ABB COMMANDER 1900 Series Programming Manual page 24

...3 BASIC CONFIGURATION LEVEL
3.10 Scale Adjust
Information.
• Analog Inputs – do not require re-calibrating when the input type or range is changed.
• Process variable adjust reset – removes any previously programmed offset or scale adjustment settings.
• System offsets errors – can be removed using process variable scale offset adjustment.
• System scale errors – can be removed using process variable span adjustment.
• Process variable offset/span adjustment – can be used to perform spot calibration
• Pen(s) – can be independently calibrated and checked across the full range of the chart.
• Mains filter – selectable for maximum noise rejection.
• Pen Linearity Check – automatically draws a pen linearity test pattern.
PV1 (x) Span Adjust
100°C
225°C
Note. As a general rule:
use
Offset
use
Span
22
(+) Offset PV1
Engineering Range
250.0°C
50.0°C
Engineering Range
250.0°C
50.0°C
adjustment for spot calibration at
adjustment for spot calibration at
Scale Adjustment
Chart
Offset Adjustment
Display
OFFSEt
99. 8
CH1 AL1 AL2 AL3 AL4
CH2
CH3
CH4
Span Adjustment
Display
SPAN
225. 5
CH1 AL1 AL2 AL3 AL4
CH2
CH3
CH4
of engineering range span.
<50%
of engineering range span.
>50%
Display
200. 3
AND
CH1 AL1 AL2 AL3 AL4
CH2
CH3
CH4
Offset Adjustment
Span Adjustment
Display
OFFSEt
100. 0
CH1 AL1 AL2 AL3 AL4
CH2
CH3
CH4
Display
SPAN
225. 0
CH1 AL1 AL2 AL3 AL4
CH2
CH3
CH4