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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) DMSC Protective Relay Connections The DMSC contains terminals used to connect to an optional protective relay. Refer to Table 10 for the protective relay connections in the DMSC. Table 10. Protective Relay Control Signal Connections E1 External Trip Open E2 External Trip Open DMSC OPERATION When the utility voltage is acceptable, the DMSC will close the remote disconnect device to connect the microturbine and protected loads to the utility. If the microturbine Start Input is configured as REMOTE, the unit will act as a standby generator and will never start in Grid Connect mode. The microturbine will periodically charge the batteries using power from the utility. If the microturbine Start Input is configured as GC USER/SA REMOTE, the unit will start and dispatch power in Grid Connect mode according to the settings for User Start, User Power Level, Time of Use, and Load Following. The microturbine will periodically charge the batteries using power from the grid or from the engine if the microturbine is operating. When a utility outage occurs, the DMSC will open the remote disconnect device to isolate the microturbine and protected loads from the utility and will automatically dispatch the microturbine to start in the Stand Alone mode, regardless of the Grid Connect dispatch control settings. Grid Connect-to-Stand Alone Transition The following sequence occurs during the automatic transfer from Grid Connect mode to Stand Alone mode. 1. The utility voltage is acceptable. The Undervoltage Relay (UVR) in the DMSC is not tripped. The DMSC POWER switch (S1) is set to ON and the MODE switch (S2) is set to AUTO. The remote motor-operated disconnect device (M1) is closed. The microturbine and protected loads are connected to the utility. The microturbine is either in the Standby state, or operating in the Grid Connect mode. 2. A utility outage begins. The UVR in the DMSC senses the utility outage, and then opens the normally open UVR contacts and closes the normally closed UVR contacts. 3. The LINE POWER lamp (LP2) extinguishes. 4. Relay RL1 de-energizes. This closes the normally closed contacts of RL1, which is one of the conditions required for Stand Alone operation. 410071 Rev D (January 2010) Page 49 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. DMSC Terminal # DescriptionPDF Image | Dual Mode System Controller DMSC
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