Setpoint Rate/Ramp/Soak Program Operation
76 UDC3300 Expanded Model: DC330E User Manual 5/00
Starting TUNE (Demand Tuning)
After TUNE or TUN+PV has been enabled use the following procedure to start
tuning.
Table 4-22 Procedure for Starting TUNE (Demand) Tuning
Step Action
1
Set the setpoint to the desired value.
2
Switch to Automatic mode by pressing the Manual/Auto key.
3
Initiate Tuning by:
• pressing the ▲ key when the lower display prompt = TUNE-OFF,
• pressing the Lower Display and ▲ keys simultaneously, or
• using the digital input, if configured.
Aborting Tuning
If it is necessary to stop or abort the tuning process, press the MANUAL/AUTO key
and the controller will return to manual mode. You can also disable TUNE or
TUN+PV in the ACCUTUNE or ACCUTUN2 Set Up group
Tune for Duplex (Heat/Cool)
TUNE can be done for applications using duplex (heat/cool) control. During tuning,
Accutune requires that setpoint 1 will cause a Heating demand, and then the
calculated tuning parameters will be automatically entered as PID set 1. Likewise, it
requires that tuning at local setpoint 2 will cause a Cooling demand, and then 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.
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