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Old 08-30-2009, 03:53 PM   #11
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Re: Ubec hook up

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Originally Posted by Jackedman View Post
What do you do if you dont have the batt port on the rx??
Plug it into any unused port . If all are used use a y harness
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Old 08-30-2009, 08:17 PM   #12
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Re: Ubec hook up

As I mentioned before, since you don't want the motor live in any event, unplug the ESC lead from Channel #3 and plug your batt in there. Once everything is rigged and you are ready to try and fly plug the ESC lead back in.
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Old 08-30-2009, 08:43 PM   #13
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Thumbs up Re: Ubec hook up

Originally Posted by Cougar429 View Post
The conection advice you received is good, although I would also advise you to pull BOTH the red and black wires from your original ESC to RECEIVER plug. Otherwise, when you connect the new BEC you can create ground loops and allow interference to get to the receiver. You need to keep the white, (or yellow or orange) signal wire to keep the ESC throttle signal.

This is easy enough to do. Lift the little plastic tangs that hold the connections in the plug and pull them out. Be sure to tape each separately so they do not touch. If you do not have any open channels to plug the separate BEC into, you can tie that BEC and the stock ESC signal wire into one common plug on Channel #3. All of the channels are tied together on power and ground, so input to any feeds all the others, (with the exception of the BIND plug on some 2.4 receivers). Under NO circumstances do you want to feed your power into that one.

Just be aware that BEC's are power limited. What this means is that the higher the input voltage, the lower the output amperage to feed your radio system. A good example is the Castle Creations 10A unit. When running higher input voltages that output actually drops down to 5A. The UBEC you link to lists 3A, but I'd be wary that rating is at the very bottom of the input voltage range. In your case this is 5.5 to 23V.

If you are running digital servos best check their specs to see what current draw they have, particularly under load. Some of the larger servos can draw up to 1.5A alone, so you can see where this math is going.
I'd like to comment on a couple of the points made in your reply.

1) The ground loops you referred to are not correct in this instance. The signal wire for the ESC needs a local ground reference FROM the receiver. I wouldn't expect the path from the battery through the BEC to be as accurate. The BEC current is returned in the ground wire creating a voltage drop in that path.

2) POWER Limited... You must be referring to the LINEAR BEC's that were introduced years ago. Most modern BEC's (like the one he's posted about) are switch mode BEC's and they are limited only by the FET's used in their construction. They do not dissipate heat based upon the input voltage. They will PWM to switch energy to the output bypass caps. This makes them very efficient (~80%) versus <60% for linear regulators.

I am only writing this to get the proper information out there. I am an electrical engineer by trade and my companies bread and butter is the design and manufacture of IC's for switching power supplies and regulators. We have chips in lots of high profile products like the I-Phone, Garmin GPS's, and various high volume consumer products.

And my personal preference is this BEC when 4 or fewer regular or mini or micro servos are used.:
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