Electrical introduction: Distribution cabinet electrical control process flow

Power distribution cabinet electrical control process flow

1. Preparation before allocation

1. Get the drawing first review the drawing to sort out one of their own ideas, you can also check the schematic and wiring diagram to ensure that the drawing is correct and no doubt after construction. If you do not understand the place can consult the designer, so that it is conducive to wiring. The whole wiring process needs careful and serious attitude to complete.

2. Prepare all the tools, materials, and electrical components used for wiring.

(1) Common tools: Phillips screwdriver, flat-head screwdriver, wire stripper, wire crimper, wire marking machine, multimeter, etc.

(2) Material: wire number tube, ribbon, sticker, cable, terminal (OT, UT, needle nose, etc.), winding tube, terminal, M5*10 bolt, etc.

(3) Components required by the pallet (go to the warehouse to receive different types of components according to the component layout).

2. Install cable troughs.

1. Punch an M5 hole on the power board.

2. The wire groove should be vertically installed, firm and beautiful (horizontal groove and vertical groove at a right Angle)

3. Add a shock-proof flat pad when tightening bolts on the wire slot.

one Mounting rail

1. Apply for hard C-groove guide rail (specification: 1m/ root). If a soft guide is used, the elements on the card may cause shaking.

2. Cut the guide rail according to the required size and polish the burr on the cutting surface.

3. Fix the guide rails to at least three crossing points: the center position

4. The installed guide rail is parallel to the cable trough.

Four. Install electrical components. 1. Install each electrical component in strict accordance with the sequence of the component layout diagram, and check whether the model is the same. If there are multiple electrical cabinets of the same type, the order of all components must be unified to facilitate after-sales maintenance and check the drawings.

2. The larger components (frequency converters, etc.) directly fixed on the electric disk are unified with M5*10 stainless steel cross flower bolts, and the flat and spring cushion are added.

3. The components stuck on the guide rail should be firmly stuck to prevent shaking. Both ends are fixed with plugs;

4. terminating

(1) According to the terminal list on the drawing, distinguish the total number and category of each group of terminals. (

Distinction between ordinary terminal and ground terminal)

(2) In order to distinguish each group of terminals, a plug with identification plate is added to the first end of the terminal block.

(3) Add insulation baffles to the terminals at the head and end of the terminal block respectively to prevent leakage. Add a plug to prevent the terminal from falling.

(4) After installing all terminals according to the drawing, tap the front and back ends of the terminal block with pliers to make the terminals compact and neat. Check whether all terminals are installed in the same direction to prevent short circuits between terminals.

(5) According to the drawing to the terminal card serial number (purchase and terminal matching plastic terminal number)

Five. wiring

1. According to the drawings, the wiring is correct, and the wires and electrical components should be bolted, inserted or crimped firmly and reliably, and the wiring is good; And the wiring wire can not be exposed, as shown in the figure: PLC input and output end.

2. Select the color and model specifications of the wire according to the drawing prompts.

(1) Use different colors of wires to distinguish different uses, roughly divided into: three power supplies with yellow, green, red three colors. Use blue for neutral wire, yellow-green for ground wire, and black for signal electricity.

(2) Reasonable selection of the cross section of the wire.

When the cross-section of the conductor is too large, the cost of the line will be caused. When the cross section of the wire is too small, the circuit not only produces a large voltage loss and power loss during the operation of the circuit, but also often causes the wire joint to overheat, resulting in serious accidents such as wire breakage, and also limits the increase of the load in the future. According to the drawings, it is generally divided into: the cross section of the main circuit is greater than or equal to 4mm2; 2.5mm2, 1.5mm2 for 220V voltage circuit; 0.75mm2, 1mm2 for signal electrical circuit. Selection of ground wire cross section: 1.5 mm2 wire for components with small input voltage (such as PLC) and 2.5mm2 or more wire for larger components (such as frequency converters).

3. When wiring, check whether the signals at both ends of the wire correspond to avoid unnecessary errors. And the wire insulation is good, no damage, the wire on the switchboard does not need to have a connector.

4. Print line number: print correctly, legible and beautiful (line number tube white and pollution-free).

(1) The model of the selected line number tube should be consistent with the cable, and the line number tube should be inserted exactly in line with the cable.

(2) Adjust the size and section length of the line number machine: strong electric (three electric, etc.) the size is 5, section length: 22mm. Weak (signal) size is 3, section length: 18mm.

(3) Before stripping the cable, wire number. The loop number must be correct and the cable number must be in the same direction. For example, the wires of the terminal block are divided into the upper and lower rows. The first end of the upper row is outward while the bottom row is opposite. In order to facilitate the search of the loop, the wire number should be threaded at the wire head on each contact of the component. The wire number tube with an insulating end is close to the insulating end. As the picture shows:

5. Wiring requirements: (1) There is no dust and no debris on the electrical board, such as: peeling the wire, tying the lead, etc., the wiring tightness is consistent, clear and beautiful. As the picture shows:

(2) Short wiring of adjacent components does not need to enter the wire slot, and the rest of the wire is thrown into the wire slot.

(3) There is a serial connection at the terminal can be connected in the adjacent terminal plug on the conductive connection piece.

(4) Wiring has to be sequential, first with the main circuit and then with the auxiliary circuit. That is, the conductor of the main circuit (such as the three-phase five wire) is pressed under the signal line. Check whether there is any leakage after making.

6. Fastening the cable trough cover 1. The cable trough cover is the same as the cable trough. As the picture shows:

2. After the cable trough cover is clean and pollution-free, affix the component name label to the square cable trough cover

Labels can be printed with Shuofang TP60i line marking machine, select 12mm wide white stickers. Online number Adjust the size: 6, section length: 25mm can be.

Seven, tidy up the electrical cabinet.

1. The components on the control cabinet door, such as indicators, buttons, knobs, switches, etc. should be installed firmly with the hand and then the back with a small mouth rose knife to tighten to prevent future loosening.

2. The inlet and outlet wires of all components on the door are led to the switchboard with a cable tie and then wrapped around the winding tube. As the picture shows:

3. The ground wire on the electrical appliance is made into a spring shape, and the OT type end is pressed on the online head. As the picture shows:

4. When installing the filter screen of the exhaust fan on the control cabinet, be sure to remove the sponge trapped inside

5. Paste a sign on the door of the electrical cabinet such as.

(1) Be sure to clean the cabinet door before Posting the sign.

(2) Signs should be posted correctly and in the center of the door. If it is a two-door electrical cabinet, the sign should be posted on the door without a lock, and the fixed work should be done before leaving the factory. As the picture shows:

8. Self-inspection work.

1. Check all the no loop, no leakage, wrong connection phenomenon according to the drawing;

2. Check whether the conductor insulation is good;

3. Check the overall appearance is good and clean;

4. Power test; In accordance with