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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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