ADDITIONAL FEATURE FOR THE PEGASUS ADVANCED
Pegasus 4000 Series 01-10/15
Additional feature for the Pegasus Advanced
This version of the controller has an additional feature installed that will allow the controller to switch the
control from Loop 1 to Loop 2 of the controller when the Loop 1 Control sensor is within 100°C of the set
point.
The control sensor for the Loop 2 control is connected to Channel 1. This has the ability to bring the insert
temperature to the values required by the Reference sensor and not the Loop 1 control sensor.
To enable the Reference sensor control:
1.
Scroll to the USER ACCESS page from the Home page, as in Figure 1
Figure 1
2.
Press SCROLL button and scroll down to REFERENCE CONTROL
3.
Highlight it by pressing the SCROLL button and switch to INPUT 2
4.
Enter the value by pressing SCROLL again
5.
Ensure that SETPOINT TRIM is set to INPUT 1
6.
The REFERENCE CONTROL is now enabled
The controller will now ramp to the setpoint in the normal way, when the temperature of the CONTROL
sensor within 100°C of the SETPOINT, the controller will now switch to LOOP 2 control.
This will now use the REFERENCE sensor connected to Channel 1 as the new control sensor. This will allow
the controller to bring the insert to the required temperature for the REFERENCE sensor with a minimum of
overshoot and avoid any “bump” as the controller trims the setpoint.
Other features enabled are the promotion of the AUTOTUNE feature for both LOOP 1 and LOOP 2. These
are both located on the USER ACCESS screen. Enable them in the same way as the REFERENCE CONTROL
when you require better stability or approach to temperature in certain conditions.
AUTOTUNE LOOP 1:
This is best used when neither SETPOINT TRIM nor REFERENCE CONTROL are
enabled. When enabled a small AT can be seen flashing in the bottom right hand corner of the ISOTECH
home screen. During the tune the temperature can be seen to scroll either side of the setpoint whilst the
controller calculates the best values. When the tune is complete, the controller will insert the values and
the AT on the home page will disappear.
