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202 UDC 6300 Process Controller Product Manual 1/03
5.20 Accutune, Continued
TUNE for Duplex
(Heat/Cool)
“TUNE” can be done for applications using Duplex (Heat/Cool) control.
During tuning, Accutune II requires SP 1 will cause a Heating demand,
and then the calculated tuning parameters will be automatically entered as
PID SET 1. Likewise, it requires tuning at Local SP 2 will cause a
Cooling demand, and the cooling parameters will be entered as PID SET
2.
The tuning sequence will cycle the controller’s output two full cycles
between the high output limit and 50% for HEAT or between 50% and the
low output limit for COOL while allowing only a small process variable
change above and below the setpoint during each cycle.
Configuring TUNE for
Duplex (Heat/Cool)
To configure this item, refer to Section 3 - Configuration:
• Set Up Group “ACCUTUNE
• Function Prompt “ACCUTUNE” OR “ACCUTUNE2
• Select “TUNE” OR “TUNE+PV”. Use (
or )
Using TUNE at Start-
up for Duplex
(Heat/Cool)
After “TUNE” or “TUNE+PV” has been enabled, use the procedure in
Table 5-39 to use “TUNE” at Start-up for Duplex (Heat/Cool) control.
Table 5-39 Procedure for Using TUNE at Start-up for Duplex
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 Lower Display
and keys simultaneously to initiate
Heat tuning.
The output will cycle between 50% and 100% (or high output limit).
A large “T” appears 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 Lower Display
and keys simultaneously to initiate
Cool tuning.
The output will cycle between 0% and 50% (or low output limit).
A large “T” appears in the upper display until tuning is completed and
final Cool parameters are entered for PID Set 2 in the Tuning group.
Continued on next page
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