Use Of The Green Keys - Trim - Calibration - Pv Scale Option - ABB 691HT Operating Instructions Manual

TRIMMING AND SETUP
SNSR 4 - 20 LOOP CALI
TRIM TRIM TEST
C A L I B R A T I O N
PV OUT RERAN
SCALE % GING
PV : 25 mbar
RSET SET SET
BIAS PV0 PV
LRV : [ -60.00 ]
URV : 130.00
< - - - -> CLR ENTR
PV : 25 mbar
RSET SET SET
BIAS PV0 PV
PV : [ 30 ] mbar
< - - - -> CLR ENTR
C A L I B R A T I O N
PV OUT RERAN
SCALE % GING
C A L I B R A T I O N
PV OUT RERAN
SCALE % GING
WARNING - Control loop
should be in manual
PV : 0.01 mbar
OP : 50 %
O/P O/P
LOW HIGH
- 40 -

Use of the Green Keys - TRIM - Calibration - PV Scale Option

(600T EN Pressure transmitter only)
The scope of this procedure is to allow the user to set the transmitter for
reading a specified value of PV, that is to apply a scaling to the PV
reading. This option is useful every time it is required to elevate or
suppress a pressure indication.
BRA
Starting from the SELECT GREEN KEY menu, press TRIM and then F4
(CALIBRATION).
The PV Scale option appears as key F1 in the CALIBRATION menu.
Pressing key F1 (PV SCALE) a warning message is displyed: "WARNING
- Control loop should be in manual" with the label PROCEED for the
key F4.
The PV SCALE option menu contains three options: Reset bias,
Set PV 0 and Set PV.
The PV value appears on the display and is continuously updated.
Pressing F1 the value of the Bias is set to 0. Let's remind that a bias value
set (not equal to 0) disables the trimming operations; the Bias value can
be verified in the review section. On the first line of the display "wait . . ."
message appears during the reset operation.
The key F2 (Set PV 0) is used to set the actual PV reading to 0. If the
operation is performed correctly the user is than asked to define the
range values; the LRV and URV are expressed in the same unit of the PV.
The key F3 (Set PV) is similar to set PV 0, but allows the user to decide
for a PV reading value different than zero.
The user is asked to enter the value and then the bias value is
automatically calculated and applyed to the actual reading.
Again the user can reconfigure the range of the transmitter by entering
the LRV and URV.
By pressing ESCAPE the following message appears: "WARNING -
Loop may be returned to auto - PROCEED". Use F4 to continue and
to return to the CALIBRATION menu.
With another ESCAPE the TRIMMING and SETUP menù appears on the
display.
Use of the Green Keys - TRIM - Calibration - Out % option (600T
EN Pressure transmitter only)
Starting from the CALIBRATION menu press F2 (Out %) to access the
procedure. This setting is used to automatically redefine the transmitter
calibration by using the reading value in percentage.
After the warning message that reminds the user to verify the loop
conditions, and pressing the key F4, the following display appears:
PRO
CEED
The display is continuously updated with the PV value and the output
percentage. The latter can be redefined by accessing the two options:
O/P LOW and O/P HIGH.