User's Manual

Table Of Contents
2–22
PacketMax 5000 Installation and Operation Manual, 10007678 Rev J
Chapter 2. Base Station Components
2.12 PacketMax 5000 Rear Panel
Depending on the user’s needs, the BS could contain two hot-swappable, redundant,
and load-sharing power supplies. One power supply will take over the entire load if
the other one fails. The failed power supply can be removed and a new one installed
while the BS is operating.
2.12.1 Grounding
WARNING: It is critical that users must properly ground their PM 5000 base sta-
tion. Not grounding the PM 5000 BS can cause damage to the PM
5000 or other equipment that may be attached to it.
The BS rear panel contains a ground lug that is used to connect the system to ground.
Aperto recommends that a standard copper insulated wire that is at least 12 gauge
or less be used to ground the PM 5000 chassis.
To properly ground the PM5000 chassis:
1. Use a grounding lug provided in the back of the system.
2. Crimp the copper grounding cable to the base station grounding lug and earth
ground the other side of the cable.
2.12.2 DC Power Connection
A DC-powered PacketMAX 5000 includes two redundant 3-pin terminal blocks on the
rear panel. These terminals are labeled -, +, and GND. DC Power is provided
externally to the base station if DC chassis is being used; and there is no power
supply provided in the chassis.
To apply power to the PacketMAX 5000, screw in securely and connect the 3 leads
from a -48 V DC source that can supply up to 25 Amps to the terminals using 12 AWG
or heavier solid copper wire. For cable lengths greater 10m (30ft) use 10AWG or
heavier solid copper wire.
Since there is a on-off switch; disconnecting the power leads is the standard way to
remove power from the Base Station Unit.
NOTE: Please be sure to verify, using a volt meter, the polarity of the DC
Voltages. Not doing this could result in damage to the system.
NOTE: If you are using DC power to the BS, both power connectors on the
back of the BS have to be connected to power outlets for the power supply
to be redundant. The chassis has two redundant power backplanes and
each of the two DC connectors on the back of he chassis is connected to one
backplane.