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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) 5. Relay RL9 energizes, which energizes relay RL3 and sets the latch of LRL1. The normally open contacts of RL3 close and energize the shunt trip of the remote disconnect device (M1). 6. The remote disconnect device (M1) moves into the tripped position. This isolates the microturbine and protected loads from the utility. Auxiliary contacts M1-A1 close and auxiliary contacts M1-A2 open. The motor operator remains de-energized due to the normally open UVR contacts – therefore the remote isolation device cannot close. 7. The LOAD POWER lamp (LP1) extinguishes. 8. The contacts of RL7 close and the microturbine Stand Alone Enable line is pulled low (enabled). The contacts of RL8 open and the microturbine Grid Connect enable is pulled high (disabled). The microturbine may now operate in Stand Alone mode, but not Grid Connect mode. The microturbine run/stop signal is also pulled low, via diode D1 – this enables the microturbine to start. 9. The SWITCH CLOSED lamp (LP4) extinguishes, and the SWITCH OPEN lamp (LP5) illuminates. 10. If the microturbine had been operating in Grid Connect mode, an orderly shutdown (warm-down) is initiated. This shutdown may have been triggered by the protective relay functions of the microturbine, before the UVR in the DMSC tripped. The microturbine enters the warm-down cycle. If the microturbine had not been operating in Grid Connect mode at the time of the utility outage, it would have been in the Grid Connect Standby state from Step 1. 11. The Grid Connect Enable is pulled high (disabled) and the Stand Alone Enable is pulled low (enabled), so the microturbine leaves the Grid Connect Standby state immediately, passes through the Invalid state, and enters the Stand Alone Standby state. 12. The Run/Stop signal is pulled low, so the microturbine initiates a start in Stand Alone mode. If the microturbine had been operating previously in the Grid Connect mode, it takes less than 10 seconds to complete the Stand Alone Start sequence, before being ready to reach to Stand Alone Load state. If the microturbine had been in the Grid Connect Standby state, this can take two minutes or more. 13. Once the Stand Alone Start sequence is completed, the microturbine will transition to the Stand Alone Load state, provided that Auto Load is enabled. The microturbine will then provide power to the protected loads. 14. The LOAD POWER lamp (LP1) illuminates. 15. The Output Relay in the User Connection Bay (UCB) programmed SA LOAD ACTIVE CLOSED and connected to terminals 9 and 10 of the DMSC will close. 16. Relay RL4 energizes. This closes the normally open contacts of RL4, and relay RL3 is energized regardless of the state of the UVR contacts. Also, the RL4 normally closed contacts open and relay TR is de-energized, regardless of the state of the UVR contacts – therefore, the remote disconnect device (M1) will not close. 410071 Rev D (January 2010) Page 50 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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