Motorola SG 2000 operation manual Power Supply, SG2-PS2 power supply

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O v e r v i e w

Power Supply

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).

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.

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.

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.

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.

Figure 2-4 illustrates the SG2-PS2 power supply:

Figure 2-4

SG2-PS2 power supply

SG2-PS2

NO USER SERVICEABLE PARTS INSIDE

 

 

 

 

 

ASSEMBLED IN MEXICO

CAUTION

 

 

 

 

 

 

24V

 

5V

 

 

 

 

 

 

 

VOLTAGE S IN EXCESS OF

 

 

 

 

 

 

 

 

 

 

300 VOLTS ARE PRESENT

 

 

 

 

 

 

 

 

 

 

UNDER COVE R AND MAY

 

 

 

 

 

 

 

 

 

 

BE PRESENT AFTER POWER

 

 

 

 

ADJ

 

 

 

IS REMOVED

 

 

 

 

 

TEST

SEE INSTALLATION MANUAL FOR SERVICE

LO

HI

 

 

TEST

 

 

POINT

 

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.

SG 2000 Installation and O peration Manual

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Contents A R L I N E Special Symbols that Might Appear on the Equipment Contents E r a t i o n InstallationTorque Specifications Abbreviations and Acronyms Specification sSG2-LR Tables N t e n t s SG 2000 closed SectionSG 2000 open Features includeRelated Documentation Using this ManualBold type Document ConventionsIf You Need Help Calling for Repairs Mounting Holes HousingSG 2000 housing dimensions front and side view Port locations Port LocationsGaskets Housing gasketsSG2-PS2 power supply Power SupplyNetwork Monitoring ConfigurationTo suit system requirements the RF chassis cover. notation Forward Path Signal flow diagramE r v i e w SG2-LR Receiver SG2-LR receiver functional diagramAnalog Return Transmitters Analog Return PathModel Description Analog return transmittersJXP SG2 transmitter block diagramDigital return transmitters Digital Return PathDS-SG2-DRT-2X/A Options and accessories Options and AccessoriesLevel Control Model Description FunctionSG2-PS2 SG2-SBSG2 SG2-FEOptical input versus 750 MHz gain Gain SelectionOptical input versus 870 MHz gain 10 illustrates the gain option selection chart for 870 MHzRelative level dB versus 750 MHz slope 77 channels Tilt SelectionRelative level dB versus 870 MHz slope 94 channels SG2 870 MHz Slope Chart Analog Channels, 220 MHz DigitalRelative level dB versus 870 MHz slope 110 channels SG2 870 MHz Slope Chart Analog Channels, 120 MHz DigitalN c h S e t u p G u r e 3 2 0 0 0 R F c h a s s i s W e r i n g t h e N o d e Fuse Functi o n Rati ng Ype W e r S u p p l y S e t t i n g s Illustrates the location of the LO-HIjumper Single Power Supply or Commonly Po wered Redundant Supplies I c k C h e c k s F u n c t i o n a l T e s t i n g N u a l G a i n C o n t r o l Analog Retu rn Path R w a r d P a t h P a d d i n g B l e 3 2 0 0 0 p a d c h a r t s t a n d a r d g a i n B l e 3 2 0 0 0 p a d c h a r t h i g h g a i n G u r e 3 N k P e r f o r m a n c e G u r e 3 1 N c h S e t u p Install i n g t h e D S S G 2 D R R B B o a r d O p t i o n G u r e 3 1 S G 2 D R R B b o a r d Install e d G u r e 3 1 C a t i o n o f J X P s o n E p a c k Digital Transmitter Install i n g t h e S t a t u s M o n i t o r O p t i o n 2 0 0 0 a c t i v a t i o n W o r k s h e e t DC powering Splicing Fiber Service cable connection and compression fittingInstallation Mounting bracket-front view Strand Wire MountingMounting bracket-rear and side views Center conductor length Coaxial CablesFiber Cables Housing lid and fiber spool tray Fiber spool tray Installation Single Receiver Mode Forward Path RF ConfigurationBroadband/Narrowcast Mode Redundant Receiver ModeRedundant receiver Broadband/narrowcastOverride AB Override FunctionalityStatus monitor/MCB operation Status Monitor/Manual Control OperationSplit return Analog Return Path RF ConfigurationRedundant return RF chassis and location of the SG2-RPM/C or SG2-RPM/S board DS-SG2-DRT/A redundant return Digital Return Path RF ConfigurationDS-SG2-DRT-2X/A redundant return DS-SG2-DRT-2X/A split returnRemoving SG 2000 Optical Modules Installing SG 2000 Optical ModulesSG 2000 Optical Modules SG2 LR Optical Receiver Cleaning the Optical ConnectorFeature Description 0.3 Test-point voltage versus optical powerWavelength selection jumper Wavelength Selection JumperSG2 Ifpt Optical Transmitter FeatureDescriptionSG2-IFPT features SG2 FPT Optical Transmitter Transmitter enableSG2-FPT features SG2 Dfbt Optical Transmitter SG2-DFBT featuresSingle red LED that lights if the hybrid current is outside SG2 DFBT/3 Optical Transmitter SG2-DFBT/3 featuresSG2 Eifpt Optical Transmitter SG2-EIFPT featuresDS-SG2-DRT/A DS SG2 DRT/A Digital Return TransmitterDS-SG2-DRT/A features FeatureDS-SG2-DRT-2X/A DS SG2 DRT 2X/A Digital Return TransmitterDS-SG2-DRT-2X/A features DS-SG2-DRT-2X/A installed in SG DS-SG2-DRT-2X/A cable connectorDS-SG2-DRT-2X/A second RF input cable connection SG2-PS Power SupplySG2-PS power supply Parameter Description Status MonitoringDescription Function Manual Control BoardDB test point Alarm test pointPotentiometers ICS1 Through ICS4Off Ingress ControlState Description Table A-1 SG 2000 optical characteristics Parameter SpecificationTable A-2 Station RF characteristics Appendix aParameterSpeci fic ation Parameter Table A-5 SG2-IFPT RF specificationsTable A-6 SG2-FPT RF specifications Table A-8 SG2-DFBT/3 RF specifications Table A-7 SG2-DFBT RF specificationsTable A-10 SG2-DRT/A RF specifications Table A-9 SG2-EIFPT RF specificationsTable A-11 SG2-DRT-2X/A RF specifications Minimum Optical Model Output Power DBmOption Watts ac Amps Power @90V @60V @52V @44V Table A-14 SG2-75 performance, with 77 channels Channels Link Launch SystemTable A-15 SG2-87 performance, with 94 channels Table A-16 SG2-87 performance, with 110 channelsTorque Fastener Screw Size Wrench Size In-lbs Ft-lbs DBm DBcDBmV MHzSnap connector Return for service authorizationNational Television Standards Committee Optical modulation indexMgbi
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