Need help wiring up servo Bridgeport Interact II

[Shanghyd]

I burned up a driver board and recently purchased another. Prior to the driver board burning up I was getting a gross position error on the z axis. I removed the z axis motor and cleaned out the carbon, checked the brushes and did a physical inspection of the armature. Everything looked good so I put it back together. It ran for a while then burned up the board.

So now I've installed the new driver board and want to verify the wiring to the servo. I took the cover off another servo but the numbers are different.
If someone can provide a schematic for the z axis servo wiring at the motor I would really appreciate it. I tried the Heidenhain site and couldnt find what I needed.
I don't want to power up the machine until I'm sure of the wiring.

[Al_The_Man]

Is this a DC servo?, About the only way you would destroy a drive is through the armature.
If DC, try it on a automotive battery, both directions and also test for ground on the armature connection.
Al.

[Shanghyd]

I haven't had a chance to test the servo with a battery but wanted to describe a few more symptoms that I noticed.
This board is doing the same thing as the last one that burned up.
When the z axis retracts the transformer will rattle and hum loudly. Its only on the upstroke of the z axis that the transformer rattles. When I jog the z axis there is a definite difference in the speeds. Down is slow. Up is smoking fast. I noticed that when I was running a pecking cycle the z would retract very fast. I thought that it was because the up movement was rapid and the down movement was at the feedrate.

The x and y jog at the same rate in either direction

[machintek]

The JOG joy stick will move down slower and up faster. It is for your safety.
But rapid moves commanded in a program should be the same speed up or down.

George

[Shanghyd]

I've attached a wiring schematic.
I swapped out L2 and L3. No difference.
Where should I take measurements to do my tests? I suspect its the servo.


Edit: I think I need to tune the servo to the board. My maint. manual has instructions so I'm going to try that first.

[Shanghyd]

I pulled the servo motor off. Its a MT30R4-58.
I have 3.8 M Ohms between the motor terminals and the housing. I measured each seperately.
I put the meter leads in the motor terminal blocks and spun the shaft by hand. I got some output that was relative the the speed of the shaft.

[Shanghyd]

That last post of mine was all wrong. Here's the latest.

The X and Z axis are Controlled Motor Technologies (CMT) servos.
The Y axis is a SEM servo. The specs are:

CMT:
140V 37amps

SEM 145V 32amps.

I should be getting a resistance reading of 4.53 on the SEM motor and 3.78 on the CMT servos right?

My readings are:
SEM = 3.3
CMT = 2.0 (both are exactly the same)

The resistance readings are off according to an Ohms law calculator I found on the internet.

Any ideas about how to solve the issue or what could be causing the low resistance readings?

[Al_The_Man]

Very hard to measure the armature resistance using a meter, the accurate way is to apply a low voltage with a locked rotor and measure the current.
Brush resistance and brush contact have an effect on a ohm meter reading.
Did you tune the drives?
Al.

[Shanghyd]

I tuned the drive following the procedure in the manual. It was pretty straight forward.