140XBP00400 Schneider Rack Backplanes

140XBP00400 Schneider Rack Backplanes

140XBP00400 system grounding has three ways: floating ground, direct ground and capacitor ground. For PLC control system, it is a high-speed low-level control device, should be used directly grounded. Due to the signal cable distribution capacitance and input device filtering and other effects, the signal exchange frequency between the device is generally lower than 1MHz, so the PLC control system grounding line using a point of grounding and series connection of a point of grounding. Centralized PLC system is suitable for parallel one-point grounding method, each device’s cabinet center grounding point with a separate grounding wire to the grounding pole. 140XBP00400 device spacing is large, should be used in series one-point grounding method, with a large cross-section copper bus (or insulated cable) connected to the center of the cabinet of each device grounding point, and then the ground bus connected directly to the grounding electrode.

Grounding line with a cross-section greater than 22mm2 copper wire, the total busbar using a cross-section greater than 60mm2 copper row. Grounding resistance of the grounding electrode is less than 2Ω, the best grounding electrode buried in the building from 10?15m away, and the PLC system grounding point must be more than 10m away from the grounding point of the power equipment. 140XBP00400 signal source grounding, the shield should be grounded in the signal side; not grounded, it should be grounded in the PLC side; signal line with a connector in the middle, the shield should be firmly connected and insulated, be sure to avoid multi-point grounding. Multiple measurement point signal shielded twisted-pair cable and multi-core twisted total shielded cable connection, the shield should be connected to each other and insulated, select the appropriate grounding single-point grounding.