Motorola STARLINE SERIES Instructions d'exploitation télécharger pdf (Page 17)

2-6 Overview

BLE*/* Installation and Operation Manual

Power Supply

The BLE*/* power supply is a separate circuit board mounted to the underside of the amplifier

module and is capable of 60 Vac or 90 Vac powering. The power supply provides a regulated

24 Vdc output over an ac input between 38 Vrms and 90 Vrms with a line frequency from 50 Hz

through 60 Hz. Potentiometer R25 adjusts the output voltage to 24 Vdc, however, this is set at

the factory and field adjustment is not recommended.

Figure 2-6 illustrates the components on the power supply:

Figure 2-6

BLE*/* power supply

P2-3

P2-2

P2-1

C24

C25

C26 C2

C12

C10 J1

C22

R25 C11

C17

R16

SURGE PROTECTOR

R25

Surge protector

or FTE

LO/HI

selector

The power supply also contains a two-position

LO/HI selector that sets the start-up voltage for

38 Vac or 55 Vac. The BLE*/* is shipped with the selector in the

LO position which is the

standard configuration. The selector should be switched to the

HI position only for a 90 Vac

system. This sets the start-up voltage at 55 Vac. Because this is only 5 V below 60 Vac, it is not

practical in a 60 Vac system. There is no damage to the amplifier if the selector is not changed

from the standard

LO setting. However, changing the selector ensures that the dc supply does

not turn on until the proper input voltage, 38 Vac or 55 Vac, is reached. This prevents excessive

loading of the system power supply during turn-on after a system shutdown.

You must remove the power supply cover to access the selector illustrated in Figure 2-6.

Section 3, “Amplifier Setup” explains changing the setting of this selector to meet system

requirements.

The power supply includes a heavy-duty gas discharge tube that you can replace with the

optional fast-transfer electronic-crowbar (FTEC) surge protector. The FTEC is a crowbar circuit

that fires at approximately 245 V and presents a short circuit to the line during periods of

overvoltage. After the ac input voltage returns to normal, the FTEC resumes its open state.

The factory-installed 20-ampere fuse, illustrated in Figure 2-8, provides power-passing to

additional line extenders.

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Motorola STARLINE SERIES Instructions d'exploitation Page 17

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