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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) Note that if the utility voltage experiences disturbances outside the protective relay limits during the reconnect time delay, the microturbine will wait until sensed voltage is back within limits and then restart the reconnect sequence. Also note that the microturbine may not continue in Hot Standby for more than two hours, and will shut down if it is not able to either transition to Grid Connect mode or if it is not commanded to go back to Stand Alone operation. Also note that Capstone has included a second timer that is initiated when the SA Enable signal goes inactive, in order to prevent repeated cycling between Stand Alone and Hot Standby modes. If the microturbine is commanded to transition to Hot Standby, and subsequently is commanded to return to Stand Alone, this second timer delays transition back to Hot Standby for ten minutes after the initial SA Enable signal went inactive. Since some types of loads require a minimum power off period before its power is re-applied, Capstone microturbine firmware has a function to insert a time delay between stopping its power output and disabling its SA-load signal. This Fast Transfer Delay time has a default value of 0, and can be set through either CRMS or display panel. External Controller Concerns Since control of the microturbine is now being set by external signals, it is important that the logic and sequence of operations be correct to avoid misapplication. Externally connecting a microturbine operating in Stand Alone mode to an energized utility grid may cause damage to loads that are being powered by the microturbine if they are not reconnected in phase with the utility source. Other equipment may also be damaged as a result, including the distribution system and even the microturbine itself. To avoid this, make sure that power connection is not made to a utility source when the microturbine is operating in Stand Alone mode. WARNING Causing the Grid Connect and Stand Alone enable inputs to be connected at the same time will cause automatic shutdown of the microturbine and faults to be logged. To avoid this, make sure the control logic to the mode- enable inputs does not allow simultaneous activation of Grid Connect and Stand Alone enable signals. CAUTION Commanding the microturbine to operate in an incorrect mode will also cause it to automatically shut down and log the appropriate fault history. For example, the microturbine will not provide voltage output to support a Stand Alone load if it is commanded to operate in Grid Connect mode. To avoid this, make sure the control logic is enabling the correct mode of operation. CAUTION Commanding a microturbine to reconnect to the utility grid may violate utility interconnection regulations that require a manual reconnect procedure. To avoid this, any external control logic must be commanded to operate in accordance with local utility interconnection regulations. CAUTION 410071 Rev D (January 2010) Page 60 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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