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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA User’s Manual: Advanced Power Server (APS) Model 145 User's Manual 3.1.4. Modbus Communication The APS 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 a Modbus 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 Modbus network. On this network, the APS can connect to multiple Modbus slave devices to provide local monitoring and control for balance of plant equipment, such as reading electric power meters, water flow meters, gas meters, etc. This network is connected to the PLC in the APS, which is custom programmed by Capstone for the individual customer’s site needs. In addition, this internal PLC has the ability to interface with digital voltage 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 a customer may require. 3.2. Turbine Groups in a MultiPac The turbine groups monitored and controlled by the APS are identified as G1 through G6 and are defined according to operating mode, which is either Stand Alone or Grid Connect. Turbines that operate in Stand Alone mode are assigned to group G1, and turbines that operate in Grid Connect mode are assigned to groups G2 through G6. The group configurations automate the programming of the individual turbines within the group with common settings. This eases setup of each turbine, and controls how a group of turbines operate as a whole. There are five groups available for Grid Connect mode because of the flexibility required for the range of power dispatch modes when connected to a utility grid. Each Grid Connect group (G2 through G6) acts as a separate virtual turbine that can then have completely independent operating modes compared with the other Grid Connect groups. This allows the APS to control groups of turbines in a building that have separate operational goals and/or separate locations. For example, six units might be set up as a backup group for a computer room, five units might be set up as a facility electrical load following group and two units might be on the other side of the building running in Grid Connect heat recovery mode for process heating or air conditioning. The Stand Alone group can be a Stand Alone only configuration or it can support a Dual Mode system, which includes any combination of the turbines from any of the five Grid-Connect groups. When configured for Dual Mode, the turbines in the active Grid Connect groups will run as they were set up. In the event of a power outage, these same turbines will switch over to Stand Alone operation as configured for the Stand Alone group. Therefore, there is not a one-to- one relationship between an individual turbine and a group. The groups are a way to apply settings to turbines that govern how they will function in various applications within their operating mode. 3.3. MultiPac Enable/Disable To perform service and maintenance on a turbine, the individual turbine must be disabled from a MultiPac system. When service or maintenance is completed, the turbine must be added back into the MultiPac system (i.e., enabled). Refer to Control Functions (paragraph 2.3.5) for instructions to use the MultiPac Enable/Disable on the APS touch screen. 400026 Rev E (March 2014) Page 22 of 56 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 | Advanced Power Server (APS) Model 145 User's Manual
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