Commissioning; Correction Of The Mounting Position; Configuration - ABB 2600T Series Operating Instructions Manual

11 Commissioning

Once the transmitter has been installed, it is put into operation
by switching on the operating voltage. Check the following
before switching on the operating voltage:
— Process and electrical connections
— The impulse line/s and the measuring chamber of the
measuring equipment must be completely filled with the
measuring medium.
The transmitter can then be put into operation. To do this, the
shut-off valves must be actuated in the following sequence (in
the default setting, all valves are closed):
(Differential models) 266Dx or 266Mx
Open the shut-off valves on the pressure tap
connection (if present).
Open the pressure equalization valve of the manifold.
Open the positive shut-off valve (on the manifold)
Open the negative shut-off valve (on the manifold)
Close the pressure equalization valve.
(Gauge & Absolute models) 266Gx, 266Ax, 266Hx, 266Nx,
266Px, 266Vx
Open the shut-off valve on the pressure tap connection (if
present).
Open the positive shut-off valve.
To put the transmitter out of operation, carry out the steps in
reverse order.
Important. For the absolute pressure transmitters model 266AS
or 266NS or 266VS with sensor range C,F or G, please be aware
that the measuring equipment will have been overloaded by the
atmospheric pressure due to the long periods of transport and
storage involved. For this reason, you will need to allow a starting
time of approx. 30 min. after commissioning, until the sensor has
stabilized to such an extent that the specified accuracy can be
maintained. If, when using „intrinsically safe" transmitters, an
ammeter is connected to the output circuit or a modem is
connected in parallel while there is a risk of explosion, the sums
of the capacitances and inductances of all circuits, including the
transmitter (see EC-type-examination certificate) must be equal
to or less than the permissible capacitances and inductances of
the intrinsically safe signal circuit (see EC-type-examination
certificate for the supply unit). Only passive or explosion-proof
devices or indicators may be connected. If the output signal
stabilizes only slowly, it is likely that a large damping time
constant has been set on the transmitter.

11.1 Correction of the mounting position

During installation of the transmitter, zero shifts caused by
mounting (e.g., a slightly oblique mounting position due to a
remote seal, etc.) may occur; these must be corrected.
Important. The transmitter must have reached its operating
temperature (approx. 5 min. after startup, if the transmitter has
already reached the ambient temperature).
This correction can be executed only the Calibration Lower
Range value is 0.0 and must be made with process (dp or p) = 0.
The correction consists in the Zero elevation/suppression
operation and can be done in three ways:
— Locally by acting on the Z push button when the
electronic switch SW 3 is raised up to 1, see section
9.2.1
— Locally using the optional LCD keypad from the menu
"Device Setup/Process Variable/PV Bias/Set PV to
Zero"
— From remote station via profibus communication writing
0.0 in the PTRB_DESIRED_PRIMARY_VALUE
In case the Calibration Lower Range value is not 0.0 then the
correction cannot be made with the local Z push button but it
can be done in the following two ways:
— Locally using the optional LCD keypad from the menu
"Device Setup/Process Variable/PV Bias/Set PV to
Value"
— From remote station via profibus communication writing
the correct measure value in the
PTRB_DESIRED_PRIMARY_VALUE.
Important. After the above operations the Calibration Range
Values are not changed.

11.2 Configuration

The transmitter implements up to three Analog Input Blocks.
Each AI produce in output a variable (AIx_OUT) suitable to be
transmitted via Profibus Cyclic communication depending by
how it has been configured in the Profibus Host (DCS or PLC).
— The Analog Input 1 (AI1) is demanded to produce the
Process Variable that, depending by the transmitter
configuration can be a Pressure (p or dp), Level, Flow or
Volume measure.
— The Analog Input 2 (AI2) is demanded to produce the
Static Pressure (p) and is relevant only for dp sensor
types producing the Static Pressure.
— The Analog Input 3 (AI3) is demanded to produce the
Sensor temperature or the Pressure (p or dp) depending
by its Channel setting.
The definition of which of the three variables have to be
transmitted with the cyclic telegram is performed during the
network configuration from the Host selecting the correct
combination of "Module" up to 3 modules max as specified in
the GSD file.
2600T Series Pressure transmitters | OI/266/PB-EN Rev. E 37
11 Commissioning