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From: "Bill Schertz" <wschertz@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2757158@logan.com>
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Subject: Re: [FlyRotary] Re: EM2 Warning light
Date: Mon, 25 Feb 2008 20:47:16 -0600
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I understand Bob, but:

I had a 12V LED with 12V supply, and the wire from the EM-2 connected to the 
other terminal. I noticed that the LED glowed slightly all the time (very 
dim, but noticeable). I called and talked to Tracy, and he said to take a 5V 
lead out of the EM-2 and use a LED set up for 5V, that the 12V would 
overpower the circuit (my words not his) and allow a small current to flow 
through the LED, causing the dim glow. It was almost a year ago, but I 
believe that he said that if you use a filament bulb, it doesn't matter, but 
with the LED to use the 5V supply.
Bill Schertz
KIS Cruiser #4045
N343BS (reserved)
----- Original Message ----- 
From: "Bob White" <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 25, 2008 2:48 PM
Subject: [FlyRotary] Re: EM2 Warning light


> Hi Bill,
>
> My manual says to connect the + side to 12V unless the lamp requires a
> different voltage.  The output pulls the indicator light to ground, so
> it shouldn't matter if it's hooked to +12 or +5.
>
> If using an LED, a series resistor is required to limit the current.
> The LED's that are rated at 12V have a built in resistor so an external
> one isn't needed.  A typical LED will have a maximum current rating of
> around 30 ma and that may be too bright especially at night.
>
> Something like a 600 ohm resistor would limit the current to between 15
> and 20 ma.  There is approximately 2 volt drop across the diode and the
> bus voltage varies by several volts so the actual current will vary
> also.  A smaller or larger resistor can be used to adjust the
> brightness.  (Check the specs for the LED you use of course.)
>
> Bob W.
>
> On Mon, 25 Feb 2008 20:05:49 +0000
> wschertz@comcast.net wrote:
>
>> Check the manual -- I believe that the warning light should be connected 
>> to a 5 volt source. At least if using LED's. An LED will glow all the 
>> time if fed with 12V, but if it is incandescent, it won't light up. The 
>> EM-2 connects to ground when alarming
>> Bill Schertz
>>  -------------- Original message ----------------------
>> From: Bob White <bob@bob-white.com>
>> > Hi Bob,
>> >
>> > It sounds like a wiring problem.  The warning light should be connected
>> > to the 12V bus on one side, and the other side is connected to the wire
>> > from the EM2. If it's an LED, then polarity of the LED is important 
>> > too.
>> >
>> > When a reading is out of spec on the EM2, the reading also flashes.
>> > That continues even when the ACK button is pushed.  Are you seeing any
>> > of the readings flash off and on on the EM2 display?
>> >
>> > Bob W.
>> >
>> > On Mon, 25 Feb 2008 10:13:49 -0500
>> > bmears9413@aol.com wrote:
>> >
>> > > I dont have a warnig light hooked directly to the alternator. I 
>> > > understand
>> > that if any display on my EM2 is out of "spec"..the display will flash 
>> > and the
>> > warning light from the EM2 will light up untill you press the ACK 
>> > button. My
>> > warning light never lights up...for any reason so far.
>> > >
>> > > Bob Mears
>> > >
>> > >
>> > > -----Original Message-----
>> > > From: Bob White <bob@bob-white.com>
>> > > To: Rotary motors in aircraft <flyrotary@lancaironline.net>
>> > > Sent: Sun, 24 Feb 2008 11:02 pm
>> > > Subject: [FlyRotary] Re: EM2 Warning light
>> > >
>> > >
>> > >
>> > > Hi Bob,
>> > >
>> > > Warning light connected to the alternator?  It should come on when 
>> > > you
>> > > power up and go out when the alternator starts putting out.  If it's 
>> > > the
>> > > warning light from the EM2, it should start flashing when anything 
>> > > goes
>> > > out of it's range, and that's practically all the time when you're 
>> > > fist
>> > > setting it up.  If It's not coming on at all it sounds like something
>> > > isn't hooked up right.
>> > >
>> > > On your water pressure, it should come up to cap pressure at the 
>> > > most.
>> > > Do you have an air cushion in your system.  If not, the pressure will
>> > > go pretty high because of liquid expansion until a little liquid is
>> > > pushed into the overflow tank.  23 psi isn't going to hurt the 
>> > > engine,
>> > > but the EM2 calibration needs to be checked also.  I was able to rent 
>> > > a
>> > > cooling system pressure tester from AutoZone which helped with the
>> > > calibration.
>> > >
>> > > Bob W.
>> > >
>> > >
>> > > On Sun, 24 Feb 2008 23:46:39 EST
>> > > BMears9413@aol.com wrote:
>> > >
>> > > > Is there a test mode on the EM2 warning lamp? My alternator is only 
>> > > > putting
>> > > > out 12.6 volts and my EM2 has the voltage flashing, as it should. 
>> > > > But my
>> > > > warning  light doesn't light up. Shouldn't it? It hasnt lit up yet, 
>> > > > even
>> > with
>> > > the
>> > > > engine  not started and 0 oil pressure.
>> > > >
>> > > > Bob Mears
>> > > > Supermarine Spitfire.
>> > > >
>> > > >
>> > > >
>> > > >
>> > > > **************Ideas to please picky eaters. Watch video on AOL 
>> > > > Living.
>> > > >
>> > (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/
>> > > > 2050827?NCID=aolcmp00300000002598)
>> > > >
>> > >
>> > >
>> >
>> >
>> > -- 
>> > N93BD - Rotary Powered BD-4 - http://www.bob-white.com
>> > 3.8 Hours Total Time and holding
>> > Cables for your rotary installation - http://roblinstores.com/cables/
>> >
>> > --
>> > Homepage:  http://www.flyrotary.com/
>> > Archive and UnSub: 
>> > http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>
>>
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub: 
>> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
> -- 
> N93BD - Rotary Powered BD-4 - http://www.bob-white.com
> 3.8 Hours Total Time and holding
> Cables for your rotary installation - http://roblinstores.com/cables/
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub: 
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>