Fanuc Servo Inquiry

[NC Cams]

I have a bunch of Fanuc DC servo's from model 5T lathe controllers. They are all Model O's or Model 5's as best I can determine.

I can see what sort of AC fuse is used on the imput to the drive but can't seem to find any specs on what sort of DC current that they pull - peak and/or relatively continuous. They seem to have a per phase AC input voltage to the drive of 105 vac.

I"m interested in using them on something else and am curious as to what sort of DC servo drive capabilities that I need to look for.

Also interested in any step/direction servo amp ideas as well as any analog (+/-10) drive ideas that y'all may have. I don't think Gecko makes anything capable of the DC input voltage that I'll need to protect for - probably 120 to 140vdc. I already have info on those available from AMC.

Thanks for any other help anyone can provide.

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[Al_The_Man]

The numbers I have for the DC motors continuous rated current is
00M ____4A
0M_____7A
5M_____9A
10M____12A
20M____18A
The drives for these are generally 3 phase 200v SCR full wave bridge, so the resultant maximum DC at this value will be around 150VDC.
Other figures can be obtained empirically by simple tests.
If a 1ft arm is attached to the shaft with a spring scale on the end, a gradual increase in DC voltage to the armature will give a meaningfull reading on the scale, If the current is measured, then the Kt (torque/amp constant) is obtained.
Ke can be considered equal to Kt.
Other reading like reading the current with a locked rotor with a small voltage will allow the Armature resistance to be obtained by monitoring current and voltage, less about .5v drop for brush resistance, do not use a resistance meter.
For inertia, you will have to calculate approximately from armature mass.
If a significant DC voltage is supplied to the armature and the RPM and voltage is recorded, the rpm/volt can be obtained by extrapolation.
I believe the maximum RPM for these motors is around 2000rpm.
A.

[NC Cams]

Thanks Al

Looks like a servo amp capable of 10 amps continuous with 20-25 peak would suffice if it had a voltage rating of 150-180 for the OOM or OM or even a 5M servo.

Hello AMC.

Anybody know of a step/direction input servo amp that has a 180 volt rating and 10 amps continuous/20-25 amp surge capability???? I already know were to get +/-10vdc analog amps.

Again, thanks