Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 139)

SMC Dialog Plus Controller Special Application Considerations 5-15
Accu-Stop

Two levels of braking torque are applied with the Accu-Stop option.
There is the braking portion that brakes to slow speed, and the slow
speed braking/coast (see Figure 5.12). The level of these braking
currents are adjusted using one rotary digital switch.
The maximum braking torque available from braking to slow speed
and from slow speed to stop is approximately 80–100% of full load
torque of the motor
Using the slow speed starting portion of the Accu-Stop option will
result in the same starting and running torque characteristics as
described in the Preset Slow Speed option.
Figure 5.12 Accu-Stop Option
Energy Saver The Energy Saver is an integral feature of the SMC Dialog Plus
controller. It can be used in applications such as conveyors, material
handling equipment, variable volume air handling units, pumps,
compressors, and various other applications where the motor is
lightly loaded or unloaded for extended periods of time.
Energy Saver Operation
Since the SMC Dialog Plus controller output voltage is under SCR
control at all times, the Energy Saver can automatically decreas
motor power losses by controlling the motor terminal voltage.
The Energy Saving mode is operational when turned on and the motor
is operating at less than full load. As the motor is unloaded, the motor
terminal voltage is reduced. The motor then operates at the optimum
level required to drive a given load without severely affecting speed.
When the load is reapplied, the motor voltage increases. The
controller provides only enough voltage to keep the motor running.
Typical response time from no load to full load is 50 milliseconds.
Full to no load response time to optimum level is typically less than
five seconds.
10 0
Motor
Speed
Braking
(A) Slow Speed
Braking/Coast
(B) Slow Speed
Time (seconds)