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CHAPTER 10 Capstone COMMUNICATIONS Cable Connection Details Capstone offers pre-terminated MultiPac cable sets to simplify field wiring, which include an Ethernet coax cable, RS-485 Inter-cable harness, and end terminators for both the coax and RS-485 cables. Table 10-12 provides reference information about the RS-485 Inter-cable connections to terminals J6 and J8. Table 10-12. Connectors J6 & J8 – Inter-Controller RS-485 Port Pin Signal Parameter J6orJ8(A) J6orJ8(B) J6orJ8(C) J6orJ8(D) J6orJ8(E) J6orJ8(F) J6orJ8(G) J6orJ8(H) J6orJ8(J) J6 or J8 (K) J6 or J8 (L) J6 or J8 (M) Notes: Serial Communication (Not Applicable) Inter-Controller Start (Not Applicable) Global E-Stop (Not Applicable) (Not Applicable) E-Stop Return (Not Applicable) Inter-Controller Start Return (Not Applicable) Serial Communication RS-485, Bus A Protocol (Note 1) Chassis Ground +24 VDC @ 15 milliamps per microturbine (Refer to Table 10-13) Chassis Ground Normal Operation: N*85 milliamps. E-Stop: (+) 24 VDC (Refer to Table 10-13) Chassis Ground Spare Normal Operation: N*85 milliamps. E-Stop: 0 VDC Reserved 30 milliamps per microturbine @ 0 VDC Reserved RS-485, Bus B Protocol (1) Whenever J6 is at the extremities of the RS-485 multi-drop network; Capstone-provided terminators must be installed. The maximum number of nodes is 32, and the maximum RS-485 cable length is 1000 meters. Each microturbine has 1.93 meters of internal cable length, which must be included in the total length considerations. Repeaters may be added whenever the maximum cable lengths or the maximum number of nodes are exceeded. The RS-485 inter-cable harness actually includes three twisted pairs with a common shield. One twisted pair is used for RS-485 communications. The second twisted pair is used for inter-controller start (battery wake-up). The third twisted pair is used to communicate a Global E-Stop. Table 10-13 provides application guidance on limitations of each of the control functions. Please contact Capstone if your application is outside of these limits. Table 10-13. Twisted Wire Pair Limits Wire Pair Limits RS-485 Serial Communications Inter-Controller Start (Battery Wake-Up) Global E-Stop 410066 Rev C (June 2009) Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. 1000m total cable length (refer to Note 1 above) Maximum 20 microturbines Maximum 20 microturbines and 100 meter total cable length 10-19PDF Image | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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