LEESON NEMA 4X SCR Control: 174107.00 - Manual (Page 29)

23 Application Notes
Decelerating to minimum speed
The switch shown in Figure 8 may be used to decelerate a
motor to minimum speed. Closing the switch between S1 and
S2 decelerates the motor from set speed to 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.
RUN
CLOSE TO
DECEL TO
MIN SPEED
10K OHM
SPEED ADJUST
POTENTIOMETER
CW
S0502
S3 S2 S1
SO502 3-PIN HEADER
Use customer supplied
Molex connector #09-50-3031 to mate
with 3-pin header (SO502) on control board.
Figure 8. Run/Decelerate to Minimum Speed Switch