Frequent fault maintenance fattery management method
Fractioners are commonly used to meet the requirements of a moving system, and their parameter setting is very important and, if the parameters are not set correctly, can result in the processor not working properly。
1 parameter settings
Common frequency converters, usually with a default value for each parameter, are called plant values. In the case of these parameter values, the user is able to operate in a panel operation that does not meet the requirements of most moving systems. Therefore, the following aspects of the variable parameters are to be performed by the user before using it correctly:
(1) confirms the electrical parameters, in which the variable sets the power, current, voltage, rotation, maximum frequency of the electric power, which are directly derived from the emulation of the electrical。
(2) the mode of control used by the frequency transformer, i. E. Speed control, spin-off control, pid control or other means. Following a control approach, static or dynamic identification is generally required depending on the control accuracy。
(3) sets the mode of start-up of the frequency transformer, which is set to start from the panel at the time when the plant is out, and the user can choose the method of start-up on the basis of the actual circumstances, using the panel, the external endpoint, communication, etc。
(4) the selection of a given signal, the frequency of a general variable, may also be given in a variety of ways, including panel, external, external voltage or current, mode of communication, and, of course, frequency of a variable may be given in one or more of these ways. When the above parameters are set correctly, the frequency transformer is generally able to function properly and, if a better control effect is to be obtained, the parameters can only be adapted to the actual situation。
2. Treatment of parameter setting type failures
In the event of a parameter setting type failure, the frequency transformer is not functioning properly and the parameters can normally be modified on the basis of the instructions. If not, it would be preferable to be able to restore all the parameters out of the plant value and then reset them along the above-mentioned steps, with different ways of restoring the parameters for each company's variant。
Ii. Overpressure failures
The excess voltage of the frequency transformer is concentrated on the current voltage of the straight-flow carrier. Under normal conditions, the direct current of the mutator is the average after three-phase full wave. An average direct current voltage of ud = 1. 35 u = 513 v, calculated at 380 v. At the time of the excess voltage, the storage caps of the direct flow matrix will be charged and, when the voltage is up to about 760 v, the transformer will pass the voltage protection motion. Thus, for all variants, there is a normal working voltage range, and when the voltage exceeds this range, it is likely that it will be damaged, with two types of common excess voltage。
1. Input communication power overpressure
This is when the input voltage exceeds its normal range and generally occurs on holidays when the load is light, the voltage increases or decreases and the circuits fail, when it is preferable to disconnect the power supply to check and process it。
2. Power generation type overvoltage
This is a relatively high probability, mainly due to the fact that the synchronous rate of transmission of the electric power is higher than the actual rate of transmission, leaving the electrical motor in a power-generating state, and that the frequency transformer has not installed a brake unit, which can cause this malfunction in two cases。
(1) when a transformer drags a large inertial load, the speed of the slowdown is smaller, the speed of output of the transformer is faster during the slowdown, and the speed of the load is slower by its own resistance, making the speed of the load tow motors faster than the rate of the frequency of the output of the transformer, and the motors are in the state of power generation, while the transformer does not have an energy feedback unit, thus increasing the direct flowback of the transformer to the circuit, exceeding the protection value, causing malfunctions and often occurring in the dry segment of the paper machine, which can be addressed by increasing the regenerative brake unit or modifying the parameters of the transformer to make it more lengthy in the speed reduction time. Increased regenerative brake unit functionality includes energy-consumption and direct flow carrier absorption, energy feedback. The energy-consumption type is in the direct flow circuit of the mutator and is associated with a brake resistance to control the break-up of the power pipe by detecting the direct flow matrix voltage. The direct current carrier absorption type is used in a multi-engineer transmission system, which often has one or more generators working frequently in a power-generating state, generating renewable energy that is absorbed through the combined carrier. Energy feeders are reversible, and reversible transformers feed back to the grid when renewable energy is generated。
(2) this failure may also occur when multiple electric manoeuvres are applied to the same load, mainly due to the lack of load distribution. In the case of two electric motors dragging a load, when the actual speed of one motor is greater than the synchronous rate of the other, the high-speed motor is equivalent to the original motive and the low-speed is in a state of power generation causing malfunction. Paper machines often occur in the presses and webs and are handled with load distribution controls. The modulator feature, which is in the branch of the paper machine moving speed chain, can be softened。
Iii. Overflow failure
Overflow failure can be classified as acceleration, deceleration and constant speed passing through the current. This may be due to the short speed reduction of the transformer, the mutation of the load, the uneven distribution of loads, and the short output circuits. This can generally be done by extending the speed reduction time, reducing the mutation of loads, adding energy to the brake elements, carrying out load distribution designs, and inspecting circuits. If the load transformer is disconnected or overflowed, this means that the reversible circuit of the transformer is looped and that it needs to be replaced。
Overload failure
Overloading faults include variable-frequency overloading and overloading of electric machines. This may be due to the short acceleration time, excessive direct flow brakes, low grid voltage and overloading. It is generally possible to extend the acceleration time, to extend the brake time, to check the grid voltage, etc. Overloaded, the selected electric and frequency transformers cannot drag the load or may be caused by poor mechanical lubrication. The former must replace high-power electrical and frequency transformers, and the latter must perform overhauls of the production machinery。
Other failures
1. Lack of pressure
Indicates that the power input component of the frequency transformer is problematic and needs to be checked before it can be run。
High temperature
If the motor has a temperature detection device, check the heat dispersion of the motor; the frequency transformer has an excessive temperature and check the ventilation of the frequency transformer。
Iii. Other information
Periodic inspection and maintenance of frequency transformers
1. Before the transmission of the frequency
The temperature and humidity of the surrounding environment should be detected first, with excessive temperatures leading to overheat alerts by the mutator and, in serious cases, direct damage to the transformer power unit and short circuits; too humid air leads to direct short circuits within the mutator. Be careful whether the cooling system is in production when the processor operates, e. G., whether the windwind is fluent and the windmill has an abnormal sound。
The frequency variants with a high general protection level, such as those above ip20, can be installed directly, and those below ip20 should normally be in cabinet form, so how the dispersive effect of the transformer will directly affect the normal functioning of the transformer, whether the wind vent system, such as fan rotation, is smooth, and whether there is dust and congestion in the vent is an inescapable part of our daily inspection. Emps, transformers, etc., are overheated and smelly; frequency transformers and motors have an abnormal acoustic noise; the currents of the transformer panels show large or large current variations, and the output of uvw 3 is balanced with currents。
Regular maintenance
Regular dust removal checks are carried out to check whether fans enter the wind vents and to clear air filters for cooling windways and internal dust on a monthly basis。
Periodic inspections should be carried out once a year to check whether screws, bolts and plugs are loose and whether there are short circuits to the ground and to the phase of electrical resistance entering the output, which should normally be larger than tens of mega-europes. Is there corrosion in the route and insulation, if it is to be rinsed with alcohol in time? Measuring the smoothness of circuit voltages such as: 5v, 12v, 15v, 24v, etc. From the power of the switch. The contact point of the contact point is not marked by a fire, and it is serious to replace the same model or a new object contacter greater than the original capacity; confirm the correctness of the control voltage and conduct sequenced protective action tests; confirm that the protection displays no abnormality in the circuit; and confirm the balance of the voltage output during the separate operation of the frequency。
(1) regular de- dusting of the frequency transformer, with emphasis on flow cabinets, reverse cabinets and control cabinets, where necessary, which can be removed from the flow module, reverse module and circuit boards in the control cabinet. Whether or not the wind vent is dusted or blocked by excessive dusting. After a certain period of operation, because of the high ventilation required by the processor, surface dust is so severe that it must be cleaned up regularly。
(2) opens the front and back doors of the frequency transformer, removes the back door, carefully inspects whether the hand, straight-flower platoon is deformed, corrosive, oxidized, the parent line connects with loose screws, the strong screws are loosed at each fixed point, the insulation film or insulation column is old, cracked or deformed and, if necessary, replaced in a timely manner, recalibrated and re-installed after recalibration of the rectification of the rectangular parent line。
(3) after the removal of the circuit board, parent charge, etc., the necessary preservative treatment, coating of insulation paints, and the removal of the puncture from the max when the local discharge has occurred. Insulation plates that have been insulated shall be removed from the damage, sequestered by an insulation plate of the appropriate degree near the damage, secured and tested for insulation and deemed fit for use。
(4) the normal operation and rotation of the flue cabinet, the reverse cabinet's internal fans, and, at the time of stoppage, hand-turning, to observe if the bearings are contained in a card or sound, and to replace the bearings or maintenance as necessary。
(5) a thorough examination of input, flow management and reverse, straight-flow input fast melting was carried out and the burning was found to be timely for replacement。
(6) there is a leak in the capacitors in the intermediate straight-flow circuit, whether the casings are swelling, bubbles or deformed, whether the safety valves are broken, with the conditions for testing the capacity of the capacitor, leaks of the current, resistance, etc., replacement of the capacitor that does not meet the requirements, and passivation of the new capacitor or long-term idle unused capacitor before replacement. The life cycle of filtering caps is typically five years, with some or all of the indicators of significant deviation from the detection criteria, such as capacity, leaks, stress, etc., for more than five years。
(7) electrical testing of currents, reversible diodes, gtos, using a one-size-fits-all meter to determine their positive and reverse electrical resistance values, and careful recording in a pre-established form to see whether the interpolar barrier values are normal and whether the same type of device is consistent and replaced if necessary。
(8) the primary contact pointer in the a1, a2-in-line cabinets and other assistive contacts are inspected, and it is observed that each contact point has an arc, acoustic or surface oxidation, and a condensation, and such problems should be replaced to ensure safe exposure。
(9) carefully examine whether the end platoon is ageing and loose, whether there are short-circuit hidden malfunctions, whether the connections are strong, whether the wires are broken, and whether the circuit boards are well plugged. The reliability of access to main power lines, the availability of heat oxidation at connection points, and the soundness of the site。
(10) the electro-resistor has any abnormal beeping, vibration or tasting。
