F&F LE-03MW, User Manual

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LE-03MW CT – user manual
18
9.2 Current transformer
The current transformer ratio of the meter can be set remotely via the Modbus RTU interface or
locally using the PROG button.
To set it manually:
1) switch off and on the power supply of the meter;
2) press and hold down the PROG button;
3) release the PROG button after about 15 seconds;
4) the display will show a blinking CT value (for example 0005-5); the table of available settings is
shown below;
5) set the desired value of the current transformer ratio by pressing the button to the left or right;
6) wait until the transformer value disappears from the display.
Setting the transformer ratio via the RS485 interface requires the code value corresponding to the
selected current transformer to be written to register number 8.
Please note: The code designation of the transformer is created by writing the value of the
transformer primary current as a BCD number.
Transformer
Code designation
Hexadecimal Decimal
5/5
0x0005 5
30/ 5(*)
0x0030 48
40/5
0x0040 64
50/5
0x0050 80
60/5
0x0060 96
75/5
0x0075 117
80/ 5(*)
0x0080 128
100/5
0x0100 256
125/5
0x0125 293
150/5
0x0150 336
200/5
0x0200 512
250/5
0x0250 592
300/5
0x0300 768
400/5
0x0400 1024
500/5
0x0500 1280
600/5
0x0600 1536
750/ 5(*)
0x0750 1872
800/5
0x0800 2048
1000/5
0x1000 4096