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Product Selection Guide
For further information visit: www.abpowerflex.com or www.ab.com/support/abdrives
Auxiliary Motor Control
The PowerFlex 400 has a built in Auxiliary Motor Control feature. This feature allows operation of up to three (3) line-
started motors in addition to the motor controlled directly by the PowerFlex 400 drive. System output can vary from 0%
(auxiliary motors off and drive-controlled motor at zero speed) to 400% (3 auxiliary motors and drive-controlled motor at full
speed). When Auxiliary Motor Control is enabled, the internal PID controller in the PowerFlex 400 uses a reference and
feedback signal to adjust the speed of the drive controlled motor such that the feedback signal follows the reference
signal. When demand exceeds the first motors capacity, the PowerFlex 400 Auxiliary Motor Control automatically starts an
auxiliary motor. The speed of the drive controlled motor is reduced to account for the auxiliary motors additional output to
the system. If demand continues to increase, the PowerFlex Auxiliary Motor Control starts additional motors using the
same process. When demand decreases, an auxiliary motor is stopped and the PowerFlex Auxiliary Motor Control
increases the speed of the drive controlled motor to account for lost system output. A Motor Interlock input identifies
motors that are out of service and causes them to skipped over to the next available motor.
An AutoSwap function also can be used which allows equal wear to be placed on each motor by periodically swapping the
drive controlled and auxiliary motors. Each motor in the system will over time be connected to the PowerFlex 400 drive and
also directly to the AC line. During an AutoSwap, the motor directly connected to the PowerFlex 400 drive is stopped and
the contactor is opened. The contactor of the next motor that will be controlled by the PowerFlex 400 drive is opened if
running across the AC line. A contactor is closed connecting this motor directly to the PowerFlex 400 drive and is started.
An additional motor is line started if required.
PID Reference
PID Feedback
Three-Phase Power
M2L
M1 M2
M2L
PID Reference
PID Feedback
Three-Phase Power
One External Motor
without AutoSwap
One External Motor
with AutoSwap
M1D
M1 M2
M2DM1D M2L
M1L
M2D
M2L
M1L
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