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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Dual Mode System Controller (DMSC): User’s Manual 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 6). • 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. 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 determined to be other than L1-L2-L3, counterclockwise, the MicroTurbine, disconnect device, UVR, and protected load connections must ALL be re-wired for consistent phase rotation with the utility. • 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. Adjustable Settings Settings that are adjustable by the user are described in Table 6. Table 6. Undervoltage Relay Adjustable Settings Parameter Settings UVR Dial Undervoltage 80 to 95% of nominal voltage (Suggested setting = 85%) The UVR trips when the average of all three lines is less than the adjusted setpoint for a period longer than the adjustable time delay. UNDERVOLTAGE Nominal Voltage 208, 220, 230, 240, 400, 440, 460, 480 V This must be set to the actual three-phase voltage before line voltage is applied to the DMSC. DO NOT adjust this setting with line voltage applied. NOMINAL VOLTAGE 400023 Rev A (October 2008) Page 21 of 27 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) USER’S MANUAL
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