The commissioning of the electrical system refers to the commissioning of the entire high and low voltage system. The power supply commissioning of civil electrical projects such as general residences, schools, office buildings, hotels, and shops shall be carried out in accordance with the following provisions:
(1) Regarding the panels, boxes, cabinets with debugging elements and the main lighting distribution box with debugging elements in the distribution room, the corresponding commissioning quota of the distribution equipment system shall be fulfilled according to the power supply method
(2) Although the distribution box (board) in each user room is equipped with debugging components such as electromagnetic switches, if the manufacturer has adjusted the fixed conventional parameters and can be put into use directly without debugging by the device unit, the commissioning cost will not be calculated
The adjustment of civil energy meters is professionally handled by the power supply department. Under normal circumstances, users who order completed meters from the power supply bureau do not need to be rated for accounting and commissioning costs.
In the commissioning of the power transmission and distribution system, the projects below 1kV are applicable to all low-voltage power supply lines, including cable experiments, porcelain bottles and other complete debugging work. In this project, a circuit breaker is set on one side of the system. If there are two circuit breakers on both sides, two circuit breakers are set for the system to consider, and all debugging elements with appearances, relays, electromagnetic switches, etc. in the power supply circuit should be regarded as the debugging system. However, the power cabinet has been debugged by the manufacturer, so the distribution system is no longer debugged, only the transmission system is debugged, and the reasonable coefficient is multiplied by the transmission and distribution system commissioning quota.
Grounding resistance measurement of grounding grid: Generally, power plants or substations are connected to a bus network, which is accounted for according to a system; The self-made bus network is not connected to the independent grounding grid of the power plant. Consider another system. Each large complex has its own grounding network. Although the grounding grids are also connected at the ends, they should be accounted for according to the respective grounding grids. If it cannot be used as a grounding grid, the specific situation should be confirmed according to the experimental situation of the grounding grid.
Lightning rod grounding resistance accounting: Each lightning rod has a separate grounding network (including independent lightning rods, chimney lightning rods, etc.), which is calculated by group.
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Damage to the inverter power module of the inverter - Senland
1. Discrimination
The inverter power module mainly includes IGBT, IPM, etc., check whether the appearance has exploded, and whether there are ablation marks between the terminal and the connected printed board. Use a multimeter to check whether C-E, G-C, G-E have been passed, or use a multimeter to measure whether the resistance of P to U, V, W and N to U, V, W is inadequate.
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The difference between Sunland inverter and soft starter
What is a frequency converter?
The inverter is a converter that converts the communication electricity with fixed voltage and frequency into the communication electricity with variable voltage and frequency, which is called the inverter. It is mainly used in the local demand for speed regulation, and its output not only changes the voltage but also changes the frequency together; The soft engine is really ...
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The choice of inverter braking resistor - hope Senlan
In addition to the limitation of the maximum promised current of the special energy consumption braking unit of the inverter, the selection of the braking resistor has no clear correspondence with the braking unit, and its resistance value is mainly selected according to the size of the required braking torque.
Power...
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The servo motor is connected to the wrong wire and causes a problem - Senlan
If the three power cables of the servo motor (SM) are not connected correctly, there may be no alarm in the static state. But as soon as the motor is operated manually or actively, the motor jumps off or starts to flutter, such as jumping when the speed is added too high, the system will issue generalized faults, etc.
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Sunland inverter braking resistor connection
Assuming that the inverter has a built-in braking unit and additional braking resistors, it is important to pay attention to the correct wiring of the braking resistors. The braking resistor should be connected between the P terminal and the DB terminal, but not between the P terminal and the N terminal, otherwise the three-phase rectifier bridge will operate at full load when it is not working, resulting in the equipment being unable to ...
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Sunland - inverter operation process and factory value restoration
The general operation process is as follows:
Enter the program through the operation panel and set the parameters, and set the relevant parameter groups such as the start-stop method, operation and control form according to the requirements of the industrial control. After confirming that the wiring is correct, the no-load power on test run and ...
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Energy-saving operation method of air compressor inverter - Senland
At present, the domestic air compressor market takes the goal of energy saving, environmental protection and cost reduction as the primary demand, and the new products developed are very popular. However, economically speaking, it cannot completely replace the conventional screw air compressor with large area and large capacity in use. Therefore, the use of inverter technology to ...
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15 Inverter Definitions – Hope Sunland
1. What is frequency conversion resolution? What's the point?
In the case of digitally operated inverters, the output frequency is given in a given order, even if the frequency command is an analog signal. The smallest unit of this gradient is called the variable resolution. Change...
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Sunland SBH series high-voltage inverter eight development direction cases
The following application case of Sunland SBH series high-voltage inverter is a very comprehensive display of the eight development directions of high-voltage inverter
High-voltage inverters, petrochemicals, mining, electricity
Application plan 1 petrochemical occupation: Senlan twin ...
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Introduction to the classification method of inverter maintenance faults
1. How to distinguish between heavy faults and light faults
According to the occurrence time of inverter faults, we can divide the types of faults into two categories: sudden faults and intermittent faults:
(1) The sudden fault of inverter repair refers to the failure of the equipment when it is running, without warning.
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There is a problem with the inverter-controlled motor pressing the stop button
What happens when the inverter-controlled motor presses the abort button, and the motor is not controlled to speed up?
1. If it is a newly installed inverter, it is generally necessary to consider the wiring problem, you can first change the parameters to switch to the panel control, the panel is given the frequency, and then see if the inverter operation will appear in this ...
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The difference between vector and general use of frequency converter
1. The control accuracy of the vector type is higher than that of the general type.
2. The vector type has a large output torque at low speed, which can make the motor get a larger starting torque, and is suitable for use in the occasion of heavy load starting, such as: high-power long belt, hoist, etc. If it is used in some of the more common fields ...
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The output side of the inverter is equipped with a contactor - Sunland inverter
When the power supply and the inverter are replaced, for example, if the inverter has a problem, in order to make an emergency, let the motor be directly changed to be driven by the power frequency power supply; Perhaps the inverter is used for soft starting, and after the motor is accelerated to the power frequency speed, it is changed to be driven by the power frequency power supply.
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The difference between soft starter and inverter - Sunland inverter
Soft starter is actually a motor control device with motor soft start, soft stop, light load energy saving and a variety of maintenance functions. First of all, it is a three-opposite parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. By manipulating the conduction of three opposite parallel thyristors ...
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The difference between inverter and inverter power supply - Senland
What is a frequency converter?
Variable Frequency Drive (VFD) uses inverter technology and microelectronics to change the operating power frequency of the motor to control the power control unit of the communication motor.
The inverter is mainly composed of rectifier (from communication to DC), inverter, inverter (from DC to communication) ...
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Ensure the normal operation of the inverter in a humid environment
Due to the heavy rain and humidity in some areas recently, in order to avoid long-term power failure and the impact of wetting on the inverter, the following points can be used as various precautions before customers resume production:
1. Look inside the electrical cabinet, e.g. ...
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The inverter is regularly replaced with the device - Sunland inverter
1. Cooling fan
As a prerequisite for ensuring the normal operation of the inverter, efficient and fast in-line cooling fans have become an indispensable conversion configuration of the inverter. Because of the wear of the internal bearings of the cooling fan and the reduction of the grease function in the process of application, the cooling of the fan.
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General technical specifications for Sunland inverter SB200 series
Input rated voltage, frequency 3 phase: 380V, 50/60Hz allowable scale Voltage: 320-420V;
Voltage unbalance: <3%;
Frequency: 47 - 63 Hz Output output voltage 3 phases, 0V - input voltage, error less than 5% Output frequency scale ...
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Inverter to avoid load shock - Sunland
In the process of operation, try to ensure that the inverter (hereinafter referred to as -VFD) has a satisfactory acceleration and deceleration time, and the VFD has its own soft start function when starting or accelerating; When the power is shut down or the speed is slowed down, it has the function of soft shutdown. Add acceleration and deceleration times as much as possible within the range promised by the device. When the device requires ...
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Get to know the capacitor of the inverter - Sunland inverter
1. The capacitance is generally indicated by "C" plus a number in the circuit (e.g., C25 indicates the capacitance numbered 25).
A capacitor is a component composed of two metal films close to each other and separated by an insulating material in the center. The characteristic of the capacitor is first and foremost the communication through the DC block. The size of the capacitance is ...
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