Commissioning; General Remarks; Output Signal; Zero Point Correction Following Installation - ABB 2600T Series Operating Instruction

10 Commissioning

10.1 General remarks

Once the pressure transmitter has been installed, it is put into
operation by switching on the operating voltage.
Prior to switching on the operating voltage check:
— Process connections
— Electrical connection
— Complete filling of the impulse line and measuring
chamber of the measuring cell with the measuring
medium.
The transmitter can then be put into operation.
To do this, the valves must be actuated in the following order
(in home position, all valves are closed):
1. Open the shut-off valves on the pressure tap connection
(if present).
2. Open the pressure equalization valve of the valve block.
3. Open the shut-off valve of the high pressure side (H) on
the valve block.
4. Open the shut-off valve on the low pressure side (L) on the
valve manifold.
5. Close the pressure equalization valve.
Decommissioning is executed in the reverse sequence.
If, when using transmitters with type of protection "intrinsic
safety", 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 power
supply unit).
Only passive or explosion-proof test devices or display
instruments 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.

10.2 Output signal

If the applied pressure is within the values indicated on the
rating plate, the output current ranges between 4 and 20 mA.
If the pressure applied falls outside the set range, the output
current will be between 3.5 mA and 4 mA if the range is
underranged or between 20 mA and 22 mA if the range is
overrranged (depending on the respective configuration).
Standard setting for normal operation
3.8 mA / 20.5 mA
A current that is < 4 mA or > 20 mA may also indicate that the
microprocessor has detected an internal error.
Standard setting for error detection
21.8 mA
In this case diagnosis of the error can be executed with the
aid of different configuration tools.
IMPORTANT (NOTICE)
A brief interruption in the power supply results in
initialization of the electronics (program restarts).

10.3 Zero point correction following installation

Once the transmitter has been installed, it is advisable to
check the zero point and correct it if necessary.
Fig. 28: Operating buttons, write protection turn switch
1 Zero | 2 Span | 3 Write protection switch
266CRx, 266JRx, 266CSx, 266JSx | OI/266CXX/266JXX/HART-EN Rev. B 33