Control Voltage Overamp – The Less Usual Cause


In most cases when a LV circuit is blowing a fuse it’s because one of the circuits is shorted to ground or common. Rubbed out wires, shorted components and boards etc….

But less commonly you will see the LV circuit draw high amps because of magnetic solenoids that are energized but  the mechanical pin, stem or armature is stuck.

A common example is a contactor that is stuck open. This results in high amperage because the solenoid is energized without the magnetic resistance (reactance) provided by the induced magnetic field.

Another example is a reversing valve solenoid that is not mounted or is not properly on the reversing valve stem.

You can see the same effect in any magnetic switch gear such as relays, pump down solenoids etc…

So check for short circuits first but also keep your eyes open for stuck or improperly mounted solenoids.

–Bryan

One comment

  1. Reid says:

    So what ur saying is the check amp draw of those components? Ive never been infront of a low voltage short before.

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