Omega-engineering CN9400 User Manual download pdf (Page 28)

Advanced Settings

Heat Cool Strategy Configuration (continued)

If no improvement, return to the original value and;

In level 1 halve the value of

If the process hunts between heating and cooling, a

deadband setting may be needed. Enter a small value,

eg. 1 and observe the process. Increase the setting until

hunting stops.

Level 1 adjust value

Water cooled applications

Water cooled applications operating at temperatures greater than

100°C may suffer from the non linear effect caused by water turning

to steam. This can be countered by the non linear setting for SP2;

In level 2 set to

nL in

Multi zone applications

When tuning multi zone applications like extruders, distortions due

to thermal interaction between adjacent zones can be minimised by

running autotune on all controllers at the same time.

CALIBRATION TO ANOTHER INSTRUMENT

If the controller and instrument readings are different, the

and/or function in Function Menu Level 3

will require adjustment.

Adjust

to make an equal adjustment across the full scale

of the controller and

to make a correction when the error increases/

decreases across the scale.

1 To adjust using the function

1.1 Substitute measured values in the expression:

Instrument reading – controller reading =

Example:

Instrument reading = 396°

Controller reading = 400°

396 – 400 = (-)4°

1.2 Adjust to (-) 4° to correct error.

CYC.2

ZERO

SPAN

ZERO

SPAN

SET.2

SP2.B

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Omega-engineering CN9400 User Manual Page 28

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