ABB 266FF Operating Instructions Manual - page 35
2600T Series Pressure transmitters |
OI/266/FF-EN Rev. B 35
9 Local pushbuttons
9.2.1 Wet Ranging operation – SW 3 = 1
The Z (Zero) button performs the ‘Lower Range Setting’
operation and sets as 0% the actual measured pressure value
After the ‘Z’ button is kept pushed for more than 2 seconds,
when released, the pressure value measured in input is written
in the
PRTB_PRIMARY_VALUE_RANGE_0%
.
The
PRTB_PRIMARY_VALUE_RANGE_100%
is shifted in
order to keep the same SPAN
Before:
— Span =
(PRTB_PRIMARY_VALUE_RANGE_100%
- PRTB_PRIMARY_VALUE_RANGE_0%)
After:
—
PRTB_PRIMARY_VALUE_RANGE_0% =
PRTB_CAL_VALUE
—
PRTB_PRIMARY_VALUE_RANGE_100% =
SPAN + PRTB_ PRIMARY_VALUE _RANGE_0%
The S button performs the ‘Upper Range Setting’ operation
and sets as 100% of the calibration scale the actual measured
pressure value. After the ‘S’ button is kept pushed for more
than 2 seconds, when released, the pressure value measured
in input is written in the
PRTB_PRIMARY_VALUE_
RANGE_100%
. The SPAN changes as consequence.
—
PRTB_PRIMARY_VALUE _RANGE_100% =
PRTB_ CAL_VALUE
9.2.2 PV Scaling operation – SW 3 = 0
The Z button performs the ‘ZERO elevation/suppression’
operation. After the ‘Z’ button is kept pushed for more than 2
second, when released, the
PTRB_PRIMARY_VALUE
is
zeroed.
The zeroing is achieved by an internal writing of 0.0 in the
PTRB_DESIRED_ PRIMARY_VALUE
. The difference between
PTRB_DESIRED_PRIMARY_VALUE
and the
PTRB_CAL_
VALUE
is written in the
PTRB_BIAS_VALUE
.
—
PTRB_BIAS_VALUE
=
(PRTB_CAL_VALUE
- PRTB_DESIRED_PRIMARY_VALUE)
The
PTRB_BIAS_VALUE
(positive or negative) is added in the
calculation algorithm at the
PTRB_CAL_VALUE
for the
production of the
PTRB_PRIMARY_VALUE.
—
PTRB_PRIMARY_VALUE
=
(PRTB_CAL_VALUE + PRTB_BIAS_VALUE)
The S button (3) performs the ‘Reset ZERO elevation/
suppression’ operation. After the ‘S’ button is kept pushed for
more than 1 second, when released, the
PTRB_BIAS_VALUE
is reset to Zero eliminating in this way any effect of elevation or
suppression for the
PTRB_PRIMARY_VALUE
that, after this
operation, returns to produce again the same value of the
PTRB_CAL_VALUE.
—
PTRB_BIAS_VALUE = 0.0
—
PTRB_PRIMARY_VALUE = PTRB_CAL_VALUE
Important.
Should you need more details about the above
mentioned FF commands, please refer to the addendum of this
manual, downloadable from ABB website www.abb.com/pressure