Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 33)

25 Operation
INHIBIT TERMINALS
Figure 12. Inhibit Terminals
Regenerative braking 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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Short the INHIBIT terminals to regeneratively brake the motor (see
Figure 12 for INHIBIT terminal location). Reopening the INHIBIT
terminals causes the motor to accelerate to set speed.
The INHIBIT terminals bypass both the MIN SPD circuit and the
deceleration circuit. This causes the motor to stop rapidly when the
INHIBIT terminals are shorted. Braking torque is determined by the
opposite-direction torque setting.
Twist inhibit wires and separate them from other power-carrying wires or
sources of electrical noise. Use shielded cable if the inhibit wires are
longer than 18 in. (46 cm). If shielded cable is used, ground only one end
of the shield to earth ground. Do not ground both ends of the shield.