Watlow Controls 8LS, User Manual

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44 8LS User’s Guide
Using the 8LS
If you have set the current loop to Manual control, this display appears
after you press
Enter :
• Press Yes to change the output power.
• Press Yes or No to select a new power output level.
• Press Enter to store your choice and go back to Single Loop display
Autotune
If you set the current loop control status to Tune and press Enter, the
controller automatically sets the loop to manual control, 100% output.
The autotune function then calculates the appropriate PID constants for
the loop and puts the loop in automatic control with the calculated PID
values.
The Autotune function will abort if:
• Process variable goes over 75% of the setpoint.
• PID constants were not calculated after 10 seconds (a failure of some
sort).
Ramp/Soak
Use the Ramp/Soak key only if the optional Ramp/soak package is
included in the controller. Information pertaining to programming and
operation of ramp and soak profiles is included in the Ramp/Soak
section.
1 2 3 4
5 6 7
8
LOOP PROCESS UNITS
ALARM SETPOINT STATUS OUTPUT%
6 SET MAN
OUT ? 0
H
T