Chapter 5 Mechanical & Electrical Interfaces
Contents
1. SC J 12 Py Onboard LV Umbilical Part 2 EYI CN 2 1 WXTC ZN BOX EDI5 EB26 ED23 ED24 ED22 Dover Supply1 Power Supply2 Ground Umbilical Part ZN ZN ZN ZN X31 ED43 ED44 42 Box P6 P7 P8 WK KA SI NZ Connecting to Ed LV Control System Bes PA Connecting to Connecting to IH JJ Propulsion System LV Monitoring System SC Console SC RPS Figure 5 6 Onboard LV and Ground U Issue 1999 mbilical System LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY 5 2 21 Onboard LV Umbilical Cable Composition The Onboard LV cable net comprises the cables from the IFDs to WXTC These umbilical cables will fly with LV Whereas Code Description LV SC electrical connectors at LV side which is crimp connected to the cables EC2 Technological interfaces between Dispenser and OMS EYI Interface between umbilical cable and LV TM system through which the LV SC separation signal is sent to LV TM system WXTC Umbilical cable connector LV Ground Gl Grounding points to overlap the shielding of wires and the shell of LV Refer to Figure A5 6 Umbilical Cable Design SC side shall specify characteristics of the IFDs The specific contents are pin assignment usage maximum2. Figure B5 6d SC EPKM Separation Spring Issue 1999 CALT S PROPRIETARY Payload Adapter AMAL Payload Adapter LM 2E USER S MANUAL CHAPTER 5 440 5 SC LV Separation Plane 2 Microswitches Extending Status Bracket SC LV Separation Plane Pushing Rod Separation Spring Extending Status Figure B5 6e SC EPKM Separation Spring Extending Status Issue 1999 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY B5 2 LM 2E EPKM Electrical Interface The SC is electrically connected with SC s electrical ground support equipment EGSE through SC LV In flight disconnectors IFDs and umbilical cables provided by LV side In general SC will control SC EPKM separation the SC adapter will separate from SC together with EPKM The actual electrical interface between LV and SC is defined at the interface between LV and EPKM the top of the interface ring By using of EGSE and the umbilical cables SC team can perform wired testing and pre launch control to the SC such as SC power supply on board battery charging wired monitoring on powering status and other parameters B5 2 1 In Flight Disconnectors IFDs Quantity Typically there are two IFDs symmetrically mounted outside the top ring of the interface adapter The detailed location will be coordinated between SC and LV sides and finally defined in ICD IFD Supply General
3. during disconnection only a low current monitoring signal such as 30V lt 100mA is permitted to pass through the WXTC BOXI BOX 1 is a box adapter for umbilical cable that is located inside the Payload Cable Measurement Room on the umbilical tower Refer to Chapter 7 If needed BOX 1 can provide more interfaces for the connection with SC ground equipment BOX2 BOX 2 is another box adapter for umbilical cable that is located inside the Underground Power supply Room Refer to Chapter 7 Other SC ground support equipment RPS Console etc are also located inside the Underground Power supply Room BOX3 This is a relay box for the disconnection of the umbilical cable BOX 3 is located inside the Underground Power supply Room Box 3 is powered by 2 DC regulated power supply sets These two power supply sets are in working state sparing to each other BOX4 BOX 4 is located inside the Payload Cable Measurement Room It is for the control of the pre launch disconnection of SC umbilical cables Issue 1999 5 13 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Interface on Ground Generally there are four interfaces on ground namely two for SC Console P1 J1 amp P2 J2 and the other two for SC power supply P3 J3 amp P4 J4 SC side will define the detailed requirement of ground interfaces Those connectors P1 P2 P3 P4 to be connected with SC ground equipment should be provided by SC side to LV side
4. CALT S PROPRIETARY Part B Mechanical Electrical Interface Provided by LM 2E EPKM B5 1 LM 2E EPKM Mechanical Interface B5 1 1 Summary As shown in Figure B5 1 the SC adapter is connected with the SC on the top and bolted with EPKM on the bottom EPKM is bolted with the interface adapter which is connected with LV adapter by clampband When the clampband is released the EPKM SC stack together with interface adapter separates from LV adapter The SC adapter connects with EPKM by 100 bolts In general SC will control the EPKM flight as well as EPKM SC separation CALT is willing to satisfy other requirements Spacecraft SC Adapter EPKM Interface Adapter LV Adapter Figure 5 1 LM 2E EPKM Mechanical Interface Overview Issue 1999 5 18 CALT S PROPRIETARY B5 1 2 LV Adapter LM 2E USER S MANUAL CHAPTER 5 LV adapter is an 895mm high truncated cone whose top ring diameter is 1868mm and bottom ring diameter is 3184mm Refer to Figure B5 2 OQ 0 2 1868 0 2 70 4 gt 595 1 Overhead View IV Ir Issue 1999 Figure B5 2 LV Adapter 6 Separation spring brackets 2 Umbilical connector brackets 1 Rate Gyro LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY B5 1 3 Interfac
5. for the manufacture of cables 2 2 2 2 LV side interfaces To be defined by SC side If LV side couldn t get the connectors from SC side this ground interface cable will be provided in cores with pin marks SC side can also provide this ground cable The length of this cable is about 5 meters If so LV side will provide the connectors to connect with BOX 2 Type amp Performance of Umbilical Cable Single Core Shielded Cable Woven wire net for shielding of cable Working voltage lt 60V DC resistance 20 C of each core 38 0Q km Function common control and signal indicating lt Ordinary Insulation Cable No shielding for each core woven tin plated copper wire for shielding of cable Working voltage lt 110V DC resistance 20 C of each core 28 0Q km Function SC s power supply and battery charging lt Twin twist Shielded Cable Each twisted pair is shielded and the whole cable has a woven wire net for shielding Impedance 1000 Function SC data transmission and communication Under normal condition the umbilical cable both onboard LV and ground has a insulation resistance of including between cores core and shielding core and LV shell Issue 1999 5 14 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY The umbilical system can be dedicatedly designed according to the user s requirements A5 2 3 Umbilical Cable Disconnect Control LV side is responsible for the pre launch di
6. other BOX4 BOX 4 is located inside Blockhouse It is for the control of the pre launch disconnection of SC umbilical cables Issue 1999 5 33 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Interface on Ground Generally there are four interfaces on ground namely two for SC Console P1 J1 amp P2 J2 and the other two for SC power supply P3 J3 amp P4 J4 SC side will define the detailed requirement of ground interfaces Those connectors P1 P2 P3 P4 to be connected with SC ground equipment should be provided by SC side to LV side for the manufacture of cables 2 2 2 2 LV side interfaces To be defined by SC side If LV side couldn t get the connectors from SC side this ground interface cable will be provided in cores with pin marks SC side can also provide this ground cable The length of this cable is about 5 meters If so LV side will provide the connectors as Y11P 61 to connect with BOX 2 Type amp Performance The type and performance of the umbilical cables are listed in Figure B5 6 Single Core Shielded Cable KYVRPP 80 0 5 Copper core PV insulation copper film plating on PV for shielding of each core PVC sheath woven wire net for shielding of cable 80 cores cable 0 5mm core Working voltage lt 60V DC resistance 20 C of each core 38 0Q km lt Ordinary Insulation Cable KYVRP 1 108 0 75 copper core with PV insulation PVC sheath woven wire for shielding fle
7. separation can be used as the initial reference for all SC operations After LV SC separation SC side can control SC through microswitches and remote commands Issue 1999 5 15 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY A5 3 RF Links A5 3 1 RF Path JSLC can provide RF link from technical center to the umbilical tower Refer to Figure A5 7 SC T amp C RF Field RF Links PP Diea m BS2 1 ECC WXTC PC HU TO BOX3 EDI3 EDI4 5 ED23 24 ED22 Telemetr ste erface BIOCKHOUS LV Telemetry System Interface SCCONTOLROOM B wa 350m i a MEE 1g nm CLTC is repsonisble for c connection Underground Umbilical Cables Figure A5 7 RF Links in JSLC Issue 1999 5 16 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY 5 3 2 Characteristics of RF Link 1 Frequency C Band Up link 5925 6425 MHz Down link 3700 4200 MHz Ku Band TBD 2 Signal Level C Band See following table Ku Band TBD 37dBm 1 70dBm ______ Frequency Telemetry Command SPECIAL STATEMENT A mission dedicated RF working plan will be worked out Anyway the SC RF equipment should be turned off during the whole flight phase of LV until all SCs are separated form the LV hardware Issue 1999 5 17 LM 2E USER S MANUAL CHAPTER 5
8. 425 MHz Down link 3700 4200 MHz Ku Band TBD 4 Signal Level C Band See following table Ku Band TBD 37dBm 70dBm S dBWm ______ Frequency Telemetry Command SPECIAL STATEMENT A mission dedicated RF working plan will be worked out Anyway the SC RF equipment should be turned off during the whole flight phase of LV until all SCs are separated form the LV hardware Issue 1999 5 38
9. LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY CHAPTER 5 MECHANICAL ELECTRICAL INTERFACE The interface between LV and SC consists of mechanical and electrical interfaces Through mechanical interface the SC is mated with the LV mechanically while the electrical interface functions to electrically connect the LV with SC In this chapter interfaces of LM 2E ETS LM 2E EPKM are focused on Part A Mechanical Electrical Interface Provided by LM 2E ETS A5 1 LM 2E ETS Mechanical Interface A5 1 1 Summary LM 2E ETS provides two types of mechanical interface Type A and Type B Type A mechanical interface is used for connecting SCs laterally while Type B for connecting SCs from their bottom A5 1 2 Type A Mechanical Interface The SCs are connected to the dispenser laterally and the dispenser is bolted on the main structure of OMS that is connected with payload adapter by clampband See Figure A5 1 Note 1 OMS stands for orbital maneuver system 2 ETS consists of OMS and Dispenser Issue 1999 5 1 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Spacecraft Dispenser Spacecraft Orbital Maneuver System OMS Payload Adapter Figure A5 1 Type A Mechanical Interface Type A SC Dispenser The SC dispenser functions to fasten and release the satellites The typical type A SC dispenser is composed of a cylinder and a cone made from frame skin semi monocoque structure The specific design is progr
10. am dependent The dispenser is fixed on the main structure of OMS by bolts The SCs are connected with the dispenser by low shock explosive nuts and separation springs See Figure A5 2a amp b Issue 1999 5 2 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Direction B 3 2 o 5 an 5 x m Separation Direction A uonoerq 14814 Dispenser Dispenser Figure A5 2a Type A SC Dispenser 5 3 Issue 1999 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Separation Device for Type A Dispenser The SC LV separation device consists of explosive nuts and separation springs as shown in Figure A5 2b The explosive nuts are used for locking and unlocking the SCs Catchers can collect the separated bolts The separation springs includes springs bracket pushing rod etc The device can provide a SC LV separation velocity according to user s requirements Detail I Detail Detail Separation Plane Interface Plane Spheric Head i 5 Ri ST gt SN SIL Figure A5 2b Separation Device for Type A SC dispenser Issue 1999 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY A5 1 3 Type B Mechanical Interface The SCs are connected to the dispenser from their bottom and the dispenser is fixed on the main structure of OMS which is connected with payload adapter by clampband See Figure A5 3 There are 4 SC adap
11. are four break wires on the two IFDs for each SC which generate SC LV separation signals The SC will receive the SC LV separation signals once the break wires circuitry break while SC LV separates In the same way there are four break wires on the IFDs The IFDs will send the SC Dispenser separation signal to LV once the break wires circuitry break while SC Dispenser separates This separation signal will be sent to LV s telemetry system through EY1 interface The break wire s allowable current X100mA allowable voltage lt 30V Issue 1999 5 9 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY A5 2 2 Umbilical System The umbilical system consists of onboard LV Parts and ground parts Refer to Figure A5 5 and Figure A5 6 The cable from Launch Control Console LCC to Umbilical Tower EB26 EB36 BOX3 BOX4 and Power supplies 1 amp 2 are the common for different missions The onboard LV cable as well as ground cable from WXTC to ED 13 14 amp 15 and amp BOX2 will be designed for dedicated SC according to user s needs In order to assure the quality of the product the umbilical system will be provided to the user after pre delivery acceptance test and insulation conductivity checkouts in the launch site Dispenser 2 SCI Figure A5 5 LM 2E ETS Onboard LV Electrical Interface Issue 1999 5 10 CALT S PROPRIETARY LM 2E USER S MANUAL CHAPTER 5
12. ation system The SC EPKM separation system consists of clampband system and separation springs The clampband system is used for locking and unlocking SC adapter and the SC The separation springs are mounted on the SC adapter which provides relative velocity between the SC and EPKM Refer to Figure B5 6a b c d amp e Lateral Non contamination Restraining Springs Explosive Bolt Clampband Longitudinal Restraining Springs Separation Spring Y Figure B5 6a SC EPKM Separation System Issue 1999 5 24 CALT S PROPRIETARY LM 2E USER S MANUAL Clampband Dynamic Envelope 7 Clampband 0 7 4 i i Y 3 x Z m 1315 Figure B5 6b Clampband Dynamic Envelope Issue 1999 CHAPTER 5 1495 Explosive Bolt i Y i 5 25 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Detail A SC Interface Ring Payload Adapter Section C C Lateral Explosive Bolt Restraining Spring S S Hi 7 E WS Figure B5 6c Clampband in Detail Issue 1999 5 26 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Section A A SC Interface Ring Clampband 2 Mircoswitches Payload Adapter Section B B 1155 1 TES Y y SC Interface Ring Payload Adapter Longitudinal Restraining Pushing Rod Spring Separation
13. e Adapter LV adapter is a truncated cone whose top ring diameter is 1868mm and bottom ring diameter is 3184mm Refer to Figure B5 3 1760 1868 0 2 l en Overhead View 6 Separation spring brackets 2 Umbilical connector brackets Figure B5 3 Interface Adapter Issue 1999 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY B5 1 4 EPKM SC Interface The top ring of EPKM is connected with SC adapter with 100 bolts as shown in Figure B5 4 276 117 d N 1886 1170 2928 Section Section 100 M6 5H 0 12 B 0 03 A Figure B5 4 EPKM SC Interface Issue 1999 5 21 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY B5 1 5 SC Adapter CALT can provide 1194 adapter as shown in Figure B5 5a amp b 2 Explosive Bolts 2 Microswitches Figure B5 5a SC Adapter 1 Issue 1999 5 22 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Zoom A Y R603 5 r0 ZI uM Section 1 94000 1192 oll 1131 0 5 en 15 0 251579 Figure B5 5b SC Adapter 2 Issue 1999 5 23 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY B5 1 6 SC EPKM Separation System CALT can provide SC EPKM separ
14. e separation system can provide a SC LV separation velocity according to user s requirements lt lt SC LV Separation Plane Explosive Separation Sprihg Figure 5 4c Separation System for Dispenser Issue 1999 5 8 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY A5 2 LM 2E ETS Electrical Interface The SC is electrically connected with SC s electrical ground support equipment EGSE through In flight disconnectors IFDs and umbilical cables provided by LV side By using of EGSE and the umbilical cables SC team can perform wired testing and pre launch control to the SC such as SC power supply on board battery charging wired monitoring on powering status and other parameters A5 2 1 In Flight Disconnectors IFDs Quantity Typically there are two IFDs mounted on the dispenser for each SC The detailed location will be coordinated between SC and LV sides and finally defined in ICD IFD Supply Generally the IFDs are selected and provided by the user CALT is responsible to solder IFDs to the umbilical cables The necessary operation and measurement description shall also be provided If the user selects the China made connectors CALT will provide the halves installed on the SC side The available China made connectors are YF8 64 64 pins FD 20 20 pins FD 26 26 pins FD 50 50 pins etc Separation signal through IFDs There
15. es will fly with LV Whereas Code Description P2 LV SC electrical connectors at LV side which is crimp connected to the cables EC4 Technological interfaces between SC adapter and LV EY1 Interface between umbilical cable and LV TM system through which the EPKM LV separation signal is sent to LV TM system WXTC Umbilical cable connector LV Ground Gl Grounding points to overlap the shielding of wires and the shell of LV Refer to Figure B5 6 Umbilical Cable Design SC side shall specify characteristics of the IFDs The specific contents are pin assignment usage maximum voltage maximum current one way maximum resistance etc CALT will design the umbilical cable according to the specified requirements Types and performance of Umbilical Cable Generally ASTVR and ASTVRP wires are adopted for the onboard LV cable net ASTVR 0 5mm fiber sheath PVC insulation ASTVRP 0 5mm fiber sheath PVC insulation shielded For both cables their working voltage is lt 500 and DC resistance is 38 0Q km 20 C The single core or cluster is shielded and sheathed Issue 1999 5 32 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY B5 2 2 2 Ground Umbilical Cable Net Composition The ground umbilical cable net consists of umbilical cable connector WXTC cables box adapters etc Refer to Figure B5 6 and Figure B5 7 Whereas Code Description WXTC WXTC is umbilica
16. ill be designed for dedicated SC according to User s needs In order to assure the quality of the product the umbilical system will be provided to the User after pre delivery acceptance test and insulation conductivity checkouts in the launch site Ground Disarm Control Box Figure B5 5 LM 2E EPKM Electrical Interface Issue 1999 5 30 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Onboard LV SAID EY2 Umbilical Part 1 EC4 ED13 ED14 15 ves eee 8 535 3 Power Room BOX 1 XI ED23 ED24 ED22 SZ Power i Supplyl Y 36V10A 4 e e i 7 Power i 9 oo Supply2 Y 36V10A z z Ground Umbilical Part gt E gt gt a ZN ANI X31 ED42 BOX2 pg 8 536 3 BOX4 8E70 3B Connecting to LV Control System 1896 72 DS V P4 Connecting to Connecting to gt i MN d LV Monitoring System LV Propulsion System SCConole SCRPS E zc Figure B5 6 Umbilical Cable for SC Issue 1999 5 31 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY B5 2 2 1 Onboard LV Umbilical Cable Composition The Onboard LV cable net comprises the cables from the IFDs P1 P2 to WXTC These umbilical cabl
17. l cable connector LV Ground whose female half socket is installed at the wall of the VEB while the male half pin is attached to the top end of ground cable The disconnection of WXTC is electrically controlled The disconnection is powered by BOX 3 and controlled by BOX 4 In the mean time forced disconnection is also used as a spare separation method Generally WXTC disconnects at about 8min prior to launch If the launch was terminated after the disconnection WXTC could be reconnected within 30min The SC should switch over to internal power supply and cut off ground power supply at 5 minutes prior to WXTC disconnection Therefore during disconnection only a low current monitoring signal such as 30V lt 100mA is permitted to pass through the WXTC BOXI BOX 1 is a box adapter for umbilical cable that is located inside the SC Cable Measurement Room on Floor 8 5 of the umbilical tower If needed BOX 1 can provide more interfaces for the connection with SC ground equipment BOX2 BOX 2 is another box adapter for umbilical cable that is located inside the SC Blockhouse on ground Other SC ground support equipment RPS Console etc are also located inside the Blockhouse BOX3 This is a relay box for the disconnection of the umbilical cable BOX 3 is located inside the under ground Power Supply Room Box 3 is powered by 2 DC regulated power supply sets These two power supply sets are in working state sparing to each
18. ly the IFDs are selected and provided by the user CALT is responsible to solder IFDs to the umbilical cables The necessary operation and measurement description shall also be provided If the user selects the China made connectors CALT will provide the halves installed at the SC side The available China made connectors are YF8 64 64 pins FD 20 20 pins FD 26 26 pins FD 50 50 pins etc Separation Signal through IFDs There are four break wires on the two IFDs for each SC which generate separation signals The SC will receive the EPKM LV separation signals once the break wires circuitry break while EPKM LV separates In the same way there are two break wires on the IFDs J1 amp J2 The IFDs will send the EPKM LV separation signal to LV once the break wires circuitry break while EPKM LV separates This separation signal will be sent to LV s telemetry system through EY1 interface The break wire s allowable current X100mA allowable voltage lt 30V Issue 1999 5 29 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY 5 2 2 Umbilical System The umbilical system consists of onboard LV Parts and ground parts Refer to Figure B5 5 Figure B5 6 and Figure B5 7 The 350m cable from Launch Control Console LCC to Umbilical Tower EB26 EB36 BOX3 BOX4 and Power supply 1 amp 2 are the common to different missions The onboard LV cable as well as ground cable from WXTC to ED 13 14 amp 15 and BOX1 amp BOX2 w
19. mal could the order of umbilical cable disconnection be sent out B5 2 4 Anti lightning Shielding and Grounding In order to assure the safety of the operations of both LV and SC some measures have been taken for anti lightning shielding and grounding lt cable has two shielding layers the outer shielding is for anti lightning while the inner shielding is for anti interference For the cables from WXTC to BOX 2 the outer shielding anti lightning has a grounding point every 20m These grounding measures can assure the lightning and other inductance to be discharged immediately The grounding locations are either on the swing rods or the cable s supporting brackets 5 gt inner shield has a single grounding The inner shields of the on board cables are connected to BOX 2 through WXTC BOX 2 has a grounding pole Issue 1999 5 35 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY lt gt inner and outer shields are insulated with each other inside the cables B5 2 5 Continuity of SC Earth Potential The SC should have a reference point of earth potential and this benchmark should be near to the separation plane Generally the resistance between all other metal parts of SC shell structures etc and this benchmark should be less than 10mQ under a current of 10mA There is also a reference point of earth potential at the bottom of the adapter The resistance between reference poin
20. sconnection of umbilical cable through BOX3 and BOX 4 Inside the underground Power Supply Room there are two DC regulated power supply which will provide power for the cables They are all in working condition sparing to each other Generally according to the count down launch procedure only after LV side has received the confirmation that SC has turned to internal power and SC is normal could the order of umbilical cable disconnection be sent out A5 2 4 Anti lightning Shielding and Grounding In order to assure the safety of the operations of both LV and SC some measures have been taken for anti lightning shielding and grounding 1 The cable has two shielding layers the outer shielding is for anti lightning while the inner shielding is for anti interference 2 For the cables from WXTC to BOX 2 the outer shielding anti lightning has grounding point every 20m These grounding measures can assure the lightning and other inductance to be discharged immediately The grounding locations are either on the swing rods or the cable s supporting brackets 3 The inner shield has a single grounding The inner shields of the on board cables are connected to BOX 2 through WXTC BOX 2 has a grounding pole 4 The inner and outer shields are insulated with each other inside the cables SPECIAL STATEMENT Any signal possibly dangerous to the flight can not be sent to the SCs during the whole flight till LV SC separation Only LV SC
21. t at the adapter and SC reference should be less than 10mQ with a current of 10mA In order to keep the continuity of earth potential and meet this requirement the bottom of SC to be mated with adapter should not be treated chemically or treated through any other methodology affecting its electrical conductivity SPECIAL STATEMENT Any signal possibly dangerous to the flight can not be sent to the SC during the whole flight till EPKM LV separation Only EPKM LV separation can be used as the initial reference for all SC operations After EPKM LV separation SC side can control SC through microswitches and remote commands Issue 1999 5 36 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY 5 3 RF Links B5 3 1 RF Relay Path XSLC can provide RF link from EGSE to SC either in BS or on the umbilical tower Refer to Figure B5 7 L z n E KN L3 On the On the UmbilicalTower SC T amp C RF Field EGSE EDI3 ED14 5 ED23 ED24 ED22 LV Telemetry System Interface BLOCKHOUSE r H SC CONTROL ROOM H H i H 1 i H H 1 i ee AEE CLTC is epsonisble for connection 1 L 350m Underground Umbilical Cables Figure B5 7 RF Links Issue 1999 5 37 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY 5 3 2 Characteristics of RF Link 3 Frequency C Band Up link 5925 6
22. ters fixed on the main structure of the typical type B dispenser The SCs are mounted on the SC adapters by low shock explosive nuts and separation springs Spacecraft Spacecraft Dispenser Orbit Maneuver System Payload Adapter Figure A5 3 Configuration of Type B Mechanical Interface Type B Dispenser The type B dispenser is a short reverse cone structure with four SC adapters as shown in Figure A5 4a The SC adapter is fastened to the SC adapter at its bottom using explosive nuts All the separation system except for bolt catcher is attached on the SC adapter Issue 1999 5 5 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY SC Adapter i Figure A5 4a Dispenser 1 Issue 1999 5 6 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Detail I Section A A SC Adapter LA Separation Spring Bracket ZZZ 222 L Figure A5 4bType Dispenser 2 Issue 1999 5 7 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY Separation System The separation system consists of explosive nuts and separation springs See Figure A5 4c The explosive nuts are used for locking and unlocking the SCs The separation springs includes springs bracket pushing rod etc The catcher can collect the separated bolts Th
23. voltage maximum current one way maximum resistance etc CALT will design the umbilical cable according to the specified requirements Types and Performance of Umbilical Cable Generally ASTVR and ASTVRP wires are adopted for the onboard LV cable net ASTVR 0 5mm fiber sheath PVC insulation ASTVRP 0 5mm fiber sheath PVC insulation shielded For both cables their working voltage is lt 500 and DC resistance is 38 0Q km 20 C The single core or cluster is shielded and sheathed Issue 1999 5 12 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY A5 2 2 2 Ground Umbilical System Composition The ground umbilical cable net consists of umbilical cable connector WXTC cables box adapters etc Refer to Figure A5 6 Whereas Code Description WXTC WXTC is umbilical cable connector LV Ground whose female half socket is installed at the wall of the VEB while the male half pin is attached to the top end of ground cable The disconnection of WXTC is electrically controlled The disconnection is powered by BOX 3 and controlled by BOX 4 In the mean time forced disconnection is also used as a spare separation method Generally WXTC disconnects at about 8min prior to launch If the launch was terminated after the disconnection WXTC could be reconnected within 30min The SC should switch over to internal power supply and cut off ground power supply at 5 minutes prior to WXTC disconnection Therefore
24. xible 108 cores cable 0 75mm core No shielding for each core woven tin plated copper wire for shielding of cable Working voltage lt 110V DC resistance 20 C of each core 28 0Q km lt Twin twist Shielded Cable Issue 1999 5 34 LM 2E USER S MANUAL CHAPTER 5 CALT S PROPRIETARY KSEYVP 6x2x0 75 6 pairs of twin twisted cores 0 75mm core Each twisted pair is shielded and the whole cable has a woven wire net for shielding Impedance 1000 Twin twist shielded cable KSEYVP are generally used for SC data transmission and communication Single core shielded cable KYVRPP is often used for common control and signal indicating KYVRP 1 cable is adopted for SC s power supply ground and multi cores are paralleled to meet the SC s single loop resistance requirement Under normal condition the umbilical cable both on board and ground has a insulation resistance of including between cores core and shielding core and LV shell B5 2 3 Umbilical Cable Disconnect Control LV side is responsible for the pre launch disconnection of umbilical cable through BOX3 and BOX 4 Inside the underground Power Supply Room there are two 36V 10A DC regulated power supply which will provide power for the cables They are all in working condition sparing to each other Generally according to the count down launch procedure only after LV side has received the confirmation that SC has turned to internal power and SC is nor
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