flyrotary@lancaironline.net Mailing List Archive

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/