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2.5.1.6. MultiPac Minimum Power Hybrid UPS systems will normally be operating as part of a MultiPac in order to achieve at least n+1 availability at all times. When operating in a MultiPac, the control system will check to confirm that there are a sufficient number of Hybrid UPS systems available to provide the preset minimum power demand before the LLCM's will be commanded to provide power to the load during startup. Therefore, if some units become unavailable for any reason: 2.5.2. There can be a delay waiting for sufficient systems to meet the preset Minimum Power Demand, and The entire MultiPac system will shut down if the Minimum Power Timeout Period is reached before sufficient systems become available. System Start Sequences When commanded to start from Standby Mode, there are several sequences that can result, depending on the desired UPS or High Efficiency Mode and the conditions noted above. Table 1 shows eight possible start sequences. Only start sequence 1 will immediately bring power to the critical load and immediately connect to the utility. All other sequences result in an engine start, and subsequent utility reconnection delay. While the battery state of charge will have an impact on whether the turbine is started or not, reconnection to the Utility grid does not depend on it. This is because there will be more power available for recharging when both utility and turbine are available. Note that the battery SOC of 50% can be adjusted to more or less, depending on the customer application, and is shown in the table for purposes of explanation. If the battery system is provided by others, the UPS Controller may not use state of charge from this external system to provide the logic and permissive signals to the Hybrid UPS microturbines to start and stop turbines as shown in Table 1, and therefore assumes sufficient SOC. Table 1. System Start Sequences Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual Hybrid UPS Mode Start Sequence Scenario Battery SOC Utility Voltage Turbine Start Load Connection Utility Connection Turbine Stop No Wait Wait for Turbine Start No Wait Wait for No Wait Wait for Battery SOC >50% Utility Voltage OK Utility Reconnect Delay UPS Hi Eff 1 >50% OK X X 2>50%NotOKX X XXX 3<50%OKX X X 4<50%NotOKX X XX 5 >50% OK X X X 6>50%NotOKX X XX 7<50%OKXX X 8<50%NotOKX X XX 400027 Rev B (August 2013) X X Turbine Keeps Running Page 27 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 | Capstone MicroTurbine Model C65 Hybrid UPS User's Manual
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