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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 Application Guide: Dual Mode Controller (DMC) 9. Timer Relay TR is energized. This closes normally open contacts TR and starts the delayed contact transition. 10. Delayed contact TR (NCTO) is closed and delayed contact TR (NOTC) is open. The OFF line of the motor operator is energized and the on line of the motor operator is de-energized. The motor operator moves the isolation switch (M1) to the OFF position. 11. Timer delay TR activates the delayed contacts. Delayed contact TR (NCTO) opens and delayed contact TR (NOTC) closes. The OFF line of the motor operator is de-energized and the ON line of the motor operator is energized. The motor operator moves the isolation switch (M1) to the ON position. Auxiliary contacts M1-A1 open, timer relay TR de-energizes, contacts TR and TR (NOTC) open and contact TR (NCTO) closes. Both the ON and OFF lines of the motor operator are now de-energized. Therefore, the isolation switch (M1) remains in the closed position. Auxiliary contacts M1-A2 close, but this has no effect. Auxiliary contacts M1-A3 open, which has no effect at this time. Auxiliary contacts M1-A4 close and the MicroTurbine Grid Connect enable is pulled low (enabled). 12. When isolation switch (M1) closes, the MicroTurbine(s) and the Protected Loads are connected to the utility. At this point, the Protective Loads are re-energized. The total time that the Protected Loads are without power is approximately five seconds. 13. The LOAD POWER lamp (LP1) illuminates. 14. The MicroTurbine(s) complete a battery recharge and cool down cycle. This can take up to 45 minutes, depending on the battery state of charge. The MicroTurbine(s) then enter the SA Stand-by state. 15. The MicroTurbine Stand Alone enable is pulled high (disabled) and the Grid Connect enable is pulled low (enabled), so the MicroTurbine(s) leave the SA Standby state immediately, pass through the Invalid state, and then move to the GC Stand-by state. 16. Depending on the dispatch mode set up from Grid Connect, the MicroTurbine(s) will either remain in the GC Stand-by state or they will start and dispatch power in the GC Load state. The GC restart sequence can take up to two minutes. 513000-001 (Oct 2001) Page 20 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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