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Wiring Servo Directly to Battery
Topic Started: Nov 22 2007, 11:46 PM (310 Views)
Destroyer
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Thinking about wiring my Hitec 5995 directly to my main battery pack, since the Novak voltage regulator does not seem to provide enough power. I am going to be running an 8 cell main pack, but would like to draw power from only 5 of the cells (6V to the servo). Would doing this damage the battery pack in any way?
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TheROOSTER
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It won't hurt the battery. I tried it once though and what you end up with is a ground loop. After I would turn the truck on all the power wires got hot and started smoking.
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Destroyer
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So something like this is not a good idea?

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FishMaxx
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I smell smoke :blink:

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Voltage is only half the equation...............AMPS!

When your hard wired you have 4-5 times more amps than your servo can handle ready to travel down the wire the first time you get bound up.

Whats happening that's causing you to say the Novak is not enough?

Note: photo was taken by yours truly, so I have some first hand experience
Leave me alone .....I am pre-running courses in my mind!

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Destroyer
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The fact that the servo will not turn the wheels (on a 2.2) when the truck is sitting up against a wall (sidewall of the tire parallel to the wall) on carpet. 333oz oughta at least do that. :wacko: Won't turn the tires, push the truck away, or even bend the PLASTIC servo mounts. Just stops responding. Sounds like a lack of amps to me.
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FishMaxx
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The Novak unit isn't going to give you very many AMPs on 8 cells.

Need to buy one of the new "switching" BEC like the Castle, or you can do it your way and you will be buying a new servo someday :wacko:



Again see above picture..........I burned up 3x before figuring it out :angry:

:rockn:
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Destroyer
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I am having problems now, on 6 cells. I know it will get worse when I get the 8.
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TLTRyan
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Your novak regulator is rated at 3 amps. You ti-gear servo stalls at 4+ amps.
Maby you are overloading the regulator causing the servo to shut down?

I will bring my MPI regulator for you to try tomorrow. It is rated at 10A 6v output at 7.2v input
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Destroyer
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Thats what I am thinking. Just not enough output for the servo. I really don't want to run another BEC though...too many wires to worry about getting caught in gears/ driveshafts. I wonder if RX's have some kind of regulator built in for when people run RX packs in nitro applications. I know I never burned up a servo in my buggy, and it got bound up fairly often racing.
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TheROOSTER
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Nov 23 2007, 12:25 PM
So something like this is not a good idea? 

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Nope. That is exactly what I tried and somehow it ends up being in a ground loop. I can't tell you why. Samething happened to me as did Fish, execpt I burnt up both steering servos and the dig servo in my super all at once.

There are no regulators in a receiver either. The bus where the servos plug in are all in parallel. You can put power in any slot and get it back out of all the others.

I'm running the same regulator you are in my super and my 2.2. In my super it is powering both quarter scale servos and the receiver, in my 2.2 it is powering my dig servo, receiver and CS170 steering servo(has the same specs as a 5955). I have no problems except I had to add a heat sink to my super's because it got too hot. Maybe you have a defective one? I believe I have heard somewhere that the Novak's like more than 6 cells.
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