Need Help!- DC Servo Vibrates on Fanuc 6M

[parametric.ms]

I have several problem with fanuc 6MB at Yamaguchi MC
1. when I move X axis to (-) direction it goes smooth. but if I move to opposite (+) direction, the servo vibrates so hard.
2. its happen to Z axis too with contrary case. when it goes up (+ direction) looks smooth. but if I move to minus direction, it just move a little then alarm comes up. (430 Z Servo)

I've compared whole parameter with Y axis with normal condition,but no luck. its still the same. Maybe I miss some parameter

What should I check to fix that problem?
Thanks in advance

PS : DC Servo Motor type 5M with VCU A20B-0009-0320

[parametric.ms]

where is Al The Man and Dan Fritz ? I need you here ASAP

I swap both servo and drive with Y axis but the problem still on X axis
I checked the DIAG 713 bit 4-5 works fine for Pulse coder

[3d GEORGE]

We had similar problem with our 6M Pratt & Whitney VMC machines. We discovered that if you can, remove the servo end cap. This should expose the servo encoder. Don't confuse with the encoder on the ball screw. Spray servo encoder with electronic cleaning spray available at Radio Shack or Best Buy. Cycle servo manually several times. Worked for us.

[greenery_fr]

Originally Posted by parametric.ms where is Al The Man and Dan Fritz ? I need you here ASAP I swap both servo and drive with Y axis but the problem still on X axis I checked the DIAG 713 bit 4-5 works fine for Pulse coder

First check +15 volt -15 volt and +5 volt on your Master PCB. If it Ok may be you had problem with master PCB. The main problem is in hybrid IC APC06

[parametric.ms]

Originally Posted by greenery_fr First check +15 volt -15 volt and +5 volt on your Master PCB. If it Ok may be you had problem with master PCB. The main problem is in hybrid IC APC06

Is it Freq to Voltage Converter IC? where is the location on master PCB?

[parametric.ms]

Originally Posted by 3d GEORGE We had similar problem with our 6M Pratt & Whitney VMC machines. We discovered that if you can, remove the servo end cap. This should expose the servo encoder. Don't confuse with the encoder on the ball screw. Spray servo encoder with electronic cleaning spray available at Radio Shack or Best Buy. Cycle servo manually several times. Worked for us.

Like I describe, seems look no problem with pulse coder. It works at minus direction smoothly. But I'll double check just for make sure

[mike-at-thorn]

On the older machines with DC motors, I found that in the case of vibration, cleaning the brushes and armature usually solved the problem. The brushes are located at 90 degree increments around the motor housing under rubber caps. Keep track of which hole the brushes came out of. Blow them off with clean dry compressed air and then clean the armature with a pencil eraser. If it's the problem, the eraser will come out black and sooty. Blow thru the brush holes with compressed air, but try not to breath the dust.

[ITT-Student]

This is an A06b-6047-hxxx servo drive correct? Are both servos identical?

[parametric.ms]

Originally Posted by ITT-Student This is an A06b-6047-hxxx servo drive correct? Are both servos identical?

3 axis are identical. A20B-0009-0320. I already swap whole unit (drive & motor) X to Y but had no luck still vibrating on X. I haven't swap with Z axis

[parametric.ms]

Originally Posted by mike-at-thorn On the older machines with DC motors, I found that in the case of vibration, cleaning the brushes and armature usually solved the problem. The brushes are located at 90 degree increments around the motor housing under rubber caps. Keep track of which hole the brushes came out of. Blow them off with clean dry compressed air and then clean the armature with a pencil eraser. If it's the problem, the eraser will come out black and sooty. Blow thru the brush holes with compressed air, but try not to breath the dust.

the 1st thing that I done was disassembled motor from ballscrew. checked the carbon brush, remove and clean armature from dust with clean dry compressed air.but nothing change even I swap the motor

[ITT-Student]

So the problem didn't move with the drives or motor? If this is the case then maybe you have some "noise" near the axis's or cabling? Do you have manuals on the fanuc 6?

[parametric.ms]

Originally Posted by ITT-Student So the problem didn't move with the drives or motor? If this is the case then maybe you have some "noise" near the axis's or cabling? Do you have manuals on the fanuc 6?

yes precisely... did you mean noise that affected to command signal? I have the manual doc with scan quality