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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Grid Connect Operation–Capstone Models C30 and C65 6. External Power Meter Installation The Load Following and Reverse Power Flow functions require the installation of a 3-phase power meter at the point of common coupling (PCC). The PCC is defined as the point where the utilities equipment ends and the customer equipment starts. Microturbine hardware is designed to accept signals from a pulse-output power meter. The power meter requires two pulse outputs. The positive pulse output (imported/forward power) is used for load following, and the negative pulse (reverse power) output is used for Reverse Power Flow Protection (pulse is only required if Reverse Power Flow Protection is needed). The pulse-output power meter provides a contact closure pulse indicating when a specific amount of energy has passed through the meter. The quantization of energy per pulse is either fixed or programmable depending upon the meter. The +PWR (Forward Power) input for load following in the User Connection Bay (UCB) is connected as follows: • C30 requires +pulse between terminals TB1, pin 6 (GND) and TB1, pin 5 (AI-2). • C65 requires +pulse input between terminals J12, pin 13 (GND) and J12, pin 12 (PWR+). The -PWR (Reverse Power) input for reverse power protection in the User Connection Bay (UCB) is connected as follows: • C30 requires -pulse between terminals TB1, pin 6 (GND) and TB1, pin 7 (AI-3). • C65 requires -pulse input between terminals J12, pin 13 (GND) and J12, pin 11 (PWR-). There are two sets of contact closure inputs. One set provides contact pulses for forward energy flow, and the other set provides energy for reverse energy flow: • Power flow in the forward direction (toward the loads) is measured as +PWR. • Power flow in the reverse direction is measured as –PWR. A 5V wetting voltage is provided by the microturbine. The pulse power meter output contact needs to be potential free. Distances longer than 100 feet can use an interposing relay with a 24 VDC power supply. Refer to the C65 Electrical Technical Reference (410001) for pulse power meter installation and connection to the C65 microturbine. Figure 9 and Figure 10 show pulse power meter installation and connection to the C30 microturbine. 410027 Rev G (April 2013) Page 30 of 32 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 Grid Connect Operation – Capstone Model C30 and C65
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