A tsarin sarrafa wutar lantarki da masana'antu, akwai wani muhimmin sashi amma wanda ba a fahimta sosai ba - na'urar sadarwa ta AC. Wataƙila ka taɓa fuskantar hakan lokacin da kake mu'amala da manyan injuna, kayan aikin HVAC ko tsarin hasken wutar lantarki mai ƙarfi.
Wannan jagorar na'urar sadarwa ta AC za ta taimaka muku da sauri wajen fahimtar wannan muhimmin bangaren lantarki, alamun matsalar na'urar sadarwa ta AC da kuma dabarun maye gurbinsa, ta yadda za ku iya magance matsalolin sarrafa wutar lantarki cikin aminci.
Menene Mai Tuntuɓar AC?
Mai haɗa AC makullin sarrafawa ne na lantarki don da'irori masu sarrafawa daga nesa, musamman ya dace da kunnawa da kashe manyan da'irori masu gudana akai-akai. Ana amfani da shi galibi don farawa, tsayawa, hanzartawa, birki da juyawa da injinan AC da sauran kayan aikin wutar lantarki.
The contactor is essentially an electromagnetic switch. Its main task is to quickly and reliably connect (close) or disconnect (open) the power supply of the main circuit when the control signal is received. Its function is similar to the relay, but it is usually used to deal with larger current and voltage than the relay.
Baya ga na'urar AC, akwai kuma na'urar DC . Na'urorin DC suna amfani da wutar DC don tuƙa na'urori masu aiki da wutar lantarki kuma ana amfani da su sosai don sarrafa nauyin DC kamar motocin lantarki, forklifts da tsarin wutar lantarki na DC.
What is the difference between AC contactor and DC contactor? The main differences are the working power supply of their coils, the design of the arc extinguishing system (AC has a natural zero-crossing point, while DC does not, so DC contactor arc extinguishing requirements are higher) and the type of load they are usually used to control.
What is the Working Principle of AC Contactor?
Ka'idar aiki na mai haɗa AC ta dogara ne akan jan hankalin lantarki.
Coil energization (control voltage): When the control power supply (usually the control voltage of the AC contactor is much lower than the main circuit voltage, such as 24V, 110V, 220V, etc.) is applied to the electromagnetic coil of the contactor, the current is generated in the coil.
Generate magnetic field: Current flowing through the coil will produce a strong electromagnetic field.
Pull-in: This electromagnetic field will attract the armature (movable core) inside the contactor.
Closulli lamba: The movement of the armature drives the main contact to close. The main contacts are connected to the main circuit. After they are closed, the current of the main circuit is allowed to flow through, thereby supplying power to the load (such as the motor).
Coil power off: When the control power is removed, the electromagnetic field disappears.
release: Under the action of the spring force, the armature returns to the initial position and the main contact is disconnected, thereby cutting off the current of the main circuit and the load stops working.
How to operate the AC contactor? By simply controlling the power on and off of the coil to operate the contactor, the start and stop of the equipment connected to the main circuit (such as the motor) can be controlled.
Alamomin Rashin Aikin Mai Haɗa AC
Fahimtar alamun kurakuran na'urorin AC yana da amfani wajen gano da kuma magance matsaloli cikin lokaci da kuma guje wa ƙarin lalacewa ga kayan aiki.
Unable to pull or release: After the contactor coil is energized, the main contact is not closed (unable to start the load) or after the coil is powered off, the main contact remains closed (the load cannot stop).
Baƙon haɓaka: The humming or abnormal noise of the contactor during operation may be caused by loose iron core, damage of short-circuit ring, poor contact or improper voltage. Abnormal noise and heating are often associated, and abnormal heating of contactors can also affect their life.
Contact welding or burn: Contacts are severely heated, have a burnt smell or visible burn marks. This is usually caused by excessive load, frequent operation or insufficient contact spring pressure.
Control loop problem: The control signal has been sent, but the contactor has no response.
How to judge whether the AC contactor is damaged? By examining the above symptoms, combined with the following test steps to confirm.
Yadda za a gwada AC Contactor?
Kafin a yi gwaji ko gyaran na'urar sanyaya daki (AC contactor), a tabbatar an yanke dukkan wutar lantarki domin tabbatar da tsaro.
1. Check the coil
Objective: To check the electromagnetic coil is intact.
Methods: Use the resistance of the multimeter to measure the resistance at both ends of the coil.
Judgement: The measured resistance should be close to the coil resistance value marked on the product nameplate. If the resistance value is shown to be open (infinity), the coil is damaged.
2. Check the main contact
Objective: To check the conductivity of contacts in different states.
Hanyar:
- Release state (coil is not energized): measure the resistance at both ends of the main contact (usually the normally open contact, NO). They should be in a disconnected state (resistance infinity).
- Pull-in state (coil energized or manual pressing): How to check the conductivity of the AC contactor in the pull-in state? Manually press the armature to pull it in, and measure the resistance at both ends of the main contact again. They should be on (resistance close to 0 ohms).
3. Check the auxiliary contact
Objective: To check the switching function of auxiliary contacts (such as normally closed NC and normally open NO).
Methods: In the release and pull-in states, the resistances of the auxiliary contacts were measured respectively to ensure that they can reliably switch states.
Note: The safest way to test the AC contactor is the power-off test. If you need to test the coil voltage, please be operated by a professional.
Yadda ake Sauya Mai Haɗa AC?
Idan an tabbatar da cewa na'urar haɗin ta lalace, ana buƙatar maye gurbin na'urar haɗin AC.
1. Aikin shiri
- An kashe: Before starting to work, the power supply of the main circuit and control circuit must be completely cut off and the power test must be carried out to ensure safety.
- Record wiring: Take a clear picture of the old contactor, or draw a detailed AC contactor wiring diagram, record the position and color of all the connecting lines including the main line and the control line.
- Purchasing new contactors: Ensure that new contactors fully match old contactors in terms of rated current, rated voltage, coil voltage and contact type (e.g. unipolar AC contactors or other poles).
2. Cire tsohon mai haɗawa
Bayan an yiwa dukkan wayoyi alama, a hankali a cire wayoyi da aka haɗa zuwa manyan hanyoyin sadarwa da kuma tashoshin coil.
Loosen the fixing screw or remove the old contactor from the DIN dogo.
3. Shigar da sabon mai haɗawa
Shigar da sabon mai haɗa na'urar zuwa wurin da ya dace.
Sake haɗa dukkan wayoyi bisa ga jadawalin wayoyi masu hulɗa da na'urar AC da aka yi rikodin. Tabbatar cewa dukkan wayoyi suna da ƙarfi kuma abin dogaro, musamman wayoyi na babban da'irar, dole ne a matse su don guje wa dumamawa sakamakon rashin kyawun hulɗa.
4. Gwaji
Firstly, it is sent to the control power supply for no-load test (without connecting the main circuit load) to confirm that the pull-in and release functions are normal.
Bayan tabbatar da daidaiton, ana aika shi zuwa babban wutar lantarki na da'irar don gwajin kan kaya.
Nazarin farashi: Farashin maye gurbin na'urar AC ya bambanta dangane da samfurin, ƙimar halin yanzu, alama da farashin aiki na na'urar. Ana ba da shawarar a tuntuɓi ƙwararren mai gyaran wutar lantarki na gida.
How to Select the Right AC Contactor?
| Abubuwan La'akari | Bayani |
|---|---|
| Ƙimar wutar lantarki mai aiki (Ue) | Matsakaicin ƙarfin lantarki da babban haɗin na'urar sadarwa zai iya jurewa dole ne ya fi ko daidai da ƙarfin lantarki na kaya. |
| Rated operating current (Ie) | Wutar lantarki ta babban haɗin mai haɗawa wanda zai iya aiki na dogon lokaci a ƙarƙashin takamaiman yanayi dole ne ya fi ainihin ƙarfin aiki na kayan aiki kuma ya bar gefe. |
| Wutar lantarki | This is the control voltage of this AC contactor. Must be consistent with the supply voltage of your control loop (e.g.24VDC, 220VAC). |
| Nau'in kaya da nau'in amfani | The appropriate contactor is selected according to the load type (such as AC-1 for non-inductive or micro-inductive load, AC-3 for squirrel-cage motor start-up and power off during operation). |
| Lamba da nau'in lambobin sadarwa | Ensure that the number of main contact poles (such as unipolar AC contactors, triodes) and the required auxiliary contacts (normally open/normally closed) meet the control requirements. |
| Mitar aiki | Aiki akai-akai zai shafi rayuwar na'urar AC. Idan aikin yana yawan faruwa, ya kamata a zaɓi na'urorin da ke jure lalacewa da kuma waɗanda ke da tsawon rai. |
Kammalawa
Tare da shekaru 20+ na ƙwarewa, TONZM supports global agents through a collaborative ecosystem supported by ISO9001, CCC and CE certifications. Our global network spans 30+ countries/regions, providing end-to-end support for competitive growth.
Dangane da kayayyakin lantarki masu inganci, kamfanin TONZM ya ƙware wajen samar da MCB , MCCB , RCCB , RCBO , SPD , ATS , MTS , masu kare wutar lantarki da ƙarancin wutar lantarki , masu cire haɗin lantarki, kayayyakin Wi-Fi masu wayo, kayayyakin DC masu ɗaukar hoto, kayan aikin nuni na dijital, kayan wutar lantarki masu sauyawa da sauran kayayyaki. Yana samar da ƙwaƙwalwar ajiya mai kyau don biyan buƙatun tsarin lantarki daban-daban.
FAQ
How Long is the Service Life of An AC Contactor?
The life of the contactor is divided into mechanical life and electrical life. Mechanical life (non-electric operation) can usually reach millions of times; electrical life (charged operation) depends on the type of load and operating frequency, generally between tens of thousands to hundreds of thousands of times. Frequent high current operation will significantly shorten the electrical life.
How to Judge Whether the AC Contactor is Damaged?
By observing whether there is abnormal noise, burning smell, the main circuit can not be connected or disconnected. The most reliable method is to use a multimeter to check the coil resistance and the conductivity of the contacts in the pull-in/release state.
Can A DC Contactor Be Used for Alternating Current?
Yawanci ba a ba da shawarar yin amfani da na'urorin haɗin DC ba. Duk da cewa wasu na'urorin haɗin DC na iya aiki ba tare da son rai ba a ƙarƙashin ƙarancin ƙarfin AC, tsarin kashe wutar lantarki, ƙirar na'urar haɗin gwiwa da tsarin tsakiya an tsara su ne don halayen DC. Idan aka yi amfani da su don wutar AC, suna iya haifar da dumama na'urar haɗin gwiwa mai tsanani, rufewa mara inganci, ƙarar hayaniya, da lalacewa cikin sauri.
Does the AC Contactor Affect Heating?
Yes. During normal operation, the main contact and coil will generate heat due to the passage of current, but it should be within the rated temperature range. If the AC contactor will affect the heating? The answer is yes, and abnormal heating is usually a sign of failure, such as poor contact or coil voltage mismatch.
