All welders have a duty cycle
That is the length of time that welding can take place before the system shuts down
The time period depends on the amps setting and the higher the amps , the shorter the time
welding at 140 amps the time can be as short as 3 minutes
welding at 20 amps it can be as long as 20 minutes
the duty cycle is normally calculated at around 10% use and 90% cool down
SOURCE: slow, overheating, shuts itself off
sounds like your internal fans are taking early retirement, from all the symptoms..like running a car with no oil, you don't want to run a dell desktop without internal cooling..need to replace that fan..not too hard, actually.
SOURCE: I have a Lincoln 140 mig welder. It welds and cuts
Usually this is caused by a bad liner in the mig gun hose, or worn out guide rolls in the drive unit, or if this is not the case the speed of the wire might be set to high as this would force the wire into the weld causing the motor to heat up from resistance and shut it down on safty. Hope This Helps Don
SOURCE: My lincoln 140 welds fine
You may be exceding the duty cycle of your welder
Check your operstors manual to see how long you can weld at higher amps before giving the welder a chance to cool down
SOURCE: I have a Lincoln 120v
Check your switch terminals, if they are connected and everything looks good, then unplug the terminal and bridge the connector (bypass it) if it start turning your drive rolls then your switch it's damaged, if nothing happens then you burned the pc board.
SOURCE: receiver will play for awhile and then shut off.
Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on. Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up. You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it. If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good. If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech. Check for loose speaker connections as a root cause for intermittent shutdown.
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