Rockwell-automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, User Manual download pdf (Page 33)

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.

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.

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Rockwell-automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, User Manual Page 33