Dc servo driver

Hi all,

I bought 3 dc servo drivers off eBay and cannot really find any information on the case to get any further detailed information :(

I have the matching motors for the drives which are wired into blocks which slot in so they are no problem.

This leaves 7 terminal screw blocks.. I've done a test using an old atx psu powering it up using 12v and the motors ran. The supply was connected to terminals 5 and 7 so I assume that 6 is for a ground. Terminals 1,2 and 3,4 are respectively shorted with bits of wire.

so can anyone help me figure out what 1,2 and 3,4 are and how I may control it?

I can add a picture tomorrow if that will help.

many thanks,
Sam

Is there and make or model number on the drives?

Nothing at all, I'm led to believe that they are made by Japan servo co. ltd since they match the motors but from the limited information on the motors I cannot find anything more about them...

These are a couple pics of the drives in-case my description was a little off

Attachment 8107Attachment 8108

Silly thought, don't suppose it has an encoder? G.

Hi G,

I do believe the motors have encoders attached, I can add pictures of the motors tonight If it helps!

Cheers,
Sam

Might be worth removing the cover from one of the drivers and having a look to see if there is any lettering on the circuit board which might give a clue.

Hi Sam, I only mentioned the encoder in case that was the answer to the extra wires! G.

Hi G,

the encoder is connected using a push in connection. I can only guess that 1,2 and 3,4 can somehow be used to control the motion. I guess that when one set is not shorted the motor will run in reverse leaving the other one as a step input? I will update the thread later when I've tried!

Cheers,
Sam

Hi all,

I've had another tinker and these combinations will start the motor spinning (always same direction):

Pins shorted:
1 , 4
1 , 2 and 3 , 4

I have a multimeter If there are any readings that may help work out the pin configuration.

Hi all,

I have spent another couple of hours tinkering with this driver, It apepars that pin 4 accepts a pwm signal which controls the speed rather than setting a position, and that pin 3's is used to vary the torque, IE when grounded the motor increases speed alot.

Could do with a guide! figuring out electronics for noobs lol.

After doing alot of reading, the motor has hall sensors + an encoder (2 wires) + wires to windings. So I assume that if there is an encoder then either that information is made available via an I/O or it must accept a position signal?

Any help or Tips / ideas most welcome!

Cheers,
Sam

I'd guess it's most likely an analogue servo drive that takes +/-10V to control the speed, however they generally wouldn't need to see the motor encoder, as the motion controller would deal with the position side. Unless it's a motor with built in field sensors that the drive needs to see inorder to actually power the motor correctly (I'm having a complete blank about the proper name of this style of motor!).

Any chance of some pictures of the motors?