What's Going On?

Equipment discussion, and any tech stuff post here

Moderators: stan, Chris S, Zoltan

crinklystarfish
Gold
Posts: 1185
Joined: Mon Jan 30, 2012 9:34 am
Contact:

What's Going On?

Postby crinklystarfish » Wed Jun 28, 2017 4:31 pm

Been thinking and faffing for a couple of days: here's the result.

Anyone like to take a punt at what's going on?
You do not have the required permissions to view the files attached to this post.

Ivan C
Gold
Posts: 373
Joined: Mon Oct 17, 2016 5:38 am

Re: What's Going On?

Postby Ivan C » Wed Jun 28, 2017 5:23 pm

Looks like a relay you'd like to be able to keep closed when the supply to the coil is interrupted, or to be able to operate the relay without needing a supply to the coil. Same thing I suppose!
I can't speculate on application :D
Ivan C

User avatar
julianf
Gold
Posts: 58
Joined: Sun Sep 25, 2016 5:41 pm
Location: Devon, UK

Re: What's Going On?

Postby julianf » Wed Jun 28, 2017 6:33 pm

If you keep the strip closer to the electromagnet, then, i guess, you would be able to close the contact with a weaker magnetic force (ie less voltage)?

crinklystarfish
Gold
Posts: 1185
Joined: Mon Jan 30, 2012 9:34 am
Contact:

Re: What's Going On?

Postby crinklystarfish » Thu Jun 29, 2017 6:39 am

Too easy eh?

It is indeed all about power conservation. The two relays are master switches for my 24 and 12V systems and when we are travelling are - through necessity - permanently on. I did some testing and found they draw approx 165mA each when in use. This might seem inconsequential but when extrapolated can be an eye-opener - it was for me, anyway.

We normally travel each day when out and about but usually 'camp' from somewhere late afternoon to mid morning the following day, usually a period of around 17hrs. In that time it's costing us almost 6A just to hold the relays in. Now, because we travel each day we've never really succumbed to huge battery capacity or auxiliary charging solutions so our 24V battery capacity is embarrassingly tiny. As such, 6A is about 5A more than I'd like to be losing for no good reason. I'd much rather that 6A be available for the compressor fridge .

Even worse, though I never intended our truck to be used for shows, I have been to a few and parking up late Thursday to Sunday afternoon would see the relays suck 24A. Ouch.

And so, I've tweaked them to enable manual override. With the knurled screws 'out' the relays still operate just as Durite intended. Once the relays are switched on though, I can now tighten the knurled screws in and lock the contacts closed. When that's done, turning the relays off saves all the power previously required just to activate the coils. from now on I'll 'lock' them when setting off on a break and 'unlock' them on our return.

It seems like a decent work-around and though it's a bit of a bodge it's saved me from having to disturb my original wiring looms. Lesson learned: if I built again, I'd utilise something like these instead. You know where you are with a big-ole manual switch.

User avatar
Brian-reynolds
Gold
Posts: 1498
Joined: Thu May 03, 2012 8:05 pm
Location: Sheffield
Contact:

Re: What's Going On?

Postby Brian-reynolds » Thu Jun 29, 2017 8:49 am

Clever idea that Steve, I have 2 relays for isolating either the 12 or 24v systems and so far I have only isolated one of the circuit once in all the time I have had them installed....

Would just a battery isolator switch do the trick, the likes of this?
http://www.vehicle-wiring-products.eu/p ... 10mm-studs

Or does it have to be more sophisticated? I never will understand all the intricacies of electrical systems.... it all seemed so easy before I started.....

B.

crinklystarfish
Gold
Posts: 1185
Joined: Mon Jan 30, 2012 9:34 am
Contact:

Re: What's Going On?

Postby crinklystarfish » Thu Jun 29, 2017 9:29 am

That'd do just fine Brian. It 's a make / break relay without any of the faff or energy requirements.

Part of the reason I used relays initially was to allow an auto-switch function in the 12V system's supply between 12V battery and my 24-12V DC-DC converter.

In all the time we've used the truck I've never had to do this so conclude the automation was a waste of time (and battery power). I can still select which 12DC source to use but now it's a manual operation only.

The DC-DC converter is only a contingency backup supply in case of component failure so hopefully I'll never have to use it at all.

Latching relays are another option but their current carrying capacity is generally quite low and they rely on electronic components...

User avatar
Brian-reynolds
Gold
Posts: 1498
Joined: Thu May 03, 2012 8:05 pm
Location: Sheffield
Contact:

Re: What's Going On?

Postby Brian-reynolds » Thu Jun 29, 2017 9:43 am

crinklystarfish wrote:and they rely on electronic components...


I hope you never need a heart "pace maker" or you will have a heart attack just worrying about it!

Is it any wonder why I want to live in an old water mill.......

B.

User avatar
christyler
Gold
Posts: 232
Joined: Sat Nov 02, 2013 8:34 pm
Location: Cork, Ireland
Contact:

Re: What's Going On?

Postby christyler » Fri Jun 30, 2017 11:18 am

Good solution to the problem steve.
the only problem for me would be the manual intervention needed, firstly i am a lazy sod and secondly i would forget !!!

i am using solid state relay's on everything like that, the truck systems still have standard relay, actually i just replaced them all for durite ones, it had those horrid aluminum cased things in it.

crinklystarfish
Gold
Posts: 1185
Joined: Mon Jan 30, 2012 9:34 am
Contact:

Re: What's Going On?

Postby crinklystarfish » Fri Jun 30, 2017 2:28 pm

The big difference is mate, you know what you're doing... :lol:


Return to “Equipment & tech”

Who is online

Users browsing this forum: No registered users and 1 guest