The proportional band width is easily adjusted from the controller front panel.
The width may be set to discrete values in degrees C or F depending on the se-
lected units. The optimum proportional band width setting may be determined
by monitoring the stability with a high resolution thermometer or with the con-
troller percent output power display. Narrow the proportional band width to the
point at which the process temperature begins to oscillate and then increase the
band width from this point to 3 or 4 times wider.
The proportional band adjustment may be 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
100.0 P
Heater power
S
Access proportional band
Prop
Flashes “
” and then
59.00
displays proportional band setting
To change the proportional band press “UP” or “DOWN”.
D
Decrement display
59.50
New proportional band setting
To accept the new setting and access configuration menu press “SET”. Pressing
“EXIT” will exit the secondary menu ignoring any changes just made to the
proportional band value.
Accept the new proportional band setting
7.9
Controller Configuration
The controller has a number of configuration and operating options and calibra-
tion parameters which are programmable via the front panel. These are ac-
cessed from the secondary menu after the proportional band by pressing
“SET”. The display will prompt with “
COnFIG
”. Press “SET” once more.
There are 3 sets of configuration parameters — calibration parameters, operat-
ing parameters, and serial interface parameters. The menus are selected using
the “UP” and “DOWN” keys and then pressing “SET”. See
Figure 5
.
29
7 Controller Operation
Controller Configuration
