Motorola SG 2000 Instruções de Operação descarregar pdf (Página 26)

Bench Setup 3

-5

AT&T SLW2500 Installation and Operation Manual

Power Supply Settings

You can power the SLW2500 from 60 Vac or 90 Vac system supplies. The unit is shipped from

the factory set for 60 Vac (

LO). If your system uses 90 Vac powering, reposition the suitcase

jumper on the dc power supply to the 90 Vac (

HI) position to optimize the supply turn-on voltage

for the higher input range. Note that no damage results if the jumper is not changed. In a 90 Vac

system, changing the jumper ensures that the dc supply does not turn on until the proper input

voltage level is reached. This prevents excessive loading of the cable plant power supply during

turn-on after a power-off situation.

Figure 3-5 illustrates the location of the

LO/HI jumper:

Figure 3-5

SLW2500 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

The dc supply can deliver 4.3 A at

+24 V and 0.850 A at +5 V. Test points are provided for 24 Vdc

and 5 Vdc supplies. Two green LEDs on the power supply indicate the overall health of the nodes

dc power bus. The power supply is factory calibrated for 24 V and should not need output voltage

adjustment; however, R51 is available if required. Figure 3-5 illustrates the location of R51

(

ADJ).

The ac input from the feederline to the power supply must be between 44 Vrms and 90 Vrms

with a line frequency of 50 Hz or 60 Hz. The waveshape of the input voltage must be

quasi-squarewave. The power supply features a self-protection attribute that shuts it down for

instantaneous line voltages higher than 200 V. A precision output regulator protects against

overcurrent and short circuits, thus providing a precise output voltage.

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