servo control vs stepper control

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Originally Posted by boldford

They are 1K.

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Ok, so 5mA collector current on 5v, 24mA on 24v.. so it wont fry :)

EL817 optos are rated 35v, 50mA so should be ok.

However, as I recall the diode has a 330R series resistor so forward current is about 10mA and those devices have a transfer ratio of about 1.1. So with 10mA in the diode the collector current is going to struggle to be more than 11-12mA which means the output volts wont drop below about 12 - 13v, so though it won't fry its not going to work. No good on 24v :(

Help me out here a bit folks.

After trawling through 300-odd pages of servo amplifier manual which seems to have every bit of information you could possibly want for the Mitsubishi drive - I can't for the life of me get the faintest idea how it could be connected to accept step & direction commands from Mach 3. What is the usual command process for controlling servos?

Not all servo drives can handle step/dir. Analogue control is far more common in industrial drives, so you need a suitable interface to take the step/dir and convert them.

Search/ask on the Mach forum (www.machsupport.com/forum), as there are a couple people on there who know about servos.

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Originally Posted by Peter.

Help me out here a bit folks.

After trawling through 300-odd pages of servo amplifier manual which seems to have every bit of information you could possibly want for the Mitsubishi drive - I can't for the life of me get the faintest idea how it could be connected to accept step & direction commands from Mach 3. What is the usual command process for controlling servos?

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Give us some model numbers etc and I'll have look for you.

Thanks Jazz

Lexium LXM05CD10M2
and
Mitsubishi MR-J2s-10A