AVAILABLE MEASUREMENTS
RS485 Modbus RTU connection: terminals 3 (A+), 4 (B-), 1 (GND)
The device provides power measurements in all 4 quadrants. The sign conventions used in the product are based on the “IEC sign convention for power factor” and are summarised in the following image:
PRODUCT FEATURES
Active power imported/consumed Quadrant 1
W (+)
VAR (+)
PF (+)
Active power Produced Quadrant 2
W (-)
VAR (+)
PF (-)
Active power exported/produced Quadrant 3
W (-)
VAR (-)
PF (-)
Active power imported/consumed Quadrant 4
W (+)
VAR (-)
PF (+)
Using the configuration software or by adjusting the designated registers, the following functions can be configured:
The Modbus address, baud rate, parity, and response time can be set.
Input/output
- Measurement method [Reg. 40008]
- Enable energy storage in flash memory [Reg. 40008]
- Channel for frequency calculation [Reg. 40008]
- Transformation ratio for voltage and current [Reg. 40009 - 40011]
- Measurement filtering [Reg. 40007]
- Display threshold for current and power [Reg. 40013]
- Choice: “Power factor” I have technically translated as power factor (PF); that is the usual Dutch term in electrical measurements.
- Usage: “Real Power” is translated here as real power . In technical documentation, this is often referred to as active power , especially when the unit is W.
Three variants available:
QI- POWER-485-50
QI- POWER-485-100
QI- POWER-485-300
Our offering Power measurements.
Single-phase power meter
QE-POWER-T - Technical specifications
| QI-POWER-485 / QI-POWER-485-100 / QI-POWER-485-300 – Technical specifications | |
| Electrical properties | |
| Supply voltage | 9–30 Vdc with protection against reverse polarity and overtemperature |
| Power consumption | 1.3 W |
| Max. measurement voltage | 80 Vac, 100 Vdc |
| Measurement type | TRMS (AC) / DC |
| Measurement frequency | DC or 1–400 Hz |
| Accuracy class @25 °C up to 200 Hz | Voltage,
current, active power: <0.5% F.S. Frequency: ≤0.1 Hz Energy: ±1% of the measured value Vpeak, Ipeak: <5% F.S. |
| Crest factor | 1.8 (for current measurement) |
| Sampling rate | 11k samples/s |
| Input impedance | 1 MΩ |
| Overvoltage category | Cat
III up to 600 V Cat II up to 1000 V |
| Insulation | 3 kV
on non-connected cable for current measurement 4 kV for voltage measurement (reinforced insulation relative to power supply and RS485 serial interface) |
| THD | Available for measured currents greater than 15% of F.S. |
| Communication interface | RS485 Modbus RTU |
| Communication properties | |
| Protocol | Modbus RTU |
| Baud rate | 1200–115200 bps (standard 9600) |
| Addresses | 1–247 (standard 1) |
| Data format | 1 start bit, 8 data bits, NO/ODD/EVEN parity (standard no parity) |
| Response time | 1–1000 ms |
| Connection | Via removable 4-pin terminal |
| General data | |
| Operating temperature | -15–60 °C |
| Storage temperature | -40–85 °C |
| Relative humidity | 10–90% non-condensing |
| Altitude | Up to 2000 m above sea level |
| Temperature coefficient | < 200 ppm/°C |
| Protection class | IP20 |
Electrical installation: point of attention
The conductor must be placed as close as possible to the centre of the product to ensure correct current measurement.The direction of current is indicated by the designation P1 and, if present, by the arrow printed on the product.
| Property | QI-POWER-485 | QI-POWER-485-300 |
| Measurable AC/DC current range | up to 50 A RMS | up to 300 A RMS |
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