Despatch Protocol Plus Controller (Heat Only) - Manual (Page 34)

O PERATION Protocol Plus Owner’s Manual
34 Version 2
Copyright © 2010 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
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5.6.6.2. Setting up Auto Tune
The AutoTune parameter disables or enables the AutoTune function. To use AutoTune:
1. Enter Setup Mode.
2. Press
Page key until AutoTune displays .
3. Enable Autotune by pressing
▲.
4. Press Page for three seconds to exit Setup Mode.
5. Cycle power to the instrument.
6. Set Manual Mode to
Run . The display will alternate between AutoTune and Manual .
If the Manual Mode setpoint is less than 50 degrees higher than the actual process
temperature, the AutoTune function creates an error condition. Clear the error by cooling
the process temperature or increasing the setpoint until more than 50 degrees between
them. After AutoTune has completed tuning, the AutoTune parameter will disable by
itself.
Cancel AutoTune by pressing
STOP . Access the PID page in Setup Mode, and set the
AutoTune parameter to Disable.
5.6.7. Setting up the Control Page
The Control Page contains parameters that control miscellaneous functions. Table 6
shows the menu items available.
5.6.7.1. Access Control Page
1. Enter Setup Mode.
2. Press
Page until Control displays.
3. Press the Menu .
4. Change each parameter by pressing Menu until the desired parameter is displayed,
and then press
▲ or ▼ to change the value.
Table 6. Control Page Parameters and Values.
Menu Item
Display Description Range
Cycle Time Control Cycle
Time Sec
Set cycle time in seconds for
control output 1 to 60 seconds
High limit
setpoint Control Hi-Lim
SP
5
Maximum value for all high
limit setpoints MinHiLimSP - MaxHiLimSP
6
High limit
band Control Hi-Lim
Band If=0, high limit setpoint=
Control Hi-Lim SP If>0, high
limit setpoint= Control SP
6
+
Band
Off, 3°C to 11°C (5°F to 20°F)
5 High limit setpoint is a read-only item which is calculated on Enable page
6 Includes ramping setpoints during profiles and controlled ramps