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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 Application Guide: Dual Mode Controller (DMC) Stand Alone-to-Grid Connect Transition The following Sequence of Events occurs during the automatic transfer from Stand Alone (SA) mode to Grid Connect (GC) mode. For additional information, please refer to the DMC schematic diagram in the Appendix to this document. 1. The utility voltage is not acceptable. (The under voltage relay in the DMC is tripped.) The DMC POWER switch (S1) is set to ON, and the MODE switch (S2) is set to AUTO. The isolation switch (M1) is open. The MicroTurbine(s) and the Protected Loads are isolated from the utility. The MicroTurbine(s) are operating in Stand Alone mode and are providing power to the Protected Loads. 2. The utility outage ends. Following a time delay set on the under voltage relay in the DMC, the normally open contacts UVR close, and the normally closed contacts UVR open. 3. The LINE POWER lamp (LP2) illuminates. 4. Relay RL1 energizes. This opens normally closed contacts RL1 and the MicroTurbine Stand Alone enable is pulled high (disabled). Also, the run/stop signal is pulled high (stop). 5. The MicroTurbine(s) initiate an orderly shutdown. The MicroTurbine(s) move from the SA Load state to the SA Recharge state. The MicroTurbine(s) output is shutdown and the output contactor(s) open. The Protected Loads are de-energized. 6. The LOAD POWER lamp (LP1) extinguishes. 7. The Solid State Relay in the User Connection Bay (UCB) that is programmed SA LOAD ACTIVE CLOSED and connected to terminals 9 and 10 of the DMC will open. 8. Relay coil RL4 de-energizes. This opens normally open contacts RL4 and relay RL3 is de-energized, thus removing power from the shunt trip of isolation switch (M1). Also, normally closed contacts RL4 close. 513000-001 (Oct 2001) Page 19 of 32 DMC Application Guide. Rev. A Capstone Turbine Corporation reserves the right to change or modify without notice the design, the equipment specifications, and/or the 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 Controller Application Guide
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