lml@lancaironline.net Mailing List Archive

Good catch! I have fuses in both the "starter engaged" and "HPU On" indicator lights for the very same reasons.

What voltage and frequency do you plan to use on your gonad exciter in order to assure detection of the stall warning system alarm?

-------Original Message-------

From: Sky2high@aol.com

Date: 30/04/2012 6:00:20 PM

To: lml@lancaironline.net

Subject: [LML] Re: Contactors vs Solid State Relays

Fred,

Thanks, as I always wait to see who picks up the other possible failure. I did say '"indication" circuit' only since I wouldn't dare to presume to design such as we are all experimenters. For years I have been harping on the same problem with the 200/320/360/?? hydro pump power relay "indication" terminal that is fed from the pump motor power contactor and that circuit is "protected" by a 50 or 60 amp breaker whilst the wire to the panel indicator light might be a mere 22 gauge. See if that can carry 50 amps if it shorts (do not yell "FIRE!" in a crowded cockpit)..... The Legacy plans wisely call for a wee diode on each "I" to the "gear in transit" light to not only isolate each relay, but have it burn up before the fire starts elsewhere.

BTW, the "I" line from my pump is protected by an inline fuse (uh, 1 or 2 amps if I remember correctly) as is the "starter engaged" circuit.

I love this stuff.............

Grayhawk

PS I am considering wiring all of my "idiot" alerts (including "angle, angle, push") to a high voltage coil attached to my leg so it tingles. I am getting too used to red lights and female nagging...................... Don't worry, there will be proper breaker limits.

In a message dated 4/29/2012 12:19:02 P.M. Central Daylight Time, frederickmoreno@bigpond.com writes:

A most helpful idea is to have an "indication" circuit off the solenoid contacts to an indicator light on the panel. If the indicator light is on after starting, turn off the master switch and the engine........................

That is a valuable idea to let you know the starter is still engaged when you let go of the switch. However, since that wire that sends the signal is probably 22 Ga (5 amps) and the starter cables are capable of handling hundreds of amps, best to put a little blade fuse assembly in the small signal line so that if it were to short..... Think heat, smoke, and worse.

Fred