Honeywell UDC2500 ユーザーズマニュアル

At the end of the tuning process, the controller immediately calculates the tuning 
constants and enters them into the Tuning group, and begins PID control with the correct 
tuning parameters.  This works with any process, including integrating type processes, 
and allows retuning at a fixed setpoint. 

After “TUNE” has been enabled, you can start Accutune as shown in Table 4-11.   

Step 

Configure LSP1 

 

Until SP (Local Setpoint 1) shows 
in the lower display. 

 

or

 

Until LSP1 is to the desired value. 

Switch to 
“Automatic” Mode 

 

Until the “A” indicator is lighted (on 
controllers with Manual option). 

Show Tuning 
Prompt 

 

Until “NoTUNE” is shown on lower 
display. 

Initiate Tuning 

 

Select “DoSLOW” or “DoFAST” in 
lower display. 

Tuning in operation 

 

Upper display will flash “TUNE” as 
long as ACCUTUNE process is 
operating.  When process 
completes, tuning parameters are 
calculated and lower display will 
show “NoTune” prompt. 

 

ATTENTION 

The Accutune process may be aborted at any time by changing the lower display back to “NoTUNE” or 
by switching the controller into Manual Mode. 

 

Accutune for applications using Duplex (Heat/Cool) control. 

The controller must be configured to have two local setpoints unless Blended Tuning is 
desired (see below). See Subsection 3.11- Control Set Up Group for details on 
configuring two local setpoints. During tuning, the Accutune III process assumes that 
Local Setpoint 1 will cause a Heating demand (output above 50%), and the tuning 
parameters calculated for that setpoint are automatically entered as PID SET 1. Likewise, 
Accutune III assumes that Local Setpoint 2 will cause a Cooling demand (output less 
than 50%), and the tuning parameters calculated for that setpoint are automatically 
entered as PID SET 2.