Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 34)

26 Operation
Figure 13. INHIBIT-RUN Terminals
INHIBIT-RUN
TERMINALS
Coast to a stop using the INHIBIT circuit
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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To coast the motor to a stop without removing power to the drive, jumper
INHIBIT–RUN terminals 1 and 2 (Figure 13). To restart the motor, jumper
INHIBIT–RUN terminals 2 and 3. A single-throw, double-pole switch may
be used as a COAST/RUN switch.
IMPORTANT: Each drive is assembled with INHIBIT–RUN terminals 2
and 3 jumpered. These terminals must be connected for the motor to run.
Certain Reliance Electric drives (regenerative and non-regenerative) coast
to minimum speed when the inhibit terminals are shorted to each other.
IR COMP and CURRENT LIMIT (FWD TQ and REV TQ on regenerative
drives) are still active while the drive is in the inhibit mode.
Frequent regenerative deceleration, regenerative braking, coasting to a
stop, or decelerating to minimum speed produces high torque. This may
cause damage to motors, especially gearmotors that are not properly sized
for the application.