Automatic input heating when power consumption is exceeded
Hello. Tell me, please, can the input circuit breaker heat up if the provided power is 4 kW and the consumed power is 8 kW?
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Hello. Tell me, please, can the input circuit breaker heat up if the provided power is 4 kW and the consumed power is 8 kW?
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In most cases, the machine warms up at the maximum permissible current through it, as well as with the wrong choice of the input cable section. So you yourself answered your question - excess current can cause the machine to heat up, because According to the project, both cable and input are designed for a lower value.
If the current is less than or equal to the rated current, for this machine, nothing should be heated, when the current is more than the rated current, the machine will turn off (the higher the current, the faster the trip of the thermal release). According to you, the provided power is 4 kW (18 amperes), which means (logically) that the machine should be 20 amperes, with a total power of 8 kW (36 amperes), the machine should turn off after 10 -50 seconds. If you do not have a permanent shutdown of the machine, then it is at least 36 amperes and in this case it will not heat up.
Most likely a bad contact (not tightened) of the wire in the machine. More than once I had to see how it burns out (melts) on the floor of the machine with a bad tightening of the contact.