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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Dual Mode System Controller (DMSC) Fixed Settings The settings that are fixed, and not adjustable by the user, are described below. Phase Loss: The UVR trips on the loss of any line voltage phase A, B, or C. Phase Reversal: The UVR ensures that the DMSC phase sequence is consistent with the utility phase rotation. If incorrect phase rotation wiring is detected, the UVR will trip and grid connect operation is disallowed. The LED status indication for a phase reversal is a steady amber color (refer to Table 2). NOTE The utility, MicroTurbine and protected loads MUST ALL be connected in a consistent phase rotation sequence. Normally, this sequence is L1-L2-L3, counterclockwise. In cases where the utility phase rotation is clockwise, do one of the following: 1. Connect the incoming utility power connections to the motor-operated disconnect device to match an L1, L2, L3 counterclockwise sequence. 2. Connect the MicroTurbine(s) to the protected load side of the disconnect device with phases L2 and L3 flipped. Also, swap the wires at phase terminals B and C on the UVR in the DMSC so the UVR sees the correct counterclockwise sequence. Overvoltage: The overvoltage setpoint is fixed at 110% of the nominal voltage. The UVR trips when the average of all three line phases is greater than this setpoint for a period longer than the time delay dropout. Refer to Response Times below for a description of time delay dropout. Response Times: The UVR includes the following fixed response times: Phase Loss and Reversal – 100 ms fixed Phase Unbalance – 2 seconds fixed Overvoltage – Fixed time based on an inverse time curve. 410071 Rev. B (January 2009) Page 20 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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