Honeywell UDC 3300 manual Starting Tune demand tuning

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

1Set the setpoint to the desired value.

2 Switch to Automatic mode by pressing the MANUAL/AUTO key.

3Initiate 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

TUNE for duplex (heat/cool)

Configuring TUNE for duplex (heat/cool)

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 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.

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 ▼.

196 UDC 3300 Controller Product Manual 4/00