Re: [CAD_CAM_EDM_DRO] Aerotech Motors with WorldServo Drives

Hi Mark,

Have you tried calling World Servo? They might be your best source of
help, if no-one here responds. To begin with, I would reduce your Kp
and Kv values and Ki can be set to zero to begin with. What are the
maximum values? (Maybe32,768?) Try something more in the 1000 - 5000
range. If you browse the Galil website - specifically:
http://www.galilmc.com/support/appnotes/optima/note3413.pdf you'll get
a better idea about the relationship between P,I & D and how to tune a
servo system. Gecko's and Rutex's websites also have some tuning info
pertaining to their drives, but it still is helpful.

Does the motor make any noise? If you try and move the motor shaft
(when the drive is powered up) does it resist your effort? Are you
absolutely sure your software is putting out step (and direction)
commands? These are big motors - what machine are you installing them
on? FYI, it appears you'll only get about 1000 rpm at 60 volts based on
the 60V/krpm and the drive is limited to 75V.

Cheers, Peter

mark_aka_nat wrote:

>I have been working, for some time now, on a CNC mill conversion and
>am in the final stages. I'm in desperate need of help. I
>can't get the servo drives to operate the motors correctly.
>Specifically, I'm having problems configuring the servo drives to
>match the motor specifications. I am at a dead end and would
>GREATLY appreciate any guidance, I would even pay for it.
>
>Specifics:
>I am using www.WorldServo.com SSt-1500 drives. These drives
>receive step/dir inputs and drive brushless servo motors with
>encoder feedback. They have software for the drives for
>configuration at http://www.worldservo.com/html/lvp.htm .
>
>I am using Aerotech BM800 brushless servo motors. The specs for the
>motors are at http://www.aerotech.com/products/motors/bmspecs.html
>
>I have double checked all my wiring as follows:
>
>BM800 SSt1500
>Phase A Motor-R
>Phase B Motor-S
>Phase C Motor-T
>Ground Motor shield
>Cosine A
>Cosine-N A --
>Sine B
>Sine-N B --
>Marker I
>Marker-N I --
>Common Gnd
>+5v +5v out
>Shield Gnd
>Hall effect A Comm R
>Hall effect B Comm S
>Hall effect C Comm T
>
>In the WorldServo software "cntl-shift-M" I currently have
>the
>following inputted:
>Resistance ohms 1.2
>Winding Constant ms 3.16
>Back EMF ke 62
>Vector Ref Offset 21
>Kip 12000
>Kii 1200
>
>For compensator tuning I'm using
>Kv 20000
>Kp 10000
>Ki 100
>
>Is anyone familiar with both of these products to provide some clues
>as to what could be wrong? Thanks a ton for any help.
>
>Mark
>
>
>
>
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