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Vision Microsystems - oil pressure problem

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n616tb(at)btsapps.com
Guest

Posted: Sat Sep 23, 2006 4:12 pm Post subject: Vision Microsystems - oil pressure problem

Hi Listers,  

   

I have a Vision Microsystems VM-1000 installed in my RV-6.  I have no oil pressure reading as it just flashes 0’s.  I pulled the connector and checked the pins and location but don’t see a problem.  The sender is mounted on the firewall with an aero quip hose up to it.  VM is apparently NOT available for calls or support.  Any ideas on what I can check?  Thanks  

Tim  

RV -6  

        [quote][b]

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rv8(at)lazy8.net
Guest

Posted: Sun Sep 24, 2006 6:18 am Post subject: Vision Microsystems - oil pressure problem

If you keep after them, and leave phone messages, they will answer you eventually. They are in the midst of a move from Oregon to Texas.

 

 Meanwhile, check to see if you have 5 volts from the red wire to the black wire at the transducer. 

 

 If you get desperate, I can send you an old transducer that works, it just reads wrong, and you can check your wires with it.

 

 John

 

 

 

 Tim Bryan wrote: [quote]                 <![endif]-->       <![endif]-->      

    

Hi Listers,   

    

I have a Vision Microsystems VM-1000 installed in my RV-6.  I have no oil pressure reading as it just flashes 0’s.  I pulled the connector and checked the pins and location but don’t see a problem.  The sender is mounted on the firewall with an aero quip hose up to it.  VM is apparently NOT available for calls or support.  Any ideas on what I can check?  Thanks   

Tim   

RV -6   

    	  Quote: 	
		  

	
 [b]

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Vanremog(at)aol.com
Guest

Posted: Sun Sep 24, 2006 6:40 pm Post subject: Vision Microsystems - oil pressure problem

In a message dated 9/24/2006 1:34:59 P.M. Pacific Daylight Time,  chasb(at)satx.rr.com writes:

  	  Quote: 	
		  If you    have the VM-1000 Installation/User Manual, Section 5 is a  

Trouble    Shooting Guide. Page 88 give specific readings to check out  

the oil    pressure indicating system.  If you don't have the manual,     

contact me back channel and I'll send you a copy of the appropriate     

page.

	


 

 ========================================

  

 My experience may give you pause to consider what can happen in an  intermittent piece of cable.  This it the only explanation I was able to  come up with my fuel pressure (carbureted) sender indications from day one until  I changed the cable (remade it with all new materials).

  

 From the first flights until about 6 months ago I had variations in my  pressure indications that ran the gamut from zero to 9 psi at various times and  then would settle down for months only to recur at odd times.  I discussed  with VMI and they told me that there is no way the sender or the conditioning  and/or display driver circuits in the DPU could behave this way.  Before my  last trip to Sedona I finally gave up, rebuilt it and spent an hour on my back  under the panel stripping out the old one and reconnecting the new  one.

  

 It has been working well ever since.

  

 What I believe happens is that the cable VMI buys is the  wonderfully high quality (he said facetiously) stuff that comes from  overseas.  It is constructed of individual primaries that get shielded and  jacketed as a grouping.  I suspect that when the cable making  machine senses that one of the individual wires has reached the end of the  spool, it stops and notifies the operator to manually load a new spool.   The operator (making the equivalent of 5 cents a day) strips back some  insulation on the free ends and twists them together.  He hits go and the  machine continues making more high quality cable and no one is the wiser.

  

 The shipping guy tests the spool (if they test at all) and there  is continuity on all wires.  We're good to go off to the USA and fly  in the instrumentation circuit of an aircraft.

  

 Imagine an only slightly less motivated operator that doesn't strip  the wires and a manufacturer that laid off the test function to cut costs.   Good wire and cable is worth the money.

  

  

  

 GV (RV-6A  N1GV O-360-A1A, C/S, Flying 809hrs, Silicon Valley, CA)  

  [quote][b]

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