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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Dual Mode System Controller (DMSC) Power Connections The real power and line current requirements of protected loads must be less than the real power and line current rating of the MicroTurbine (or MultiPac) to support protected loads in Stand Alone operation. Consult the MicroTurbine Performance Technical Reference (410005 for C60 or 410048 for C65) or the C200 Technical Reference Guide (410066) for power ratings at the local temperature and elevation. The in-rush current of the protected loads must also be considered when sizing the MicroTurbine. Some load types are sensitive to phase sequence and may operate incorrectly or unsafely when connected to a source of incorrect phase sequence. Before operating protected loads, make sure that the utility supply and MicroTurbine are connected to the DMSC in a consistent L1-L2-L3 counterclockwise phase sequence, and protected loads are compatible with this sequence. The undervoltage relay will prevent Grid Connect operation unless the utility phase sequence is L1-L2-L3 counterclockwise. For MultiPac installations, interconnections between the MicroTurbines must be made in accordance with the C60/C65 MultiPac Operation Technical Reference (410032), or the C200 Technical Reference Guide (410066). For information on electrical wiring for utility and protected loads, refer to the C60/C65 Electrical Installation Technical Reference (410009), or the C200 Technical Reference Guide (410066). Line Voltage Application Guidelines The DMSC requires input voltage in the range of 400 to 500 VAC to operate. For Dual Mode installations where utility line voltage is within this range, only a direct connection to the DMSC line input terminals (TB L1, L2, and L3) is required, as shown in Figure 9. However, a potential transformer will need to be connected between the utility line and the DMSC in sites where the line voltage is outside the operating range of the DMSC. Figure 13 contains a diagram that illustrates a DMSC connection in which the voltage source for the DMSC is 208 VAC. This also requires a power transformer between the protected loads and the MicroTurbine, since the MicroTurbine output is 400 to 480 VAC. In the example shown in Figure 13, a potential transformer is used to step up the input voltage to 480 VAC for the DMSC. Make sure to select an output voltage from the transformer that matches one of the nominal voltage settings on the UVR from 400 to 480 V. The individual settings on the UVR within this range are 400, 440, 460, and 480. Refer to the Undervoltage Relay Settings section above. 410071 Rev. B (January 2009) Page 32 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. WARNING All sources of electrical power to the DMSC cabinet MUST BE isolated prior to opening the cabinet door. This includes both the electrical utility grid, and the MicroTurbine.PDF Image | TECH REF DMSC RB
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