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APPENDIX A: MODBUS PROTOCOL
100% values calculations for normalized measurements
Un =
(R40147 / R40146) * R30015 * R40149
In =
(R40145 / R40144) * R30017 * R40148
Pn =
Un*In
It =
In
Connection Mode: 1b
It =
3*In
Connection Modes: 3b, 4b, 3u, 4u
Pt =
Pn
Connection Mode: 1b
Pt =
3*Pn
Connection Modes: 3b, 4b, 3u, 4u
Fn =
R40150
Register
Content
30015
Calibration voltage
30017
Calibration current
Register table for the basic settings
Register Content
40143
Connection Mode
40144
CT Secondary
40145
CT Primary
40146
VT Secondary
40147
VT Primary
40148
Current input range (%)
40149
Voltage input range (%)
40150
Frequency nominal value T1
Measuring centres – MC320, MC330, MC350 & MC350H ‐ User's Manual
Type Ind
Values / Dependencies
T1
0
No mode
1
1b ‐ Single Phase
2
3b ‐ 3 phase 3 wire balanced
3
4b ‐ 3 phase 4 wire balanced
4 3u ‐ 3 phase 3 wire unbalanced
5 4u ‐ 3 phase 4 wire unbalanced
T4
T4
T4
T4
T16
10000 for 100%
T16
10000 for 100%
Min
1
mA
A/10
mV
V/10
5,00 200,00
2,50 100,00
Hz
10
Max P. Level
5
2
2
2
2
2
2
2
1000
2
57
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