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196 UDC 3300 Controller Product Manual 4/00
Starting TUNE
(demand) tuning
After TUNE or TUN+PV has been enabled, use the procedure in Table
5-35 to start tuning.
Table 5-35 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:
• Set Up Group ACCUTUNE
• Function Prompt ACCUTUNE or ACCUTUN2
• Select TUNE or TUN+PV, using either ▲ or ▼.