LEESON SCR Thyristor Motor Control - Manual (Page 36)

30 Operation SPEEDMASTER™ OPERATION MANUAL
Line starting and line stopping
Line stopping (removing AC line voltage) is recommended for
infrequent stopping of a drive only. When AC line voltage is
applied to the drive, the motor accelerates to the speed set by
the speed adjust potentiometer. When AC line voltage is
removed, the motor coasts to a stop.
Warning
Decelerating to minimum speed, dynamic braking, inhibit
operation, or coasting to a stop (shorting S1 to S2) is
recommended for frequent starts and stops. Do not use any
of these methods for emergency stopping. They may not
stop a drive that is malfunctioning. Removing AC line power
(both L1 and L2) is the only acceptable method for
emergency stopping.
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Starting and Stopping Methods