Circutor CVM-NET4+-MC Instruction Manual page 14

Channel 2��� 4 transformation ratios
4�4�2�1�- Reading the transformation ratios
The user has a Modbus command as extra information for reading the programmed ratios on the
device:
Note: The transformation ratios of Channel 1, (Voltage primary, Voltage secondary and Three-phase
Current Primary of Channel 1),should be read at the same time.
4�4�2�2�- Selection of harmonic distortion calculation
The device has two calculation methods for voltage and current harmonic distortion: associated with
fundamental (%d) and for RMS values (%Thd).
Use of Digital Outputs
Modbus Address
Example of the selection of the harmonic distortion rate with regard to the RMS value in Channel 2.
14
Table 7 (Cont�) : Configuration of Channel 2��� 4 transformation ratios
Modbus
Address
2B34 Primary of Channel 3 1S1 Single-phase
2B35 Primary of Channel 3 2S1 Single-phase
2B35 Primary of Channel 3 3S1 Single-phase
2B3E Primary of Channel 4 1S1 Single-phase
2B3F Primary of Channel 4 2S1 Single-phase
2B40 Primary of Channel 4 3S1 Single-phase
TX: NP 04 2710 0004 CRC
RX: NP 04 06 0000 0001 0001 0190 CRC
Table 8:Selection of harmonic distortion calculation
2774
2775
2776
2777
TX: NP 05 2775 0001 CRC
RX: NP 05 2775 0001 CRC
Variable
Variable
Channel 1 - %THD / %d
Channel 2 - %THD / %d
Channel 3 - %THD / %d
Channel 4 - %THD / %d
CVM-NET4+-MC
Valid data margin
0 to 7530 (30000)
0 to 7530 (30000)
0 to 7530 (30000)
0 to 7530 (30000)
0 to 7530 (30000)
0 to 7530 (30000)
Valid data margin
0000 : % THD
0001: %d
0000 : % THD
0001: %d
0000 : % THD
0001: %d
0000 : % THD
0001: %d
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