(Episode VI) The return of BAUMULLER

[Maque Guailleveur]

We have a Man-Roland press system with Baumuller virtual axis drive.

The press machine has been provided with :
- BUM 62-75/130 : mono power unit (+ BUS 6E)
- controlled by DSP-MAR : DSP multiple axis controller
- supervised by DSP-SDC : Sync drive controller
...

and we have an E**N**O**R**M**O**U**S P**R**O**B**L**E**M !!!

One by one, the output power stage of the BUM explodes !!

All the times, the machine is not running or is stopping !!
Even on a printing group stopped for a long time (several hours) !!

All the external braking resistors are correctly connected.

We want know if other compagnies have the same problem.

If you often see smoke, fire, light of Jedi's saber or smell burn
near the electrical closet, feel free to contact me.

Regards.
Maque Guailleveur.

-- May the Force be with you Luke --
-- No, my name is Maque Guailleveur --

 

[Winfield Hill]

Maque Guailleveur wrote...

We have a Man-Roland press system with Baumuller virtual axis drive.
- BUM 62-75/130 : mono power unit (+ BUS 6E)
One by one, the output power stage of the BUM explodes !!
... All the times, the machine is not running or is stopping !!
Even on a printing group stopped for a long time (several hours) !!

Check your AC line power quility, check all the phases, etc.
Do a failure postmortem.

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)

 

[Maque Guailleveur]

Thanks Win,

The AC line power quality seems to be good (inside Baumüller specifications).
We have overvoltage protection on all the phases (good enough for the drive).
We have lots of inverter on the line and any of them complain.

The output transistors seem to be well sized for the application and can
endure more power than they take.

We think the problem comes from premature wear of electronic components ...

Best regards.
Maque Guailleveur.

 

[Winfield Hill]

Maque Guailleveur wrote...

We think the problem comes from premature wear of electronic components ...

Since electronic components don't have any moving parts, that's a
concept we don't often see. What we do see is overstressed parts,
which can generally be traced to specific causes. But first it's
necessary to do a failure analysis: Exactly what failed, and if
multiple items, what failed first causing the other items to fail?
Keep in mind the designer and manufacturer will have already made
sure that no part is ever overstressed during normal operation.

One failure mode not covered is defective parts. But if this is
your problem, the company will no doubt have already seen multiple
failure instances, so give them a call.

Thanks,
- Win

(email: use hill_at_rowland-dot-org for now)

 

[Maque Guailleveur]

I don't have seen any moving parts inside the drive, neither gears nor
mechanism inside the drive.

Seriously, only output transistors failed (the big black box near the
metal thingumajig called dissipator).

Of course the manufacturer knows the problem, and only repairs our
drive and receives (a lot of) money in exchange ...

Only the oldest drives failed, not those that have been repaired.

We DO NOT WANT a solution to our problem, we just want to know if
others compagnies have the same problem.

Thanks for your posts.
- Maque.

 

[Maque Guailleveur]

What do you mean by transformer ? What's that ? Voltage ?
Too many wires enter into the drive (some green, some blue, some black).

Seriously, we DO NOT WANT a solution to our problem, we just want know
if other compagnies have the same problem.

Thanks for your post.
- Maque.

 

[John Fields]

I don't have seen any moving parts inside the drive, neither gears nor
mechanism inside the drive.

Seriously, only output transistors failed (the big black box near the
metal thingumajig called dissipator).

Of course the manufacturer knows the problem, and only repairs our
drive and receives (a lot of) money in exchange ...

Only the oldest drives failed, not those that have been repaired.

We DO NOT WANT a solution to our problem, we just want to know if
others compagnies have the same problem.

 

[Maque Guailleveur]

Why not ?

 

[John Fields]

Why not ?

 

[Maque Guailleveur]

I can't detect any sign of humour ...

--- CUT HERE ---
public class JohnFields
{
public JohnFields( ) {
// Does nothing
}

public final static boolean hasHumour(
boolean inAllCircumstances )
{
// Definitively false
return false;
}

public static void main( String[] argv )
{
JohnFields jf = new JohnFields( );
// Tell the garbage collector to do his job
jf.dispose( );
}

}
--- CUT HERE ---

 

[John Fields]

I can't detect any sign of humour ...

---
None was intended, so you may consider your non-humor detector
operational.

However, your "style" seems to be trollish and confrontational, so
your humor detector may well be impaired.