Quote:
Originally Posted by Michael Corsetto
Although this is partly true, current draw isn't the whole story to tripping the 120amp main breaker. The main breaker, which is a thermal breaker, will heat up and become more susceptible to tripping as it gets hotter.
Thus, tripping the main breaker is a function of both current draw and temperature. We have set up our practice bot with a thermocouple on the main breaker and inductive current sensors on the ground pole of the PDB. We have been logging current and temperature values in an attempt to isolate tripping conditions, but even then it can be difficult to really narrow down exactly what is happening the moment the main breaker trips.
I only have a limited knowledge on this subject, I'm hoping the students on our electrical team will post a whitepaper on the subject soon.
Regardless, excited to see current sensing integrated into the PDB.
-Mike
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I understand that it's a near integration of current draw, but this now very easily lets programmers sense when they get into a pushing match. From that point, they can now decide to shift automatically or to cut off a CIM on each side. When in a pushing match, 6 CIMS easily draw about 450 Amps. The main breaker can only sustain that for a fairly short period of time before tripping (couple of seconds). However, if you drop down to 4 CIMs while in a pushing match, they'll stall out at about 350 Amps. The main breaker can sustain that for a much longer period of time.