Rectifier Drops; Surge Arrestors; 48 Vdc Power System - Motorola iDEN Site Controller System Manual

Gen 3 Site Controller System Manual
Rectifier Drops

Surge Arrestors

48 Vdc Power System

68P80801E30-A 5/1/2002
The conduit for the rectifier drops should be sized to support a maximum of
six individual 30 Amp, 240 VAC rectifier circuits. Wire drops to power the
rectifiers must be installed per site plan and should reach within 5' above the
site floor. Mark these wire drops with the appropriate circuit breaker panel
numbers. Terminate the drops in an AC electrical junction box.
Each rectifier requires a single wire drop. The standard configuration
contains two rectifiers. Up to four additional rectifiers may be added at the
customers option. Motorola recommends installation of four separate
rectifier drops to facilitate future expansion requirements.
A Motorola-approved surge arrestor must be installed adjacent to the AC
power panel. Very short wire lengths between the arrestor and the power
panel are required for proper operation.
For sites using a transfer switch, the arrestor must be installed on the panel
side of the transfer switch. Additional arrestors may also be installed at the
customer's option on the line or generator side of the switch.
Motorola has developed a functional specification that can be used to help
select various surge arrestors. This specification is available to all customers
and can be obtained by contacting your iDEN System Manager.
The site controller operates on a DC power system that includes a -48 Vdc
battery system. Motorola offers a DC power system to compliment the site
controller. All references to the DC power system within this manual assume
the use of the Motorola power system; however other systems may be used.
This manual only provides procedures for the -48 Vdc battery system. If
other DC power systems are used, then consult the manufacturer's
documentation supplied with the equipment.
DC Power Reference
The site controller operates from positive ground, 48 Vdc power. Reference
is made throughout this manual to the -48 Vdc (hot) and the DC return
power leads. The hot and return leads are kept isolated from chassis grounds
in the equipment.
Chapter 3 Pre-Installation
Electrical Requirements
3-13