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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Advanced Power Server (APS) 3.1. Overview A MultiPac without an APS consists of multiple subordinate turbines under the control of a single turbine, designated as the master. Any MultiPac allows the user to define or configure a control scheme for all turbines under the control of the master. However, a non-APS MultiPac is limited to only one control scheme per master, which means that every turbine in the MultiPac must follow the same control scheme of the single physical master unit. An APS, on the other hand, can control a variety of virtual “masters” known as groups. Physically, all turbines in the MultiPac connect to the APS, but the turbines within the MultiPac can be assigned to different groups and each group can have a different control scheme. The APS also has the ability to communicate with a Building Management System (BMS) as well as read data from Modbus compatible field devices. The APS can interface with an existing BMS controller over an RS-485 Modbus two-wire network, where the APS is a slave device with a fully software configurable register map. The APS can also act as a master on a RS485 Modbus two-wire network that is completely independent from the incoming RS485 network. On this network, the APS can connect to multiple Modbus slave devices to provide local monitoring and control for Balance of Plant (BOP) equipment, such as reading electric power meters, water flow meters, gas meters, etc. This network is internally connected to the PLC in the APS, which is custom programmed by Capstone for the individual customer’s site needs. In addition, the internal PLC has the ability to interface with discrete I/O, analog voltage I/O, analog current I/O, and analog temperature inputs, giving the APS the ability to handle a variety of needs. 3.2. APS Specifications Figure 1 shows the components of the APS. The APS consists of a steel enclosure that contains a PLC, network switches, Ethernet 10Base-T to 10Base-2 converter, terminal blocks, and power supply with UPS. The following paragraphs describe the physical characteristics and connectivity of the APS. Refer to the APS Product Specification (460064) for APS specifications. 410079 Rev. C (December 2013) Page 9 of 143 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.PDF Image | Technical Reference Advanced Power Server (APS)
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