Voltage Cut

[elaerico]

Hello, my friends.
I bought reciently an ICS-400 Speed Controler, and now I want to actualize to LiPos.
How can I do a voltage cut off for 2 cell lipos?
Thanks

[AndyOne]

The speed controller probably does have a voltage cut-off, check the instructions that came with it. If it does, then the only worry is, does it match with the LiPo pack you have.
The cut-off should be between 5V and 6V for a 2 cell pack and between 7.5 and 9 volts for a 3 cell pack.
If you need to build one, there are circuits that have been published here in RCG so you could do a search on "voltage cut-off" but restrict the search to the DIY electronics section.

Andy.

[fhhuber506771]

Tower Hobbies sells a safety circuit to put betweent he RX and the ESC, then tap in a voltage sensor lead to the battery + lead which will cut-off the motor at the proper voltage for Lipos.

I am sure its available elsewhere (and that others are made)... but thats what you need if the ESC does not have the correct cut-off setting for LiPo

tower's search isn't working for me right now.. so I can't link the product. It comes in 2 versions.. 2 cell and 3 cell. Make sure you get the correct cell count version.

[Miami Mike]

Is this it?

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJDJ0&P=7

[fhhuber506771]

Thats not the one I was thinking of... but it would work.

The one(s) I was thinking of have preset SINGLE cutoff voltages. 6.0v for the 2 cell version and 9.0 v for the 3 cell version. (reasonably conservative cutoffs)

[Reveret]

I did a post back on May 27th under Wanted: Simple LiPo alarm, with the circuit I use to convert GWS controllers for LiPo use. The circuit is very simple and can be set for either 2 or 3 cells. I converted several controllers a couple of years back when LiPo compatable controllers were expensive. I have used the circuit now for a couple of years on GWS controllers and never had a battery problem with pulling the voltage too low. Check out the previous post. Hope it helps.