Hardware Used:
*emonTx Arduino Shield V2, No RF
- Arduino Mega 2560
- 3x CT Current Sensor SCT 013 000
- AC 9V 200mA Philips Voltage Adapter
Power Specs:
- Voltage: 230V AC
- Frequency: 50 Hz
Firmware Used:
(Modified code for Shield as mentioned in comments)
double Vcal = 461.42; // Calibration constant for voltage input
double Ical1 = 90.9; // Calibration constant for current transformer 1
double Ical2 = 90.9; // Calibration constant for current transformer 2
double Ical3 = 90.9; // Calibration constant for current transformer 3
Serial Output:
emonTx Shield CT1234 Voltage 3 Phase example
OpenEnergyMonitor.org
Voltage: 221.47
Phase 1: 0.32 A, -22.70 W, 69.99 VA, PF=-0.324
Phase 2: 0.28 A, 0.54 W, 62.78 VA, PF=0.009
Phase 3: 0.49 A, -88.08 W, 109.38 VA, PF=-0.805
Voltage: 205.78
Phase 1: 0.33 A, -28.74 W, 67.54 VA, PF=-0.426
Phase 2: 0.27 A, 2.08 W, 56.29 VA, PF=0.037
Phase 3: 0.48 A, -80.15 W, 97.87 VA, PF=-0.819
Voltage: 186.75
Phase 1: 0.32 A, -21.25 W, 59.46 VA, PF=-0.357
Phase 2: 0.28 A, -2.58 W, 52.83 VA, PF=-0.049
Phase 3: 0.44 A, ovf W, 81.53 VA, PF=ovf
Voltage: 167.20
Phase 1: 0.28 A, -10.60 W, 46.68 VA, PF=-0.227
Phase 2: 0.28 A, -0.92 W, 46.79 VA, PF=-0.020
Phase 3: 0.38 A, -46.25 W, 64.36 VA, PF=-0.719
Voltage: 75.55
Phase 1: 0.27 A, 1.44 W, 20.34 VA, PF=0.071
Phase 2: 0.28 A, ovf W, 21.25 VA, PF=ovf
Phase 3: nan A, ovf W, nan VA, PF=nan
Voltage: 8.01
Phase 1: 0.28 A, -0.03 W, 2.25 VA, PF=-0.013
Phase 2: nan A, ovf W, nan VA, PF=nan
Phase 3: 0.28 A, ovf W, 2.27 VA, PF=ovf
Voltage: 1.82
Phase 1: 0.32 A, -0.21 W, 0.59 VA, PF=-0.356
Phase 2: 0.31 A, -0.06 W, 0.56 VA, PF=-0.100
Phase 3: 0.30 A, ovf W, 0.55 VA, PF=ovf
Voltage: 1.78
Phase 1: 0.32 A, -0.08 W, 0.57 VA, PF=-0.141
Phase 2: 0.28 A, -0.07 W, 0.50 VA, PF=-0.131
Phase 3: 0.30 A, ovf W, 0.53 VA, PF=ovf
Voltage: 0.84
Phase 1: 0.29 A, -0.00 W, 0.24 VA, PF=-0.001
Phase 2: nan A, ovf W, nan VA, PF=nan
Phase 3: 0.29 A, ovf W, 0.24 VA, PF=ovf
Voltage: 0.34
Phase 1: 0.29 A, 0.01 W, 0.10 VA, PF=0.084
Phase 2: nan A, ovf W, nan VA, PF=nan
Phase 3: 0.29 A, ovf W, 0.10 VA, PF=ovf
Problem:
- Voltage displayed in the first iteration is correct. Post that the voltage falls successively and stabilises at 0.5V~0.6V
- Current Values are reasonably correct in all iterations (ignoring random nan/ovf)
- Both Active Power and Power Factor values are incorrect and appear random
Request Glyn and fellow community members to assist