Motorola SG 2000 ユーザーズマニュアル
2 - 4 O v e r v i e w
SG 20 00 Ins tal la tion and O pera tion M anua l
P o we r Sup p ly
The SG 2000 power supply (SG2-PS2) is located in the housing lid to optimize heat transfer and to
balance the thermal load between the base and the lid. For high reliability or redundancy
applications, two power supplies can be used. An umbilical cord connects the SG2-PS2 to the lid
motherboard (LIDB).
balance the thermal load between the base and the lid. For high reliability or redundancy
applications, two power supplies can be used. An umbilical cord connects the SG2-PS2 to the lid
motherboard (LIDB).
A flexible power-distribution design enables you to power the node from any of the four RF ports.
Using fuses and shunts you can configure the node to distribute power to the remaining active ports.
You can also power the node locally through the ac only port (port 2) while a second cable-plant
power supply loops through the other two main RF ports.
Using fuses and shunts you can configure the node to distribute power to the remaining active ports.
You can also power the node locally through the ac only port (port 2) while a second cable-plant
power supply loops through the other two main RF ports.
The power supply 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 over
voltage. 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. The same protector
is used for both supplies unless the split ac-feed option is implemented; then, the secondary or
redundant power supply is protected by a conventional heavy-duty gas discharge tube.
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 over
voltage. 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. The same protector
is used for both supplies unless the split ac-feed option is implemented; then, the secondary or
redundant power supply is protected by a conventional heavy-duty gas discharge tube.
The 20-ampere fuses are installed at the factory to provide power passing to additional amplifiers.
Section 3, “Bench Setup,” discusses fusing options that are also diagrammed in Figure 3-1.
Figure 3-2 illustrates the location of the fuses.
Section 3, “Bench Setup,” discusses fusing options that are also diagrammed in Figure 3-1.
Figure 3-2 illustrates the location of the fuses.
The SG 2000 optical node can be powered from either 60 Vac or 90 Vac 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. Section 3, “Bench Setup” provides a description of this
procedure.
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. Section 3, “Bench Setup” provides a description of this
procedure.
Figure 2-4 illustrates the SG2-PS2 power supply:
F i g u r e 2 - 4
SG 2 - P S2 p o w e r s u p p l y
SG 2 - P S2 p o w e r s u p p l y
SG2-PS2
CAUTION
NO USER SERVICEABLE PARTS INSIDE
ASSEMBLED IN MEXICO
SEE INSTALLATION MANUAL FOR SERVICE
VOLTAGE S IN EXCESS OF
300 VOLTS A R E PR ESENT
300 VOLTS A R E PR ESENT
U ND ER COVE R A ND M AY
B E PR ESENT A FT ER POW ER
IS R EMOVED
LO
HI
24V
5V
ADJ
TEST
POINT
TEST
POINT
The optional SG2-PS power supply is required to support DS-SG2-DRT-2X/A transmitters in a
redundant configuration. The SG2-PS2 and SG2-PS power supplies are interchangeable.
redundant configuration. The SG2-PS2 and SG2-PS power supplies are interchangeable.