Homing Problem After Reinstalling Servo

[Productos]

Hi,
I have a Bridgeport Interact 1 with a Heidenhain 151 Control. The Y axis servo burned and I had it sent out and repaired. After reinstalling the motor the axis will move, but will not go home correctly when starting up the machine. While going to the Y axis reference point it appears to have gone to the correct point, but the message remains on the screen and the machine freezes.
Is there an adjustment procedure for reinstalling the servo?
If anyone have a suggestion please help I need the machine up.

Thanks,
Peter

[RMARCH]

When you remove a motor you should measure how far the pulley is mounted on the motor shaft so when you replace it you can put it back near the correct spot. I would try moving the pulley a little so when you home the machine it hits the home limit switch.

[machintek]

See if this helps.

George

[gridley51]

I can email you the pages from the manual if you send me your email address.
The software limits have to be reset after the servo has been reinstalled.
Mark.

[gus]

Yeah, possible I suppose that the settings on the servo amp are so off that it is never ever actually getting to the endpoint, but seems slim.

Is it moving smoothly, normally when referencing?

AFAIK all it does while homing is put out x.x volts + - [depending on parameter] and the control will I believe look at the encoder pulses to make sure they are there[IOW you can get an encoder error while homing] but it doesn't look for the home pulse until it hits the trip dog. Now maybe if it hit the trip dog and saw the home pulse at the same time it would freak it out.

[gridley51]

After replacing an axis motor the soft limits in the parameters have to be reset.I have emailed him the relevant pages from the manual.
Mark.

[Dirky]

Originally Posted by machintek See if this helps. George

George.I just read this...you sent this info to someone having trouble getting thier axis' to home correctly......should I need to do this....what behavior would I look for to determine if my machine requires this procedure ?

[Productos]

Thanks for the replys and suggestions.
Unfortunately I don't think I have enough electronic knowledge to attempt the instructions George sent me, and the instructions I received from Mark assumes that I can do the "pass over reference point" sequence. However that is where I get stuck. While referencing the Y-axis it just runs by the first linit switch, and hits the extreme limit switch, and then I'm stuck again. I tried to rotate the pulley 180 degrees, but that had no effect. I checked the linit switch with an ohm meter and it appears fine.
Any more ideas?

Peter

[Productos]

I just switched the X and Y-axis boards, but the problem remains the same. I assume that at least means that the problem is not in the boards?

[gus]

>>>While referencing the Y-axis it just runs by the first linit switch, and hits the extreme limit switch, and then I'm stuck again. I tried to rotate the pulley 180 degrees, but that had no effect. I checked the linit switch with an ohm meter and it appears fine.<<<

That is new information

It should stop dead when it hits the trip dog[ the first switch is not a limit switch] My first instinct with that symptom would be that the trip dog is not tripping. Assuming all the parameters are known good[ this machine ran for you before this happened] that is the first thing to double check

[machintek]

It may not be seeing the marker pulse. Swap motors.

The drive tuning procedure is just that. Every so often due to use, age and heat the values of electrical components can change as well as the brushes wearing and the magnets decaying in the motors. This may require some adjustment. replacing a motor or a servo drive board may require this procedure also.

George

[Productos]

Thanks gus,
Part of the problem I guess is I'm dumber than a doorknob when it comes to electronics and machine repair. Therefore I probably have not explained the problem correctly yet and my vocabulary must most certainly be off.
As far as the parameters being good - yes and no. The previous owner (I've had the machine for about 8 months) changed batteries with the power off as I was in the process of buying it. (He did not have a manual, nor the parameters). I was able to download a set of parameters from the internet, and lo and behold the machine has been working since. I'm sure that there are errors in backlash and such, but it worked fine for what I need it for, so I did not want to mess with anything.
I did check the switch (limit and "trip dog") with an ohm meter as I mentioned, and it seems to work correctly.
If you are familiar with this particular type of control and machine, you know that when doing the pass over reference sequence, if the machine is already at the reference point, the text on the screen is black with yellow background, and it first backs off then returns. If it is away from the ref point the text is normal, yellow on black. I backed all axis (by turning the belts) from the switches and then pushed the trip dog switch by hand. All of them including Y then gave me the black text with yellow background, so some sort of signal is being sent out. However when I try to do the homing the result is the same. The Z axis is fine and the Y-axis blows right by the trip dog, and I'm stuck.
Is there a way that a layman like myself can check the trip dog out, or do I need to find someone that knows what they are doing?