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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Dual Mode System Controller (DMSC): User’s Manual Undervoltage Relay Settings The DMSC contains an Undervoltage Relay (UVR) that determines whether and/or when to isolate the MicroTurbine and protected loads from the utility grid (see Figure 5). The UVR settings can only be changed from inside the DMSC cabinet, and its function is independent of the protective functions within the MicroTurbine. Undervoltage Percentage Setting Nominal Voltage Setting Unbalance Setting UVR LED Undervoltage Time Delay Setting Time Delay Restart Setting Figure 5. DMSC Undervoltage Relay The UVR is a microprocessor-based relay that provides the logic to isolate the MicroTurbine and protected loads from the utility grid in the event of a phase loss, phase reversal, phase unbalance, undervoltage, or overvoltage fault. The UVR is energized when the phase sequence and all voltages are correct. Any one of the five fault conditions will de-energize (“trip”) the UVR. The UVR has dials for user-adjustable settings and a status indicator LED. The UVR is tripped when a phase or voltage parameter rises above or drops below a setpoint for a specific period of time. For an undervoltage fault, the UVR provides a user-adjustable time delay to prevent nuisance tripping caused by momentary voltage fluctuations. The length of time that the UVR takes to power up and restart after a fault is also adjustable by the user. The other response times, or time delays in response to phase or voltage faults, are fixed settings in the UVR. 400023 Rev A (October 2008) Page 20 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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