Convert to Gecko 320 From HP UHU

[contactirfu]

Hi,
due to a lot of overruns reported on the UHU I am forced to get myself move on to Gecko's.

Before fully converting I need some info.

1. How do we see a over-run (missed step) on the encoder in a Gecko.
2. My encoder cables are a max 8 meter on Z so I am planning on differential driver and receiver using a 26LS31 and 32. so do I need seperate power supply for em? if so ones made of 7805 will suffice? and if I am right I need one for each drive.
3. Do I need a reverse current/ voltage protection - I am operating my drives at 75V 8 Amps. continuous.

I am a using a Mini IO BOB from Tom Caudle.

RGDS
IRfan

[TOTALLYRC]

Originally Posted by contactirfu Hi, due to a lot of overruns reported on the UHU I am forced to get myself move on to Gecko's. Before fully converting I need some info. 1. How do we see a over-run (missed step) on the encoder in a Gecko. 2. My encoder cables are a max 8 meter on Z so I am planning on differential driver and receiver using a 26LS31 and 32. so do I need seperate power supply for em? if so ones made of 7805 will suffice? and if I am right I need one for each drive. 3. Do I need a reverse current/ voltage protection - I am operating my drives at 75V 8 Amps. continuous. I am a using a Mini IO BOB from Tom Caudle. RGDS IRfan

Hi contactirfu,
I will take a stab at this.

If i remember correctly the g320/340 have a following error built in. as long as they stay within this error range there is not a problem. The following error isn't very large and is only active when you are moving, the drive will end at the position that it is programed to within a very samll tolerance. I believe within a few encoder counts max. There is normally a very small deadband or other meens to prevent the motor from dithering back and forth between encoder counts and buzzing and burning the brushes and comutator.

If it gets out of the window for the following error it will fault out. You can connect to the error/reset terminal to get this information back to the computer I am pretty sure or to at least trigger an e-stop.

On my BTC-1 with the Dspmc-ip controller I had to go from single ended encoders to differential encoders. I used the same chips that you are using. You will need to make up a tranmitter/reciever pair for each encoder.
As far a suppling power to them you could use the same power supply for all of them but it must be a well regulated power supply. Fom the literature that came with my chips I believe that a 7505 based power supply would have the regulation needed to run the 26LS31 and 32. Just be sure that you don't overload the 7505..

I am not sure what you mean by #3.

I have 2 of the mini I/O from Tom and I like like them.

And as always somebody will step in and correct me if I got something wrong.
After all we are all human and even the best of us make mistakes.

Regards, Mike