1. Cooling fan
As a prerequisite to ensure 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 influence of the objective factors of the reduction of the grease function in the process of use, the cooling ability of the fan is often greatly reduced, so the cooling fan should be replaced after 2-3 years.
2. Contactor/relay
As the equipment for the charging and control of the internal DC loop of the inverter (mostly seen in domestic inverter brands, foreign models are mostly replaced by thyristor slow charging circuits), the contacts of contactors (high-power inverters) or relays (low-power inverters) often produce contact ablation, virtual connection and other faults after a period of use. Therefore, in order to achieve the intention of advance prevention, it is often necessary to replace the contactor or relay in about 2 years.
3. Electrolytic capacitors
Electrolytic capacitors of various capacities (most of which are aluminum electrolytic capacitors) that carry the DC bus filter of the inverter increase with the use time, because of the loss of electrolyte, high voltage impact, and the influence of environmental temperature and humidity, the electrolytic capacitors need to be replaced after 3-4 years.
Fourth, the fuse
In the DC bus circuit of inverters of brands such as Inovance, ABB, and Sanpin, fuses are often used to play a short-circuit maintenance role. With the extension of the application time, under the influence of high current impact and temperature factors, the function of melt raw materials will mostly show degradation, resulting in undesirable problems in the inverter. For this reason, the fuse should be replaced every 7 years.
5. PCB circuit board
In fact, the PCB circuit board used inside the inverter, especially the switching power supply, voltage detection and other circuit parts, because it always needs to accept high voltage, so the electrical insulation function of the circuit PCB board will be inversely proportional with the use time, which is very unfavorable for the use of multi-layer PCB circuit board and a part of the inverter with poor workmanship. For this part, a 7-year replacement cycle should be used for this part of the circuit.
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What are the protection functions of the inverter - Sunland inverter
1. Incoming line maintenance
Incoming maintenance is the maintenance of the user's inlet end and inverter, including lightning protection maintenance, grounding maintenance, phase loss maintenance, inverted phase maintenance, unbalance maintenance, overvoltage maintenance, transformer maintenance and so on. These maintenance devices are generally installed at the input of the inverter ...
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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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Hope Sunland grid-connected PV inverter
Grid-connected photovoltaic inverter is one of the core components of solar photovoltaic power generation system, the main types are: central inverter, modular inverter, micro inverter, DC ...
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The reason for the explosion of the inverter module - Senlan inverter
1. Condensation The temperature difference in the workshop is large, and the inside of the inverter presents condensation.
2. Impact load. The load fluctuates greatly, and the output current of the inverter suddenly increases, resulting in module damage.
3. The inverter is overloaded in the start, ...
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The comprehensive application of Sunland's high-power boiler feed pump has added another classic
Recently, the "General Contracting Project of Boiler Feed Pump Frequency Conversion Technology Transformation Project of Yili Power Plant of Guoshen Group" undertaken by Hope Sunland has been successfully implemented and connected to the grid, adding another classic to the comprehensive application of Sunland's high-power boiler feed pump.
In 2020 ...
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The main circuit of the inverter application - Sunland inverter
Between the power supply and the inverter, there is a circuit breaker QF and a communication touch device KM, when the inverter does not have to for a long time. or when the equipment is overhauled, the circuit breaker is used as an isolation switch, which can block the power supply and ensure the safety of maintenance. At the same time, the circuit breaker has maintenance functions such as overcurrent and undervoltage. The main circuit of the inverter can ...
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Can the lower end of the leakage switch be connected to the inverter - Senlan
To be able to connect, you must use larger special specifications, the inverter outputs higher harmonics, and the leakage current is larger than that of conventional leakage switches, which simply trip, and requires the use of large-scale or special types of leakage switches. Many VFD manuals have instructions on the installation and selection of leakage switches.
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Inverter rectifier unit static detection mode
The method of judging the damage of a power element in the rectifier part is to manipulate the single conductivity of the rectifier element, and the positive and negative resistance values should not be consistent when the static value is general, and the specific method is as follows:
The three-phase bridge rectifier of the rectifier part may be two...
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Hope Sunland inverter application introduction
1. Motor control
The inverter is mainly used in the field of motor control, which can complete the speed control, torque control, and azimuth control of the motor. The inverter can adjust the speed and load of the motor according to the process requirements, which can improve the output power and quality.
2. Air conditioning refrigeration
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Practical installation precautions for frequency converters
When the line power supply exceeds the driver's kV-A rating by 10 times, add a line reactor.
A 3% impedance line reactor should be used to reduce power line transient voltages caused by capacitor switching, line notching, DC bus overvoltage tripping, and inverter overcurrent and overvoltage conditions. Line...
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Common problems in the use of inverter - Sunland inverter
1. Please explain the maintenance function of the inverter?
(1) After detecting the abnormal situation, the correction action will be carried out automatically, such as overcurrent loss rate prevention, regeneration overvoltage stall prevention.
(2) After detecting the abnormality, the PWM control signal of the power semiconductor device is closed, so that the motor can park automatically. As...
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Inverter water inlet maintenance method - Sunland inverter
The first step is not to turn on electricity! First open the inverter panel, wipe the inverter dry, and then use a hair dryer to dry the display, PC board, push board, power components, fans, etc., with 95% alcohol, scrub the components with 95% alcohol, and dry the hair dryer with cold air.
Step 2: After an hour, use alcohol ...
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Introduction to inverter capacitors - 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 consisting of two metal films close to each other and separated by an insulating material in the center. The characteristic of the capacitor is mainly to communicate through the DC block. The size of the capacitance is ...
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Inverter braking resistance connection method - Senlan inverter
If the drive 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 running, resulting in the equipment can not be ...
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Effect of inrush current on inverter - Senlan
In the process of repairing the inverter, we can find that because of the back electromotive force in the stator winding, the electromotive force in the synchronous generator state and the self-induced electromotive force in the self-loop rotor, the current impact will inevitably have a negative impact on the motor, the inverter (Variable-frequency ...
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Precautions for starting electrical equipment after a long holiday - Senlan
1. Do a good job of moisture-proof operations, clean up water and oil stains on site, insist on the boring environment of electrical equipment, and pay attention to preventing the inverter from being exposed.
2. Do a good job of maintenance and maintenance, take advantage of the shutdown for maintenance, clean the frequency conversion dust, and clean the frequency conversion air duct; Tighten the frequency conversion cable joint to prevent loosening, ...
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Anti-interference measures in the application of Sunland inverter
The main manifestations of the disturbance of the inverter in the application are: higher harmonics, noise and oscillation, load matching, heat generation and other problems. These disturbances are unavoidable, because the input part of the inverter is a rectifier circuit and the output part is an inverter circuit, both of which are made up of nonlinear components that play a switching effect.
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Senlan brought its products to the Guangxi International Sugar Technology and Equipment Exhibition
Recently, it is expected that Sunland will successfully participate in the 8th Guangxi World Sugar Industry Skills and Equipment Expo with excellent inverter products. According to the expected Sunland company leakage, the exhibition of the World Sugar Industry Skills and Equipment Expo, throughout the exhibition to domestic equipment manufacturers, there is no lack of foreign outstanding enterprises, exhibitors ...
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The inverter has an overvoltage phenomenon - Sunland inverter
Inverters often encounter a variety of problems during commissioning and use, during which overvoltage is the most common. After the overvoltage occurs, in order to avoid damage to the internal circuit, the overvoltage protection function of the inverter will work, so that the inverter will operate intermittently, resulting in the equipment can not be ...
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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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