4-1
4. Hardware Installation

4.1. Connecting Power to the APS Unit

The APS-8/16M is available in both AC and DC powered versions. When
connecting power, proceed as follows:
CAUTION:
• Before attempting to install this unit, please review the warnings
and cautions listed at the front of the user's guide.
• This device should only be operated with the type of power
source indicated on the instrument nameplate. If you are not
sure of the type of power service available, please contact your
local power company.
4.1.1. AC Powered Units
Plug the power cable (supplied with the unit) into the receptacle on the back
panel, and then connect the power cable to an appropriate, grounded outlet.
The APS features a self adjusting power supply that automatically adapts to
power supplies between 100 and 240 VAC. Press the Power Switch ON. The
ON LED should light and the RDY LED should begin to fl ash.
4.1.2. DC Powered Units
The DC terminal block features two bus inputs as shown in Figure 4.1. This
allows the user to connect only one DC power source, or connect two DC
power sources where the second source serves as a backup. When connecting
the APS-8/16M to your DC power source, fi rst remove the protective cover
from the terminal block, attach the wires from the -48V DC power source to
the screw terminals, connect your ground line to the labeled ground screw, and
then replace the protective cover.
Figure 4.1: Terminal Block Assembly (DC Units Only)