IP706 KEBA Central Controller

IP706 common-mode voltage through the asymmetrical circuit can be converted to differential mode voltage, affecting the measurement and control signals, resulting in component damage (this is the main reason for the high rate of damage to some system I / O module), this common-mode interference can be DC, can also be AC. Differential mode interference refers to the role of the signal between the poles of the interference voltage, mainly by the electromagnetic field in the space between the signal coupling inductance and by the unbalanced circuit to convert the common mode interference formed, this interference is superimposed on the signal, directly affecting the measurement and control accuracy.

IP706 space radiation electromagnetic field (EMI) is mainly generated by the power network, the transient process of electrical equipment, lightning, radio broadcasting, television, radar, high-frequency induction heating equipment, etc., usually referred to as radiated interference, its distribution is extremely complex. If the PLC system is placed in its radio frequency field, it will be subject to radiation interference, the impact of which is mainly through two paths: one is directly to the PLC internal radiation, by the circuit inductance of the interference; the second is to the PLC communication network, the radiation, by the communication line inductance of the introduction of interference. Radiation interference with the field equipment layout and equipment generated by the size of the electromagnetic field, especially the frequency, generally through the setting of shielded cables and PLC local shielding and high-voltage discharge components for protection

IP706 normal power supply are powered by the grid, due to the wide coverage of the grid, it will be subject to all the space electromagnetic interference and the induction of voltage and current on the line, in particular, the internal changes in the grid, switching operation surge, large-scale power equipment starting and stopping, AC and DC drives caused by harmonics, grid short-circuit transient impacts, and so on, through the transmission line to the original side of the power supply. PLC power supply is usually isolated power supply, but because of its mechanism and manufacturing process and other factors make its isolation is not ideal. In fact, due to the existence of distributed parameters, especially distributed capacitance, absolute isolation is impossible.