Before embarking on the Advanced Settings, please familiarise yourself with the basic operation of the controller as described in this manual. The following instructions assume that the user understands how to make the initial configuration, can navigate through the Function Menu and successfully Autotune the controller in heating mode.
HEAT COOL STRATEGY CONFIGURATION
Using SP2.A Cool option
Environmental test chambers used in rooms where the ambient temperature swings above and below the test temperature.
Plastics extruders where the material initially needs heating, then cooling, when it begins to heat itself exothermically due to pressure and friction applied by the process.
The purpose of cool strategy is to maintain smooth control of the process during transition from heating to cooling.
This is achieved by using PID control for heating and cooling with the proportioning bands linked by an adjustable deadband.
ADVANCED SETTINGS
From cold (normal procedure on a new installation)
Enter setpoint and allow the process to reach the setpoint using factory settings for heating only.
Autotune at setpoint
Make the following
Level 1 | set | DAC to 1.0 CYC.T to 10 and CYC.2 to 10 |
Level 2 | set | SP2.A to Cool |
Level 1 | set | TUNE to At.SP |
Autotune will cause a temporary disturbance. Check that the temperature has stabilised in heating mode before running the process in cooling mode.
If regular temperature oscillations occur, change CYC.t to optimum value. See page 9. To select Autotune Calculated
Further adjustments – Cooling
Autotune uses the same calculated bAnd value for both SP1 (heating) and SP2 (cooling). In some processes, regular temperature oscillations occur when cooling.
Make the following manual adjustment:
In level 1 double the value of | BND.2 |
A d v a n c e d S e t t i n g s
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