.
5. Set the FORWARD/BRAKE/REVERSE switch to the
desired direction of rotation.
6. Slowly advance the speed adjust potentiometer CW. The
motor slowly accelerates as the potentiometer is turned
CW. Continue until the desired speed is reached.
7. To brake the motor, set the FORWARD/BRAKE/REVERSE
switch to the BRAKE position. To coast the motor to a stop,
set the POWER switch to the OFF position.
8. To reverse direction:
a. Set the FORWARD/BRAKE/REVERSE switch to the
BRAKE position.
b. After the motor comes to a complete stop, set the
FORWARD/BRAKE/REVERSE switch to the desired
direction of rotation.
174105
Warning
Do not change the FORWARD/ REVERSE switch while the
motor is running. The motor must come to a complete stop
before reversing. Changing motor direction before allowing
the motor to completely stop will cause excessively high
current to flow in the armature circuit, and may damage the
drive and/or motor.
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