Rockwell Automation 150 USE MN/SMC DIALOG + CONTROLLER - Manual (Page 15)

Product Overview 1-5
Energy Saver The Energy Saver feature is typically used in applications where the
motor is lightly loaded or unloaded for extended periods of time.
With the Energy Saver feature enabled, the SMC Dialog Plus
controller continuously monitors motor load with its internal
feedback circuitry. Because SCRs control the output voltage, motor
power losses may be reduced by decreasing the motor terminal
voltage.
Notes: (1) The Energy Saver feature is not available when a bypass
contactor is used.
(2) When Energy Saver and Phase Rebalance are both
enabled, Phase Rebalance takes precedence in operation.
Phase Rebalance With the Phase Rebalance feature enabled, the SMC Dialog Plus
controller continuously monitors the incoming three-phase line
voltage and automatically adjusts the output voltage to balance the
three phase currents drawn by the motor.
Notes: (1) Phase Rebalance requires that the Bulletin 825 converter
module is utilized.
(2) Phase Rebalance is not active during bypass operation.
(3) When Phase Rebalance and Energy Saver are both
enabled, Phase Rebalance takes precedence in operation.
Protection and
Diagnostics The SMC Dialog Plus controller provides the protective and
diagnostic features described below.
Overload
The SMC Dialog Plus controller meets applicable requirements as a
motor overload protective device. Thermal memory provides added
protection and is maintained even when control power is removed. The
built-in overload algorithm controls the value stored in Parameter 11,
Motor Thermal Usage; an Overload Fault will occur when this value
reaches 100%. The programming parameters below provide
application flexibility and easy setup.
Parameter Range
Overload Class Off, 10, 15, 20, 30
Overload Reset Manual – Auto
Motor FLC 1.0 – 999.9 Amps
Service Factor 0.01 – 1.99
!
ATTENTION: During slow speed and/or braking
operations, current waveforms exhibit non-sinusoidal
characteristics. These non-sinusoidal characteristics
inhibit the controller’s current measurement capability.
To compensate for additional motor heating that may
result, the controller uses motor thermal modeling,
which increments motor thermal usage. This
compensation takes place when these options are in use:
Preset Slow Speed, Smart Motor Braking, Accu-Stop,
and Slow Speed with Braking.