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Re: 2 questions: SRSG & LTR Caps
Original poster: "Dave Leddon by way of Terry Fritz <twftesla-at-qwest-dot-net>" <leddon1-at-llnl.gov>
I think you need a larger cap. My SRSG is similar to yours:
>1. Salient pole motor 1/5 HP 3600 RPM
>2. 7" 2-electrode disk
>3. 10A 120 V Variac
>4. 50uf -at-330V Cap
>5. 51K-ohm resister across cap
>6. 5A fuse
With this setup I get 85 degrees of phase shift using about 85% of the
rotation of the
Variac control with a resonate voltage rise of 4 volts.
At 09:58 PM 3/18/02, you wrote:
>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
>Tried firing up a SRSG with phase control tonight with dismal results. I
>suspect the components are of incompatible size. No significant change in
>phase(<5deg), even using modified strobe (per Terry) to check visually.
>1. Salient pole motor 1/7 HP 3600 RPM
>2. 6" 2-electrode disk
>3. 3.5A 120 V Variac
>4. 15uf -at-660V Cap
>5. 47K-ohm resister across cap
>6. 5A fuse
>While I have lots of caps and resistors, but don't have a feel for
>order of magnitude of change needed. Anyone with experience please advise.
>For LTR Caps with 15 kV NSTs is the rule of thumb of 0.5nF per mA fairly
>for 30-300 mA? i.e. 15nF -at-30 mA, 30 nF -at- 60 mA, etc.