Another EMCO PC55 project

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19 Jun 2020 19:14 #172096 by Timthor
Replied by Timthor on topic Another EMCO PC55 project
Cool! That worked. I'm still not getting action from my motors tho'.
The step and direction timing must be off. I cant seem to find a direct value in the information online. Does it require some calculations or should it be clearly stated?
I am using the original 3 phase steppers (VDRM 66) with Smartrayc drivers(3DM580S). The motors are getting power and I can manage the heat generated by changing the amperage via the dip switches. So, the drivers seem to be functioning properly. Any ideas?

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19 Jun 2020 22:19 #172114 by PCW
Replied by PCW on topic Another EMCO PC55 project
Normally step/dir timings are minimum values so if you use a large value
like 5000 ns or even 10000 ns, it should work with most drives.

The only disadvantage of large step length and stepspace timings
is that they will limit the maximum step rate, but this is only an issue with
higher performance step and servo drives.

The 3DM580S drives should work at 2000 ns so I suspect a wiring
or other issue. How are the step/dir signals wired to the drive?

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20 Jun 2020 20:53 #172188 by Timthor
Attachments:

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20 Jun 2020 20:57 #172190 by tommylight
Are the motors moving ?

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20 Jun 2020 21:13 #172193 by PCW
Replied by PCW on topic Another EMCO PC55 project
It looks like you are using differential signaling, sometimes that doesn't
provide enough drive current. I would try at least one axis wired single ended
to see if that fixes the issue:
7I76 DRIVE
+5V --> PUL+
STEP- --> PUL-
etc

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20 Jun 2020 21:54 #172197 by Timthor
Replied by Timthor on topic Another EMCO PC55 project
I’m sorry for my ignorance. I don’t comprehend your suggestions. Could you spell it out for me? I don’t understand differential or single ended signaling.

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20 Jun 2020 22:20 #172200 by PCW
Replied by PCW on topic Another EMCO PC55 project
Differential:
7I76E      DRIVE
STEP+      PUL+
STEP-      PUL-
DIR+       DIR+
DIR-       DIR-

Single Ended:
7I76E      DRIVE
+5V        PUL+
STEP-      PUL-
+5V        DIR+
DIR-       DIR-

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01 Jul 2020 03:22 #173286 by Timthor
Replied by Timthor on topic Another EMCO PC55 project
ugh. Tried pulling 5v from the other terminal. no joy. I tripped across an article on cnc zone regarding the servos being 72 step servos. Would that have anything to do with my issues? www.maxton.com/ebay/emco/EMCO%20Compact%...ion%20to%20Mach3.pdf

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01 Jul 2020 11:42 #173310 by andypugh
Replied by andypugh on topic Another EMCO PC55 project
Number of steps would put the scaling off, but nothing else.

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