MSD043A1XXV Panasonic AC Servo Driver 400w - MB3 connection help

[Nemo1966]

Page 13 of the servo controller manual tells you all you need to know about the step/dir interfacing. It recommends a differential drive from the control system, but it's not required. You can use a standard single-ended drive - just connect Step/Dir to pins 6/8 and ground pins 5/7 (just check that - the scan isn't great). The internal 220R resistor is appropriate for 5V signalling.

Thank you.

A couple of things if I may?

One thing that sort of confused me when i first looked at the diagram - twisted pairs? You mention connecting Step/Dir pins to 6/8 and ground to 5/7. The diagram is confusing, it shows a single pulse going in e.g Pulse A and it terminates on 6 - 5???

Apart from where you cannot on the MB3 are the connections to the Sevo drivers the same? If using a single ended drive do i need to connect a 12 - 24v supply as mentioned on page 13? Do I need it for a differential drive?

The MB3 supports both.

Sorry for the basic questions - I just don't want to blow up the £200 MB3 breakout board.

thanks again - the advice is appreciated.

Edit: just found a better diagram (helps me understand) in the MB3 documentation:



I added the pin numbers from the Panasonic doc, does that look correct? How can you tell that pins 5, 7 are ground? (the scan shows order from top down (6, 5, 8, 7) as per my latest attached diagram.

Do I connect a dedicated 24v to pin 11+ and 28- ? For single ended? and not differential? Both or none?

thanks again

[Doddy]

Thank you.

A couple of things if I may?

One thing that sort of confused me when i first looked at the diagram - twisted pairs? You mention connecting Step/Dir pins to 6/8 and ground to 5/7. The diagram is confusing, it shows a single pulse going in e.g Pulse A and it terminates on 6 - 5???

The differential lines are - not clear admittedly - intended to show the interconnect between your control system (MB3 in your case) and the servo controller.

Apart from where you cannot on the MB3 are the connections to the Sevo drivers the same? If using a single ended drive do i need to connect a 12 - 24v supply as mentioned on page 13? Do I need it for a differential drive?

The MB3 supports both.

Ah, sorry, didn't realise the MB3 support differential drives. If you're taking the signal over any distance then a differential twist pair is beneficial for noise-rejection.

Sorry for the basic questions - I just don't want to blow up the £200 MB3 breakout board.

thanks again - the advice is appreciated.

Edit: just found a better diagram (helps me understand) in the MB3 documentation:



I added the pin numbers from the Panasonic doc, does that look correct? How can you tell that pins 5, 7 are ground? (the scan shows order from top down (6, 5, 8, 7) as per my latest attached diagram.

Do I connect a dedicated 24v to pin 11+ and 28- ? For single ended? and not differential? Both or none?

thanks again

The bits circled in red - these are the LEDs of the opto-isolator inputs. The lead connected to the triangular bit is "+", the bar crossing the pointy bit of the triangle is ground. Hence - ground is 5,7 and the signal positive is 6,8. To the immediate-left of these are similar symbols, but reversed - these are normal (non-light-emitting) diodes intended to protect the LEDs from a reverse voltage as would be presented by a differential drive (LEDs are susceptible to damage like this).

Also, confusingly, over on the left - the triangular line drivers - the bottom output wire has a little dot on it - denotes an inverted signal. So "PLUS A" (ignoring typo) is PULS - non-inverted (active = high), and "PLUS B" is PULS - inverted (active = low). You could interpret (wrongly) the cross-over in the wires as the wires swapping - that's not the intent of the diagram - it's supposed to show an indeterminate length of cable. The drawing is designed to confuse.

EDIT:


12-24V between pins 11 & 28 - these are required for the control inputs shown, nothing to do with step/dir but likely required to provide control to the driver.

[Nemo1966]

The differential lines are - not clear admittedly - intended to show the interconnect between your control system (MB3 in your case) and the servo controller.



Ah, sorry, didn't realise the MB3 support differential drives. If you're taking the signal over any distance then a differential twist pair is beneficial for noise-rejection.





The bits circled in red - these are the LEDs of the opto-isolator inputs. The lead connected to the triangular bit is "+", the bar crossing the pointy bit of the triangle is ground. Hence - ground is 5,7 and the signal positive is 6,8. To the immediate-left of these are similar symbols, but reversed - these are normal (non-light-emitting) diodes intended to protect the LEDs from a reverse voltage as would be presented by a differential drive (LEDs are susceptible to damage like this).

Also, confusingly, over on the left - the triangular line drivers - the bottom output wire has a little dot on it - denotes an inverted signal. So "PLUS A" (ignoring typo) is PULS - non-inverted (active = high), and "PLUS B" is PULS - inverted (active = low). You could interpret (wrongly) the cross-over in the wires as the wires swapping - that's not the intent of the diagram - it's supposed to show an indeterminate length of cable. The drawing is designed to confuse.

EDIT:


12-24V between pins 11 & 28 - these are required for the control inputs shown, nothing to do with step/dir but likely required to provide control to the driver.

Brilliant - thank you. I agree from a newbie veiwpoint the drawings are difficult to interpret if you aren't experienced in that arena. I'm 99% OK now. Still confused on the 24v bit though :-/

Can't wait until I have to put settings in Mach4 - that should be fun...

thanks again