Your heater element probably needs to be replaced. Resistive loads don't just occasionally trip overloads, and they also shouldn't be prone to welding contacts (as opposed to inductive loads like motors). If you have tripping/welding then something is wrong with the load.Ok thanks. But I guess I still need to figure out why this happened too. the third phase was only giving me 230v between the first two instead of 400. I've checked the circuit and wiring and it looks ok.
Change the contactor itself to a bigger one putting into consideration the current. It seems that the heaters are drawing too much current therefore making the contactor to weld.Hi guys
I am looking for some help on a system which I have here. There is a temperature probe in a tank which is monitoring the temp of a liquid and the controller output is switching a 3 phase contactor on and off when the temp of the liquid drops below the setpoint and then switches the contactor back off when the setpoint is reached again. The problem is now that over the weekend the contactor welded closed and kept heating the liquid which had to be dumped. There is an over temp alarm relay output on the controller which was not connected to the circuit therefore no failsafe. I need to configure this now so that the contactor coil switches on and off as normal through the relay output of the controller for when it drops below setpoint and then switch off when setpoint is reached. But i also must now get the over temp alarm into the circuit to switch the contactor off as well. I am a little confused as to how to go about this as in should i install a safety contactor so that if contacts weld shut no power will flow, should I put in a safety relay, or change the type of temp controller with different outputs instead of relay outputs. Or maybe a logic module of some sort? The temp controller in question is an Omron E5CSV
by Duane Benson
by Duane Benson
by Jake Hertz
by Jake Hertz