User guide

Function
4-18 l Operation
Control Function Descriptions(continued)
Screen
SCREEN 40
and
SCREEN 41
SCREEN 37
SCREEN 42
SCREEN 43
REGEN PROP BAND
HEAT/COOL 30°F
REGEN POWER LIMIT
LOW 2% HIGH 80%
REGEN CYCLE TIME
HEAT 2.0 SECONDS
Before performing an autotune, set the
setpoint to the desired temperature you
would like the control to autotune to at
screen 3 for process, and screen 4 for
regeneration. Screen 40 shows the auto-
tune function for the selected heater. The
dryer must not be running to initiate an
autotune. The autotune should be started
from a cold start or a minimum of 50ºF
{28ºC} difference between starting and
autotune temperatures. With the proper
password, (see page 4-29, screen 85) press
the Select Category button under the word
Off. Once selected, the word should start
to blink. Press the (+) or (-) button to tog-
gle the Off to On and then press the
“ENTER” key to start the autotune. The
display will show " Wait", then "Heat",
then " Done" when it is complete. Pressing
“STOP” during an autotune will cancel
the autotune and not change PID values.
The PID values can be set back to factory
defaults by going to the Reset (screen 46).
This screen shows the power output range
for the heater. It is set by default to 0%
for the low and 100% for the high.
This screen shows the PID cycle time for
the heater "Heat", or with a precooler
"Cool". This time value is the time for one
on/off cycle. For example, with a heater
running at 50% and the cycle time set at
2 seconds, the heater would be on 1
second and off 1 second.
This screen shows the Proportional Band
value for the PID loop.
PROCESS PID DONE
AUTOTUNE OFF
REGEN PID DONE
AUTO