Measurement |
Display
|
Shows real-time measurement data on the LCD screen |
Shows measured values using bar graphs |
|
General
|
Samples/cycle |
Voltage: 512 samples/cycle |
Current: 128 samples/cycle |
Frequency measuring range |
42–65 Hz |
True RMS measurement |
Voltage/Current: 0.2% Reading |
Residual voltage1,Residual current2 |
|
Demand, peak demand, predicted demand3,4 |
|
Maximum/Minimum values |
|
Energy
|
Received energy, Delivered energy |
IEC 62053-22 Class 0.5S |
Net energy (Received energy - Delivered energy) |
IEC 62053-22 Class 0.5S |
Total(Sum) energy (Received energy + Delivered energy) |
IEC 62053-22 Class 0.5S |
Power Quality
|
Voltage/Current harmonics |
Up to the 50th order |
Voltage/Current THD5, Current TDD6 |
Up to the 50th order |
Crest factor4,7,K–factor4,8 |
– |
Voltage/Current unbalance4 |
IEC 61000–4–30, NEMA MG1 |
Voltage/Current phasor4 |
– |
Voltage/Current waveforms4 |
64 samples/cycle, 2 cycles of waveforms |
Event
|
Detection of fuse fail, phase open, blackout, and over-temperature events |
|
Maximum number of event logs |
50 |
Temperature |
Temperature9 of Accura 3300E |
Measured with the temperature sensor
intergrated into the MCU |
Communication
|
RS–485 Communication
|
Communicates with the host system using the Modbus RTU protocol |
1,200 / 2,400 / 4,800 / 9,600 / 19,200 / 38,400 / 57,600 / 115,200 10 bps |
Power Supply |
Power supply voltage11 |
AC 100 – 240 V 50/60 Hz, DC 100 – 300 V ,CAT ¥± |
1. The residual voltage is the RMS voltage value obtained by summing three-phase voltages in the time domain.
2. The residual current is three times the zero-sequence current value of fundamental components. When harmonics are
absent, the residual current equals the RMS current obtained by summing three-phase currents in the time domain.
3. The predicted demand is calculated based on thermal demand, and the response speed of thermal demand can be set.
4. The data are not displayed on the LCD screen of Accura 3300E and are provided only via communication.
instantaneously during aggregation intervals. Thus, it allows for accurate trend analysis of voltage,
current and power quality.
5. THD(Total harmonic distortion). Voltage THD:
, CurrentTHD:
6. TDD(Total demand distortion). Current TDD:
Where
can be set to the peak demand current(default) or
the rated current(only via communication).
7. Crest factor:
, 8. K-factor:
9. It is not for fire monitoring, but only for the reference.
10. At 115,200 bps, a master can communicate with up to 16 slave devices, and the maximum distance between the master
and the slave is 600 m.
11. The device conforms to UL standards for the tested AC power supply voltage.