Rockwell Automation Liqui-Flo 1.5 AC Power Modules V1.2 - Manual (Page 49)

Wiring the AC Line I/O Board Terminal Block 7-5
7.4 Stopping the Drive
Depending upon the requirements of the application, the LiquiFlo drive can be
programmed to provide either a coast-to-rest or a ramp-to-rest operational stop
without physical separation of the power source from the motor.
A coast-to-rest stop turns off the transistor power device drivers.
A ramp-to-rest stop fires the transistor power device drivers until the motor comes to a
stop, and then turns off the power devices.
The user can also program zero speed with power maintained to the motor, but in this
condition, the drive is not actually stopped.
In addition to the operational stop, the user must provide a hardwired emergency stop
external to the drive. The emergency stop circuit must contain only hardwired
electromechanical components. Operation of the emergency stop must not depend on
electronic logic (hardware or software) or on the communication of commands over an
electronic network or link.
Note that the user-installed hardwired emergency stop may be used at any time to
stop the drive.
!
ATTENTION: The user must provide an external, hardwired emergency
stop circuit outside of the drive circuitry. This circuit must disable the
system in case of improper operation. Uncontrolled machine operation
may result if this procedure is not followed. Failure to observe this
precaution could result in bodily injury.