controller cannot respond very well to changing conditions or noise in the sys-
tem. If the proportional band is too narrow the temperature may swing back
and forth because the controller overreacts to temperature variations. For best
control stability the proportional band must be set for the optimum width.
The proportional bandwidth is set at the factory. Check your Report of Test to
verify factory settings. The proportional band width may be altered if the user
desires to optimize the control characteristics for a particular application.
The proportional bandwidth is easily adjusted from the front panel. The width
may be set to discrete values in degrees C or F depending on the selected units.
The proportional band adjustment is accessed within the secondary menu. Press
“SET” and “EXIT” to enter the secondary menu and show the heater power.
Then press “SET” to access the proportional band.
S+E
Access heater power in secondary menu
12 Pct
Heater power in percent
S
Access proportional band
Pb= 4.01C
Proportional band setting
To change the proportional band press “UP” or “DOWN”.
Pb=10.00C
New proportional band setting
To accept the new setting and access the cut-out set-point press “SET”.
Pressing “EXIT”, exits the secondary menu ignoring any changes just made to
the proportional band value.
31
6 Controller Operation
Proportional Band
Figure 7.
Proportional Band Settings
