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06-05-2014, 07:32 AM | #1 (permalink) |
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Join Date: Nov 2012
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kosmik fuse
Just got my kosmik in today mounting up as we speak but stuck on how to mount fuse. If anybody could be kind enough to post up some pics so i can get a rough idea on how to mount this thing in my goblin comp it would be greatly appreciated.
I don't now if I feel comfortable just having it hang straight off with the cable just dangling. Has this worked for others just hanging straight off like that. Thanx in advance. |
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06-06-2014, 12:20 AM | #2 (permalink) |
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Join Date: Oct 2013
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I have mine mounted using a Fuse Holder, if you dont have it I would recommend it, because it holds it in place and does not feel like its flimsy.
http://www.helidirect.com/advanced_s...holder&x=0&y=0 |
06-06-2014, 04:20 AM | #3 (permalink) |
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Join Date: Aug 2011
Location: United Kingdom
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Due to space limitation on my Faifa and not being happy with how insecure it looks attaching it directly to the Kosmik tabs, I went with something totally different. It's an automotive audio fuse holder, that is fixed firmly to the frames and I can just unbolt the fuse if necessary.
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06-06-2014, 06:27 AM | #4 (permalink) |
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Join Date: Nov 2012
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Very nice I think I'll do that myself that seems pretty secured and it looks like it will hold up really good. Thanx wadder248
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06-08-2014, 10:58 PM | #5 (permalink) | |
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Join Date: May 2012
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Quote:
Could you post the manufacturer and part number, please? Perhaps a similar device is available here in the US. Thanks |
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06-09-2014, 06:08 AM | #6 (permalink) |
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Join Date: Aug 2011
Location: United Kingdom
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I used a midi sized holder, similar to this, obviously with the 200amp fuse.
When I added the terminals I crimped and soldered them to be certain they were never coming apart! For what is such an import safety measure, I'm amazed that Kontronik are happy to have it just bolted to the tabs.
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06-09-2014, 10:28 PM | #7 (permalink) | |
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Join Date: May 2012
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Quote:
Is there one that's rated at 200A? Thanks |
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06-10-2014, 04:30 AM | #8 (permalink) |
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Join Date: Aug 2011
Location: United Kingdom
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The title is confusing, as I thought the same! The title for all of these reads as if the holder is rated, but they're just quoting the supplied fuse.
That said though, I think most midi fuse holders are only rated up to 200 amps. I've been running this for a while now and the Kosmik logs often have peaks near 200 amps and there's no bad signs on the fuse holder.
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06-10-2014, 04:50 AM | #9 (permalink) |
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EEngineer, I have been looking into this also for a while. Those midi fuse holders take fuses from 50A or so up: 75A, 100A, 150A, and 200A. The fuses are all pretty much of the same dimensions.
One thing that I don't understand all that well is the voltage rating, which I think is quoted at 35V I think. Do you know how this would work for us, with systems running 50 - 60V. The midi fuses are frequently used in the like of car audio systems, and run around 12V. Andy |
06-10-2014, 07:07 PM | #10 (permalink) |
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Having done quite extensive research into this fuse business, I have been investigating the characteristics of various fuses, and would like to present a few of my findings.
The midi fuse style, measuring approximately 41mm x 12mm x 8mm (L x W x H), seem to come in a 'Slow Acting' format. This appears to mean that such fuses blow between a minimum time and maximum time dependent of the extent of the overcurrent extent related to specified rating as follows: Time Characteristic % of Amp Rating - Opening Time (Minimum / Maximum) 110% - (100 hrs / ) 135% - (90 sec / 3600 sec) 200% - (3 sec / 100 sec) 350% - (0.3 sec / 3 sec) 600% - (0.1 sec / 1 sec) These figures suggest that they are appropriate for our use, and compare with the fast acting fuses such as the Fork Lift fuses for 'Hazardous' and electronic environments. Such fuses are enormous in size, and if for no other reason seem inappropriate for our helicopter application. So, if we were to use a 200A rated fuse as Kontronik suggest, we would be good for 400A 'spikes' (200% x 200A) for a minimum of 3 sec and a maximum of 100 sec. This probably gives an appropriate response for the originally intended purpose of the fuse. What do people think? The holders, as previously shown, do vary a little in size but are a little bulky, but for a big 700 size helicopter, could be accommodated - 51mm x 27mm x 25mm (Littelfuse holder for Midi / BF1 style fuse), 43mm x 19mm x 16.5mm (Littelfuse In-Line Midi Fuse Holder), but this last is supposedly only rated to 32V use. What do people realistically think about the 32V / 58V fuse characteristic discrepancy for our high voltage helicopter usage? Regards, Andy |
06-10-2014, 10:35 PM | #11 (permalink) | |
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Join Date: May 2012
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Quote:
I'm more concerned with the voltage/current rating of fuse connectors within its housing....can't tell by just the picture. So, a Kon fuse will fit the housing...which is great. But what're the specs on the crimp connectors? If anyone can provide a link to the OEM manufacturer of this fuse housing, I'll call them up and find out....and if they're good, I'll find a distributor.....rather than an E-bay link(no offense wadders, this is a great item....if it can reliably handle the current by posting the specs....just don't do E-bay) |
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06-10-2014, 11:37 PM | #12 (permalink) |
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EEngineer, a company called 'Littelfuse' does a variety of these fuse holders for the 'Midi' fuses. They have their corporate headquarters in the USA:
Corporate Headquarters 8755 West Higgins Road, Suite 500 Chicago, Illinois 60631 United States +1 773-628-1000 These are pretty standardised holders coming in various configurations, but the specifications vary from 32V to 58V spec. Lots of distributors are offering similar systems. Regards, Andy |
06-11-2014, 04:05 PM | #13 (permalink) |
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Join Date: Jan 2007
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McMaster part# 70635K51 would certainly handle the load. It is rated for 35-600 amps at 125VAC or 80VDC.
I am unaware of the dimensions for the product though. It also lacks a cover. I'm not 100% sure this has the proper bolt spacing though as I'm not familiar with fuse types.
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06-12-2014, 05:00 PM | #14 (permalink) |
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These two specification sheets are quite informative.
The following fuse holder is quite compact, and looks well made, but is only specified to 32VDC I think, though I'm not quite sure how that specification relates to the component construction, may still be o.k.: http://www.swecheck.com.au/catalog/a82.pdf The following Midi fuses look the part, but only the fuses to 150A are rated at 58VDC, whereas the 200A fuse is specified to 32VDC only. I wonder if Kontronik's fuse is the same. http://www.swecheck.com.au/catalog/old_a29.pdf With the specifications, though, maybe for a Kosmik 160A, the 150A fuse would be enough? Regards, Andy |
06-12-2014, 10:19 PM | #15 (permalink) |
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Join Date: May 2012
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Andy, I looked over the LittleFuse website....that Ebay part might not be available from LF anymore....but I'm sure they'll have an adequate substitute.
I'll call their tech. support personal and explain what we're looking for. And report back with a suitable part #. FWIW |
06-13-2014, 12:10 AM | #16 (permalink) |
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Thanks EEngineer,
I reckon that a standard 150A slow-blow fuse and 32 volt holder would be quite adequate for my low demand purposes with the Cool Kosmik 160A. I am running low headspeed (about 1100 - 1600 rpm) on the Compass 7HV Ultimate with a 700XF-455-G3 motor. I think my current draw is minuscule. Thanks for your investigation. Regards, Andy |
06-13-2014, 05:07 AM | #17 (permalink) |
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Join Date: Feb 2008
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type: BF1-58
voltage rating: 58V melting time limits at 75% of rated current (200A): min/max 100h/- melting time limits at 200% of rated current (200A): min/max 1s/15s The fuse will blow so generally only after several seconds pending 400A. Actually, no reason to fear reliability could go by use of the fuse. The fuse itself is not rated at the voltage theoretically needed, and this voltage is (also theoretically) higher than max battery voltage. All theory is gray..
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