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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 Application Guide: Dual Mode Controller (DMC) 3. The LINE POWER lamp (LP2) extinguishes. 4. Relay RL1 de-energizes. This closes the normally closed contacts RL1, which is one of the conditions required for Stand Alone operation. 5. Relay RL3 energizes This closes the normally open contacts RL3 and energizes the shunt trip of isolation switch (M1). 6. Isolation switch (M1) moves into the tripped position. This isolates the MicroTurbine(s) and the Protected Loads from the utility. Auxiliary contacts M1-A1 close and auxiliary contacts M1-A2 open. This has no effect at this stage. (The motor operator remains de-energized due to the normally-open contacts UVR, and therefore, M1 cannot close.) 7. The LOAD POWER lamp (LP1) extinguishes. 8. Auxiliary contacts M1-A3 close and the MicroTurbine Stand Alone enable is pulled low (enabled). Auxiliary contacts M1-A4 open and the MicroTurbine Grid Connect enable is pulled high (disabled). The MicroTurbine(s) may now operate in Stand Alone, but not Grid Connect. (The MicroTurbine run/stop signal is also pulled low, via diode D1. This enables the MicroTurbine(s) to start.) 9. If the MicroTurbine(s) had been operating in Grid Connect mode, they initiate an orderly shutdown (warmdown). (This shutdown may have been triggered by the protective relay functions of the MicroTurbine(s), before the under voltage relay in the DMC tripped.) The MicroTurbine(s) will complete the warmdown cycle and enter the GC Standby state in 2 to 3 minutes. (If the MicroTurbine(s) had not been operating in Grid Connect mode at the time of the utility outage, they would have been in the GC Standby state from Step 1.) 513000-001 (Oct 2001) Page 17 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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