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电机综合保护测控装置
CH-EP420系列

                                                                  CH-EP420系列数字式电动机保护器



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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