Improving Control Accuracy; Using Chek Accuracy Monitor - Omega Engineering CN9400 User Manual

The following functions are to assist engineers with
machine development, commissioning and troubleshooting.
READ SP1 OUTPUT PERCENTAGE POWER
Poor control may be due to incorrectly sized heaters.
SP1.P (Level 2) constantly displays the output
percentage power applied, which at normal setpoint
should ideally be within 20 - 80% to achieve stable
control.
CONTROL ACCURACY MONITOR
This measures the control stability, to within 0.1 °C/°F.
The monitor is started using CheK (Level 3) and the
variance (deviation), maximum and minimum temperature
are displayed and constantly updated in
Temp
Variance
Maximum
hi
SP1.P
CHEK
READ
0.1
VAr
Lo
Minimum
Time

IMPROVING CONTROL ACCURACY

Using the CheK Control accuracy monitor
To start the monitor select
Note: During monitoring either return to normal operation
or remain in program mode.
To view monitor readings: index to
The lower display will alternate between Var°
and the variance displayed in degrees (e.g. 0.6)
Press and hold and press
alternate between VAr° and the maximum hi° displayed
in degrees (e.g. 320.3)
Press and hold and press
alternate between VAr° and the minimum Lo° displayed
in degrees (e.g. 319.7)
CheK oFF stops monitor retaining readings
CheK on resets readings.
On de-powering CheK resets to oFF and rEAd is zeroed.
once, the lower display will
once, the lower display will
CHEK
ON
READ
CHEK
OFF
CHEK
ON
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