Hi all,
I've installed one of my Flukso's to measure the energy consumption on our wharf.
Next week they are going to install a tower crane which requires an additional 64Amps peak current.
Since the measured current is converted using the 100A clamps and added up (in 3phase config); I was wondering if there is a possibility that the resulting tension could destroy the A/D converter? (The measured current is >> spec's, so Vmax of the A/D is expected to be transcend by factor x.)
Is there a zener diode in place which cuts the tension just below the Vmax of the A/D?
And what about the counter EMF tensions which will be present when the shut-off the crane's motors occur? I know we only convert currents; but can the counter EMF be induced in any way?
Regards,
Frederik Gallon
Hello Frederik,
A three-phase 400V setup with 100A clamps will show clipping at 25.4kW. Once your power consumption drops below this level, your readings should return to normal.
The clamps do indeed have a zener diode present on the output terminal with a breakdown voltage of 7.5V. This, combined with the voltage divider required for signal conditioning will protect the AVR's A/D converter. As for the EMF transients, the clamps have a low-pass filter included, which should attenuate any current spikes.
You're running a good life test for the Fluksometer. Let me know if you encounter any issues.
Cheers,
Bart.