adccommunitymod (AutomationDirect) asked a question.
Created Date: March 20,2006
Created By: davestr1
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I have a bunch of (50+) web handling machines worldwide that use DL06 plcs (D0-06DD1). In the last month, I have had a total of 4 machines mysteriously develop an E4** error and lose the program. A 5th machine had an E151 parity error. These are all 220v single phase power machines with a 220-120v control transformer with a grounded neutral. All were in different locations worldwide. The only common thread between the machines is they all have DL06's, and all have regen SCR DC drives on them as well.The drives are supplied by 220v incoming power. Of course, the reports from my customers in the field yield not much useful info, and none indicate any welding or power strikes have occurred recently. Any ideas? Anyone else losing programs?
Created Date: March 20,2006
Created by: Tech Guy
Do you have any surge protection on the PLC? I would initally suspect the regen drive as the culprit since powering it off will typically cause a large inductive spike in the power line.
It sounds like you would benefit by using a TVSS unit in this case. TVSS units range from about $60 on up into the thousands of dollars, but one such as the Cutler Hammer line that we carry should help considerably.
Created Date: March 20,2006
Created by: chris.zeman
I had the same thing occur on one of my DL-06's this past summer, and I have the Cutler-Hammer Powerline Filter installed. I figured it was just an odd occurance, as my others have been just fine.
Created Date: March 21,2006
Created by: Tech Guy
If the spike is large enough it can make it past even the best power filter. BUT, it's all the small spikes and transients that cause the damage and even a cheap $0.99 MOV will capture some of those. The better the power filter, the more power fluctuations it will capture.
Created Date: March 21,2006
Created by: davestr1
No filtering on the 120v input to the PLC.
220 thru control xformer to fuses to PLC.
I should point out we have this same machine in a 120v configuration, with identical DC drive jumpered for 120V, and no control transformer, with the machine plugged into the wall.
Curiously, we have had encountered no problems in this configuration.
Our other machines with Koyo plcs and line regen ac vector drives have not required PLC power filtering.
No issues in the field with these.
Created Date: March 21,2006
Created by: Tech Guy
Please note that I did not say that it was the Regen Drive, just that it was a likely culprit.
Running semiconductor devices such as PLCs without surge protection or filtering is sort of like playing the odds on running a red light at a empty intersection.
Most of the time you win and nothing is coming. Same thing with a voltage spike or transient.
Eventually you will loose and there is that compact car coming at you. This is when that voltage spike or transient wipes the memory. This is what the surge protection equipment should be able to stop.
Every blue moon, you loose big time and that huge bus is right in the windshield. This is when that spike or transient wipes the entire control cabinet. The surge protection is not likely to help in this cause, but it might help alleviate it.
Created Date: March 20,2006
Created by: davestr1
I have a bunch of (50+) web handling machines worldwide that use DL06 plcs (D0-06DD1).
In the last month, I have had a total of 4 machines mysteriously develop an E4** error and lose the program. A 5th machine had an E151 parity error. These are all 220v single phase power machines with a 220-120v control transformer with a grounded neutral. All were in different locations worldwide. The only common thread between the machines is they all have DL06's, and all have regen SCR DC drives on them as well.The drives are supplied by 220v incoming power.
Of course, the reports from my customers in the field yield not much useful info, and none indicate any welding or power strikes have occurred recently.
Any ideas?
Anyone else losing programs?