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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) Dual Mode Functionality When the microturbine includes the Dual Mode feature, it is capable of providing power either connected to a utility grid (Grid Connect mode) or without presence of a utility voltage (Stand Alone mode). Since the operating characteristics between these two modes are different, the microturbine must be told which mode to be in. The User Connection Bay (UCB) has two hardware interfaces to enable Grid Connect operation (GA Enable) or Stand Alone operation (SA Enable). If the user wants to operate in only one of these modes, a hardware jumper must be connected from pin GA Enable or SA Enable to ground to enable the desired mode, and the desired mode must be selected under “Power Connect” on the microturbine display or CRMS software. Alternatively, the microturbine can be set up for automatic transition between these two modes by wiring control logic between the two mode-enable inputs and ground. The microturbine must then be set for Dual Mode operation in the “Power Connect” menu. Fast Transfer only applies when the microturbine is set to Dual Mode operation, and the mode-enable inputs are properly wired and controlled. Note that “Active” is defined for these mode-enable inputs as being connected to ground (or “Low”). Additionally, the Start/Stop input to the microturbine is used to control the desired mode of operation, as described below, where “Start” means Start/Stop is connected to ground (or “Low”). Grid Connect to Stand Alone Mode When the GC Enable and SA Enable inputs are toggled, and the Start/Stop input is set to “Start”, the microturbine passes through the following transition states, as shown in Figure 22. • Output contactor is opened within about 50 milliseconds to stop export of power from the microturbine, • The microturbine generator continues to produce power, which is available to recharge the battery pack, • The microturbine firmware transfers to the new output mode, • The output contactor closes, making the microturbine power available to the system in the Stand Alone operating mode. 410071 Rev D (January 2010) Page 55 of 71 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 | Dual Mode System Controller DMSC
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