Scale Adjust - ABB COMMANDER 1900 Series Programming Manual

...3.10 Scale Adjust

SCALE
AdJUSt
SELECt
LINCHK
FILtEr
PEN–4
PEN–1
PV–4
PV–1
NONE
NONE
rESEt
YES
NO
OFFSEt
––––––
SELECt
SPAN
––––––
Page Header – Scale Adjust
To advance to
BASIC CONFIGURATION LEVEL
Select Process Variable/Pen
Select linearity check, process variable or pen required:
LINCHK
– the pens automatically draw a test pattern to check pen linearity.
displayed on completion
FILtEr
– mains frequency filter
PEN x
– pens 1 to 4
PV–4
– process variable on channel 4
PV–3 – process variable on channel 3
PV–2 – process variable on channel 2
PV–1 – process variable on channel 1
NONE – None
Note. In the remaining frames press the
selected.
Process Variable Scale Adjustment Reset
Set YES to reset the process variable offset and span values to their nominal values (values are
reset when frame is exited).
Process Variable Offset Adjustment
Electrical and resistance thermometer inputs
required.
use resistance values obtained from standard tables.
RTD inputs:
measure the ambient temperature at the output terminals of the signal
Thermocouple Inputs:
source (calibrator). From thermocouple tables obtain the millivolt equivalent of this temperature
(a) and that for the spot calibration temperature (b). Subtract (a) from (b) and set the signal
source to the resultant value. (The voltage is negative if the spot calibration temperature is below
the measured ambient temperature).
Note. The displayed units are engineering units.
Set the value required. The decimal point position is set automatically.
Example – If the display range is 50.0 to 250.0 and a spot calibration is required at 100 and 225,
inject a signal equivalent to 100 and set the display to 100.0 using the
Span Adjust
Proceed as for
Offset Adjustment
required. The displayed units are engineering units. Set the value required. The decimal point is
set automatically.
For the example above, inject a signal equivalent to 225 and the set the display to 225.0.
Continued on next page.
3 BASIC CONFIGURATION LEVEL
frame use the
switch to view the process variable or pen
: apply the correct input for the spot calibration
above and apply the correct input for the spot calibration
switch.
dONE
and switches
is
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