Overview. The APM5 series network power meter (hereinafter referred to as the instrument) is designed according to IEC international standards, and has the functions of full power measurement, power statistics, power quality analysis (including harmonics, interharmonics, and flicker), fault recording functions (including voltage samp and sags interrupts, inrush currents, etc.), event recording functions and network communication, etc., and is mainly used for comprehensive monitoring of power supply quality of power grid. This series of instruments is equipped with a rich function of DI DO module, AO module, wireless communication module, leakage temperature measurement module, which can flexibly realize the full power measurement of the electrical circuit and the monitoring of the switching status.
Voltage input. The input voltage should not be higher than 120% of the rated input voltage of the product (100V or 110V or 400V or 690V), otherwise PT should be used; A 1A fuse must be installed at the voltage input; The wiring method of the product needs to be set according to the PT wiring method of the product.
Current input. Rated input current of 1A or 5A, requires the use of an external CT (it is recommended to use a terminal block, not a direct CT, for easy disassembly); Ensure that the input current corresponds to the voltage, the phase sequence is consistent, and the direction is consistent; If there are other instruments connected to the CT circuit used, the wiring should be in series; Before removing the current input of the product, be sure to disconnect the CT primary circuit or short the secondary circuit!
Communication wiring. The instrument provides asynchronous half-duplex RS485 communication interface, using Modbus-RTU protocol, and all kinds of data information can be transmitted on the communication line. It is recommended to use shielded twisted pair wires for communication connections, and the cross-section of each core is not less than 05mm2。When wiring, the communication line should be kept away from strong current cables or other strong electric field environments.