The sectional area of grounding bar is smaller than that of incoming line
Too many holes are punched in the grounding bar to reduce the cross-sectional area
Grounding and paralleling to increase grounding impedance
The bottom plate of the cabinet is installed, and the frame is not grounded
Layered grounding measures are not taken
Communication cable and strong current cable shall be laid in parallel
The shielding layer of communication line is forcibly grounded at the insulating part
DP bus is not properly fixed and shielded, and accessories for fixing and shielding cable of cu320 module are missing.
The encoder line and the device communication line are suspended at will, not fixed, and the encoder line is not shielded.
Cu320 control unit and interface module are not grounded.
The complete set of electrical transmission device is not installed with shielding accessories. The installation position is low and blocked by trunking, resulting in blocked cooling air duct and unreasonable incoming and outgoing lines of the device.
The design of cabinet incoming line position is unreasonable.
The outgoing line of the main switch adopts parallel line, which increases the contact resistance and is easy to heat.
The busbar design structure is unreasonable, the incoming and outgoing lines are disordered, and the large section line has the phenomenon of circular wiring.
The insulation spacing between busbar and baseboard, busbar and busbar, and wires of each phase is insufficient.
The sectional area of busbar is smaller than that of incoming line, and a large number of holes are punched, which further reduces the effective sectional area and leads to the reduction of ampacity.
The outgoing lines of the busbar are not provided with current limiting protection, which is easy to cause the short circuit of the whole line due to the short circuit of the small line and cause major accidents such as line fire.
The cable color is not standardized.
Strong current lines and signal lines shall be bundled together for running
The shielding layer of communication line is suspended, and the instrument is not effectively grounded
The cable cross door installation structure is unreasonable, and the wire is easy to break
Wiring for cabinet door installation shall also use trunking and classified wiring
No twisted pair shielded wire is used for the heating control wire of the temperature control module
Aluminum guide rail is used in the electrical package, and there is no grounding terminal
The grounding mode of communication line is incorrect, and the grounding effect is not obvious
The thermal resistance input signal line does not use shielded cable, and the 3-wire system or 4-wire system connection method with high measurement accuracy is not used
The strong current terminal is under the signal terminal with a small spacing
Strong wire and signal wire are laid in the same slot in parallel
Filter may not be used
If you need to use a filter, you should select the filter specification according to the actual size of the load. Here, 20A is obviously too much and does not work
The complete electrical grounding terminal is used as a fixed terminal
Why is there only one phase outgoing line for double air switches
That's all for dry goods sharing. There are still many problems that need to be observed, recorded and prevented in practical application. You can visit our website at www.tongyuhengcheng COM and customer service personnel.