This phase controller uses the tried and true back to back SCR technique. It’s and old unit but still in service, partly due to our repairs and system debug. About half the gear in the photo is our test jig. Watch out for ‘flux doubling’ when you turn on/off that big toroid transformer! We kept blowing the 20A breaker until we set up the variac on our bench set up.
high voltage testing of 208VAC phase controller used on semiconductor production equipment
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