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CHAPTER 10 Capstone COMMUNICATIONS Table 10-8. Connector J11 – Opto-Isolated Inputs from Wattmeter Pin Signal Parameter J11 (1) J11 (2) J11 (3) J11 (4) J11 (5) J11 (6) J11 (7) J11 (8) J11 (9) Chassis Ground DIGINSP AGND OPTO 3 (-) OPTO 3 (+) OPTO 2 (-) OPTO 2 (+) OPTO 3 (-) OPTO 3 (+) To be used for shield connections 0-5 Volt Analog Signal – NOT USED Analog Ground for J11 (2). Impedance =10 ohms Isolated return for J11 (5). Isolated. (150 VDC maximum to earth) KVAR Pulse Train from Wattmeter (+5 to +15 V, Zin= 1 kohm, Isolated) (150 VDC maximum to earth) Isolated return for J11 (7). Isolated. (150 VDC maximum to earth) Negative Power Pulse Train from Wattmeter (+5 to +15 V, Zin= 1 kohm, Isolated. (150 VDC maximum to earth) Isolated return for J11 (9). Isolated. (150 VDC maximum to earth) Positive Power Pulse Train from Wattmeter (+5 to +15 V, Zin= 1 kohm, Isolated. (150 VDC maximum to earth) Programming the Meter Scaling Constant Each power meter has an internal calibration factor supplied with the electronics. This internal calibration factor may have to be modified by multiplicative factors associated with the current and potential transformers employed between the power meter and the power wiring. Thus, the overall calibration factor seen by the microturbine is as follows: Ke =Kh /(P/R)*CTR*PTR/DIV where: Ke = Scaling constant for pulses entering the microturbine terminals, W-h/pulse Kh = A typical Kh is 1.8 W-Hr per revolution; power meter internal calibration factor, W-h/revolution (usually found on meter face). CTR = Current transformer ratio (current at power meter /current in lines); Example: A 2000A to 5A current transformer would have a CTR of 2000/5 = 400 PTR = Potential transformer ratio (voltage at power meter / voltage at bus). Example: A 480 V to 120 V potential transformer would have a PTR of 480/120 = 4 DIV = Any other division ratio applicable to the power meter. P/R = Pulse per revolution (usually found on meter face) Ke is the scaling constant that should be entered into the display controller. The power meter internal calibration factor, current transformer ratio and voltage transmitter ratio must be such that the scaling constant falls in the range 0 – 500.000 W-h/pulse. 410066 Rev C (June 2009) 10-13 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 | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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