10-19-2007, 03:59 PM
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#1 | | Member
Join Date: May 2007
Posts: 54
| replacement of power supply for scoring machine
My fencing class is using the following scoring machine:
Favero electronic design FULL-ARM-01/T
RECORDING MACHINE FOR FENCING
The original power supply is not worked. (input 220V, output 12V 500ma)
I replace a new power supply (input 220V, output 12V, 1000ma)
I would like to ask two questions:
1. Will new power supply may break the scoring machine?
2. As the power output is larger as 1000ma=1A, will this harm the fencer? | 
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10-19-2007, 07:06 PM
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#2 | | Senior Member
Join Date: Nov 2003
Posts: 960
| Quote:
Originally Posted by vicepang  My fencing class is using the following scoring machine:
Favero electronic design FULL-ARM-01/T
RECORDING MACHINE FOR FENCING
The original power supply is not worked. (input 220V, output 12V 500ma)
I replace a new power supply (input 220V, output 12V, 1000ma)
I would like to ask two questions:
1. Will new power supply may break the scoring machine?
2. As the power output is larger as 1000ma=1A, will this harm the fencer? | No problem. More current capacity (amps) is fine. It would be a problem if the voltage was different, but not the current capacity.
It will not affect either the machine nor the fencers. | |
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10-19-2007, 09:52 PM
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#3 | | Senior Member
Join Date: Apr 2005 Location: RPI (Troy, NY)
Posts: 924
| Quote:
Originally Posted by brtech No problem. More current capacity (amps) is fine. It would be a problem if the voltage was different, but not the current capacity.
It will not affect either the machine nor the fencers. | So long as it's more current, not less.
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10-20-2007, 02:21 AM
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#4 | | Just Joined
Join Date: May 2007 Location: Australia
Posts: 3
| If its an unregulated power supply you're replacing it with, then you may get higher than rated voltage, because the PSU is under loaded. However Unregulated PSUs are are uncommon now, so if you bought it recently you should be fine. | |
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10-24-2007, 01:04 PM
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#5 | | Senior Member
Join Date: Jun 2006 Location: Hollywood, CA
Posts: 149
| It only draws what it needs, so that 1000ma will probably last longer.
If it ever happens again, you can go over just not under. It would probably burn out a 250ma, for example. | |
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10-24-2007, 01:20 PM
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#6 | | Senior Member
Join Date: May 2007 Location: SF bay area (ca-USA)
Posts: 343
| Even better find a medical grade supply-designed for circuits that connect to people. Less chance for a catastrophic failure. http://www.reliancepowersupply.com/m..._wallmount.htm
__________________ entia non sunt multiplicanda praeter necessitatem "a braggart, a rogue, a villaine that fights by the book of arithmatick. Why the dev'l came you betweene us?.." | |
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10-24-2007, 06:33 PM
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#7 | | Senior Member
Join Date: Dec 2005 Location: the Salle(I no longer have a home address)
Posts: 1,113
| Quote:
Originally Posted by the ancient one Even better find a medical grade supply-designed for circuits that connect to people. Less chance for a catastrophic failure. | Actually, old computer power supplies are cheaper, regulated, and have more than enough capacity to drive every scoring machine in a normal salle. Quite often you will find them as they are being thrown away. Main concern is whether such a power supply is AT or ATX. The ATX variety require that one line "purple I believe" is grounded before they will turn on.
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10-24-2007, 10:58 PM
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#8 | | Senior Member
Join Date: Oct 2005
Posts: 108
| It?
Quote:
Originally Posted by Hollywood Troy It only draws what it needs, so that 1000ma will probably last longer.
If it ever happens again, you can go over just not under. It would probably burn out a 250ma, for example. | What would probably burn out? The power supply or the scoring machine? | |
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10-24-2007, 11:10 PM
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#9 | | Senior Member
Join Date: Nov 2003
Posts: 960
| The power supply. It's not a great idea to do that to a scoring machine, but it's unlikely to die. What would kill the machine is too high voltage.
Using an ATX supply is problematic. You need a minimum current draw on one of the outputs. I'm not sure which one, but the minimum draw is pretty substantial; much higher than a scoring machine. If you have a whole bunch of them, it might work, if you are powering from the output the power supply regulates from.
If you know what you are doing, the right value/power resistor can fix this. However, if you don't know what you are doing, you could get the voltage too high, because the supply doesn't regulate the way it's supposed to.
You can often find a single voltage supply that has high current which can run a number of machines, but again, you need to make sure you are pulling the minimum current needed to maintain the regulation of the voltage.
Wall wart type supplies usually don't have this problem, but the high current ones sometimes do. It's one reason NOT to go too far above the range you expect to need. | |
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