C300 operating behaviors
C300 Controller overload conditions
186 Experion C300 Controller User's Guide R301.1
Honeywell 11/06
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
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
CPUFREE and the alarms that signaled the overload.
• When the alarms indicating overload have ‘returned-to-normal’ and CPUFREE has
reached 5%, delete the CMs selected for deletion
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