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The 7.0A you measured was the current flowing to the phase converter after
the split between the machine and the converter itself, so this is the
amount of current required to generate the third phase. When you measure
the three phase currents out, you will probably see the difference between
the 7A and the 4.2A idle. I am always surprised at how much power the
converter takes at idle.

I would be curious to see how much current is flowing into each of the 3
phase legs. I wonder if the generated phase current is much different

the other two.

Has anyone ever looked at the currents out of the phase converter with a
current probe and an o-scope? Do they maintain anywhere near a 120 degree
phasing between the three phases? Is the phasing dependant on load?
-----Original Message-----
From: Geoff Shepherd <geoff@...>
To: felder-woodworking@... <felder-woodworking@...>
Date: Sunday, February 20, 2000 10:23 PM
Subject: [felder-woodworking] 3-ph current draw results

Hi all,

Mainly out of curiosity, today I purchased a basic digital clamp-around

ammeter ($60 Sperry DSA-400) to check the current draw on my Kay

Phasemaster

and Felder machines.

The Phasmaster MA-1's original factory test results from two years ago

it should draw at idle 4.6A at 242VAC. My measurements show about 4.2A at
245VAC. Although this meter doesn't have a peak hold function, start up
surge looked to be around 50A over several tests, but I don't know how
accurate it could be in measuring these very brief surges.

Since I only have only one twist-lock receptacle installed at the moment,

can only test each machine running by itself. Here are those results as
measured on the single-phase supply to the phase converter:

AF-22 LN 3kW/3ph (3m of 120mm hose connected to saw, 3m of 80mm hose
connected to shaper, and a used but freshly cleaned pleated poly drum
filter):
Starting peak: ~50A
Full power: 7.0A (8A with 120mm hose removed)

BF6-31 2.2kW/3ph (table saw mode w/12" stock blade):
Braking self-test: 4.9A
Starting peak: ~40A
Idling: 4.5A

Remember - these results are with both the subject machine and the phase
converter running. I'm not sure if I should just subtract out the phase
converter idle current to get real values, or if it is more complex than
that.

When I get the second twist-lock recptacle installed, I'll check the

3-phase

voltage balance under load and 1-phase current draw with both the BF6-31

and

the AF-22 LN running simultaneously.

The single-phase amp measurements were taken on each of the two hot legs
inside my 30A quick disconnect to the phase converter. Curiously, there

a consistent difference about about 0.2A between the two hot lines. I'm

sure what would cause that, but maybe it has to do with the snap-clamp
transformer being proximity sensitive to the metal cabinet, or just the
results of not buying a more expensive meter. In any case, I took the two
measurements and calculated an average.

If I did this incorrectly, please somebody let me know. I'm also not sure
how I should measure the current draw on the 3-phase side. Do I measure

leg, two legs, or all three and add/average the results? Not sure...

..Geoff



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