12/22/14
6
Rev.5 (EC 02.293.435)
Control mode operation
Manual operation provides direct (time proportioned % time) control from -100% to 100%. A negative value is allowed
only when Ot 1=Cool. Automatic operation provides sensory feedback ON/OFF or PID control. When the operation
transfers from automatic to manual operation, the power level from automatic operation is retained and restored to the
previous set point.
The % LED indicates manual operation. The LED is on when in Manual operation and off when in AUTO operation.
When the LED is flashing, press the
Infinity
key again within 5 seconds to complete the change in operation. It the
sensor is open and LOC=0, 1 or 2, the control switches to Manual operation if the output was stable before the break
occurred.
Tuning-Automatic
It is recommended that auto-tuning be used each time a new process is initiated. If the process is being duplicated, the
parameters learned in the initial auto tune setup are stored in the memory of the control and the auto-
tune procedure isn’t
required in most applications.
Auto-tuning: This control can automatically tune the PID parameters to fit the characteristics of your particular thermal
system.
Auto-tune can only be used when Output 1 setting is hEAt and heat algorithm (h.Ag, page 5) is set for PID mode. The
heat algorithm setting is set for PID from the factory. When the auto-tune sequence has started, the lower display will
flash between tun1-attn and the main operation screen.
Changing the set point, while in auto-tune mode, will not change the set point value. The displayed value will change but
the control has locked in the original set point value tell the auto tune in complete or has been turned off by the user. Once
the control has finished "learning" the system, it returns to standard PID control with the values automatically set. Auto-
tuning is complete within 80 minutes. In order for the control to successfully complete auto-tune, the process must cross
the 90% set point value four times within 80 minutes after auto-tune has started. If this does not happen within the 80
minute time limit, Pb1 remains at 0 and the control will operate with the factory default PID values.
To start auto-tuning:
1. Set the set point value with the arrow keys to the desired temperature of operation.
2. Press the
Advance
key until the Aut prompt appears in the lower display.
3. Change the parameter to
YES
with the arrow keys.
4. Press the
Infinity
key to display the set point and sensor temperatures. While the control is in the auto-tuning
mode, the display will alternate between the set point and the "Aut" prompt. When tuning is complete, the lower
display indicates only the set point.
