HarrisMw50c3电路图.pdf

TECHNICAL MANUAL MW-50C3 MEDIUM WAVE AM BROADCAST TRANSMITTER 994 8832 004 T.M. No. 888-2213-011 Copyright HARRIS CORPORATION 1986 All Rights Reserved Printed: October 2, 1986 RadioFans.CN 收音机爱 好者资料库 MANUAL REVISION HISTORY MW-50C3 MEDIUM WAVE AX BROADCAST TRANSMITTER 888-2213-xxx REV i/ DATE ECN PAGES AFFECTED 002 lo-lo-85 29595 Replaced the following pages: Ti;le Page, g-319-4 Added the following page: Manual Revision History Page 003 2-5-86 29673 004 2-6-86 29816 005 2-7-86 29830 006 3-15-86 29922 007 -95%, +125% modulation. Positive Peak Capability +125% with program modulation at 55kW. 888-2213-001 l-7 WARNING: Disconnect primary power prior to SeNiCkIg. Table l-l. Electrical Characteristics (Continued) FUNCTION CHARACTERISTIC Noise (Unweighted) AM stereo operation Audio Input Power Input Power Consumption Overall Efficiency Power Factor Tubes Used Monitor Provision Remote Control Self-contained interface for extend- ed or remote control. 1. If transmitter is operated int distortion at the higher modula a bandwidth limited antenna system, on frequencies may degrade. 2. Noise measured over the band 2( ages of the supply line balance unbalance. Hz to 20 kHz, with line-to-line volt- Noise may degrade with line voltage 3. Typical power consumption figul ; are for 50 kilowatts output and for optimum transmitter adjustment. For high output power and/or transmit- ter misadjustments, power consu tion may be higher. -60 dB or better below 100% modula- tion. Typical -62 dB.2 Incidental Quadrature Modulation (IQM) is down 25 dB of batter at 95% modulation. 600 ohms at 0 to +lO dBm for 100% modulation, unenhanced; f16 dBm with enhancement activated. 480V t5%, 3 phase, 60 Hz 80kW at 0% modulation 87kW at 30% modulation 1lOkW at 100% modulation3 Better than 6q% at average modulation 95% (2) 4cx35oooc (1) 4CX1500A An unmodulated sample is provided for freq monitor and a modulated sample for modulation monitoring. 1-8 888-2213-001 WARNING: Disconnect primary power prior to servicing. Table 1-2. Mechanical/Environmental Characteristics FUNCTION CHARACTERISTIC Dimensions, Transmitter Width 144 in. (3.7 meters) Depth 48 in. (1.3 meters) Height 78 in. (2.0 meters) High Voltage Power Supply Width 58 in. (1.47 meters) Depth 37.5 in. (0.95 meters) Height 60 in. (1.52 meters) Wall Mounted Circuit Breaker: Width 30 in. (0.77 meters) Depth 10 in. (0.26 meters) Height 46.3 in. (1.18 meters) Floor Space Main Transmitter Assembly 48 Sq. Ft. (4.5 square meters) High-Voltage Power Supply Weights (approximate) 15 Sq. Ft. (1.4 square meters) Main Transmitter Assembly Net unpacked 5000 pounds (2268 kg) Domestic packed 6000 pounds (2722 kg Export packed 7200 pounds (3266 kg) 50kW High-Voltage Power Supply (Wet) Net unpacked 650 pounds (294.84 kg) Domestic packed 1780 pounds (807.3 kg) Export packed 2080 pounds (943.47 kg Wall Mounted Circuit Breaker Net unpacked 75 pounds (34 kg) Domestic packed 125 pounds (57 kg) Export packed 150 pounds (68 kg) Cubage Complete Transmitter Operating Temperature Range 700 cu. ft. (19.82 cu. meters) -20% to +50% at sea 1GJe (derate 2O per 306 meters altitude) Humidity Altitude 95% maximum 10,000 Ft (3048 meters) above sea level maximum 888-2213-001 l-9/1-10 WARNING: Disconnect primary power prior to servicing. SECTION II INSTALLATION 2-1. INTRODUCTION 2-2. This section contains information for installing the HARRIS Mw-5OC3 MEDIUM WAVE AM BROADCAST TRANSMITTER and performing preoperational checks. Many conponents are removed from the transmitter after final test for ship- merit. These components will he identified with appropriate instructions for reinstallation and wiring. 2-3. UNPACKING 2-4. Carefully unpack the MW-5OC3 Transmitter and perform a visual inspec- tion to determine that no apparent damage was incurred during shipment. Re- tain the shipping materials until it has been determined that the unit is not damaged. The contents of the shipment should he as indicated on the packing list. If the contents are incomplete or if the unit is damaged electrically or mechanically, notify the carrier and HARRIS CORPORATION, Broadcast Trans- mission Division. 2-5. RETURNS AND EXCHANGES 2-6. Damaged or undamaged equipment should not be returned unless written approval and a Return Authorization is received from HARRIS CORPORATION, Broadcast Division. Special shipping instructions and coding will be provided to assure proper handling. Complete details regarding circumstances and reasons for return are to be included in the request for return. Custom equipment or special order equipment is not returnable. In those instances where return or exchange of equipment is at the request of the customer, or convenience of the customer, a restocking fee will be charged. All returns will be sent freight prepaid and properly insured by the customer. when communicating with HARRIS CORPORATION, Broadcast Division, specify the HARRIS Order Number or Invoice Number. 2-7. INSTALLATION 2-8. Prior to installation, this Technical Manual should he carefully studied to get a thorough understanding of the principles of operation, circuitry, and nomenclature. This will facilitate proper installation and initial checkout. The MW-50C3 Transmitter installation is accomplished in four steps, transmitter placement, component installation, transmitter wiring, and initial turn on and checkout. 2-v. COOLING AIR REQUIREMENTS Z-10. Ail ducting should offer no restrictions to a minimum air flow of 5000 CFM. If possible, the transmitter room should be under positive pres- sure with the air supply as clean as possible. Air filters are located in the outside rear doors and consists of a 1 x 26 x 33 inch (2.54 x 66.04 x 83.82 cm) washable, expanded foam element. Replacement filters are available 888-2213-009 2-1 WARNING: Disconnect primary power prior to servicing. from HARRIS CORPORATION, Broadcast Transmission Division as required. Exhaust air may be ducted out of the transmitter room but the duct system must not introduce any back pressure on the transmitter exhaust. The exhaust fan in the duct system must overcome duct losses and overcome any wind pressures if vented to the outside. Two cooling air configurations are available. Refer to figure 2-1. a. Rear air intake using internal blower and fan exhausting at trans- mitter top into free air. b. Base entry of filtered air using internal blower and fan. 1. The Modulator and PA Cabinet requires 2200 CFM through any combination of A openings. The air system must overcome all duct and entrance loses with positive pressure in the blower compartment. 2. The Output Cabinet requires 3000 CFM through any combination of B openings. The air system must overcome all duct and entrance loses with positive pressure in the fan compartment. Z-11. TRANSMITTEK PLACEMENT 2-12. The two cubicles of this transmitter, as shown in figure 2-1, should be placed in position, aligned level, and bolted together with 3/8-16 X l- inch bolts, flat washers, lock washers, and nuts. Install the four aluminum channels around the edges of the large opening between cubicles with lo-32 X l/2-inch screws and lockwashers. The bottom channel mounts three cast mica capacitors (lC2, lC2A and lC2B). Figure 2-2 and 2-3 show component instal- lation between cabinets. 2-13. The High-Voltage Power Supply, Transmitter, and the Step-Start Assem- bly should be located close to each other near the main ac power entrance to eliminatie running heavy power cables any great distance. 2-14. COMPONENT INSTALLATION 2-15. Tubes, capacitors, connectors, cables, etc. are shipped in separate cartons. The removal of components varies due to method and requirements of shipment. All removed items are tagged to permit reinstallation in the transmitter. Arrange these components in separate groups according to the section from which they were removed. Parts in the interior should be installed first. Both front and rear transmitter doors are removed for shipment and should be left off until the installation of removed components and cabinet wiring hook up is complete. 2-16. Items such as interconnecting wires and cables, shock mounted devices, and miscellaneous small parts may be taped or tied in for shipment. Remove all tape, string, and packing material that has been used for this purpose. BE SURE TO REMOVE ALL THE TAPE THAT MAY HAVE BEEN INSTALLED AS ANTI-CHAFFING STRIPS BETWEEN ALUMINUM PANELS. 2-2 888-2213-001 WARNING: Disconnect primary power prior to servicing. 36.6 COOOR SWING) I ll OUTPUT FRO I I OPTIONAL - In-29 UNF THO VOLE AUOIO ENTRANCE EO FOR OPTIONAL tx”“sT AIR OUCT FOR I IN. CONOUII / 22;” t REAR ELEVATION , MECHANICAL DATA FOR MW-50C AUDIBLE NOISE MEASUREMENT: I METER FROM FLOOR AND I METER FROM EACH ENCLOSURE. MODULATOR FRONT .- 70 dBA f”;$;R REAR - BB dBA PA REAR - EB ddge OUTPUT I FRONT 1 67 dBA OUTPUT 1 REAR - 77 dBA OUTPUT 2 FRONT - 67 dBA OUTPUT 2 REAR - 75 dBA AIR FLOW THROUGH THE TRANSMITTER: FLUSHING AIR (COOLS OUTPUT NETWORK,AND AREA ABOVE P.A. AND MOD. TUBES) 3000 CFM. HIGH PRESSURE AIR (COOLS PA, MODULATOR AND DRIVER TUBES). 2200 CFM TOTAL. AIR THROUGH P.A. TUBE = 860 CFM. AIR THROUGH MOD TUBE = 860 CFU. AIR THROUGH DRIVER TUBES E 480 CFU TOTAL. AIR TEMP RISE THROUGH PA TUBE = 36.C. AIR TWP RISE THROUGH MOD TUBE o 38.C. ENTRANCE SECTION A-A OPTIONAL BASE 41R INLETS ANO WIRE ENTRANCES FIGURE 2-l. MW-5OC3 OUTLINE DRAWING (SHEET 1 OF 4) 839 6587 128-A 888-2213-0011 2-312-4 PLAN pg ELEVATION Isi Jfe 3.0 9 6 OUTPUT WIRE CLEARANCE WALL MOUNTEO STEP START COOLING AIR REQUIREMENTS OPTION I - REAR AIR INTAKE USING INTERNAL PRESSURE BLOWER AND FLUSHING FAN EXHAUSTING AT TRANSMITTER TOP INTO FREE AIR. 46OV 60HZ STANMRO HV POWER SUPPLY OPTION 2 RESSURE NOTE: EXHAUST AIR 5200 CFM MAY BE DUCTED OUT OF TRANSMITTER ROOM IN ANY OF THE ABOVE OPTIONS. THE DUCT SYSTEM MUST NOT INTRODUCE ANY BACK-PRESSURE ON THE TRANSMITTER EXHAUST. (THE EXHAUST FAN IN THE DUCT SYSTEM MUST OVERCOME DUCT LOSSES AND OVERCOME ANY WIND PRESSURES IF VENTED TO OUTSIDE). FIGURE 2-1. MW-50C3 OUTLINE DRAWING (SHEET 2 OF 4) 839 6587 128-A 888-2213-0011 2-512-6 78.0 34.5 TYP L- 4.5 TYP -I- 245BRE8H EXHAUST FAN WITH ROOF CURB AND BACKDRAFT DAMPER AS SUPPLIED BY POWER LINE FANS BOX 1313 NEW BRlTAN.CONN.06050 19.0 REF 19.0 REF EXHAUST HOOD EXHAUST HOOD h h 12.0 12.0 6.0 6.0 I AIR INLET r 2200 1 CFM 24.25 TYP L 72.0 PER CABINET - REAR ELEVATION 144.0 FIGURE 2-1. MW-5003 OUTLINE DRAWING (SHEET 3 OF 4) 839 6587 128 888-2213-0011 2-712-a FIGURE 2-1. MW-5OC3 OUTLINE DRAbING (SHEET 4 OF 4) 839 6587 128 888-2213-0011 2-912-10 2Ci.6 SENSOR Figure 2-2. Cabinet 2 Upper Right Rear 888-2213-001 2-11 WARNING: Disconnect primary power prior to servicing. 2A3 / 2-12 Figure 2-3. Cabinet 2 Lower Right Rear 888-2213-001 WARNING: Disconnect primary power prior to servicing. PLATE CURRENT SENSOR 42T2 -2Tl -2TB2 2-17. Symbol numbers and descriptions are provided on each removed component corresponding to the schematic diagram, parts list, and packing list. Symbol numbers are also stenciled near the cabinet location of each removed item. Terminals and wires carry tags with information telling how to reconnect each item. Mounting hardware will be found either in small bags attached to each removed component or inserted in the taped holes where each component mounts. 2-18. The method of shipment determines which components are removed. The following components are removed from the MW-5OC3 Transmitter when shipped by truck or rail freight. a. Removed Erom Cabinet 1 Modulator Section. Item Ref. Designator Shown in Fig. No. Transformer 1Tl 2-4 Transformer lT4 2-4 Inductor lL6 2-4 capacitor lC12 2-5 b. Removed from Cabinet 1 PA Section. Item Ref. Designator Shown in Fig. No. Transformer lA9T3 2-7, 2-8, 2-9 Transformer lA9T4 2-7, 2-9 Inductor lA9L6 2-9 Induc tar lL3 2-8 Capacitor 1Cl 2-9 capacitor lC2 2-2 Capacitor lC2A 2-2 Capacitor lC2B 2-2 C. Removed from Cabinet 2 Output. I tern Ref. Designator Shown in Fig. No. capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Resistor Transformer 2Cl 2C2A 2C6 2c12 2C13 2C14 27, 28 2R9, 2RlO 2T1, 2T2 2-2 2-2 Z-10 2-11 2-11 2-11 Z-10, 2-11 2-3, 2-12 d. For reference during assembly, the Oscillator is shown in figures 2-13 and Z-14, the control panel is shown in figure 2-15, and the High-Voltage Step-Start Assembly is shown in figure 2-16. 888-2213-001 2-13 WARNING: Disconnect primary power prior to servicing e. Three 12 cc bottles of dashpot fluid are supplied with the trans- mitter which must be added as required to the oil bowls of the High-Voltage Step-Start Assembly magnetic overloads (3K3, 3K4, 3K5 figure Z-16). Adjustments are provided on the overload relays for both overload current and time delay. The overload value is set by rotating the armature on its threaded core. A tab aligns with markers on the armature to indicate the overload current. The amount of delay is determined by the quantity of oil in the dashpot. Only enough oil should be used as is required to stop the contactor from pumping when voltage is applied. If no pumping has occurred, no oil should be added. f. If relay adjustment is required, unsnap the oil bowl from the bot- tom of each relay and remove the armature and piston. The over- load tripping current should first be set by instructions printed on the face of each relay so that the ac overloads just hold in when the transmitter is 100 percent modulated at a low frequency. Only enough oil should be added as is required to touch the rings on the bottom of the piston when the piston is placed in the dash- pot. Replace the cores and snap the bowls back on the magnetic trip units. DO NOT CONNECT STATION PRIMARY POWER TO THE TRANSMITTER AT THIS TINE. USE A GROUNDING STICK TO DISSIPATE POTENTIAL FROM ALL TAPS, COMPONENTS, AND CONNEC- TIONS BEFORE TOUCHING THEM. 2-19. LIGHT SENSOR ASSEMBLY INSTALLATION Z-20. The Light Sensor Assembly is mounted on the top channel of the window between the PA/Modulator Cabinet and the Output Network Cabinet as shown in figure 2-2. Terminal board lTB8 is mounted on the upperside of the top chan- nel causing it to be hidden from view when the channel is in place. Terminal board lTB8 is a junction for connecting the Indicator/Overload Assembly wiring to the Light Sensor wiring. Complete the following steps for instal- lation: a. Connect wires to terminal board lTB8. Refer to schematic 839 6587 037. b. Install top channel in place. C. Install Light Sensor in position shown. 2-14 888-2213-001 WARNING: Disconnect primary power prior to servicing lL4 / Figure 2-4. Cabinet 1 Lower Left Front and Door 888-2213-001 2-15 WARNING: Disconnect primary power prior to servicing 1Bl lC12, lAlR3 ,lA8TBl /JR34 2-16 Figure 2-5. Cabinet 1 Left Front 888-2213-001 WARNING: Disconnect primary powe