---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 07/28/10: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:39 AM - Re: Can I ground starter switch at panel? (Robert L. Nuckolls, III) 2. 07:44 AM - Re: E-Bus Off/On Indicator Light (gordonrsmith921@yahoo.com) 3. 08:00 AM - Re: Re: E-Bus Off/On Indicator Light (Robert L. Nuckolls, III) 4. 08:53 AM - Re: E-Bus Off/On Indicator Light (gordonrsmith921@yahoo.com) 5. 08:53 AM - intermittent intercom (Erich_Weaver@urscorp.com) 6. 09:44 AM - Re: intermittent intercom (David & Elaine Lamphere) 7. 01:45 PM - Re: Re: E-Bus Off/On Indicator Light (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 07:39:19 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Can I ground starter switch at panel? At 09:41 PM 7/27/2010, you wrote: > > >Would it be acceptable to feed 12V to the coil of my Rotax 914 >starter relay and only run 1 wire back to my panel mounted starter >switch (looking for ground)? > >I have power very close to starter relay, and ground very close to >starter switch. Sure. Engine cranking systems are intermittent use, short duration, almost never used in flight. As the most demanding system on the airplane with respect to power, it's also the most disruptive of the otherwise quiet and orderly world of battery powered systems. We don't generally expect everything on the airplane to operate unperturbed during a cranking event. We DO expect a graceful recovery to normal operations afterward. So as a general rule, the simplest recipe for wiring the starter system that functions as needed is the elegant solution. Bob . . . ________________________________ Message 2 _____________________________________ Time: 07:44:30 AM PST US Subject: AeroElectric-List: Re: E-Bus Off/On Indicator Light From: "gordonrsmith921@yahoo.com" Therefore I assume it is OK to tie the ground sides from the LED and the relay coil together through a single pole switch. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306554#306554 ________________________________ Message 3 _____________________________________ Time: 08:00:42 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: E-Bus Off/On Indicator Light At 09:43 AM 7/28/2010, you wrote: > > >Therefore I assume it is OK to tie the ground sides from the LED and >the relay coil together through a single pole switch. Sure . . . as long as multiple loads (coil and LED) that share ground through switch also share the same source of power. Bob . . . ________________________________ Message 4 _____________________________________ Time: 08:53:12 AM PST US Subject: AeroElectric-List: Re: E-Bus Off/On Indicator Light From: "gordonrsmith921@yahoo.com" So if the power source for the LED came directly from a tap on the e-bus itself as you suggested as an alternate, in that case a double pole switch would be required? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306565#306565 ________________________________ Message 5 _____________________________________ Time: 08:53:22 AM PST US Subject: AeroElectric-List: intermittent intercom From: Erich_Weaver@urscorp.com Feeling dumb about this question, but what the heck. My SL-40 radio is wired to a PS Engineering PM1000 II intercom. Everything initially wor ked well, but the intercom function is now intermittent from the pilots microphone side only. Transmit and reception are still fine. I cleane d the headphone plugs and corresponding socket contacts with no change. I have also made an initial inquiry with PS Engineering, who indicated th at the intercom circuit was dead simple and the unit itself was very unlik ely to be the problem. However, I have now realized that I often can temporarily fix the problem by turning the intercom power off, then bac k on once or twice. Doesnt that in itself indicate that the problem is inde ed internal to the intercom? Given those symptoms, is there really anythi ng else to check before sending the unit back to the manufacturer? thanks erich ________________________________ Message 6 _____________________________________ Time: 09:44:46 AM PST US From: "David & Elaine Lamphere" Subject: Re: AeroElectric-List: intermittent intercom Erich, I have that very same intercom installed in my Wittman Tailwind - connected to a KX125. While they (PS1000II) are a little more expensive than other brands, they are really good quality and work really well - even in a noisy cockpit. One thing I found out debugging my installation is the need to keep the jacks isolated from the aircraft's ground. It's really picky about that. You might verify those mike, headset sockets are not contacting ground (and any socket contacts that could be shorting out to each other or ground). Also check the aux mike and headset sockets (that you can use when the intercom is removed). Maybe you have an intermittent short to ground somewhere in your installation. I have to agree that it is doubtful the intercom unit is faulty - possible, but not likely. Hope you find the fix! Dave L. N365DL ----- Original Message ----- From: Erich_Weaver@urscorp.com To: aeroelectric-list@matronics.com Sent: Wednesday, July 28, 2010 11:52 AM Subject: AeroElectric-List: intermittent intercom Feeling dumb about this question, but what the heck. My SL-40 radio is wired to a PS Engineering PM1000 II intercom. Everything initially worked well, but the intercom function is now intermittent from the pilots microphone side only. Transmit and reception are still fine. I cleaned the headphone plugs and corresponding socket contacts with no change. I have also made an initial inquiry with PS Engineering, who indicated that the intercom circuit was dead simple and the unit itself was very unlikely to be the problem. However, I have now realized that I often can temporarily fix the problem by turning the intercom power off, then back on once or twice. Doesnt that in itself indicate that the problem is indeed internal to the intercom? Given those symptoms, is there really anything else to check before sending the unit back to the manufacturer? thanks erich ________________________________ Message 7 _____________________________________ Time: 01:45:40 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: E-Bus Off/On Indicator Light At 10:51 AM 7/28/2010, you wrote: > > >So if the power source for the LED came directly from a tap on the >e-bus itself as you suggested as an alternate, in that case a double >pole switch would be required? Not necessarily. But it does drive a requirement to evaluate unintended consequences (sneak path) for flow of current should one of the separate sources go to zero. What's the design goal for this light? 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