Fanuc servo motors, early red cap.

[cis]

Dear Keith,
I m working on a retrofit of a Colchester lathe, with a OAK board, and have some questions.
I m just checking if the original Fanuc servo motors can be reused.
The types are early Red cap servo motors.
A06B-0516-B074#7000 on the Z-axe, torque=5,9 Nm, 4,1Amp, 3 phase, 8 poles, 1500 rpm, excit perm magnet, 138 Volt.
A06B-0515-B074#7000 on the X-axe, torque=2,8 Nm, 2,6Amp, 3 phase, 8 poles, 1500 rpm, excit perm magnet, 113 Volt.
Those motors are not in the table of the installation manual.
Can this motors be used or do i have to use other types?
The DIOCAP DC supply to the ACDC 30 servo drivers, give a 350 V DC to the ACDC30 drivers, is this not to high according the manual it should be 300V max. The DIOCAP is connected on a 230 Volt 50 Hz supply, comming from a transfo. I have the possibility to connect the DIOCAP on a 110 Volt 50 Hz supply if this is needed.
I see on the OAK board that the 7 segment LED a 3, is this ok? I cannot find the meaning of this "3", is there someware a table available with the code that can be read on this 7 segment led?
Thx in advance.
Best regards,
Cis

[cncsnw]

The "3" on the Oak LED means that the Oak on-board axis interface (which you are probably not using) begins with drive #3, presumably because you have two ACDC-30 drives connected to drive communication cables. Those drives become drives #1 and #2 (as indicated on their LEDs), bumping the Oak up to #3.

This is only relevant if you connect additional axis drives to the Oak axis headers.

[eng199]

I think A06B-0516-B074#7000 is a 5S motor, but with a rare configuration of 1500 RPM instead of 2000 RPM. You could probably get this one working.

A06B-0515-B074#7000 is too small for AC/DC. Turning AC/DC-30 current down that low will reduce current sensor resolution too much to recommend.

[cis]

I gone try to use the "small" fanuc servo A06B-0515-B074#7000, but there is a problem.
The lathe have 2 axes,with the fanuc servo motors with both a 40.000 counts/rev encoder supplied by Centroid.The spindel have a 8000 counts/rev, also supplied by Centroid. A wireless MPG is set with parameter 411 on 1. After wiring, the commutation of both servo motors, and the spindle test where all ok. By cleaning up afterwarts the electrical cabinet, possible a connection became loose, or i have changed somewhere a parameter. Now the servo motors cannot be jogged manualy, spindle,is not running. I made a report, can a someone help to see wath en where the problem is located and how the sole this to get the lathe running?
Thx.

[cncsnw]

Assuming your axis encoders are wired to the ACDC drives, I think you need to have Machine Parameters 308 and 309 set to 7 and 8 respectively.

Even though the ACDC drives are inserted as drives #1 and #2, the encoder input numbers do not change: encoders #1 - #4 are on the Oak axis headers; encoders #5 and #6 are the Oak 9-pin D-sub headers; and encoders #7 and up are the DriveBus devices (such as the ACDC drives).

[cncsnw]

You will also want to set P218 = 3, so that your wireless MPG will control both axis #1 (Z) and axis #2 (X).

[eng199]

The drive current is set too high. Current should not be set more than 3 times constant stall current for brushless motors.

Do not go higher than the following:
4.1A motor, current setting 41%
2.6A motor, current setting 26%

Small motors can heat up fast and fail. AC/DC can quickly turn a 2.6A motor into a smoking pile of scrap if not tuned correctly (trust me on this one ). This is one reason that motors under about 3-4A are not recommended. Tuning a small motor without a good set of tuning parameters to start from is risky. Setting the current way too high will almost guarantee premature failure.

[cis]

Parameters have been changed, P218 to 3, P308 to 7, P309 to 8, current settings for the servo motors: 41% Z-axe and 26% for X-axe, but servo motors cannot be jogged, home cannot be set.
I made a fresh report with this new settings.
When i toggle the E-stop, the led change from green to red, releasing the E-stop the led change from red to green, so E-stop should work.
All the fuses on the Oak board are ok.The 7 segment led on the Oak board is showing a "3".
How can the problem be solved?
Thx.
Cis

[cncsnw]

Your message log includes, at each startup, messages like:

Code: Select all

(1)   09-01-2021 15:12:25 407 Z- limit (#50001) tripped
(1)   09-01-2021 15:12:25 407 X- limit (#50003) tripped

Do you have limit switches wired to INP1 and INP3?

You seem to have all of the first eight inputs inverted, to make open switches appear closed. Are your limit switches normally-open, or normally-closed?

Your message log also includes, periodically:

Code: Select all

... 410 X axis(2) position error

That is a little puzzling, since with two tripped limits (Z- and X- as shown above) CNC12 should not allow you to attempt homing or jogging any axis. Were you trying to move the X axis with the MPG handwheel at that point?

[cis]

There are no limit switches connected on the Oak-board, the idea is to use soft limit switches. When using the soft limit switches, must the Oak-board be wired with a "closed" switch, switch replaced by a wire?
Can the E-stop contactor the reason why the servo motors cannot be jogged, when the contactor is not switching, the servo motors have no supply, no tension. A MPG cable is not connected on the Oak-board, must a parameter set for not using a MPG, a wireless WMPG is connected with USB antenna.
Parameter P218 for WMPG is set on 3.