On 2008-10-06, Up North wrote:

"Ignoramus14503" wrote in message
...
On 2008-10-06, Karl Townsend wrote:
I will list them, and I know that you mentioned quite a few.

1. Being able to use what you have
2. Lower startup current
3. Ability to add extra capacitors at the same time as switching in
the other motor, for perfectly balanced third phase

My phase converter is one of relatively few homemade things that I am
actually very happy with and that does not give me any trouble.

I also have a dual motor unit. 10 and 15 in my case. I'll just emphasize
that you need to delay the starting of motor 2 by several seconds.
Spreads
start load.


That's what I do also. I have a starting switch and a button. I flip
the switch, which starts the first motor. At this point there is no
power on the output of phase converter, and the first motor is noisy,
because it is unbalanced electrically.

When I hear that it started, I push a button. That closes the
contactor that starts the second motor, and also connects balancing
caps for the other leg, and enables output.

At that point the RPC is running and producing balanced 3 phase power,
and quiet.

I have a phase convertor that runs my downdraft grinding table. The Phase
convertor is a 7.5hp the table is 3hp. On occasion I shut the phase
convertor off without shutting the table off. I also once in a while, start
the phase convertor with the switch on the grinding table on. Does this
practice hurt anything?

Could hurt the person who is changing the saw blade at the moment.

Otherwise, if that stuff starts quickly, I do not think so.

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