Couple of questions on RPC build

Barncat

H-M Supporter - Gold Member
H-M Supporter Gold Member
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May 14, 2018
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I am going to be building my first RPC soon, and I have a stupid question. I have a 3 pole fuse block for power to go through on the way out to the machines. If the equipment motor is ten amps, do I use 3 ten amps fuses, or does the ten amps get divided between the 3 lines?

Also, I bought a lot of used electrical boxes at auction, and one of them had some volt meters on it. Would there be any benefit to wiring these in to see real time volt readings while the equipment is in use?IMG_20181102_185809705.jpg
 
If the equipment is 10 amp, I would use fuses that match the wire sizes. #12 wire = 20 amps, #10 wire = 30 amps on each leg. The fuses are really to protect the wiring, not the equipment. The motor should be protected by a thermal overload after the contactor.

The voltmeters really add to the ''cool factor'' of the RPC, and are helpful for adjusting the balance. Go for it.
 
I am not actually sure on the amperage of the equipment motors, I haven't gotten that far into it yet. But I understand what you are saying and that helps. Thanks
 
Looks like two of those meters are missing front covers- you wouldn't be able to set the zero on those two
mark
 
Looks like two of those meters are missing front covers- you wouldn't be able to set the zero on those two
mark


I'm going to have to disagree with you here. :) The little yoke hanging below the movement bearing support bar is what adjusts the zero. That yoke normally engages with an eccentric pin on the meter cover adjusting screw. But it is held in place by friction at the support bar. So by just moving the yoke with a small screwdriver it is possible to adjust the zero without the meter cover in place.
 
Ah yes you're right Jim; I guess the real problem would be metal chips getting into the movements
M
 
Ah yes you're right Jim; I guess the real problem would be metal chips getting into the movements
M
Hopefully I will have this far enough away from any chips, but haven't finalized location yet.
 
Hi Guys,

Spring the cover off the bottom one, adjust them all for zero and make a Plexiglas cover that fits over the top of them all.

One point on some meters the adjusting tab can be at mains voltage, so do not touch the adjuster with the power on !
 
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