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GRT EIS Question

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MJKTuck(at)cs.com
Guest

Posted: Wed Mar 19, 2008 6:50 pm Post subject: GRT EIS Question

Hi Folks,



I finally flew with my newly installed Grand Rapids Model 2000 EIS.



All in all I like it - certainly a lot more info to interpret than I had 

before (with needle position would show if anything was out of normal). 

I am sure I will get used to it.



A few questions for those who have installed one also.



On initial power up the red light flashes and the oil pressure flashes 

(not surprising as the engine is not yet started).



Selection of 'Ack' acknowleges the red light which remians on. Engine 

starts up - but the red light stays on throughout the flight with no 

further warnings or indication what might be the problem. Any ideas why 

it is staying on?



I need to put in a VDO fuel pressure sensor as the system won't work 

with my Mitchell one so the fuel pressure is wired but just reading 

zero. Both Aux1 upper and lower limits are zero so I don't that is what 

is causing the red light problem. I do not have a manifold pressure 

sensor so have not wired that.



CHT2 (right rear cylinder) reads 60 deg F (ambient today) but never gets 

above 80 deg F even though CHT1 (front left cylinder) seems to be 

reading normally at around 175 deg F (from memory). Both EGT's are 

behaving as expected. I will have to check my crimps as I suspect a 

dodgy connection for that one.



Any clues or things to check out would be appreciated.



Regards,

Martin Tuck

Europa N152MT

Wichita, Kansas

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h&jeuropa

Joined: 07 Nov 2006
Posts: 649

Posted: Thu Mar 20, 2008 6:55 am Post subject: Re: GRT EIS Question

Hi Martin,



Since pressing ACK for oil pressure makes the light stop flashing, that is what is generating the alarm.  The light is staying on because the oil pressure is still out of limits.  This is explained on Figure 1b of the EIS  manual.  Check that your oil pressure is between the lower and upper limits you have set.



If fuel pressure (Aux input) were causing an alarm, you would have to press Ack to extinguish that alarm.  And setting limits to 0 causes EIS to ignore that input from an alarm point of view (see page 7 of EIS Manual). 



My bet is that you either have low oil pressure limit set higher than what your oil pressure is indicating or high oil pressure is set lower than what your oil pressure is indicating.  Is your oil pressure indicating what you expect?  Are you using GRT or Rotax oil pressure sending unit?  Not sure what a Mitchell sending unit is but EIS probably isn't calibrated for Mitchell's.



For fuel pressure, the easiest solution is to purchase the sensor from GRT.  It will come with the SF and Offset information.  You could calibrate the existing Mitchell sensor if you have or can obtain the resistance vs pressure data.



Jim Butcher

N241BW

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MJKTuck(at)cs.com
Guest

Posted: Thu Mar 20, 2008 8:23 am Post subject: GRT EIS Question

Hi Jim,



Thanks for the thoughts. The initial trigger for the warning light is low oil pressure but once the engine starts the oil pressure is where it should be and within the upper and lower limits that are set - in fact the unit came with the upper and lower units already set for a Rotax but I double checked anyway.



In fact once the engine is started and warmed up all the parameters are within limits (except that pesky CHT2 which stays at around 60-80 deg F - but there is no 'Low CHT Temp' parameter so should not be causing a warning) but the warning light stays on and I can't figure out why.



Martin

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rehn(at)rockisland.com
Guest

Posted: Thu Mar 20, 2008 9:21 am Post subject: GRT EIS Question

Martin



I've had this system for some time and like it very much. If you have an out

of limits issue the warning light blinks and continues until it is no longer

out of limits and then the light goes out or if you "acknowledge" the issue

the light burns steady ( I suppose so it is not quite as annoying) until it

is fixed. If the oil pressure is the offending limit I would go back into

the settings and reset your upper and lower limits yourself. In any case

what ever is coming up on your EIS as the problem I would go to that and

readjust and reset the EIS. Hopefully that will work if not I would call and

speak to their tech. people who have always been helpful. Good luck.

Jerry 



--

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jeff(at)rmmm.net
Guest

Posted: Thu Mar 20, 2008 9:33 am Post subject: GRT EIS Question

Martin,

Perhaps you have a CHT span warning as I did with my stratomaster 

monitor. I have made inserts to the front round openings that shoot the 

air up over the cylinders and now have fairly even cooling within 15 

degrees. Still a bit high but I'm working on that. I'm considering a 

ram inlet on the top of the cowl of some sorts.

Regards,



Jeff R.

A258 - N128LJ / Gold Rush 108 hours and climbing slowly.

On Mar 20, 2008, at 10:16 AM, MJKTuck(at)cs.com wrote:



 	  Quote: 	
		   



 Hi Jim,



 Thanks for the thoughts. The initial trigger for the warning light is 

 low oil pressure but once the engine starts the oil pressure is where 

 it should be and within the upper and lower limits that are set - in 

 fact the unit came with the upper and lower units already set for a 

 Rotax but I double checked anyway.



 In fact once the engine is started and warmed up all the parameters 

 are within limits (except that pesky CHT2 which stays at around 60-80 

 deg F - but there is no 'Low CHT Temp' parameter so should not be 

 causing a warning) but the warning light stays on and I can't figure 

 out why.



 Martin

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h&jeuropa

Joined: 07 Nov 2006
Posts: 649

Posted: Thu Mar 20, 2008 11:16 am Post subject: Re: GRT EIS Question

Martin,



When you power up EIS, the red light comes on flashing, correct?  



And when it does, the page showing  has Oil Press on it and that value is blinking, correct?



And when you push ACK, the light quits blinking but stays on steady and the default display page (usually fuel qty & flow display page 0) comes up, correct?



Then you start up and the light stays on, not blinking, correct?



If all these are true, the problem is in the oil press low/high limits or the pressure measurement.  Be aware there are two low oil press settings - one is Min OilP and the other is Min Crz_OP.  Have a look at page 9 of the EIS manual.  Min OilP is set at 22 and Max OilP is set at 98 for my 914.  Note that Max OilP must be set less than 99 - if it's set over 100 that may be your problem.



Jim Butcher

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