Rockwell Automation DC3R Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 35)

27
The circuit shown in Figure 14 may be used to decelerate a motor to a
minimum speed. Closing the switch between S2 and S0 decelerates the
motor from set speed to a minimum speed determined by the MIN SPD
trimpot setting. If the MIN SPD trimpot is set full CCW, the motor
decelerates to zero speed when the switch between S2 and S0 is closed.
The DECEL trimpot setting determines the rate at which the drive
decelerates. Set the switch to the RUN position to accelerate the motor to
set speed at a rate determined by the ACCEL trimpot setting.
Operation
Decelerate to minimum speed
Figure 14. Run/Decelerate to Minimum Speed Switch
(shown with bidirectional speed adjust potentiometer connection)
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.
ƽ