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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: C200/C1000 Fuel Gas Booster Electrical Operation The FCB sends the start command to the VFD. Once activated, the VFD supplies 3-phase power to the compressor motors. By adjusting the frequency of the power output, the VFD controls the speed of the motors to maintain optimal gas compression. Using feedback from the pressure transducer, the VFD monitors outlet pressure levels, allowing it to dynamically adjust compressor speed to regulate output pressure. The VFD uses two logic inputs, one for the run input signal, and one for FGB fault detection. The signal to start the VFD appears at the Run Input terminal on the VFD from the Enable pin on FCB connector J6. The External Fault terminal is wired in series with the FGB sensor switches. When a switch opens, the VFD senses that the FGB experienced a fault shuts down the compressor and displays a fault code and the shutoff relay is de-energized closing the fuel valves. The VFD fault display is for reference only, since fault annunciation to the turbine electronics is done through the FCB. The VFD also provides power (24 VDC) and has discrete analog input connections for the pressure transducer. The dual shutoff assembly contains two solenoid-operated valves that can be closed by an electrical signal if a system fault occurs that commands the turbine engine to shut down. This shutoff signal is transmitted by the FCB at connector J17. For additional safety, per UL specifications, a relay in the FGB is connected in the circuit between the FCB and the shutoff terminals on the dual shutoff assembly. This relay ensures that the shutoff assembly valves will be closed by an external fault occurring in the FGB even if the FCB or software fails to issue the shutoff command. The switches of the FGB sensors (high pressure, low pressure, high temperature, or overload) are wired in series with the shutoff relay. With all switches closed, 24 VDC from FCB connector J6 holds the contacts of the relay closed, completing the circuit between the FCB and the dual shutoff assembly. In the event of a system fault, the shutoff assembly can sense the 0 V shutoff command at FCB connector J17 across this closed circuit. If any one of the FGB sensors detects a fault condition, its switch opens, removing 24 V from the relay and opening the relay contacts. The shutoff assembly detects the resulting open circuit as a 0 V shutoff command, which closes the valves. In addition to the FGB reacting to on-board fault signals, the turbine electronics has been configured to report offending faults from the FGB through the FCB. Refer to Fault Codes on page 12 for details. Oil System The FGB uses oil for proper operation and maximizing useful life. Oil is used in the compression process and is removed from the compressed gas stream in a two part separation process, consisting of a primary and secondary separator. The majority of the separated oil is returned to the low pressure side of the FGB from the primary separator through an oil cooler and particulate filter. The primary oil separator is equipped with upper and lower sight glasses to allow for visual indication of the oil level. When the FGB is operating at minimum speed the oil level should be at the midpoint of the lower sight glass. At maximum compressor speed the oil level should be in the middle of the upper sight glass. 410084 Rev A (February 2011) Page 10 of 13 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 | Technical Reference C200/C1000 Fuel Gas Booster (FGB)
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