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Epsilon Eb Digital Servo Drive Installation Manual
Figure 12: Epsilon Auxiliary Power Supply Wiring Diagram
Alternate Power Supply Wiring
An Alternate Power Supply (APS) allows the drive to retain motor position information and
serial communications when the main AC power supply is disconnected. You must reset the
drive, either using the reset button or a reset input, after AC power is re-applied if the backup
supplies have been active.
Enabling APS power is done by sliding open the access panel on the side of the drive. Then
move the jumper into the APS position using needle nose pliers.
Use static control procedures when handling the jumper inside the drive case.
The APS input is isolated from all other circuits on the Epsilon drive including the DC bus,
logic and I/O. This permits you to use one common 24 VDC power supply for multiple drives
without concern for ground loops and noise coupling between drives. The APS connection
will generate some high frequency ripple (.25 Amps at 80 khz) on the APS power lines. This
may disturb sensitive equipment that shares the same power supply.