problems with dual redundant system  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Smart-Fly (Quest Engineering) Support Forum >> problems with dual redundant system
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problems with dual redundant system - 10/10/2005 1:38:58 PM   
sbaugz


 

Posts: 772
Joined: 6/17/2003
From: waukesha, WI, USA
Status: offline 		I am having a problem with my dual redundant system. i am using a futaba PCM receiver and two 6V 1500mAh NiMh packs. Each pack has its own Cermark HD charging switch. One switch/battery is plugged into the battery port and the other switch is "y'd" to the choke servo. I am charging with an accucycle elite. The elite will charge both packs at the same time when I connect the charger directly to the batteries (bypassing the switches). It will also charge the packs individually through the switches. The problem I am having, is that as soon as I connect the charger to both switches and attempt to charge both packs at the same time (through the switches), I get an overvoltage error. I have read some of the posts down lower in this forum and seems to have found my answer- both switch/packs have the same common ground right? So my charger has a problem with this?
In the meantime, I have ordered a battshare from the smartfly website, and am wondering if that will solve the problem. With the battshare, does that isolate both systems such that I will be able to charge both at once using the switches?

Finally, I am obviously using dual packs to provide extra safety in the event of failure. What happens if the battshare fails? what will the packs do?


< Message edited by sbaugz -- 10/10/2005 1:46:57 PM >
       Post #: 1

RE: problems with dual redundant system - 10/10/2005 3:38:42 PM   
rrritchey


 

Posts: 640
Joined: 9/29/2004
From: Phoenix, AZ, USA
Status: offline 		Hello,
I do think you are running into the common ground problem. The BatShare will not solve this as it also has a common ground inside it. There is really no way around this other than
charging one battery at a time or taking at least one battery out of the system and charging it separately.
The BatShare has two independent diodes in it, one for each battery. A diode will fail as an open (I have not ever seen it happen on a BatShare but that is how they fail) so the other diode will be unaffected and continue to supply voltage to the system.
Let us know if we can be of further assistance.


_____________________________

Robert Ritchey
Owner, Smart-Fly

(in reply to sbaugz)
       Post #: 2

RE: problems with dual redundant system - 10/10/2005 4:01:41 PM   
sbaugz


 

Posts: 772
Joined: 6/17/2003
From: waukesha, WI, USA
Status: offline 		Thanks for the info. I figured it was the common ground thing. As mentioned, I ordered a battshare from your website. I am not sure I really need one since both packs are the same capacity, but i will probably use it anyways. Thanks again.

(in reply to rrritchey)
       Post #: 3

RE: problems with dual redundant system - 10/10/2005 4:12:32 PM   
rrritchey


 

Posts: 640
Joined: 9/29/2004
From: Phoenix, AZ, USA
Status: offline 		Hello,
If you want to cancel the order that is fine. Just e-mail us.


_____________________________

Robert Ritchey
Owner, Smart-Fly

(in reply to sbaugz)
       Post #: 4

RE: problems with dual redundant system - 10/10/2005 4:53:17 PM   
sbaugz


 

Posts: 772
Joined: 6/17/2003
From: waukesha, WI, USA
Status: offline 		I think I will cancel. Thanks for the information.

(in reply to rrritchey)
       Post #: 5

RE: problems with dual redundant system - 10/10/2005 4:55:29 PM   
rrritchey


 

Posts: 640
Joined: 9/29/2004
From: Phoenix, AZ, USA
Status: offline 		Hi,
OK, I found the the order and will cancel it.


_____________________________

Robert Ritchey
Owner, Smart-Fly

(in reply to sbaugz)
       Post #: 6

RE: problems with dual redundant system - 10/10/2005 4:58:03 PM   
sbaugz


 

Posts: 772
Joined: 6/17/2003
From: waukesha, WI, USA
Status: offline 		Thanks for your honesty. I haven't seen many companies that actually tell you when you don't really need one of their items. I appreciate your help and will definately use your products next year when I upgrade to a larger plane.

(in reply to rrritchey)
       Post #: 7

RE: problems with dual redundant system - 10/10/2005 5:33:16 PM   
rrritchey


 

Posts: 640
Joined: 9/29/2004
From: Phoenix, AZ, USA
Status: offline 		Hi Steve,
I just do not believe in selling you something you don't need. I knew this would not solve your particuar problem so unless you wanted it for other reasons you might as well save your money for something you do need.
Thanks,


_____________________________

Robert Ritchey
Owner, Smart-Fly

(in reply to sbaugz)
       Post #: 8

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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Smart-Fly (Quest Engineering) Support Forum >> problems with dual redundant system
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