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Installing the Auxiliary Power Unit
Installing the Auxiliary Power Unit
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The Control Unit Diagram on the back of Form 1, System Planning, indicates
whether an auxiliary power unit is required for the carrier that you are
installing.
NOTE:
Use the 9024 auxiliary power unit for new installations. You can continue to
use a previously installed 335A auxiliary power unit, as long as no new
telephones or modules are added to the carrier.
To install an auxiliary power unit, follow the steps below. Refer to Figure 2-8
throughout this procedure.
Turn off the switch on the power supply.
Mount the auxiliary power unit on a surface (preferably the backboard)
within 2 ft. (61 cm) of the control unit.
Plug the power unit line cord into the AUX POWER INPUT jack on the
power supply.
Plug the other end of the line cord into the AUX POWER jack on the
auxiliary power unit.
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” later in this chapter.
If the system is backed up by an Uninterruptible Power Supply (UPS),
connect the auxiliary power to the UPS.
Do not attach the power cord(s) to any building surfaces.
Use only the power unit line cord supplied with the auxiliary power unit.
An incorrect cord will damage the power supply and may damage
modules.
Installing the Control Unit 2-25