Hardware Settings - ABB 2600T Serie Bedienungsanleitung

4.5.2 Absolute pressure transmitter re-zeroing
Absolute pressure transmitter rezeroing is only possible when a
vacuum pressure generator is available. It is strongly recommended to
refer to the integral manual before proceeding.
4.5.3 Non-zero based calibrated devices
(eg 4 .. 20 mA = - 100 .. 100 mbar)
1. Insulate the transmitter from the process and vent the transmitter
measuring chamber/s to atmosphere.
2. Apply the lower range value pressure (4 mA) from the process or
from a pressure generator. The pressure must be stable and
applied with a high level of accuracy < 0.05 % (observing the set
damping value).
3. Check the output signal of the transmitter, if it is at 4 mA (or PV=
0) you do not need to re-zero the transmitter; if the output is not
at zero follow the below procedure:
Unscrew the data plate fixing screw on the top of transmitter
housing.
Rotate the data plate to get access to the push buttons.
Be sure that the write protection rotating switch is set to
write enable.
Push the zero (Z) button on top of the transmitter for at least
3 seconds.
The output will go to 4 mA, and if the Integral Display is
present, the message "OPER DONE" will appear. If nothing
happens check the write protection rotating switch, it is
probably set to write disable. In case of other diagnostic
messages, please refer to the instruction.
4. Once the "Zero" operation has been accomplished the
transmitter needs to be reconnected to the process.
5. Close the vent / drain valves that may have been opened.
6. Open the insulation valve/s (in case of differential pressure
transmitters please follow the following sequence:
open high pressure side insulation valve,
open low pressure insulation valve,
close equalizing valve.
Important. It is not necessary to remove the cover for this procedure (Dip
switch are already factory set).
Figure 7: External pushbuttons
10 SOI/266-XC Rev. J | 2600T Series Pressure transmitters

4.6 Hardware settings

4.6.1 Advanced HART
There are 6 dip switches located on this kind of secondary electronics.
Switch 1 and 2 allow the REPLACE MODE for sensor or secondary
electronics.
Switch 3 identifies the external push buttons functionalities: Zero/Span
adjustments or PV Bias-Offset / PV Bias Reset.
Switch 4 and 5 are for Fail Low/Fail High selection.
Switch 6: not used.
The electronic label clearly explains how to perform all the possible
selection, but please remember that all the operations with the dip
switches should be carried out when the transmitter is powered off so
as to upload new configurations at instrument start-up.
Replace mode (switch 1 and 2)
Usually switches 1 and 2 are down in "0" position.
They are moved when a replace operation is required.
Switch 1 up in "1" position is required before power up the transmitter,
when user needs to replace the electronics or the sensor.
Switch 2 down in "0" position allows the replace of the secondary
electronics. It must be moved in this position before power up the
transmitter.
Switch 2 up in "1" position indicates that a new sensor has been
installed.
AFTER ANY REPLACE OPERATION IT IS RECOMMENDED TO
MOVE DOWN IN "0" POSITION THE RELEVANT SWITCHES.
Push buttons mode (switch 3)
Dip switch 3 is set at the factory on "0" position. This means that the
external push buttons perform the zero/span adjustments. If the user
puts this switch on "1" position, the zero push buttons will modify the
PV Bias-Offset and the span push button will reset the PV Bias-Offset
value.
Fail mode (switch 4 and 5)
Should the user modify the factory-defined parameters for the fail safe
output condition in case of transmitter failure, it is necessary to enable
the modification by putting dip switch 4 on "1" position. Consequently,
it is necessary to choose whether the output has to go Upscale or
Downscale. Dip switch 5:
on "0" position the output is High (22mA)
on "1" position the output is Low (3.7mA)
4 Transmitter configuration