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Power Supply Problems
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-48 VDC
Auxiliary
Power
Auxiliary
Power
Unit
Input
AC
INPUT
AUX
POWER
AC
Input
-48 VDC
Power Cord
Ground
Wire
Ferrite
Cores
AUX Power Unit
AC Power Cord
AC
Outlet
Control Unit
AC Power
Cord
Figure 4-3. Replacing an Auxiliary Power Supply
CAUTION:
Do not plug the power supply or the auxiliary power unit into the AC
outlet until you are ready to turn on the system, as described in
“Powering Up
the System” in Chapter 2 of Installation.
Do not attach the power cord(s) to any building surfaces.
Control Unit Problems 4-9