Harris Platinum HT EL 2000LS Technical Manual

Harris Platinum HT EL 2000LS Technical Manual Manual pdf 19 page image

Section IIInstallation2.1 IntroductionThis section contains information necessary for installationplanning, installation, and initial checkout procedures on Plati-num™ Series HT EL2000LS/HS television transmitters. Theinformation in this section is intended to be used only as ageneral guideline in planning the installation. Since all installa-tions differ in some respects, and in order to conform to localbuilding and electrical codes, the information contained must beadapted for each installation.2.1.1 Test Equipment Requirement PlanningSee Table 2-1 for a list of recommended test equipment.2.2 Mechanical Installation Planning2.2.1 Space Requirements(Refer to Transmitter Outline drawing: 843-5285-110)Planning for the transmitter room should allow space for pro-gram input, monitoring, remote control, and test equipment aswell as the transmitter. Additional area may also be required fortower lighting, HVAC (heating, ventilation and air-condition-ing) equipment, storage, and a workbench. To allow for servic-ing the transmitter, a minimum clearance of 3 feet (92 cm) infront of and 20 inches (51 cm.) behind the cabinet is recom-mended.The Transmitter Outline drawing, shows the air exhaust holepattern locations, do not obstruct these exhaust areas. Leave sideexhaust areas unobstructed for at least 8 inches (20 cm.).2.2.2 Approximate Shipping Weights(lb) (kg)Cabinet 435 198Exciter 55 25RF modules each 26 12Power module 125 57Be sure to include this information in your planning for thebuilding and verify that the structure is capable of safely sup-porting the total weight of the transmitter and peripheral equip-ment.2.2.3 RF System LayoutThe 1 5/8 EIA unflanged visual RF output and the N connectoraural output are on the top of the cabinet. Adapters are furnishedwhere needed to connect RF coax cables to 1 5/8 EIA compo-nents. The outline drawings of typical RF notch diplexers andharmonic filters are included. Use the block diagrams andcomponent outline drawings (Fig 2-2 through 2-11) to plan theinstallation for the site requirements. Locate the transmitterclose to the diplexer to minimize the interconnection line losses.A support system should be installed so that the RF componentsare completely supported, to minimize the weight carried by theoutput connectors. This will prevent possible damage to com-ponents and connectors. Notch diplexers are generally suppliedin a frame which rests on or is bolted to the floor.Directional couplers for metering are in the transmitter cabinet.Optional directional couplers for monitoring are on the blockdiagram and should be ordered with the transmitter. Be sure allcomponents necessary for installation are available on site.2.2.4 Air SystemMinimum transmitter air cooling requirements are 1200 cubicfeet per minute (34 cubic meters per minute). Additional flush-ing air is recommended for the removal of heat from anyequipment surrounding the transmitter. A good guideline is tokeep input air no greater than 5°C above ambient. The maximumtransmitter operating temperature is 45°C at sea level (derate2°C for each 1000 feet (300 meters) above sea level. Hot airrises, one approach would be to use exhaust duct(s) or louversat the highest point of the room and use a supply fan and filterframe to keep the room at a positive pressure.Appendix B contains information useful to those intending touse air conditioning equipment to control transmitter buildingtemperature.2.3 Electrical Installation PlanningEach country establishes standards for AC power systems. Thenational and local applicable standard for the installation shouldbe followed.See Appendix C for information about lightning and surgeprotection.2.3.1 Power RequirementsThe transmitter is designed to operate from 208 to 240 volts, 50or 60 Hz, single phase. If voltage variations in excess of +10%are anticipated, it is recommended that the transmitter AC mainsbe equipped with automatic voltage regulators capable of cor-recting the primary voltage.All control wiring and signal inputs are located at the I/O panelin the cabinet. Additional access is provided in the cabinet floorfor AC wiring only. AC power to the transmitter should be runin metallic conduit, connected to earth ground for safety and toprovide shielding against interference. The power wiring mustbe terminated in a power distribution panel, this panel must alsobe connected to earth ground. A transmitter cabinet ground strapconnection is located at the lower rear edge.2.3.2 Circuit Breaker SelectionThe transmitter requires a relatively stable source of inputpower. For this reason, the primary power for the transmittershould originate at the main power distribution system andremain isolated from other electrical distributions.888-2457-001 2-1WARNING: Disconnect primary power prior to servicing.