The use of frequency converter:
1, working temperature. Frequency converter is a high-power electronic components, very susceptible to the impact of the operating temperature, the general requirements of the product is 0 ~ 55 ℃, but in order to ensure safe and reliable work, the use of should be considered to leave room for maneuver, it is best to control the following 40 ℃. In the control box, the frequency converter should generally be installed in the upper part of the box, and strictly comply with the installation requirements of the product specification, absolutely do not allow the heat-generating components or easy to heat the components installed close to the bottom of the frequency converter.
2, the ambient temperature. When the temperature is too high and the temperature change is large, the inverter is easy to condensation phenomenon inside, its insulation efficiency will be greatly reduced, and may even cause a short-circuit accident. If necessary, must increase the desiccant and heater in the box.
3), corrosive gases. Use of the environment if the concentration of corrosive gases, not only will corrode the components of the leads, printed circuit boards, etc., but also accelerate the aging of plastic devices, reducing the insulation effectiveness, in this case, the control box should be made into a closed structure, and gas exchange.
4, vibration and shock. Control cabinets equipped with inverters are subject to mechanical vibration and shock, will cause poor electrical contact. In addition to improve the mechanical strength of the control cabinet, away from the source of vibration and impact sources, should also use anti-vibration rubber pads to fix the control cabinet outside and inside the electromagnetic switch and other components that generate vibration. Device implementation for some time, it should be checked and maintained.
5, the frequency converter should be installed inside the control cabinet.
6, the frequency converter is best installed in the middle of the control cabinet; the frequency converter should be installed vertically, directly above and below to avoid the installation of large components that may block the exhaust and air intake.
7. The minimum distance between the upper and lower edges of the frequency converter and the top and bottom of the control cabinet, or the partition, or the large components that must be installed, should be more than 300 mm.
8. If the special user needs to take off the keyboard in use, the keyboard hole of the frequency converter panel must be strictly sealed with adhesive tape or replaced by a false panel, to prevent a large amount of dust from entering the frequency converter.
9, in a dusty place, especially more metal dust, flocculent places to use the inverter, the overall requirements of the control cabinet overall sealing, specially designed air inlet and outlet for ventilation; control cabinet top should have a protective net and protective lid outlet; control cabinet bottom should have a bottom plate and air inlet, inlet and outlet holes, and the installation of dust nets.
10, most of the inverter manufacturers internal printed boards, metal structural parts are not moisture moisture mold special treatment, if the frequency converter for a long time in a poor working environment, metal structural parts are prone to rust. Conductive copper rows in the high-temperature implementation of the situation, will intensify the process of corrosion, for the microcomputer control board and drive power board on the small copper wires, corrosion will cause damage. Therefore, for the application of wet and corrosive gases containing occasions, must be used in the internal design of the frequency converter has the basic requirements, such as printed circuit boards must be used three anti-painting spray treatment, for structural components must be used in nickel-chromium plating and other treatment processes. In addition, it is also necessary to take other positive, effective and reasonable measures against moisture and corrosive gases.
Daily maintenance:
1, cooling fan
The power module of the frequency converter is the most serious heat device, the heat generated by its continuous work must be discharged in a timely manner, the general life of the fan is about 20kh ~ 40kh. According to the continuous implementation of the frequency converter converted to 3 ~ 5 years to replace the fan, to avoid faults arising from poor heat dissipation.
2, filter capacitors
Intermediate circuit filter capacitors: also known as electrolytic capacitors, the role of the capacitor: filtering rectified voltage ripple, but also in the rectifier and the inverter between the decoupling effect to eliminate mutual interference, but also to provide the necessary reactive power for the motor to withstand the great pulse current, so the use of short life expectancy, because of the work of its energy storage, so it must be powered for a long time, it continuously working to generate heat, it must be replaced. The heat generated by its continuous work plus the heat generated by the inverter itself will accelerate the drying up of its electrolyte, which directly affects the size of its capacity. Under normal circumstances, the service life of the capacitor is 5 years. It is recommended to regularly check the capacitance capacity once a year, generally its capacity to reduce more than 20% should be replaced.
3, the use of anticorrosive agents
Because of the production characteristics of some companies, the electrical m room corrosive gas concentration is too large, resulting in a lot of electrical devices due to corrosion damage (including inverters). In order to solve the above problems can be installed a set of air conditioning system, with positive pressure fresh air to improve environmental conditions. In order to reduce corrosive gases on the circuit board components of corrosion, can also require the inverter manufacturer of circuit boards for anti-corrosion processing, maintenance, but also to spray anticorrosive agent, effectively reducing the failure rate of the frequency converter, improve the use of efficiency.
In the maintenance at the same time to carefully check the frequency converter, regular power supply, with the motor working at 2hz low frequency for about 10 minutes to ensure that the frequency converter works properly.
Source
:
Injection molding
Wealth network
:0086k.
How to correctly use and maintain the frequency converter
A correct use of the frequency converter should pay attention to
1, the ambient temperature of the service life of the frequency converter has a great impact. Ambient temperature rises every
10
℃, the inverter life
halved, so the surrounding ambient temperature and inverter cooling problems must be resolved.
2, the correct wiring and lead set. Before installing the inverter, you must read the manual and master its usage,
attention
matters and wiring; after installation, then set the correct number of leads according to the use.
3.
Pay attention to the relationship between speed and head.
The choice of motor and its best working section is a more important issue.
If the inverter
device long time implementation in
5HZ
below, the motor heating has become a prominent problem.
4, V /
f
control is a constant torque adjustment. And vector control makes the output torque of the motor and the square of the voltage increase proportionally
, thus improving the output torque of the motor at low speeds.
5,
If the system adopts the frequency / frequency switching mode of implementation,
frequency output and frequency output interlock should be reliable.
And start
stop pumps,
frequency / frequency switching to stop the frequency converter,
and then operate the contactor.
Due to contact sticking and high-capacity contactor arc
extinguished takes some time, the order of the above switching, time should be considered carefully.
6, external control signal failure. Generally, there are several situations: incorrect signal mode, terminal wiring errors, incorrect parameter
setting or external signal itself has problems.
7
,
The difference between overcurrent tripping and overload tripping.
Overcurrent is mainly used to protect the inverter,
and overload is mainly used to protect
the motor. Because the capacity of the inverter sometimes need to increase than the motor capacity of one or two gears, this
case, the motor
machine overload,
inverter is not necessarily overcurrent.
Overload protection is carried out by the inverter's internal electronic thermal protection function,
when presetting the electric
electronic thermal protection, it should be accurately preset
"
current taking ratio
"
that is, the motor rated
The hundredth
fraction of the ratio of the current to the rated current of the inverter.
8
, interference problems.
1) Good grounding.
The motor and other strong power control system grounding line must be connected to the busbar reliable grounding.
The control system is best
good independent grounding, grounding resistance is less than 1
Ω
. The sensor and I/O interface masks are connected to the control ground of the control system.
⑵ Add
EMI
filters, ****mode inductors, high-frequency magnetic loops, etc. to the input power supply of the instrument.
(3) to the inverter input add
EMI
filters,
can effectively inhibit the inverter on the grid conduction interference,
add input
AC and DC reactor, can improve the power factor, reduce harmonic pollution, the overall effect is good. Some
motor and frequency converter
distance between more than
100m
occasions, need to be added in the frequency converter side of the AC output reactor, to solve the problem of leakage current caused by the output conductor to the ground
distribution of the number of quotes to protect the reduction of radiation interference to the outside.
Second, the use of frequency converter faults and processing
1
, the frequency converter frequency does not reach the normal working frequency (
40HZ
)
. A
SAMCO-i
frequency converter, through the external terminal
sub analog control, once the frequency can only reach
20HZ
, in turn, check the number of quotes,
the highest frequency and the upper limit of the frequency are
50HZ
,
it can be seen that the number of quotes
the number of quotes
the highest frequency and the upper limit of the frequency is
50HZ
,
no problem. There is no problem,
immediately change the panel to the given frequency,
then the maximum frequency can be executed to
50HZ
.
From this point of view,
the problem is in the analog input circuit or the inverter itself
original device, using a multimeter to check the thermistor, the linearity is very good, no
problem, and finally turned on the inverter to check and found that a chip capacitor is damaged, after replacing the inverter back to normal.
2
Frequent overcurrent inverter alarm
(1) caused by incorrect setting of the number of leads.
If the frequency converter acceleration time is set too short,
then the change of frequency converter output frequency is far
more than the change of motor frequency,
when the frequency converter starts,
because of the overcurrent and trip.
Adjust the acceleration
time according to the different load conditions, you can eliminate this fault.
(2) output load short-circuit,
such as a Fuji inverter start on the trip,
the output side of the contactor cable head part of the rust
etched, loose, power on the arc, resulting in protective action.
(3) Damage to the detection circuit will also show the transition alarm.
Among them, the Hall sensor is affected by environmental factors such as temperature,
humidity,
working point drift.
(4) Excessive load may also cause. For example, a Siemens
M420
inverter, due to mechanical jamming.
3
, a Siemens
6SE7036
frequency converter start after a period of time after the trip. Display
"F023"
(inverter exceeds the limit temperature
degree)
, check because the fan insurance bad cause high temperature and trip, replace the insurance.
4
,
a Siemens
6SE7036
inverter
PMU
panel LCD display letter
"E"
,
Inverter can not work normally
, press
P
keyboard and re-stopping power are invalid, check the operation manual also no relevant instructions, in checking the external
24VDC
power supply
, found that the voltage is lower, change a power supply, the inverter back to normal.
5
, inverter under-voltage, over-voltage alarm, which is caused by the main power supply; there are also machine detection circuit damage caused.
(1) such as
6SE7036
inverter
F008
fault (
Ud<min
)
,
is because of the power supply tripped the loss of power, after restoring power supply, press
P
健
reset. p> Reset.
(2) a
SAMCO-I
frequency converter shutdown overvoltage trip. The frequency converter has a lot of setup leads, if individual leads are set
improperly, it will cause the frequency converter not to work properly. Over-voltage occurs at the time of shutdown, the main reason is that the deceleration
speed time is too short (if
no braking resistor and braking unit)
motor speed is greater than the synchronous speed,
rotor electromotive force and current increase
make the motor in the power generation
state, the return energy through the variable link is connected in parallel with the high power switching tube diode < /p>
polar tube
the motor is in the power generation
state.
Polar tube flows back to the DC link, so that the DC bus
voltage rises, after adjusting the time lead, the fault is eliminated.
6
, a Siemens
MM3
frequency converter, often
"
no reason
"
stop. Turn on the power again may
may be normal again, after comparative
observation,
found that the main contactor suction after power on is not normal,
sometimes power off, jumping chaotically.
It turned out to be a switching power supply to the contactor
a filter capacitor leakage, resulting in low voltage, then if
power supply voltage is high is not a big problem, if the power supply
voltage is low will lead to contactor suction is not normal, resulting in no reason to stop.
Daily maintenance of the frequency converter:
I. Precautions
The operator must be familiar with the basic working principle of the frequency converter, functional characteristics, with the basic knowledge of electrician operation. Before checking and maintaining the frequency converter, the total power supply of the device must be cut off completely; and wait for the frequency converter Chang light completely off under the circumstances.
II. Daily inspection matters
Before powering up the frequency converter, you should check the temperature and humidity of the surrounding environment, too high a temperature will lead to frequency converter overheating alarm, which will directly lead to the frequency converter power device damage, circuit short-circuiting; too much humidity in the air will lead to the frequency converter internal short-circuiting directly. In the execution of the frequency converter, we should pay attention to whether its cooling system is normal, such as: whether the air duct exhaust is smooth, whether the fan has abnormal sound. General protection level is relatively high frequency converter such as: IP20 above the frequency converter can be directly open installation, IP20 below the frequency converter should generally be cabinet installation, so the frequency cabinet cooling effect will directly affect the normal execution of the frequency converter, the frequency converter air exhaust system such as fan rotation is smooth, the air inlet whether there is dust and clogging are our daily inspection can not be ignored place. Motor reactor, transformer and so on whether overheating, there is a strange smell; inverter and motor whether there is an abnormal ringing; inverter panel current display is too large or current changes are too large, the output UVW three-phase voltage and current balance.
III. Regular maintenance
Clean the air filter cooling duct and internal dust. Check whether the screws, bolts, and that is hanging loose, input and output reactors to ground and phase resistance is short-circuit phenomenon, the normal should be greater than tens of megohms. Conductor and insulator whether there is corrosion phenomenon, such as timely use of alcohol to wipe clean. If conditions permit, to use an oscilloscope to measure the smoothness of the switching power supply output voltage, such as: 5V, 12V, 15V, 24V and other voltages. Measure whether the square wave of each waveform of the drive circuit has distortion, and whether the UVW interphase waveform is sinusoidal. Whether the contacts of the contactor have traces of ignition, serious to follow the replacement of the same type or larger than the original capacity of the new product; to confirm the correctness of the control voltage, the sequence of protection action test; to confirm the protection of the display circuit is no abnormality; to confirm that the inverter in the separate execution of the output voltage balance.
It is recommended to check regularly and should be done once a year.
IV. Replacement of spare parts
The frequency converter consists of a variety of components, some of which after a long period of time after the work of its effectiveness will gradually reduce, aging, which is the main reason for the failure of the frequency converter, in order to ensure that the device for a long period of time the normal operation of the following devices should be replaced on a regular basis:
1. Cooling fan
The frequency converter's power module is the most serious heat generation device, its continuous work, the heat generated must be promptly replaced by a cooling fan. The heat generated by its continuous work must be discharged in a timely manner, the general fan life of about 10Kh-40Kh. According to the continuous implementation of the inverter converted to 2-3 years to replace the fan, the direct cooling fan has a two-wire and three-wire points, the two-wire fan, which a line for the positive, the other line for the negative, do not connect the wrong when replacing the three-wire fan in addition to the positive and negative poles have a detecting device, which is a positive and negative pole, but also a detection device. In addition to the positive and negative poles of the three-wire fan, there is a detection line, when replacing, pay attention, otherwise it will cause the inverter overheating alarm. AC fans are generally 220V, 380V points, replace the voltage level do not get it wrong.
2. Filter capacitors:
Intermediate circuit filter capacitors: also known as electrolytic capacitors, its main role is to smooth the DC voltage, to absorb low-frequency harmonics in the DC, the heat generated by its continuous work coupled with the heat generated by the frequency converter itself will accelerate the drying of its electrolyte, directly affecting the size of its capacity. Under normal circumstances, the service life of the capacitor is 5 years. It is recommended to regularly check the capacitance capacity once a year, generally more than 20% reduction in its capacity should be replaced.
How to use and maintain the printer correctlyNormal switch according to the instructions,
Do not adjust the machine leads because of curiosity,
Do not drop the nozzle touch, waterproof, pay attention to cleaning with solvents, etc.,
Maintenance is very simple
Depending on the environment in which you are using the how to change the next filter, generally 1 year or so to change the next can be.
Liancheng Lutong Printer Co!
0635-8685020
How to correctly use and maintain the engineHow to correctly use and maintain the engine:
1, grinding: that is, grinding
This is the basis for extending the service life, whether it is a new car or overhaul of the engine, it must be in accordance with the rules of the grinding, before being able to put into normal operation.
2, net: that is, oil net, water net, gas net and body net
Diesel and gasoline is the main engine fuel, if the diesel fuel, gasoline is not pure, it will make the precision with the body wear and tear, with the gap increased, resulting in oil leakage, oil dripping, oil supply pressure is reduced, the gap becomes larger, and even cause oil blockage, holding the shaft and burning tiles, and other serious failures. If the air contains a lot of dust, will accelerate the cylinder liner, piston and piston ring wear. If the cooling water is not pure, it will make the cooling system scale clogging, hindering the engine heat dissipation, lubrication conditions are also poor, serious wear and tear of the body. If the body appearance is not pure, will make the surface corrosion, shorten the service life.
3, enough: that is, oil enough, water enough, air enough
Diesel, gasoline and air supply is not timely or interrupted, there will be starting difficulties, poor combustion, power decline, the engine can not run normally and other phenomena. If the oil supply is insufficient or interrupted, the engine will be poorly lubricated, serious wear and tear of the body or even the phenomenon of burning tile. If the cooling water is not enough will make the machine temperature is too high, the power drop, wear and tear, reduce service life.
4, check: that is, often check the fastening parts
Because of diesel engines and gasoline engines used in the process of vibration and impact and uneven loads and other impacts, bolts, nuts are easy to loosen. There are also parts of the adjustment bolts should be checked, so as not to cause accidents due to loosening and damage to the body.
5, tune: that is, diesel or gasoline engine valve lash, gas phase, fuel supply advance angle, injection pressure and ignition timing should be checked and adjusted in a timely manner in order to ensure that the engine is often in a good state of technology, in order to save fuel and prolong service life.
6, with: that is, the correct use of the engine
Before driving, should be made to lubricate the lubrication parts of the shaft tile. After starting, you should wait until the water temperature reaches 40℃-50℃ before putting into operation. It is strictly prohibited to overload or operate at low speed for a long time. Before stopping the engine, the load should be removed to reduce the speed. Normally, the engine should be maintained regularly, so that the machine is always kept in good condition. The engine should be observed and inspected diligently, and faults should be detected and eliminated in a timely manner.
Daily maintenance steps for diesel generators:
1, regularly check and replace the diesel fuel filter and oil filter;
2, regularly clean and check the air intake filter and replace it at a fixed cycle (or replace it according to the working conditions of the site and the degree of air permeability of the air intake filter);
3, regularly check and clean the battery pack terminals. Keep the terminals clean;
4. Regularly check the charging status of the battery pack to ensure good charging effect;
5. Regularly check the status of the fan belt to ensure that there is no damage and at a normal tightness;
6. Regularly check the status of the coolant to ensure that it meets the requirements;
7. Regularly check or change the diesel engine oil to ensure that the oil level is Normal;
8, winter cold season to ensure that the unit preheating device is working properly, so that when you need to start the generator can start normally;
9, each time before the start of the diesel fuel tank to check the oil level, to maintain a full state;
10, regular cleaning of the generator set of the external surface of the dust and other dirt;
11, such as water-cooled units, but also regularly check the The loop cooling water system (pump, water, etc.) is normal, the control system is normal
Talk about how to correctly use and maintain the battery[Abstract] The battery is one of the important parts of the car. Its performance has a vital impact on the performance of the car. If the battery is not properly used and maintained, it will greatly shorten the service life of the battery. This paper briefly analyzes the common faults of the battery, and introduces in detail the correct use of the battery and the daily maintenance of the battery. [Keywords] Battery Failure Maintenance Battery is one of the important parts of the car. Its performance has a vital influence on the performance of the automobile. (2724 words left)
How to correctly use and maintain household appliances1The key to the correct use of the usual good habits, here is a brief list of points
Do not switch frequently
household appliances in use, do not touch the switch and the shell with a wet hand
household appliances are finished, cut off the power supply at any time.
Keep away from heat sources.
Repair and maintenance of household appliances
1. Dust: Dust can be said to be everywhere at home. Dust cleaning is very important
2. Temperature: the components inside the appliance damp and moldy and affect the insulation performance, will greatly shorten the service life of appliances.
3. Overload: pay attention to the rated power, several high-power appliances in the family, can not be used at the same time to avoid accidents. It is best not to use a variety of household appliances *** with a power outlet to prevent poor contact or short circuit, overloading and so on.
How to Properly Use and Maintain an iPad/iPhone BatteryBut iPad/iPhone battery life has become a topic of concern for many people recently. From the beginning, iPad/iPhone chargers can't be mixed (which has been confirmed as a rumor), but this has led to the discussion of Li-ion batteries among users. Today, with this matter, combined with some of the online methods that have been verified by a number of parties, to help you correctly understand the lithium battery, and familiar with their proper use and maintenance techniques. I hope that your work and study can bring help and convenience As for charging, I feel that the original is the best, it is very simple to put aside the information on the Internet to confirm that if the original can not then other things are not working! Apple's three-pronged plug terminal block is still very good to buy, so that can use the original charging, don't use the conversion head or something. In addition, it is best not to use USB to connect the computer charging, computer regular U port is 5V * 500ma, although the charging speed will be very fast, but are virtual power, theoretically, there is the possibility of damage to the motherboard. Jailbreaking is also the cause of huge power consumption, jailbreaking will destroy the complete system resulting in greater power consumption, which is often said not to be jailbroken will be longer than the jailbroken user battery life. Although the iPad 2 cannot be jailbroken at the moment, the iPhone 4 can be jailbroken. And iPad 2 will definitely be jailbroken in the future, so it's up to the user to decide what to do. In addition to set the necessary closure: 1: WiFi is not used to turn off, it will automatically scan around the hotspot caused by power consumption. 2: iCloud is not used to turn off all functions. 3: background programs are not used to turn off, they also accelerate the consumption of power. 4: mobile users to turn off the 3G, because it will deplete the battery and consume power. 5: brightness of the screen to manual, the high brightness of the screen will cause a large number of PS: iPhone the same reason The first 12 hours of charging is a bit aggressive, often use will make the lithium battery is always in an active state. That is to say, as long as you use it often, then it will not have a great impact (nonsense is not bought to use it?). PS. PS: The first 12 hours of charging is because most products don't have much power when you buy them, so it's true that you should charge them as soon as you buy them, but you don't have to charge them for 12 hours. The last thing I want to say is that the battery life of the iPad 2 is still very commendable, even if you don't use it according to the maintenance tips in this article, it can still provide quite a long time of battery life, which will have less impact on daily use. The iPhone 4 is more tragic, after the jailbreak basically have to charge a day, so this article maintenance tips for the iPhone 4 to help some more. In fact, you have to admire Apple's industrial design, I personally have only used the three Apple devices in the picture. Those MacBook Pro or all-in-one machines and the like have not been used much to say. Just look at these three Apple products, using ARM architecture, they are not high main frequency, but definitely can let you get an unspeakably smooth experience. Throughout the market, how many products can compete with Apple in these two aspects and have the same battery life? Clearly, Apple's success is not without reason.
How to properly use and maintain the electronic desktop scalesElectronic scales - Diamond brand daily maintenance and overhaul:
(1) Keep the electronic scale machine clean. Electronic scale is a precision measuring instruments, keep the machine clean, to extend its service life, improve the accuracy of measurement is of great significance. To maintain the electronic scale parts do not accumulate dust and oil, to maintain the activities of the joints flexible, to prevent corrosion, in the dust and corrosive gases and other harsh environments should be used in a timely manner to clear the dust, cleaning. Often check for collision, cracks, parts of the tight ligaments have no loose, if abnormal should be dealt with in a timely manner.
(2) to avoid the electronic scale by violent push and collision, impact force. Electronic scales are composed of many internal electronic components, such as integrated circuits, quartz crystals, display devices, sensors, etc., when the electronic scales are subjected to violent external forces, may damage these elements, accessories, resulting in the failure of the electronic scales, affecting the accuracy of the scale so as to affect the normal use of the scales to avoid scales and other items strongly collision or fall from a height, the display instrumentation to be gently placed, careful management, not in the strong sun for a long time in the sun, to prevent unnecessary losses. In order to prevent unnecessary losses, the weight indicator should be fixed in the place where the vibration is more intense, to take measures to reduce the vibration, so as not to affect its reliability.
(3) do not arbitrarily disassemble the parts of the electronic scale
In the normal use of electronic scales, do not arbitrarily disassemble the parts of the electronic scale, not to mention the disassembly of the sensor seals and instrumentation on the cumulative circuitry and other components, the necessary maintenance, must be carried out under the guidance of the relevant technical personnel or with a certain degree of knowledge of the maintenance to prevent the failure to expand. Electronic scale repair can find Suzhou Golden Diamond
(4) electronic weighbridge management. Electronic scales are precise and valuable instruments, it is recommended that the user to develop the necessary management system, the implementation of special, special management, special, the establishment of the necessary use and maintenance records, long-term unused to be stored in a fixed location, sun protection, moisture, dust.
(5) The battery pack should be charged in time. Electronic scales equipped with a battery pack is rechargeable batteries, its capacity is limited, long-term use or work in the display of under-power instructions, the battery should be charged in a timely manner, so as to avoid excessive discharge of the battery, affecting the service life of the battery, we must often check whether the battery packaging is damaged, whether the lead is intact in order to prevent short-circuiting, damage to batteries and electronic scales circuitry. Battery charging method, please refer to the electronic scale operating instructions or the contents of the relevant chapters of this book.