Chemglass CG-15001 Series - Manual (Page 5)

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6. Press the  until “tunE” is shown on the display.
7. Press and hold the  key and “tunE” will change to “off” to indicate that the autotune is currently off.
8. While holding in the  key, press the  key to change the display to read “on”, and then release both keys.
9. Press and hold the  and  keys until the measured temperature appears on the display. The Controller is now in
Autotune Mode. While in autotune the display alternates between “tunE” and the process temperature. When the
autotune process is complete, which may take in excess of an hour, the Controller will only display the process
temperature. The autotune procedure can be stopped at any time by repeating steps 3, 8, and 9
– except in step 8 press
the  key until “off” is displayed. NOTE: If “tunE” and “FAiL” alternate on the display, then the Autotune process has
failed. See trouble shooting notes.
During autotune the controller heats to 75% of the set
point temperature, where it oscillates for several cycles
before loading the new tuning parameters. After the
tuning parameters are loaded it heats to the set point
temperature. Tuning below the set point prevents any
damage that might occur from overheating.
During T1 – T4, the Controller measures rates of heating and cooling, as well as heating delays to
determine tuning values.
Set point
Time
Temp
Start
New tuning values loaded into memory
75% of
set point
T1
e
m
p T2
e
m
p T3
e
m
p T4
e
m
p