Honeywell 900 User Manual page 165

Item
Accutune Status
Revision 9
May 2014
ACCUTUNE III Status and Error prompts:
NOT READY - This is shown:
- When the control mode is Manual.
- For a Setpoint Tune when the difference between the PV and Setpoint is
greater than 3%.
- When a Setpoint Tune is initiated and the PV is determined, by the adaptive
logic to not have enough "historical data", or the PV is moving too much to begin a
Setpoint Tune. Either of these conditions will result in the Not Ready status and the
Setpoint Tune algorithm will then wait until the PV is determined to be ready for the
Setpoint Tune to begin.
READY - Indicates that the PV is at lineout in regards to the Setpoint. Lineout occurs
when the PV is within 0.2% of the Setpoint value.
TUNE RUNNING - Accutune lll process still active.
ID FAILURE - SP Tune failed to properly identify the process. This usually occurs
when SP Tune is initiated with a process that is moving. Retry the SP Tune making
sure that the process is stable and not moving in any direction.
SP ERROR - For Cycle Tuning this occurs for Duplex, Manual Tuning when the SP
value is not in the proper range. For cool side tuning the SP must be less than 48%
and for heat side tuning the SP must be greater then 52% of the PV range. For SP
Tune this error condition occurs if the deviation between the PV and SP is greater
than 3% of the PV range when SP Tune is initiated. Retry the SP Tune after
adjusting the deviation to be less than 3%.
GAIN ERROR - This error condition occurs when the process gain value (Kpg) is not
within the range of 0.10 to 10. Adjust this value to 1.00 and retry the SP Tune
making sure that the process is stable and not moving in any direction.
OUTPUT ERROR - For SP Tune this occurs when the initial output is not within the
configured output limits. Check the SP step direction and size to make sure they are
correct or modify the SP to use a value closer to the PV middle range.
PV ADT RUNNING - PV tuning is active monitoring the process.
ABORT - Current Accutune III process was aborted. An active Accutune III process
will be aborted is if the loop is placed in the Manual mode.
900 Control Station User Guide
Description
Loops
Loop Setup
153