Electrical details
Okay, so the CP250TS's specs indicate:
33A at 208v, or 30A at 230v. We can estimate roughly 29A at 240v... and that'll be close enough. Total load is around 11.4kw.
Looking at the jumper and wiring diagram for the main transformer primary, it's obvious we'll be using the 230v wiring taps. The transformer wiring scheme at that voltage is delta, which (as noted from the SRH-333 project) works out great.
Here's the capacitance formula.
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I = 2 * π * F * C * V
where:
Current (I) is in Amperes,
Pi (π) is 3.14,
Frequency (F) is 60,
Capacitance (C) in Farads (NOT microfarads)
Potential (V) is in Volts.
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Solve for C, and here's what we got on the CP-200:
C = (18.6 / 3) / 2 * π * 60 * 240
C = 6.2 / 90477.87 F
C = 68.53 µF
Now, The CP250's input is 11kw... You'd think that if I were to take the time to do intense math, we'd find that the capacitance value required to yield similar phase-shift, would be slightly greater than the CP200's CALCULATED 68.53 UF/side. In reality, it worked wonderfully at 60uf, BUT...
The CP-200's transformer was originally wired in Y, so the individual coil voltages were substantially different (277 across each, when wired for 480v supply). Can't use the CP-200's value as the 'seed' here, 'cause the applied coil voltage is totally different.
The SRH-333, however, was delta, practically identical to the 250TS, we'll just try whatever Surplus Center has that'll mechanically fit well and be in a similar range.I used 200uf caps for the SRH, so betting that 140-160uf @ 300+v ought'a do it. Looks like the big square 120's are all gone, so I'll hafta either use a group of other form factor/size units, or go a-hunting for more options. Of course, selecting a different package means knowing what I have for available space inside the unit... since I haven't opened it up yet, I don't know, so....Stay tuned!