24VDC error on UR robot due to short in IO connections

Sebastien

Hi pros,
A connector connected to a sensor that is connected directly into our UR robot controller got pulled out. When it got damaged, we believe the connections may have shorten for a small amount of time. So we replaced the sensor and connections and when we tried to get back up and running we had an error saying that there was no 24VDC supplied to the safety board. After discussing this with some other people we ended up hooking an external 24VDC power supply to the IO power alimentation and now it works but we were told that we would need to replace the entire safety control board which is quite expensive. It just does not make sense to me that there is no fuse that can be replaced that are protecting the IOs. I am guessing since this is quite basic someone else ran into this problem. What did you guys ended up doing? Is UR replacing this under warranty?

In the futur we will definitively do some modifications to the controller to protect this but with the price we pay for the robots I would expect it to be better protected against IOs shortages. 

matthewd92

We've had IO shorts in the past and it didn't damage the robot, just caused the controller to fault. But I agree about protection, there should be a breaker to protect the system. 

Sebastien

@matthewd92
Do you remember the error that you were getting. Ours was C192A20 SPI Output Error detected.

Do you know how to fix this error?

matthewd92

As I believe the 24V being fed to the circuits is actually coming of the SCB I think the only thing you can do is replace the card, unfortunately the fuses that are on the board are not replaceable.  Since its a safety card I would not recommend changing the fuses even if you could unsolder them from the board.  You might want to check them though just to see if they are blown.  I would guess that they are not since external 24V is working.  More than likely its a blown buck converter that drops the 48V supply to 24V for consumption.

mbartczak

I am having the same error of C192A20.  Is replacing the SCB the only way to clear this error?  Other than adding an external power supply?

iremnurtokac

mbartczak said:

I am having the same error of C192A20.  Is replacing the SCB the only way to clear this error?  Other than adding an external power supply?

I am having the same problem. Did you find any other solution? 

pogenest

Hello mbartczak and iremnurtokac, 

This error is caused from the power terminal block.

There are, at least, 4 causes for this error.

The power terminal block is not being plugged in

The power terminal block is loose jumper cable (the screw are unscrewed)

The power terminal block is missing jumper cable
At least on 24V fuses is blown.

Jbruno

I am having the same error of C192A20  SPI output error detected. Can you shed any light to troubleshooting the 4 causes above to determine the Root cause. an image of the jumper cable required, where does it go.  The 24vdc safety circuit is all jumped out from Unicersal and none were removed.

matthewd92

This is from the user manual and is the jumper he’s referring to. 

Jbruno

So you must have the internal power supply jumped as show for the digital I/O .  The safety (yellow) block is all jumped from the factory already.  

matthewd92

The 24V power block should have been jumped from the factory as well but yes, you have to either provide an external 24V as shown in the lower image or jump the internal 24V to the IO as shown in the upper photo. 

Jbruno

Thank You!  someone must have removed the 2 jumper wire   this is the cause of why I am not getting 24vdc to the safety circuit.