PM891 Redundant Controller going to Fault mode
Recently we have observed that the secondary controller is just going to fault mode. If we try to initialize the controller ,at times it goes to normal operation but again after a few days it goes back to fault. In the past few days even after initialization it goes to fault mode immediately. We tried switching off power for both controllers and download, but during the download the secondary controller again goes to fault.
I also tried to power off the primary controller and download only to the secondary. The controller goes to online mode after the download but all the DO modules and some AO modules goes to fault.I also lost module bus communication with the last row of the module rack.
Right now it is working with just the Primary controller.
In another panel we had the problem of the controller continually switching between Primary and Secondary. One would go to fault and the second would become primary.Then immediately the secondary would go to fault and Primary would take over.In short it was continually oscillating. This resulted in full disturbance of the module bus and row by row modules would randomly go to channel error and then normalise after a few seconds disturbing the whole plant. Controller reset ,initialization, changing modbus cables made no difference. We started isolating some field signals and the oscillations stopped and we put the controllers back into operation. Again now after few weeks the secondary controller is again going to fault mode.
Kindly could you suggest what could be the reason.
I also tried to power off the primary controller and download only to the secondary. The controller goes to online mode after the download but all the DO modules and some AO modules goes to fault.I also lost module bus communication with the last row of the module rack.
Right now it is working with just the Primary controller.
In another panel we had the problem of the controller continually switching between Primary and Secondary. One would go to fault and the second would become primary.Then immediately the secondary would go to fault and Primary would take over.In short it was continually oscillating. This resulted in full disturbance of the module bus and row by row modules would randomly go to channel error and then normalise after a few seconds disturbing the whole plant. Controller reset ,initialization, changing modbus cables made no difference. We started isolating some field signals and the oscillations stopped and we put the controllers back into operation. Again now after few weeks the secondary controller is again going to fault mode.
Kindly could you suggest what could be the reason.
Asked 4 months ago
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1
Have you checked the controller logs? The fault reason should be output there... e.g. backup not able to see all I/O clusters.
Please consider filing a support case with your regional ABB support center to obtain professional assistance.
Use the AC800MFingerprint.exe installed below C:\Program Files (x86)\ABB\...\Control IT\AC800MFingerprint to collect log files, etc. The output is written to C:\ABB Industrial IT Data\Control IT Data\AC800MFingerprint\...). Hand over the fingerprint files when submitting the support case.
Please consider filing a support case with your regional ABB support center to obtain professional assistance.
Use the AC800MFingerprint.exe installed below C:\Program Files (x86)\ABB\...\Control IT\AC800MFingerprint to collect log files, etc. The output is written to C:\ABB Industrial IT Data\Control IT Data\AC800MFingerprint\...). Hand over the fingerprint files when submitting the support case.
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0
The first one seems like fault in one of the secondary TB840 or optical fiber from station to station.
Answered 4 months ago
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