got the PS2-SMC-04 Servo Motor Controller Interface hooked up to 4X HS-422 Servo moters and 4X HS-755HB servo moters. Slit to fit into the 4 board jackets with 4 Y spliters. i can make 3 of them work and the board works okay. when all eight are hooked up the board refuses commands from the controller. need help solving the issue. the instructions for that board are horrible aswell
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Sounds like a power problem. What supplies are you running on?
Alan KM6VV
I’ll second Alan’s diagnosis - sounds like a power issue.
6v 2800mha nimh batterie anyone have a recommendation on a bigger batterie that will work?
If each 755 servo is under high load, the current required might easily be 1A (so four servos = 4A). If you add four 422 servos under load, the current draw may be as high as ~5A. Most NiMh batteries can supply around 1 to 1.5C continuously. For a 2.8Ah battery, that means 2.8A to 4.2A continuously. If you don’t have much load, a 2.8Ah pack should be ok, but the startup current is higher than the current draw under load. Note too that a normal RC servo cable may not be able to handle a high current draw over a longer length of wire, and the junction of the Y-harness will have to handle twice the current. Hope this gives you some ideas.
A guy can link 2 of them batteries in series can he?
Yes, but the next question will be if the wires can handle the increased current. Most likely they can, but be sure to check the connections.
@tankzigzager,
As discussed on our Support Center, we think the problem you are experiencing come from the power.
Since all the connected servo are powered through the internal voltage regulator on the controller, it’s exceeding the maximum of the regulator.
Even if you have batteries which can provide the current, the bottle neck is the voltage regulator.
You will need to power them as described by the manufacturer PDF file attached.
instructions-ps-smc-04a.pdf (765 KB)