Iskra MT440 - 8.1 Calculations

AppendixA:Modbusprotocol
48 User’sManual
Parameter
MODBUS
100%
value
Register Type
Reactive Power Phase L3 (Q3) 30822 T17 Pn
Reactive Power Total (Qt) 30823 T17 Pt
Apparent Power Phase L1 (S1) 30824 T16 Pn
Apparent Power Phase L2 (S2) 30825 T16 Pn
Apparent Power Phase L3 (S3) 30826 T16 Pn
Apparent Power Total (St) 30827 T16 Pt
Power Factor Phase 1 (PF1) 30828 T17 1
Power Factor Phase 2 (PF2) 30829 T17 1
Power Factor Phase 3 (PF3) 30830 T17 1
Power Factor Total (PFt) 30831 T17 1
All other MODBUS registers are a subject to change. For the latest MODBUS register
definitions go to ISKRA MIS’s web page www.iskra-mis.si
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