Omega Engineering CN9400 사용자 설명서

The proportional cycle-time can be pre-selected 

before starting Autotune, see PROPORTIONAL 

CYCLE-TIME.

The TUNE program should be run with the load cool. The output is

cycled at 75% of the setpoint value to avoid any overshoot during

the tuning cycle. The warm-up characteristics are monitored and set

DAC which minimises overshoot on subsequent warm-ups.

The TUNE AT SETPOINT program is recommended:

when the setpoint is below 100°C/200°F, where

TUNE’s tuning cycle at 75% setpoint may be too

close to ambient to produce good results;

when the process is already hot and the cooling

rate is slow;

when controlling multi-zone or heat-cool

applications;

to re-tune if the setpoint is changed substantially

from previous Autotune.

Note:    dAC is not re-tuned by TUNE AT SETPOINT.

Enter program mode

and from the display

press and hold ✱ and press ▲ once,

the controller will now display

Exit program mode.

The 

program will now start. The upper display will

alternate between 

and the process temperature as it

climbs to setpoint.

The lower display will read the setpoint value e.g.

During tuning, the main setpoint (SP1) LED will flash.

Temp

Setpoint

Cycle

75% SP

Start

TUNE

TUNE

Tuning

DAC

PID

1

1

/

4

 on/off tuning

cycles

New PID
values
entered

Time

(100% output)

TUNE

OFF

TUNE

ON

TUNE

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