Error SPS-BUS Roland 304

[Enis12]

I have been experiencing issues with these errors for quite some time. The current technicians are unable to identify the problem. When these errors occur, the machine comes to an abrupt stop; this has already caused the failure of the frequency drive (the device that regulates the speed of the drive motor) three times. Does anyone know what the problem might be?
Thanks.

 

[m.click]

Is the SPS BUS communication based on serial communication (RS485/RS422) or CAN bus or do you have fiber optics between magazines?

What do you mean frequency drive failure? Did you had to replace it or to reset the error that was stored in it?

 

[Enis12]

I don't understand what you mean exactly, here are pictures of the main computer under the counter.

We had to replace some parts. I was printing at a speed of 12,000 sheets/hour when it suddenly stopped and displayed "SPS-BUS" errors. I restarted the machine, which cleared all the errors, leaving no suspicious fault codes. However, when I tried to start the machine again, the first press triggered an audible signal, and the second press caused a phase-to-phase short circuit, blowing two 100A fuses. We then replaced the damaged components in the frequency drive (a thyristor, perhaps?), and the machine is now operating normally.

 

[m.click]

The drive power rectifier has blown thyristors because the SPS hangs up and the break engages suddenly, causing a violent halt in such a speed.
Looks like the loop that connects the magazines has loose contacts or is damaged.

 

[Enis12]

Due to a loss of commutation, the brake responded faster than the power converter, which resulted in the failure of the thyristors?

Can you help me solve the problem, which loop are you referring to exactly? if you mean the incoming 3-f and the outgoing +/- on the frequency itself are clamped?

 

[m.click]

The 304 is not kept the same throuh the years. Some general info is that the SPS master connects with all other SPS slave boards with the fiber optics loop. Is the loop in good condition? Not broken fibers or loose/dirty connectors?

 

[Enis12]

All the black boxes where the optical cable connects have been cleaned. As far as I know, the optical cable is not damaged anywhere. It’s unlikely that the interruption happens because I’m moving around the machine—that’s not something I’d suspect. The errors appear even when the machine is idle and I’m on a break. These errors pop up while the machine is stationary.

 

[drukman]

On this machine the SPS loop is not closed. SPS program not started. Close the loop first.

 

[Enis12]

If the machine runs for 2–3 hours or 2–3 days without any issues, and then suddenly throws these errors—how is it possible that the PLC loop is not closed? It is impossible to clear these errors in the standard way; however, power-cycling the machine (turning it off and back on) clears them, and it then operates normally for a certain period. If I am mistaken, please explain what I should do. Thank you.

 

[drukman]

The drive power rectifier has blown thyristors because the SPS hangs up and the break engages suddenly, causing a violent halt in such a speed.
Looks like the loop that connects the magazines has loose contacts or is damaged.

The R300 SPS communicates only via fiber optics. There is no direct connection (or communication) with the main motor power inverter.

 

[drukman]

When the machine stops, look for where this LED will light up. This LED is the SPS loop closed.

Visually check all optical fibers for equal light intensity. If any are darker, check the source or replace the cable. The cables are compatible with home audio/video optics.

 

[Enis12]

Is this a very unsolvable problem or did I not explain the problem well enough?

I tried manually (I don't know if I was allowed) to disconnect the optical thread from the black boxes to try to project the same errors. And I found where the errors appear, I replace the black boxes and the same thing again. Is it possible that the problem is in the green cards under the black box, that there is a problem in them when some component is heated

 

[Enis12]

When everything is normal, these LEDs light up. The yellow one flashes, and the red ones on the right are active. The image you sent, shows what happens when errors occur.

 

[drukman]

The black boxes in which the optics are connected are not the same. Pay attention to R8

 

[drukman]

.... Is it possible that the problem is in the green cards under the black box, that there is a problem in them when some component is heated

Loop must remain closed.

 

[Enis12]

If I had swapped them with the wrong ones, wouldn't it fail to work entirely? Because I swapped them with ones from above or below within the same cabinet.

 

[Enis12]

It is clear to me that the loop must remain closed. there are no Roland servis in Bosnia and Herzegovina, and nobody from Serbia knows what the problem could be.
I can't understand what can break the loop after 2-3 days of work

 

[drukman]

The machine is at least 20 years old. Weakened diodes, darkened optics. I already wrote: check all optical fibers for light strength.
Some help: