Analysis of the cause of smoking and burning in the Bentley preamplifier
Thread Content
Static and dynamic simulations of the Bentley probe were carried out using a power adapter to supply 24V. Under the condition that the wires were connected correctly, the preamplifier started smoking; an analysis of the problem is requested. The power adapter used was a standard 220V-to-24V conversion module provided by the cabinet manufacturer
You had better upload the wiring diagram
The phone can’t upload pictures; I don’t know what’s going on
It must be a short circuit; the required voltage for the preamplifier’s POWER terminal is -24V, not 24V!
We considered this option as well, but during installation on site they made mistakes in the wiring; however, no burning occurred. If the power supply is connected in reverse, at most the device will not work
This post was last edited by jlshnlhj on 2018-11-16 at 15:26: “If the power supply is connected in reverse, it will just not work, right?” Not necessarily; whether the IC will burn out depends on the reverse voltage rating. Is there a polarized electrolytic capacitor? Sometimes the power supply can’t even be maintained........ When the wiring is correct, the preamplifier starts smoking; this can also be due to errors in the wiring during installation. Contradictory, right? Ask someone to help analyze the problem, but the conditions must be...... Additionally, since the preamplifier is smoking, it’s better to take it apart and take a look; this will also help you analyze it on your own.
In the static and dynamic experiments I’m conducting now, the positive and negative poles of the power supply are definitely correct. What I mean is that during previous construction work, probes had to be installed on site, and the construction crew connected the wires incorrectly
Could someone explain things from the perspective of impedance and current overload, as well as the minimum operating current of power adapters and the impedance principles related to a preamplifier setup? Thank you
The most likely scenario is AC-to-DC conversion; anything can happen during on-site work.