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      暢合電氣
      電機綜合保護測控裝置
      CH-EP420系列

                                                                        CH-EP420系列數字式電動機保護器



      Display
      Description
      Remark

          Over Current Trip
          Operate within predefined time.

          Under Current Trip
          Operate within 3 seconds.

          Open Phase Trip
          Operate within 1.5 seconds when the unbalance rate is over 70%.

          Unbalance Trip
          Operate within 3 seconds.

          Lock Trip
          Operate within 0.5 seconds.

          Stall Trip
          Operate within 3 seconds.

          Reverse Phase Trip
          Operate within 0.1 second.

          Ground Fault Trip
          Operate within predefined time.

          Instantaneous Trip
          Operate within 0.05 seconds.

          Elapsed Time (No Trip)
          The operation time is reset when the Reset key is pressed.

          Communication Fault between Body and Display (Press the ENTER/RESET key to return to the normal mode)


      for the Motor

      External CT
      Motor Output (Less than kW)
      Current Selection S/W
      Wire Tunnel
      CT ratio
      220V
      380V
      440V
      0.7A or less
      0.5~10A
      4 times
      0.25
      - 0.1
      0.18 0.2
      0.7~1.6A
      Twice
      0.5
      - 0.25 0.55 0.6
      1.6~8A
      Once
      1 - 1.5 3 3.7
      7~100A 
      5~100A
      Once
      1 - 25 45 55
      90~120A
      0.5~10A
      Once
      30
      SCT-150
      30 55 55
      120A~160A 
      Once
      40
      SCT-200
      45 75 90
      160~240A
      Once
      60
      SCT-300
      55 110 132
      240~320A
      Once
      80
      SCT-400
      90 160 160
      320~400A
      Once
      100 500 : 5
      110 200 200
      400~480A 
      Once
      120 600 : 5
      132 250 250
      480~640A
      Once
      160 800 : 5
      160 320 320


      Analog (DC 4~20mA) Output / Communication
      1) The biggest current out of measured 3-phase currents is converted into DC 4mA~20mA
      and the current measured remotely by digital meter can be displayed.
      2) When there is no current, 4mA is sent. If the current goes beyond the predefined value,20mA is sent.


      3) When the system is the 0.5A~10A setting mode, measurement starts from 0.3A. Whenthe system is the 5A~100A setting mode, measurement starts from 3A. Thus, when the current is under 0.3A (3A), 0A is measured and output is 4mA. (To measure the load current correctly, an appropriate CT should be used). 
      Note) The allowable burden is less than 500?. 
      Considering the receiver resistance (usually 250?) and track resistance), the shielding cable should be used. 

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