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induction brazing heaters

induction brazing heaters

induction brazing heaters

(OP)
I am a little out of my realm. We are working on a late 70's induction brazing unit 40KW which has been blowing fuses. I have dealt with the primarily mechanical side and wish to move to the theory of operations. I have read through what literature I can find but am still left with questions.

The conditions are:
voltage limit light
power limit light

voltage at 110-120%
frequency %70

We are using a U channel coil on flat plate brazing material.

We have two comparable units. Both use the same power unit. Apparently one unit has had the work station inverter changed to a Tacco unit. Is there a way to compare the 2 work station inverters to compare them? Is there a means to match the 2 transformers.

The 2nd unit runs at 60% freq
voltage limit light on @ 115%

The unit has not been tuned for our material from 3/4" to 1" rectangular shaped and curved plate in over a year.

What percentage change should be seen when I move to different taps. Tap 1-13 is 12:2 ratio and 5-15 yields 10:2. Does this mean I should see a 6:1 and 5:1 voltage increase?

From what I have read as frequency increases we should see less power output and less depth penetration. I wish to move both units to the same ~frequency in the 6200-6300 Hz. How do we determine the ideal frequency for heating of a particular material? Some of the staff feel the gauges are not accurate since they are analog.

By using 2*pi*f = 1/sq rt (L*C) i show and increase from 26 to 30 micro farads capacitance should yield an approximate 6000 hz frequency. I am concerned with increased probability of blown fuses from the increased capacitance.

From the literature with both volt and power lights illuminated says I should lower the capacitance which will increase my frequency leading to lower penetration and power output. I am deducing from the paperwork I should lower to the next lower tap and increase capacitance to get the volts, power and frequency I require.

Thanks

Rich





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