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Forums13
Topics7,385
Posts40,945
Members10,040
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Most Online3,137
Apr 9th, 2026
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Joined: Apr 2014
Posts: 4
stranger
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stranger
Joined: Apr 2014
Posts: 4 |
I am having an intermittent problem with the 312 drive. I get a 404 flt every 4 to 8 hrs. I have changed the DSP, ribbon cable in the controller and the input/output board in drive. I am at a loss. Any help out there?
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Joined: Mar 2010
Posts: 366
enthusiast
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enthusiast
Joined: Mar 2010
Posts: 366 |
Issues with the brushes, armature, main contactor. Check your entire loop circuit for grounds or trace grounds
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Joined: May 2011
Posts: 487
addict
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addict
Joined: May 2011
Posts: 487 |
I agree with E311. Make sure your brush rigging, insulators and armature is clear to ground. What kind of machine?
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Joined: Apr 2014
Posts: 4
stranger
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stranger
Joined: Apr 2014
Posts: 4 |
Thanks for the info. Found the problem. The PS1 power supply for the card rack was dropping the 5 vdc and the +/- 12 vdc to the card rack for about 5 to 10 seconds causing the reference error.
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Joined: Mar 2010
Posts: 366
enthusiast
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enthusiast
Joined: Mar 2010
Posts: 366 |
Wow, good find! Its amazing how those of us who cut our teeth on relay logic, now find that we have to worry about power supplies- they have bitten me in the hind quarters many times 
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Joined: Jan 2010
Posts: 671
addict
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addict
Joined: Jan 2010
Posts: 671 |
You can say that again 311. Any weird problem that is not obvious right off the bat I go to the power supply. Especially on 312 drives the power supply on the drive is a source of so many problems we keep a pretested spare on the jobs to rule that out first. And remember even if it reads good switch your meter over to AC and look for bleed thru. Just a little AC will drive you crazy.
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HW PM
by Chris, January 13
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