I am using PZEM-004 CT 100A sounds like a creaking sound when connected to a cable with a current below 10A.
I haven't connect it to PZEM. Could you let me know what's the problem is?
You could check my video in this link WhatsApp Video 2025-03-23 at 14.22.31 (1).mp4 - Google Drive
Thank you in advance
I moved your topic to an appropriate forum category @pa3461163
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Thanks in advance for your cooperation.
how are you connecting the PZEM-004 CT 100A?
you must use the CT current clamp which comes with the module even for loads less than 10amp
a different module, the PZEM-004 10A, supports direct connection to the load
I have already use ct come from the pzem. You could check in my link video.
I will make a photo and share again soon
draw a schematic showing how everything is connected?
you should not leave a CT (Current Transformer) secondary without a load - it can generate a very high voltage (see The Current Transformer)
the "creaking sound" you reported in post 1 was probably due to this high voltage being generated when the load was switched on
ALWAYS connect a CT to a burden resistor or measuring device if the load is activated
That's likely the problem.
The CT must be connected to the circuit board, that has the matching burden resistor on it.
The coil itself generates very high (arching/sparking) voltages without that burden resistor.
Leo..
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