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Parker 890 drive HOT fault.

We have 3 Parker 890 drives (Model: 890SD-532450D0-B00-1A000) installed in one of our machines. Every year at least one of these three drives fail with HOT fault. The fault doesn't get reset even if the drive is in off condition for months. Once the drive fails with HOT fault, the heat sink temperature in drive's display starts showing constant 125°C, even if the ambient temperature of the panel remains between 28-32°C and there is enough gap between all three drives. 

For repairing the drive we replaced old PCB (AH500819U001/1   AH500819T011/1) by installing newly purchased PCB (AH500819U001 04). But after installing new PCB the drive starts tripping with fault "INCOMPATIBLE STO TEST RECORD".

Please suggest why our drives are regularly failing with "HOT" fault. And also suggest the part no. of spares or PCBs to be replaced in order to repair the drive.

Parents Reply
  • Hello electrical

    No, the STO fault cannot be cleared in the field.  The unit would need to come in on an RMA set up through a local Parker store or distributor.  I truly do not know how that might be in Oman as that isn't a region we would sell/service directly.  There will be Parker locations there that can assist you in that.

    Regarding the HOT fault, only other question is whether these previous failures were always on a particular 'axis' amongst the three, even if multiple drives have failed over time, where they always installed in the same physical location? 

    We are assuming the temperature in that enclosure is always well regulated but in theory there could be times when the air conditioning has failed or is simply not adequate to keep the internal enclosure ambient temperatures within the product operation specs.  Measuring the internal enclosure temperature during normal operating conditions on a hot day would be a good thing to verify.  Won't tell you if the AC has failed at times but at least we know that normally it is within spec, instead of just assuming so because it has an AC system.

    Your description also implies you have down repairs in the past.  That is a little confusing as these repair boards are not items we sell directly.  Where/how have you been sourcing the replacement boards?  

    Finally, if you have been tearing down the drives to replace boards and any of the internal thermal bonds between the bridge and the heatsink was broken, there is very good likelihood that this bond isn't to factory spec unless the repair technician added thermal compound when it was being rebuilt.  This could results in the IGBT device running much hotter than it should as it can't dissipate its heat energy into the heatsink as efficiently as it should, regardless of the ambient temp.  That could lead to short term HOT faults and then eventually a hard failure (in theory).