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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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switcher dummy loads
I am working on a switching power supply from an older Avid hard disk
array. The array itself has proprietary Ultra SCSI drives in it. No documentation is available. The power supply seems to have issues and blew the fuse. nothing seems to be shorted and no caps are bulging. As far as i can tell, the PS is about 12volts at 15 amps and 5 volts at 12 amps or so. I was thinking of hot wiring the supply outside of the unit and thought best to load down the rails some. So, what would be an acceptable dummy load(s) for a supply of that ratings? would a couple of amps per rail load sufficient to start up and maintain regulation? I am going to solder it up, i i have found no smoking guns so far. bob |
#2
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switcher dummy loads
bob urz wrote:
I am working on a switching power supply from an older Avid hard disk array. The array itself has proprietary Ultra SCSI drives in it. No documentation is available. The power supply seems to have issues and blew the fuse. nothing seems to be shorted and no caps are bulging. As far as i can tell, the PS is about 12volts at 15 amps and 5 volts at 12 amps or so. I was thinking of hot wiring the supply outside of the unit and thought best to load down the rails some. So, what would be an acceptable dummy load(s) for a supply of that ratings? would a couple of amps per rail load sufficient to start up and maintain regulation? I am going to solder it up, i i have found no smoking guns so far. bob Load with two car breaklights. Or with one,with the double filament, the heaviest to 12v, the other to 5v. |
#3
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switcher dummy loads
On Thu, 01 Apr 2010 21:36:28 -0500, bob urz put
finger to keyboard and composed: I am working on a switching power supply from an older Avid hard disk array. The array itself has proprietary Ultra SCSI drives in it. No documentation is available. The power supply seems to have issues and blew the fuse. nothing seems to be shorted and no caps are bulging. As far as i can tell, the PS is about 12volts at 15 amps and 5 volts at 12 amps or so. I was thinking of hot wiring the supply outside of the unit and thought best to load down the rails some. So, what would be an acceptable dummy load(s) for a supply of that ratings? would a couple of amps per rail load sufficient to start up and maintain regulation? I am going to solder it up, i i have found no smoking guns so far. bob FWIW, I have a minicomputer PSU that delivers 150A @ 5V. Whenever a chassis was unloaded, the PSU was loaded with a fan cooled, 1 ohm, 50W aluminium clad resistor. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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