Electrical connection of concrete batching plant is a crucial and complex process that involves the collaborative work of multiple electrical components and systems. The following is a detailed introduction to the electrical connections of concrete batching plants.
Preparations Before Installing The Electrical System
For more detailed information of the installation and connection of concrete batching plant electrical system, let’s take HZS90 of LUTON GROUP as an instance. Before the installation of HZS90 concrete mixing plant, relevant technicians should carefully read the electrical system design and construction drawings to fully understand the installation process and basic control mode of the electrical control system. They also should be familiar with the working principle and wiring method of the entire concrete batching plant. This is not only conducive to the installation of the concrete batcing plant, but also essential for the subsequent system maintenance and overhaul work.
Main Electrical Components
First of all, let’s start with the main electrical components.
- Main Power Switch
The main power switch usually located in the distribution cabinet, it is used to control the main power on or off, for facilitate operation and promptly cutting off power in case of emergency electrical failure.
- Electric Motor
Concrete batching plants are usually equipped with multiple motors, such as mixing motors, feed lifting platform motors, water supply pump motors, etc. These motors need to be properly connected to the power supply and control circuits to ensure their normal operation.
- Control Circuit Components
Components of control circuit includes various control buttons, switches, relays, contractors, etc., used to control various actions and states of the concrete batching plant. These components need to be connected according to design requirements to ensure the correctness and reliability of the control circuit.
- Sensors
Sensors of concrete batching plant are various, such as pressure sensors, flow sensors, temperature sensors, etc.They are used to monitor and feedback the operating status of the equipment in real time. Sensors need to be connected to the control system so that data can be processed in time and corresponding control measures can be taken.
Determine The Orientation And Wiring Direction Of Electrical Equipment
Usually, the electrical cabinet control console of HZS90 is set in the operating room, and the location of the operating room must meet the basic principles of convenient operation and shortest wiring.
As for the location of the motor, it is usually indicated in the drawing.
The solenoid valve should be installed in an open and dry place as much as possible.
In the process of installing the sensors, the transmitter box should be with waterproof, dustproof, shockproof and other functions.
When connecting the protective wire, pay attention to connecting the shielding layer of each sensor to the grounding terminal of the power board to play an anti-interference role.
After determining the orientation of relevant electrical equipment and the direction of wiring, steel cable ducts can be added without defined regulation on their direction. To maintain the neatness of the overall wiring, try to conceal the steel cable ducts.
Wiring And Connection
Before formal wiring, the number and specifications of cables should be carefully checked and inspected to ensure that the cable quality and the insulation of the cable sheath can meet the relevant standards.
In the actual wiring stage, wiring needs to be carried out in the order as: power cable ā lighting cable ā control cable ā signal cable.
During the wiring process, strong current and weak current should be separated to avoid electromagnetic interference and adverse effects on the use of the concrete batching plant.
Clear marks should be made at both ends of every cable to ensure reliable and accurate connection during wiring process. The connection of electrical lines is particularly important. Once a virtual connection or wrong connection occurs during wiring, it will have a serious impact on the equipment.
Grounding And Lightning Protection
During the installation of the HZS90 concrete batching plant, its metal frame and the housings of various electrical appliances in the control need to be grounded. Meanwhile, the reliability of the grounding should be ensured. The power supply adopts the TN-S or TN-C-S standard, and ensures that the grounding resistance is less than or equal to 4Ī©. Once the resistance exceeds 4Ī© during operation, effective measures should be taken to immediately reduce the gronding resistance to avoid unnecessary losses.
Since the height of the concrete batching plant is relatively high, its manufacturing materials are mainly metal materials, which are very vulnerable to lightning attacks in thunderstorms. Therefore, during the installation of concrete batching plant, lightning protection must be done to avoid lightning strikes on the batching plant. In the actual installation process, a lightning rod must be installated at the highest point of the batching pant, and the protection range of the lightning rod must cover all parts of the concrete batching plant. If the lightning rod is to achieve the effect of lightning protection, a grounding point needs to be set to lead the lightning to the ground. Therefore, in the process of selecting the grounding point, it should be kept away from the installation location of the mixing plant, and ensure that there are no people or other facilities in the area. The cross-sectional area of the lightning rod grounding lead cannot be less than 16mm2, and the material can be copper wire with an insulating skin wrapped in an outer skin, which can ensure that its conductive effect can meet the requirements of lightning protection and prevent leakage of the conductive line. In addition, the grounding resistance of its grounding point cannot be greater than 10Ī©.
Electrical Connection Steps
- Power Connection
Connect the power supply to the electrical distribution cabinet of the concrete batching plant to ensure that the power supply voltage and frequency meet the equipment requirements.
- Motor Connection
Connect the motor correctly to the power supply and control circuit based on its wiring method and polarity. Ensure that the motor can start and operate normally.
- Control Circuit Connection
According to the requirements of the designs, ensure that the sensor signals can be delivered accurately to the control system. At the same time, calibrate and test the sensors to ensure the accuracy and reliability.
- Ground Connecting And Insulation
Ensure that all electric connection points are well insulated to avoid electrical circuits or electric shock accidents. At the same time, grounding treatments should be carried out in accordance with regulations to ensure personal safety and stable ooperation of equipment.
Precautions For Electrical Connection
- Avoid signal lines and control lines near large current loops.
- The power lines from the busbar to the air switch, from the air switch to the contactor, and between the contactors can be assembled without crimping terminals. For the wiring from the contactor to the motor, the power line less than 7.5KW is led from the outlet of the AC contactor from the back of the mounting plate to the terminal block at the bottom of the power cabinet, and then connected to the motor from the terminal block. The power line greater than or equal to 7.5KW is directly connected to the motor terminal from the outlet of the AC contactor through the back of the mounting plate, and the line end must be crimped with the wiring nose, and then tinned after crimping. The tinning requires complete penetration and a smooth surface. The number tube is put on the wire end, and the text is i the same direction, with the horizontal text facing upward and the vertical text facing left.
- Electrical components that require grounding must have reliable grounding, the cross-sectional area of the grounding wire must meet the requirements of drawing, the color should be yellow-green wire, and the connetcion end must be firm.
- Note that the socket and plug of the connecting cable between the power cabinet and the operating table should correspond and the plug should be kept in the control room. (Not allowed to hang outside the control room)
- No joints are allowed in all wiring lines.
- The parts where wires and cables contact the bridge cutouts require the bridge to be wrapped with rubber to protect the insulation layer of the wires.
- During the installation and commissioning process, electricians and commissioning engineers should conduct a comprehensive inspection of the line wiring to ensure that the wiring is correct and firm.
- Electricians and commissioning engineers should hand over to service engineers and require them to conduct regular inspections to reduce failures caused by loose lilnes. At the same time, customer maintenance staff should be trained and required to regularly maintain and repair the equipment according to the use and maintenanc regulations.
- Comprehensively check whether the setting value of the circuit breaker is consistent with the load.
- The detection switch for the hopper door to be closed must be installed with a magnetic inductio switch and a micro switch, and the installation position of the micro switch cannot be too advanced.
Troubleshooting Of Electrical Connecting Faults Power Failure
- Check if the power supply voltage and frequency are normal, and if there are any open or short circuit in the power supply circuit.
- Check if the motor is damaged or wired correctly, and if the motor is overloaded or overheated.
- Check if the control circuit components are damaged or if the wiring is correct, and if there are any open or short circuits in the control circuit.
- Check whether the sensor is damaged or wired correctly, and whether the sensor signal can be accuratly transmitted to the control system.
In summary, the electrical connection of concrete batching plants is a complex and critical process that requires compliance with relevant specifications and standards, and corresponding measures to ensure the correctness, safety and stability of the connection. At the same time, regular inspection and maintenance of electrical connections are also important measures to ensure the long-term stable operation of equipment.
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