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GC Enable SA Enable Active Inactive Stop <7s Inactive Active Start < 50ms Transition to Stand Alone Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Dual Mode System Controller (DMSC) Start/Stop MicroTurbine Output MicroTurbine State Grid Connect Stand Alone Figure 25. Fast Transfer from Grid Connect to Stand Alone By default, the transition time between Grid Connect and Stand Alone modes is less than seven seconds, but will be delayed if the sensed voltage at the MicroTurbine output is maintained above 50 V peak (for example by rotating machines with high inertial loads). Additional delay time can be added to the transition time by setting the Fast Transfer Delay time through either CRMS or display panel. The transfer from Grid Connect to Stand Alone operation is extremely fast, and may not necessarily provide the desired total system functionality. For example, if an external control system toggles the input signals as noted in Figure 25, but the associated disconnect device has not completely disconnected from the utility grid within the transition time of the MicroTurbine, a fault condition may exist that could damage equipment. For this reason, the operation of the input signals should assure that conditions are right for the Fast Transfer operation. Capstone’s Fast Transfer firmware allows an intentional delay time between Grid Connect and Stand Alone operation by using the SA Enable and Start/Stop inputs as shown in Figure 26. For the MicroTurbine to discontinue operation in Grid Connect mode, only the GC Enable input needs to become inactive. For transition to Stand Alone operation, both the SA Enable and the Start/Stop inputs must become active (the example shows both operating at the same time, but it is possible to have either one lead the other). Until both SA Enable and Start/Stop become active, the MicroTurbine will operate in “Hot Standby” mode for up to two hours, or until the batteries are completely recharged, whichever is longer. In this Hot Standby mode, the engine is on (flame is lit) and the output contactor is open. Power from the MicroTurbine is used to recharge the batteries, as needed, but no power is exported. 410071 Rev. B (January 2009) Page 57 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 | TECH REF DMSC RB
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