AppendixA:Modbusprotocol
User’sManual 49
Parameter
MODBUS
Values / Dependencies
Register Type
Calibration voltage 30015 T4 mV
Calibration current 30017 T4 mA
Register table for the basic settings
Register Content Type Ind Values / Dependencies Min Max
P.
Level
40143 Connection Mode T1 0 No mode 1 5 2
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
40144 CT Secondary T4 mA 2
40145 CT Primary T4 A/10 2
40146 VT Secondary T4 mV 2
40147 VT Primary T4 V/10 2
40148 Current input
range (%)
T16 10000 for 100%
5,00 200,00 2
40149 Voltage input
range (%)
T16 10000 for 100%
2,50 100,00 2
40150 Frequency
nominal value
T1 Hz
10 1000 2
EXAMPLE of calculation using MODBUS registers and their data types:
CT Primary = R40145 (Type T4
) = 10^2 × 40 = 8028
(16)
−> 4000 A/10 = 400A
CT Secondary = R40144 (Type T4) = 10^2 × 50 = 8032
(16)
−> 5000 mA
Cal. Current = R30017 (Type T4
) = 10^2 × 50 = 8032
(16)
−> 5000 mA
Input range = R40148 (Type T16) = 10000 = 2710
(16)
−> 100,00%
In = (R40145 / R40144) * R30017 * R40148 = (400 / 5) * 5A * 100% =400A
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