Eleceng1996

Hello Siemens community,

We are having intermittent F011 faults on a Masterdrives AFE unit. This is controlled under cos(phi) to regulate bus volts and PF. We found r949 = 2, what does this mean in context of F011 fault? From our PDA system, we do not see high current to explain this fault and the drives connected to this AFE are not changing dynamically enough to explain the increase and resultant F011 fault. The AFE is rated for over 3000A, but we get nowhere near there...however the sampling time of our data acquisition is 50ms, so we are not seeing the complete picture. We have replaced the CUSA card because faults were not being stored in memory however these faults still persist. We used the simovert testbox and verified IGBTs, PSU board, IVI, IGD and CTs were found OK (voltage offset was between -50mV and 0V at 0 current). I am thinking to swap our the VSB board to see if it helps, and maybe look at the clean power filter? Any other ideas are appreciated. I have attached PDA of incoming AC rms volts, DC bus volts and DC link current.

Thank you

Attachment

Masterdrives AFE F011.png(183 Downloads)

Cannot seem to resolve this fault.

Fault occurs randomly once a day, but only for a brief moment, then reset fault, crane off and on and carry on with production.

Hoist is always used when fault occurs, but sometime with hoist and trolley.

Swapped out VSB & -G10 (24V power supply), tested IR, not sure about current drawn when fault occurs, but it never seem to exceed the max the AFE is set up for.

Would like to swap out CUSA, but not sure of the procedure and possible complications.

Some parameters in DriveMon shows "Code word missing", "Parameter deactivated" - not sure if that is normal or something wrong?

Where are the CT's located for me to test them?

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Split from Masterdrives AFE F011 (overcurrent).