No, no, sorry for my bad explanation. I were using a 9V battery for VL and extra power for VS, and it was not working fine. Now i’m using the single mode using the extra power from a DC adapter, and it works fine because it starts good, get the firmware version with the propertly command, but when i try to move the servo, it only vibrates and can’t move…
the 9V isn’t especially healthy for most servos either but fortunately the battery probably gets chewed up before the servos do.
Well we’re going to need more information in order to help.
What is the voltage and current of the wall pack.
Can you post images if the wiring somewhere and put the link here?
Can you show me the commands you have tried using?
What is the make and model of the servo? Have you used it before?
This is the galvo i’m trying to run, i didn’t use it before.
servocity.com/html/heavy_dut … tors_.html
The voltages i tried are 4.5 and 6 with 1000mA
Sample command #0 P1700 S1000
The wirings are right, it’s not difficult 
Try 6v @ 2 amps and then give us a hollah.
I did not know you were trying to run those monsters 
, I pictured tiny standard servos in my head. 
Well their specs say…
Current Drain (6.0V): 11.9mA/idle and 450mA no load operating
But there could be a decent current spike when starting a move. While the wiring is not difficult you could have made some common errors such as little bitty wires, or insufficient connectors. Many things can effect if the current needed by the servo is actually making it to the servo.
The problem you are describing is in fact the SSC-32 resetting due to an insufficient power delivery system. The known solutions are:
-
Power the VS1 and VL (VS1=VL jumper installed), and use a powerful 6.0vdc supply.
-
Power the VL with a separate 9vdc battery, power the VS with a 6vdc 2amp or more supply, and REMOVING the VS1=VL jumper. But you insist that you must power it from a single source, which sorry, is wrong.
oh man like 1/2 an amp when you tell them to move with no load! I’d bet them babies stall at near 5A. Maybe find a 6V alkaline lantern battery or something BEEFY and don’t be wiring it up with 24AWG wire between the battery and the VS1 and VS2 terminals.
Be cool to see 'em work though. 
mm ok, i’ll try that.
Lookig at the specifications i couldn’t think the problem was the power. I couldn’t find any power supply stuff in the same websites where they sell the servos, so i thought it was not a problem.
Do you think i can use a PC power suply for that ?
Maybe, but how many of those bad boys are you wiring up? For just 1 or 2 it is probably overkill.
The reason I suggested the 6V lantern battery is you can get them from like K-mart / Walmart / Costco easily enough in the camping areas, if you get the version with screw terminals it’s real easy to hook nice 18-20 AWG wire up to them, and they are like 15-20 amp-hours (depends on the brand) which is just all kinds of beef at a nice safe voltage.
Another approach might be to use a cheap normal hobby servo, get it working to prove it’s all wired up right, then replace the servo with the actuator and any problems from there are most certainly power related.
Great idea using regular servos. I assumed they were standard too. A dying 9V threw me for a loop for a while even when I had a separate power supply for the servos so power delivery does need to be consistent
What are you doing with these huge ones anyway? Just curious. Whatever it is, I’d like to see the end result.
Sure, i’ve just tried to use this other servo:
servocity.com/html/gdp785a-b … ystem.html
and it works nice.
*> One question about servo limits… at SCC32 manual it’s explained that servo have limits and i can damage it if i don’t take care of it. I put a wrong command on lynx term and it got rotating for twice 360º.
- Where are the limits?
- what can be damaged?
I was looking for the PC power supply and it have a red wire that can give 5V 32A, i could try it.
Now i’m using every servo once, not simultaneous, but the systen will have three big servos, i hope it’s enough.
I don’t need batteries because it’ll be static and i can have wall pack power or somthing like that.
I’m building a big laser pointing system, with high precision for large distances at outdoor laser shows
I’ll post pictures or videos when it’s ready. I’m waiting for the hardware stuff this week, i’m impatient hehe
News on that issue:
Finally i used a 6V, 2A power supply and it started to work, i could move in both directions with different speeds. The problem now is that the servo isn’t responding with precision to the commands. Sometimes it move fast but not exactly to the point i want, some other times, it moves only a bit on every command i put.
Why it’s sooo difficult??
Help please
Quick test. If a normal unmodified servo responds the way you think it should, then you are probably dealing with an issue with the linear actuator.
If it’s using a standard (non specialized) servo control board. Meaning a standard Hitec or Futaba control PC board. It may be that the PID isn’t matching the motor / gear reduction / potentiometer combination. You see the control PC boards are designed for a specific motor / gear reduction for a good response. Because this device has a lot of gear reduction it may be slowing the motor in it’s normal acceleration / deceleration way too early. Also, they say the dead band is 8uS. So you will have to move it farther than that to see any motion at all.
I seriously doubt it’s got anything to do with the SSC-32.
Can you be more specific in the description of the problem. What position values are you using to get what results. The more accurate the information the better we can determine the problem.
for example
#0 P1900 S2000
It should move from actual position (center) to that 1900 point. I’ve been using that kind of commands several times, and the servo can’t do the expected.
- It sometimes moves to the end.
- other times a few steps.
- other time it only moves a simple step and i can repeat the same command but it always move one step on every command sending.
In a few words, the servo gives aleatory responses, not the expected.
The support team from the website where i bought it, told me before ordering the product that the SCC-32 is great for that linear actuator, it should work fine 
I’ve two linear actuator, i’ll try with the second now, to discard that possibility.
You may want to put a multimeter across the power to the actuator to see what the voltage drop is when the actuator tries to move. You might also try large moves without the speed control and see what happens.
Yes, not sure why you are even using the speed command on an actuator that takes a full second to move 1/4". No need to slow this down.
wow, Against all odds, the problem seems to be the baud rate jumpers.
I pushed then a bit and the servo works perfect now, maybe they had some noise because oxidation or whatever…
At least by now, it works very good, i hope not to have the same problem again tomorrow.
Thanks all