Commissioning; Analague And Hart Communication Models; Standard Setting For Error Detection (Alarm); Write Protection - ABB 266HSH Operating Instructions Manual

7 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 connections
— Electrical connection
— 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).
Gauge model
— Open the shut-off valve on the pressure tap connection
— Open the positive shut-off valve.
To put the transmitter out of operation, carry out the steps in
reverse order.
Important. 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.
7.1 Analogue and HART Communication models
If the pressure applied falls within the values indicated on the
name plate, the output current will be between 1 and 5 V. If the
pressure applied falls outside the set range, the output current
will be between 0.9 V and 1 V if the range is undershot or
between 5 V and 5.6 V if the range is overshot (depending on
the respective configuration).

7.2 Standard setting for error detection (alarm)

The LCD integral display can be used to diagnose the error.
Important. A brief interruption in the power supply results in
initialization of the electronics (program restarts).
Important. Alarm Current
— Lower limit: 0.94 V (configurable from 0.9 V to 1 V)
— Upper limit: 5.4 V (configurable from 5 V to 5.6 V)
Factory settings: high alarm current (5.4 V)

7.3 Write Protection

Write protection prevents the configuration data from being
overwritten by unauthorized users.
If write protection is enabled, the buttons located in the lower
part of the display are disabled and a lock icon appears.
However, it is still possible to read out the configuration data
using a communication tool like a handheld terminal. The
control unit may be leaded if required.

7.3.1 Write protection activation via dip switch

To activate this function it is necessary to proceed as detailed
below:
— Remove instrument windowed cover.
— On the connection board, place dip switch 4 in "up"
position.7.2 Correcting the lower range value / zero shift
During installation of the transmitter, caused by mounting (e.g.,
a slightly oblique mounting position, 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) in order to perform zero
shift correction. The correction must be made at P = 0.

7.4 Securing the housing cover in flameproof areas

Each of the front faces of the electronics housing features a
locking screw (hex-head socket screw) on the bottom side.
— Install the housing cover to the housing by hand-
tightening it.
— Turn the locking screw counterclockwise to secure the
housing cover. This involves unscrewing the screw until
the screw head stops at the housing cover.
2600T Series Pressure transmitters | OI/266/LowP-EN Rev.A 17
7 Commissioning