Motorola SG 2000 Betriebsanleitung PDF herunterladen (Seite 14)

Overview 2

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AT&T SLW2500 Installation and Operation Manual

Power Supply

The SLW2500 power supply (SG2-PS) is located in the housing lid to optimize heat transfer and

to balance the thermal load between the base and the lid. An umbilical cord connects the

SG2-PS to the base.

You can power the node from either 60 Vac (

LO) or 90 Vac (HI) system power supplies. The unit

is shipped from the factory set for 60 Vac powering. For systems equipped with 90 Vac

powering, the suitcase jumper on the dc power supply can be repositioned to optimize the supply

start-up voltage for the higher input range. A description of this procedure is in Section 3,

“Bench Setup”.

A flexible power-distribution design enables you to power the node from any of the four main RF

ports, as well as, a single dedicated power input port. Using fuses and shunts, you can configure

the node to distribute power to the remaining active ports. It can also be powered from the

power input port while a second power source is passed through on any combination of the main

RF ports.

The power supply circuit includes a heavy-duty, gas-discharge, tube surge protector located on

the amplifier module. You can replace this surge protector with the optional FTEC surge

protector. The FTEC triggers at approximately 230 V and presents a short circuit to the line

during periods of overvoltage. After the ac input voltage returns to normal, the FTEC returns to

its open circuit state. This provides the node with a level of protection against surge currents on

the ac line.

Twenty-ampere fuses are installed at the factory to provide power passing to additional

amplifiers. The fusing options are detailed in Section 3, “Bench Setup”.

Figure 2-4 illustrates the SG2-PS power supply:

Figure 2-4

SG2-PS power supply

SG2-PS

CAUTION

NO USER SERVICEABLE PARTS INSIDE

ASSEMBLED IN MEXICO

SEE INSTALLATION MANUAL FOR SERVICE

VOLTAGES I N EXCESS OF

300 VOLTS AR E PRESENT

UNDER COVER AND MAY

BE PR ESENT AFTER POWER

IS REMOVED

LO HI

24V 5V

ADJ

TEST

POINT

TEST

POINT

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 52 53

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