LEESON SCR Thyristor Motor Control - Manual (Page 38)

32 Operation SPEEDMASTER™ OPERATION MANUAL
S3
S2
S1
RUN
DECEL TO
MIN SPEED
10K OHM
SPEED ADJUST
POTENTIOMETER
CW
Figure 16. Run/Decelerate to Minimum Speed Switch
Decelerating to minimum speed
The circuit shown in Figure 16 may be used to decelerate a
motor to a minimum speed. Closing the switch between S1 and
S2 decelerates the motor from set speed to a minimum speed
determined by the MIN SPD trimpot setting. If the MIN SPD
trimpot is set full CCW, the motor decelerates to zero speed
when the switch between S1 and S2 is closed. The DECEL
trimpot setting determines the rate at which the drive
decelerates. By opening the switch, the motor accelerates to
set speed at a rate determined by the ACCEL trimpot setting.