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              交流接觸器怎樣選擇?

              來源:http://www.cekidots.com/ 日期:2022-01-20 發布人:admin

              1、選擇接觸器時要從工作環境出發,主要考慮下面幾個因素

              1. When selecting contactors, we should start from the working environment and mainly consider the following factors
              ①控制交流負載應選用交流接觸器,直流負載選用直流接觸器
              ① AC contactor shall be selected for controlling AC load and DC contactor shall be selected for DC load
              ②主觸頭的額定工作電流應大于等于負載電路的電流,還要注意的是接觸器主觸頭的額定工作電流是在規定的條件下(額定工作電壓、使用類別、操作頻率等)能夠正常工作的電流值,當實際使用條件不同時,這個電流值也將隨之改變。
              ② The rated working current of the main contact shall be greater than or equal to the current of the load circuit. It should also be noted that the rated working current of the main contact of the contactor is the current value that can work normally under the specified conditions (rated working voltage, use category, operation frequency, etc.). When the actual use conditions are different, this current value will also change.
              ③主觸頭的額定工作電壓應大于等于負載電路的電壓。
              ③ The rated working voltage of the main contact shall be greater than or equal to the voltage of the load circuit.
              ④線圈的額定電壓應與控制回路電壓一致
              ④ The rated voltage of the coil shall be consistent with the voltage of the control circuit
              接觸器選擇的具體步驟
              Specific steps for contactor selection
              ①選擇接觸器的類型,需要根據負載種類選擇接觸器的類型
              ① To select the type of contactor, you need to select the type of contactor according to the load type
              負載種類:一類、二類、三類、四類
              Load type: class I, class II, class III and class IV
              標記名:AC-1、AC-2、AC-3、
              Tagnames: ac-1, AC-2, AC-3
              控制對象:無感或徵感負載、異步電動機的啟動和停止、籠型異步電動機的運轉和運行、籠型異步電動機的啟動、反接制動、反轉和點動,
              Control objects: non inductive or characteristic load, start and stop of asynchronous motor, operation and operation of cage asynchronous motor, start, reverse braking, reverse rotation and inching of cage asynchronous motor,
              ②選擇接觸器的額定參數
              ② Select the rated parameters of the contactor
              根據被控對象和工作參數,如電壓、電流、功率、頻率等,確定接觸器的額定參數。
              Determine the rated parameters of the contactor according to the controlled object and working parameters, such as voltage, current, power, frequency, etc.\
              ABB塑殼斷路器代理
              (1)接觸器的線圈電壓,一般應低一些為好,這樣對接觸器的絕緣要求可以降低,使用時也比較安全。當控制電路簡單,使用電器比較少時,可直接選用380V或220V的電壓。若電路復雜。使用電器的個數超過5個時,可選用36V或110V電壓的線圈,以保證安全。但為了方便和減少設備,常按實際電網電壓選取。
              (1) The coil voltage of the contactor should generally be lower, so that the insulation requirements of the contactor can be reduced and it is safer to use. When the control circuit is simple and few electrical appliances are used, 380V or 220V voltage can be directly selected. If the circuit is complex. When the number of electrical appliances exceeds 5, 36V or 110V coils can be selected to ensure safety. However, in order to facilitate and reduce equipment, it is often selected according to the actual grid voltage.
              (2)電動機的操作頻率不高,如壓縮機、水泵、風機、空調等,接觸器額定電流大于負載額定電流即可。
              (2) The operating frequency of the motor is not high, such as compressor, water pump, fan, air conditioner, etc. the rated current of the contactor is greater than the rated current of the load.
              (3)對重任務型電動機,如機床主電動機、升降設備等,選用時接觸器額定電流大于電動機的額定電流
              (3) For heavy duty motors, such as machine tool main motors and lifting equipment, when selected, the rated current of the contactor is greater than the rated current of the motor
              (4)對特種用途電動機。經常運行于啟動反轉的狀態時,接觸器大致可按電壽命及啟動電流選用,可選CJ10Z、CJ12、
              (4) For special purpose motors. When it often operates in the state of start reversal, the contactor can be selected according to the electrical life and starting current, and cj10z, cj12
              (5)用接觸器對變壓器進行控制時,應考慮浪涌電流的大小。例如電焊機,一般可按變壓器額定電流的2倍選取接觸器,如CJT1、CJ20等。
              (5) When controlling the transformer with contactor, the magnitude of surge current shall be considered. For example, for electric welding machines, contactors can generally be selected according to twice the rated current of the transformer, such as cjt1, cj20, etc.
              (6)接觸器的額定電流是指接觸器在長期工作下的最大允許電流,持續時間≤8H,且安裝于敞開的控制板上,如果冷卻條件較差,選用接觸器時,接觸器的額定電流按負載額定電流的1.1-1.2倍選取。
              (6) The rated current of the contactor refers to the maximum allowable current of the contactor under long-term operation, with duration ≤ 8h, and installed on the open control board. If the cooling conditions are poor, when selecting the contactor, the rated current of the contactor shall be selected according to 1.1-1.2 times of the rated current of the load.
              (7)選擇接觸器的數量和種類。觸頭的數量和種類應滿足控制電路的要求。
              (7) Select the number and type of contactors. The number and type of contacts shall meet the requirements of control circuit.


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