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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Capstone C65 Electrical Table 6. Connector J8 – Inter-Controller (B) RS-485 Port Pin Signal Parameter J8 (A) J8 (B) J8 (C) J8 (D) J8 (E) J8 (F) J8 (G) J8 (H) J8 (J) J8 (K) J8 (L) J8 (M) Table 6 Notes: Serial Communication (Not Applicable) Inter-Controller Start (Not Applicable) Global E-Stop (Not Applicable) (Not Applicable) Global E-Stop Return (Not Applicable) Inter-Controller Start Return (Not Applicable) Serial Communication RS-485, Bus A Protocol (1) Chassis Ground +24 Volts DC @ 15 milliamps per microturbine (2) Chassis Ground Normal operation: N*42 milliamps. E-Stop: (+) 24 VDC (2) Chassis Ground Spare Normal operation: N*42 milliamps. E-Stop: 0 VDC Reserved 30 milliamps per microturbine @ 0 VDC Reserved RS-485, Bus B Protocol (1) Whenever J8 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 numbers of nodes are exceeded. (2) The Global E-Stop connection sinks 42 milliamps per microturbine in a MultiPac E-Stop circuit. The voltage drop to the most remote microturbine in the interconnecting cables must be kept to 6 volts DC maximum N30 on any global E-Stop. 5.2. Serial Communication Ports (J3 and J5) A PC or PLC device may be connected to the UCB for monitoring, controlling, or trouble- shooting a microturbine system. The microturbine communicates via RS-232 protocols using a null modem cable with hardware handshaking. A DB9 connector (User Port) and a DB25 connector (Maintenance Port) are available. If devices are connected to both ports, the port accessed at a higher password level has priority for command of the system. If both are at the same password level, the Maintenance Port has priority. 5.2.1. DB25 Connector J3 (Maintenance Port) Table 7 and Figure 4 define the connections for connector J3. Table 7. DB25 Connector J3 (Maintenance Port) DB25 (male polarity) and RS-232 protocol. Maximum J3 Maintenance Interface Port null modem cable length is 50 feet (1) Table 7 Notes: (1) Connections made to these ports MUST be isolated from ground and/or communication ports of other microturbines. A 25-pin RS-232 connector is used for Maintenance Port and is identified as J3 on the C65 UCB (see Figure 4). Pin designations are as follows: 410001 Rev N (August 2013) Page 17 of 43 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. Pin Signal ParameterPDF Image | Technical Reference Capstone Model C65 Electrical
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