Motorola SG 2000 operation manual Illustrates the location of the LO-HIjumper

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B e n c h S e t u p

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-HIjumper:

F i g u r e 3 - 5

S G 2 - P S 2 p o w e r s u p p l y

SG2-PS2

NO USER SERVICEABLE PARTS INSIDE

 

 

 

 

 

ASSEMBLED IN MEXICO

CAUTION

 

 

 

 

 

 

24V

 

5V

VOLTAGE S IN EXCESS OF

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

ADJ

 

 

 

IS R EMOVED

 

 

 

 

 

 

 

SEE INSTALLATION MANUAL FOR SERVICE

LO

HI

 

 

TEST

 

TEST

 

 

 

 

 

 

POINT

 

POINT

A second, optional dc power supply located in the lid of the SG 2000, offers full redundancy. Both power supplies are on-line continuously and share the current load. In the event one supply fails, the other assumes the entire load with no disruption of service. Each dc supply can deliver 4.3 A at +24 V and 0.69 A at +5 V. Test points are provided for 24 Vdc and 5 Vdc supplies. Green LEDs— two on each power supply and one on the RF chassis—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. Power supply adjustment R51 is available but should be used only by qualified personnel. When dual supplies are used, the supply with the lower output voltage sets the output voltage of both supplies. Adjusting R51 on the other supply appears to have no visible effect. However, if the “leading” supply fails, the misadjusted supply undergoes a sudden, large voltage change. Figure 3-5 illustrates the location of R51 (ADJ).

The ac input from the feederline to the power supply must be between 44 V and 90 Vrms with a line frequency of 50 Hz or 60 Hz. The wave shape of the input voltage must be quasi-squarewave. The power supply features a self-protection attribute that shuts it down for instantaneous line voltages between 112-142 Vrms. A precision output regulator protects against overcurrent and short circuits, thus providing a precise output voltage.

By selectively positioning a jumper (JP1) on the SG 2000 lid motherboard (LIDB), the power supply can be configured to conform to different power requirements. Figure 3-1 illustrates the location of jumper JP1 and Figure 3-3 illustrates the schematic.

The following subsections explain the powering options.

S G 2 0 0 0 I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l

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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 ManualDocument Conventions If You Need HelpBold type Calling for Repairs Housing SG 2000 housing dimensions front and side viewMounting Holes 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 PathAnalog Return Transmitters Model DescriptionJXP SG2 transmitter block diagramDigital return transmitters Digital Return PathDS-SG2-DRT-2X/A Model Description Function Options and AccessoriesOptions and accessories Level ControlSG2-FE SG2-SBSG2-PS2 SG2Optical 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 Coaxial Cables Fiber CablesCenter conductor length Housing lid and fiber spool tray Fiber spool tray Installation Single Receiver Mode Forward Path RF ConfigurationBroadband/narrowcast Redundant Receiver ModeBroadband/Narrowcast Mode Redundant receiverOverride AB Override FunctionalityStatus monitor/MCB operation Status Monitor/Manual Control OperationAnalog Return Path RF Configuration Redundant returnSplit 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 returnInstalling SG 2000 Optical Modules SG 2000 Optical ModulesRemoving SG 2000 Optical Modules SG2 LR Optical Receiver Cleaning the Optical ConnectorFeature Description 0.3 Test-point voltage versus optical powerWavelength selection jumper Wavelength Selection JumperFeatureDescription SG2-IFPT featuresSG2 Ifpt Optical Transmitter Transmitter enable SG2-FPT featuresSG2 FPT Optical Transmitter 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 connectorSG2-PS Power Supply SG2-PS power supplyDS-SG2-DRT-2X/A second RF input cable connection Parameter Description Status MonitoringDescription Function Manual Control BoardThrough ICS4 Alarm test pointDB test point Potentiometers ICS1Ingress Control State DescriptionOff Appendix a Parameter SpecificationTable A-1 SG 2000 optical characteristics Table A-2 Station RF characteristicsParameterSpeci fic ation Table A-5 SG2-IFPT RF specifications Table A-6 SG2-FPT RF specificationsParameter 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-16 SG2-87 performance, with 110 channels Channels Link Launch SystemTable A-14 SG2-75 performance, with 77 channels Table A-15 SG2-87 performance, with 94 channelsTorque Fastener Screw Size Wrench Size In-lbs Ft-lbs MHz DBcDBm DBmVOptical modulation index Return for service authorizationSnap connector National Television Standards CommitteeMgbi
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