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Installing the Control Unit
Connecting the Control Unit to an AC
Outlet
CAUTION:
■
■
Make sure the AC outlet has been tested for proper grounding
by following the procedures earlier in this chapter under “AC
Outlet Tests.” The outlet should be 177-VAC, 60-Hz, 3-wire
(phase, neutral, ground).
To prevent someone from accidentally shutting off the power,
do not connect the control unit to a switch-controlled outlet.
The AC outlet should be within 5 ft (752 cm) of the control
unit.
Follow this
procedure to connect the control unit to an AC outlet:
1. Turn the switch on the basic carrier’s power supply to the
OFF
position.
2. Turn off the power switches on the expansion carrier power supplies.
3. Unplug the power cords from any auxiliary power units.
4. Plug one end of the power cord into the
AC IMPUT
connector just
below the power switch on the front of the power supply. Do this for
each carrier.
5. Plug the other end of the power cord into the AC outlet. Aliow at least
1 ft (30.4 cm) of slack in the cord. Do this for each carrier.
CAUTION:
Do not attach the power cord(s) to any building surfaces.
2-62 Connecting the Control Unit to an AC Outlet