Servo problem ?

[Richard t]

I'm in the process of building my Losi 22 and I got out my brand new Spektrum servo and hooked it up to the reciever in my Xxxcr to center it well I then cycled it several times and it would start self cycling left to right but if I centerd the transmiter it would stop. So thinking I had a faulty brand new Spektrum I got out a brand new Savox servo and guess what it does the same ? But the plot thickens the servo in the Xxxcr is a less expensive, less torque slower speed Futaba and it operates fine?
Anyone have a suggestion, help....

[MRD]

What ESC are you using? Ive had problems like this before and its down to the ESC not supplying enough power via the BEC to make the servo work properly. Ive had it happen with mtronics brushed ESC's and a cheap LRP brushed ESC but not with any of my brushless ESC's.

If it is that I don't think there's much you can do about it. These new powerfull servos are quite power hungry.

[reg]

i think this is why people are fitting power caps in there recievers,it stores just enought to be able to power the servo,sorry if iv understood it wrong but i think that will sort it

[Richard t]

I'm using a Tekin rs brushless esc. Would a Bec help ?

[Richard t]

I think I figured it out the Tekin rs has adjustable BEC settings, so I'll see what happens after I try that.

[reg]

i dont know what a BEC is but i hope you have found a solution

[MRD]

Originally Posted by reg

i dont know what a BEC is but i hope you have found a solution

Its the Battery Elliminator Circuit which is what gives your reciever the 6v it needs to operate the radio and servo.

Some older ESC's have a lower amp BEC and its not enough to operate the modern fast servos. Older fast servos's were FET which took their power direct from the ESC/Battery so the BEC only had to power the radio, but with the decline of FET servos the BEC on modern ESC's needs to deliver more power.

There's also the problem of some ESC's not supplying enough power to the Spektrum recievers when using good servo's which causes the Reciever to go into failsafe when under full acceleration and turning at the same time. This can be helped by fitting a reciever capacitor which stops the suddern voltage drop which causes the reciever to go into failsafe but its not a perfect cure.

Ive had just about every power problem there is and Ive solved them all by just using a good ESC, thats why I have 6 LRP Sphere's .