Honeywell UDC2500 ユーザーズマニュアル

Tuning consists of establishing the appropriate values for the tuning constants you are 
using so that your controller responds correctly to changes in process variable and 
setpoint. You can start with predetermined values but you will have to watch the system 
to see how to modify them. The Accutune feature automatically selects Gain, Rate, and 
Reset on demand. 

ATTENTION 

Because this group contains functions that have to do with security and lockout, we recommend 
that you configure this group last, after all other configuration data has been loaded. 

Lower Display 

Upper Display 

PB = 0.1 to 1000 %
Gain = 0.01 to 
1000 

       

PROPORTIONAL BAND (simplex) is the 
percent of the range of the measured 
variable for which a proportional controller 
will produce a 100 % change in its output. 

GAIN is the ratio of output change (%) over 
the measured variable change (%) that 
caused it. 

 G 

= 

100%

PB%

  

where PB is the proportional band (in %) 

If the PB is 20 %, then the Gain is 5. And, at 
those settings, a 3 % change in the error 
signal (SP-PV) will result in a 15 % change in 
the controller's output due to proportional 
action. If the Gain is 2, then the PB is 50 %. 

Also defined as "HEAT" Gain on Duplex 
models for variations of Heat/Cool 
applications. 

The selection of Proportional Band or Gain is 
made in the CONTROL parameter group 
under prompt PBorGAIN. 

0.00 to 10.00 
minutes 
0.08 or less = OFF 

 

RATE action, in minutes, affects the 
controller's output whenever the deviation is 
changing; and affects it more when the 
deviation is changing faster.