Eaton Power Xpert Solar 1500 User Manua

Glossary62 Power Xpert Solar 1500/1670 kW Inverter MN141001EN—October 2014 www.eaton.comTerm Abbreviation / DefinitionkVA . . . . . . . . . . . . . . . . . Kilovolt • Ampere.Apparent power, the vector sum of the real (P) and reactive (jQ) AC power vectors. Also,defined as the root-mean-square (RMS) of the voltage (Vrms) times the current (Irms) insinusoidal voltages and currents of the same frequency. As applies to solar inverters, the kVArating is based upon the maximum output current, including reactive power (vars).kW . . . . . . . . . . . . . . . . . . Kilowatt (1,000 Watts).A measure of energy or power.LOTO . . . . . . . . . . . . . . . . Lockout-Tagout / Lockout/Tagout / Lockout and TagoutReferences the OSHA standard for The Control of Hazardous Energy (Lockout/Tagout), Title 29Code of Federal Regulations (CFR) Part 1910.147. In addition, 29 CFR 1910.333 sets forthrequirements to protect employees working on electric circuits and equipment.MPPT . . . . . . . . . . . . . . . . Maximum Power Point TrackingThe 1500 kW inverter operating (algorithm) state for the maximum energy harvesting of thephotovoltaic system. The MPPT point varies with solar irradiance and solar-cell temperature,amongst other factors.MSDS . . . . . . . . . . . . . . . Material Safety Data SheetNEC . . . . . . . . . . . . . . . . . National Electric Code ®Formally titled, NFPA 70: National Electrical Code.Published by the National Fire Protection Association, Inc (NFPA).The “NEC” is the world's most widely used and accepted code for electrical installations.NEMA . . . . . . . . . . . . . . . National Electrical Manufactures AssociationNFPA . . . . . . . . . . . . . . . . National Fire Protection AssociationPublishes the National Electric Code®, and other Codes and StandardsNeutral Conductor . . . . . . The conductor connected to the neutral point of a system that is intended to carry currentunder normal conditions. 1Note: A neutral conductor is a current-carrying conductor, regardless of the fact it is grounded.OCPD . . . . . . . . . . . . . . . . Overcurrent Protection Device.Typically a fuse or circuit breaker. (As applied to an inverter’s (PV) input circuits as defined bythe NEC 2001 Figure 690.1(B), fuse or CB OCPDs form the final module-strings’ combiner).OSHA . . . . . . . . . . . . . . . . Occupational Safety and Health AdministrationOSHA is part of the United States Department of labor.PCC . . . . . . . . . . . . . . . . . Point of Common Coupling (or POCC)The point at which the power production and distribution network and the customer interfaceoccurs in an interactive system. Typically, this is the load side of the power network meter. 1For photovoltaic systems, this is the point where the inverter’s output circuit connects to abuilding’s service equipment or distribution panel, or the utility distribution network in largerutility-scale PV systems.PLC . . . . . . . . . . . . . . . . . Programmable Logic ControllerA programmable logic controller (PLC) or programmable controller is a digital computer usedfor automation of electromechanical processes, such as control of power generationequipment. Unlike general-purpose computers, the PLC is designed for multiple inputs andoutput arrangements, extended temperature ranges, immunity to electrical noise, andresistance to vibration and impact. A PLC is an example of a hard real time system since outputresults must be produced in response to input conditions within a limited time, otherwiseunintended operation will result. The control programs are stored in battery-backed-up ornon-volatile memory.Power Factor . . . . . . . . . . Defined as the ratio of the real power flowing to the load or facility (kW) to the apparentpower (kVA) in the facility’s circuits.Typically expressed as a percentage, where 100% is perfect power (unity) where the kWequals the kVA and reactive power is supplied by the utility.