Operation
62 UDC2300 Controller Product Manual 12/00
Tune for Duplex (Heat/Cool)
“TUNE” can be done for applications using Duplex (Heat/Cool) control.
During tuning, Accutune II assumes SP 1 will cause a Heating demand, and then then the
calculated tuning parameters will be automatically entered as PID SET 1. Likewise, it
assumes tuning at Local SP 2 will cause a Cooling demand, and the cooling parameters
will be entered as PID SET 2.
Configuration Check for Duplex
Make sure:
• TUNE has been enabled see to Subsection 4.7 - Accutune Set Up Group for details.
• Key Enabled – see Subsection 4.5 – Tuning Set Up Group for details.
Using TUNE at start-up for Duplex (Heat/Cool)
Table 6-8 Procedure for Using TUNE at Start-up for Duplex Control
Step Action
1
Heat Zone:
a. Adjust the Local SP1 to a value within the Heat Zone.
b. Insure that the UDC is in Automatic mode.
c. Press the AUTOTUNE key to initiate Heat zone tuning.
The output will cycle between 50 % and 100 % (or high output limit).
“TUNE” flashes in the upper display until tuning is completed and final Heat parameters are
entered for PID Set 1 in the Tuning group.
2
Cool Zone:
a. Adjust the Local SP2 to a value within the Cool Zone.
b. Insure that the UDC is in Automatic mode.
c. Press the AUTOTUNE key to initiate Cool tuning.
The output will cycle between 0 % and 50 % (or low output limit).
“TUNE” FLASHES IN THE UPPER DISPLAY UNTIL TUNING IS COMPLETED AND FINAL
COOL PARAMETERS ARE ENTERED FOR PID SET 2 IN THE TUNING GROUP.
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