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HV servo installation - 4/25/2012 9:04 AM   
tich


 

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From: oxford, UNITED KINGDOM
Status: offline 		I was wondering if you could advise on the installation of HV servos. In theory they run on 7.4 volts such as a 2 cell lipo. My questions are. What switch would you use on the system? Is the standard one okay. As you increase the number and performance of the servos the current draw will rise so how do you run a 9 channel receiver with say 7 or 8 high torque servos? Would you revert to the power box type solution or if not what would you suggest doing to manage the power supply.

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RE: HV servo installation - 4/25/2012 10:07 AM   
tomfiorentino


 

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Status: offline 		Tich,

You are describing and issue that typically is solved with using redundant battery packs or dual power feeds from one pack. With that many servos though I would use dual batteries.

As far as the switch I use either the Electro Dynamic or JR Heavy duty...the wolverines are nice too but expensive. I would have to double check these for HV but not thinking it would be a problem.

Tom

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RE: HV servo installation - 4/25/2012 10:56 AM   
tich


 

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Status: offline 		Hi Tom
thanks for the quick response. With Spektrum you can use a data safe receiver and be good for 35 amps so no worries. The Hitec receivers dont feature the power input arrangement so you are back to the standard plugs with its potential limitations. The typical servo socket is really only good for 5 amps so there is a real potential that the sockets may get overworked if you run a single/dual battery. Obviously You also need to ensure that the wiring is adequate for the current. I haven't seen much discussion of how best to wire these servos in hence my question.
Cheers
Ian

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RE: HV servo installation - 4/25/2012 11:45 AM   
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Status: offline 		Right, and if you use a powersafe receiver with EC3 connectors its even better because you can eliminate the traditional switches as those units have the soft switch included. Then you only need to provide for a port to charge the batteries.

Sounds like you are on the right track.

Tom

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RE: HV servo installation - 4/25/2012 1:23 PM   
tich


 

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Status: offline 		Hi Tom
glad you agree that that's the right way to go on spektrum. The question is though, How do we match this sort of set up on Hitec receivers?

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RE: HV servo installation - 4/25/2012 4:53 PM   
tomfiorentino


 

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quote:

ORIGINAL: tich

Hi Tom
glad you agree that that's the right way to go on spektrum. The question is though, How do we match this sort of set up on Hitec receivers?


Tich,

As a general comment...you are not going to get close to those amperage numbers. I could be wrong, but that is why I suggested the dual batteries because it the total demand of the system is split 50/50 to each battery and it's connectors. Short of that I would look at something like the attached link:

http://www.smart-fly.com/products/Expander/expander.htm

Either way though, you may want to jump over to the giant scale forum. There are probably plenty of guys there that have already done exactly what you are looking to do with your setup.

Tom

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RE: HV servo installation - 4/25/2012 6:10 PM   
tomfiorentino


 

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Status: offline 		Rich,

Check this out...Hitec equipment with HV servos.

http://www.****/forums/showthread.php?t=71789

Tom

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RE: HV servo installation - 4/25/2012 8:32 PM   
A.T.


 

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quote:

ORIGINAL: tich    I was wondering if you could advise on the installation of HV servos. In theory they run on 7.4 volts such as a 2 cell lipo. My questions are. What switch would you use on the system?
Is the standard one okay. As you increase the number and performance of the servos the current draw will rise so how do you run a 9 channel receiver with say 7 or 8 high torque servos?
Would you revert to the power box type solution or if not what would you suggest doing to manage the power supply. 


Optima Transceiver (RX) - Dual or Multiple Batteries may be installed - Avoid Brownout
& Add Redundancy, even one for each servo.
 .Use a separate  Hitec heavy duty switch, as supplied with the A9, for each pack.
Optima Transceiver (RX) - PowerExpander Connections NB: also refer "After Market Accessories" above.

Alan T.
Alan's Hobby, Model & RC FAQ Web Links    

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RE: HV servo installation - 4/25/2012 8:51 PM   
tich


 

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Status: offline 		Alan
thanks for getting back to me. If I read the links correctly two packs will basically cope with 4 high power servos if you assume 3 amps per servo and a 6 amp limit on the plugs in the system. If you want to be on the safe side above this I guess the power expander is the recommended route. That isnt readily available in the UK so I was wondering what else to consider. Is it worth using more batteries and switches to cope or perhaps adding multiple leads to the existing batteries so that the current to the plugs is managed?

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RE: HV servo installation - 4/25/2012 9:26 PM   
A.T.


 

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quote:

ORIGINAL: tich  Alan
thanks for getting back to me. If I read the links correctly two packs will basically cope with 4 high power servos if you assume 3 amps per servo and a 6 amp limit on the plugs in the system. If you want to be on the safe side above this I guess the power expander is the recommended route. That isnt readily available in the UK so I was wondering what else to consider. Is it worth using more batteries and switches to cope or perhaps adding multiple leads to the existing batteries so that the current to the plugs is managed?


Have not used any after market accessories on own large 100cc+ models, rather all servo positive leads are attached to a solid copper bar (Electrical Conductivity of Materials) "power bus" and only the negative and signal leads go to servo ports, except for the power lead from each HD Switch to receiver..
This, following the KISS principle,  to overcome possible weakness on the plug/socket connections.
Whilst I have not yet installed any HV servo in my models, I would still use the same system.

more under "Giant Scale, Large RC models, Twins & Multi Engines" at
Alan's Hobby, Model & RC FAQ Web Links

Alan T.

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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> HV servo installation
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