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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(shù)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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