Servo Power from the PWM Pins an RB-100???

[PaulL]

I would like to know what kind of amp draw would be safe on the Servo connectors without pulling too much current through the board.

Does anyone (Roboard?) know what is effectively a safe current limit for the power through the PWM connectors?

I know that the power for servos is the same as what comes over the power input pins (not regulated), but I am concerned with burning or bubbling / lifting traces on the board.

I plan on rewiring / re-routing power completely eventually (using only signal and ground pins from Roboard to the servos), but I have a bot-full of servos with 3 pin connectors on them and am wondering if I can power up without letting out the magic smoke.

Thanks,
Paul

[roboard]

I would like to know what kind of amp draw would be safe on the Servo connectors without pulling too much current through the board.

Hi, Paul,

for RoBoard, 10A is still safe (in our design spec. & test).

[PaulL]

Thanks, Roboard!

The HSR-5498SG's are 300 mA at idle (I forget if that's at 6 volts or 7.2), so 20 servos * 300mA = 6A, not counting what will happen if I move a few at full speed. I'm thinking I'll bus the power separately and run the signal pins and a ground to Roboard. I'll definitely need to do some testing to see what the current peaks at with these servos (I've seen no mention of peak current in the servo specs).

Thanks,
Paul

[matt.stevenson]

I wound up clipping the power lines from my pwm cables and hooking them up to a separate source.

My main reason for doing so is that I use varying power supplies and I don't want 15V going to my servos.

It's a tedious process when you've got 22 servos, but I had no problems.