Rockwell Automation AADvance Controller Troubleshooting and Maintenance Manual - Manual (Page 11)

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Document: 553634
(ICSTT-RM406F_EN_P) Issue: 089:
1-1
Corrective maintenance activities for the AADvance controller embrace troubleshooting activities and
the subsequent remedial work to rectify the problem and return the controller to normal operation. In
addition, some preventive testing and maintenance should be done to make sure the system is available
and healthy.
In This Chapter
Making Repairs Promptly .................................................................................. 1-1
Resolving Multiple Faults ................................................................................... 1-1
Required Tools Standard AADvance ............................................................. 1-2
Required Test Equipment ................................................................................. 1-2
Return a Module ................................................................................................. 1-3
Conventions Used in Flow Charts ................................................................. 1-3
Making Repairs Promptly
A fault indication does not necessarily mean a vital part of the controller is not operational. Some faults
have no immediate consequence — for example, the fault may be within one of the diagnostic systems.
Nevertheless, the problem should still be rectified in a timely manner.
System repair must be done promptly, to ensure faults do not accumulate. This principle applies as
much to a redundant arrangement, which needs to ensure continued fault-tolerant operation, as to a
simplex controller. Multiple failures can cause a plant shutdown.
SAFETY
Never allow an AADvance controller used for a safety-critical function to
operate for an extended period with a failed module. Replace the module within
the MTTR assumed for PFD calculations to preserve the SIL level for the
system. For PFD & PFH data refer to Doc No. 553847 PFH avg and PFD avg
Data
Resolving Multiple Faults
The fault diagnosis procedures described in this manual will locate and resolve a single fault. If you
follow one of the processes to its conclusion but a fault indication persists, one or more additional
faults remain. Quarantine any defective items you have removed during your first investigation, then
start again at the beginning of the appropriate procedure.
Chapter 1
Introduction to Maintenance Activities