Honeywell Experion C300 User Manual page 202

C300 operating behaviors
C300 Controller overload conditions
Recovery from an overload
Recovery from an overload condition will require you to make changes in some
combination to the following areas:
Delete some of the loaded control strategy. That is, inactivate and/or delete some
•
number of Control Modules (CMs).
Change the execution period and/or phase of some selected CMs in order to decrease
•
the frequency at which the CMs must execute.
To carry out this recovery process, first consider:
Which of the loaded CMs to delete from the C300 Controller in order to recover
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from the overloaded state.
Prepare for the selective loss of control that will result as individual CMs are
−
placed in the Inactive state, and possibly deleted.
Then:
Begin by placing the least critical CMs in the Inactive state while monitoring
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CPUFREE and the alarms that signaled the overload.
When the alarms indicating overload have 'returned-to-normal' and CPUFREE has
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reached 5%, delete the CMs selected for deletion
186 Experion C300 Controller User's Guide
Honeywell
R301.1
11/06