Faro backup battery - project

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max72
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Faro backup battery - project

Post by max72 »

I would like you opinion about the possibilitybto use an external battery with the scanner.
Considering I couldn't access the SDK even after Oliver help I assume extra informations about the hardware are not available.
So..
External plug requires 19V (no margin) and 4.3 A
With the multicopters 6s batteries are easy to get and rather cheap.
They have extremely high discharge rate (with respect to our needs) and a voltage range between 19.2 and 25.2 V, nominal voltage of 22.2V
With such a low voltage drop a linear regulator is a good candidate.
It wouldn't use the full voltage range (a 5A linear regulator would drop 1.5 V) but the efficiency would be acceptable.
A 5A switching regulator is more complex, and with such a low voltage drop the benefit is very limited and questionable.

So for the bill of materials:
6s batteries and charger

Voltage regulator composed of linear regulator, connector (Lemo?), a couple of good passives and a heat dissipator

It would be plugged in a working unit, offering extra juice and charging the internal battery on the go.

Your insight is welcome.

Massimo
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Re: Faro backup battery - project

Post by jcoco3 »

Massimo, I too have given some thought to an external battery pack, even to the point of contacting Lemo to find out what the new model number is for the connector(the old number from Faro is obsolete). I forgot the number, but if you ask for the old part they will refer you to the new product...which is about $50.

While I think your design would work, I am not sure I would want to use the RC Lipo batteries due to the extra volatility they have. They are also a pain to charge. Just my preference, but why not simply use the Faro Car charger connected to a Sealed lead acid car battery(or smaller) using a cigarette lighter adapter:
Adapter.jpg
Probably too much bulk, if I had to guess.
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Re: Faro backup battery - project

Post by max72 »

Thanks,
the main advantage of Lipos is their portability.
You can strap a pack to the tripod and move the setup.
With lead gel batteries you should use smaller packs or have more difficulties moving the tripod, but they are more tolerant to charge/discharge cycles.

A 7Ah 12V lead gel battery is about 2.15kg.
A 8000 mAh lipo 6s is about 910g, and the shaper is usually more elongated, so strapping to the tripod should be easier, but 4-5 times more expensive...

50$ for the Lemo makes sense. Add 30$ for the electronics, a lipo discharge alarm and you are in the sub 100$ range.

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Re: Faro backup battery - project

Post by max72 »

jcoco3 wrote:Massimo, I too have given some thought to an external battery pack, even to the point of contacting Lemo to find out what the new model number is for the connector(the old number from Faro is obsolete). I forgot the number, but if you ask for the old part they will refer you to the new product...which is about $50.
Do you have the older number?
I cannot find it anywhere on the documentation.

Edit: The connector has written the model: FHG.0B

Thanks,
Massimo
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Re: Faro backup battery - project

Post by max72 »

Just another update:
I chatted with a Lemo representative, and the new part number (solder pin) is:
FPG.0B.305.CLAD42


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Re: Faro backup battery - project

Post by jcoco3 »

Edit: you beat me to my response:)

Sounds like a good plan.

The old LEMO part number is FHG.0B.305.CLAD42ZN
You can find this and the pinout on page 45 & 46 of the Faro Automation Interface manual.
http://knowledge.faro.com/servlet/fileF ... t__Body__s

I asked LEMO what new number is again:
LEMO UK
Good morning, this will be FPG.0B.305.CLAD42Z and the strain relief boot will be a separate part number - GMA.0B.035.DN.
I also found the Digikey part numbers for you which should make ordering easier:
Connector - FPB.0B.305.CLAD42Z-ND
Boot - 1124-1083-ND

Links to each at Digikey:
http://www.digikey.com/scripts/DkSearch ... 7119563454
http://www.digikey.com/scripts/DkSearch ... 7119563454
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Re: Faro backup battery - project

Post by max72 »

Problem is no one has them in stock. Digikey, Mouser, RS.. I contacted Lemo directly.
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Re: Faro backup battery - project

Post by davecrossley »

Massimo
If you don't mind using a straight Lemo connector then this is perfect
http://www.ebay.co.uk/itm/291296868905? ... EBIDX%3AIT
and being pre-wired it saves doing the fiddly soldering - but move quickly as it's the last one remaining! I have used one to make up a battery pack combining a 2Ah lead acid battery with a Lind 12v/19v adapter - total cost £50 and a couple of hours. It's not intended to run the scanner for any great length of time, but to enable us to hot-swap the main battery without powering down - I hate down time :D
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Re: Faro backup battery - project

Post by max72 »

Nice one!
Unfortunately they don't ship to Italy.
I contacted the seller to see if we can arrange the shipment.

Thanks,
Massimo
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Re: Faro backup battery - project

Post by davecrossley »

That's annoying especially as I had checked the listing to see that they shipped to Europe before posting and now someone else has nipped in there and bought the last one. Never mind, I have a spare - so if you are able to PM me your address I will send it on to you. Unfortunately, even though I have been on the forum for 5 years, I read more than I post so I'm still not deemed worthy of PM privileges (nudge for any Mods reading this..)

Dave
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