Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 31)

23 Operation
Line starting and line stopping
Line starting and line stopping (applying and removing AC line voltage) is
recommended for infrequent starting and 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.
Automatic restart upon power restoration
All drives automatically run to set speed when power is applied. Wiring a
latching relay into the AC line is one way to prevent automatic restarting
following a power outage.
Starting and Stopping Methods
ATTENTION: For frequent starts and stops, use regenerative
deceleration (shorting RB1 and RB2), regenerative braking (shorting
INHIBIT terminals to each other), coasting to a stop (shorting
INHIBIT–RUN terminals 1 and 2), or decelerating to minimum speed
(shorting S2 to S0). 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.
ATTENTION: Starting and stopping with the inhibit terminal pins does
not disconnect AC power in the stop position. A hardwired AC power
disconnection switch must be mounted in close proximity to the
operator’s start/stop controls. This is required, as the DC3 drive does
not have an armature loop contactor. A single fault like a power device
short may cause motor rotation when in the stop mode. The user is
responsible for assuring safe conditions for operating personnel by
providing suitable guards, audio or visual alarms, or other devices.
Failure to observe these precautions could result in bodily injury.
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