ABB 266FF Operating Instructions Manual - page 34
34 OI/266/FF-EN Rev. B
| 2600T Series Pressure transmitters
9 Local pushbuttons
1
1 - Identification nameplate
2 - Zero pushbutton
3 - Span pushbutton
4 - Write-protection pushbutton
4
3
2
Figure 42: Pushbutton
9. Local pushbuttons
Three push buttons Zero (Z), Span (S) and Write Protection
(small Lock icon) are located under the identification nameplate,
as shown by the figure.
To gain access to the local adjustments release the fixing
screws of the nameplate and rotate clockwise the identification
plate.
Figure 43: Pushbutton assembly
Figure 44: Pushbuttons - functionalities
9.2 Operations
The Z and S buttons are enabled by default but can be disabled
with the
RB_LOCAL_OPERATIONS
parameter
The Hardware Write Protection button (small Lock icon) works
only if t
he
RB_FEATURE_SEL.HW Write Lock Supported
is s
et.
Write protection prevents the configuration data from being
overwritten by unauthorized users. If write protection is enabled,
the Z and S buttons are disabled.
However, it is still possible to read out the configuration data using
graphical user interface or communication tools (DD or DTM
based).
The control unit may be leaded if required.
Write protection is activated as follows (also refer to the symbols
on the plate):
—
First, use a suitable screwdriver to press the switch down.
—
Then turn the switch clockwise by 90°.
Warning - Potential damage to parts.
Operating the control
buttons with a magnetic screwdriver is not permitted.
9.1 Installing/Removing the external pushbuttons
—
Loosen the screws that fix the nameplate plate and slide
the plate to gain access to the local adjustments.
—
Loosen the pushbuttons assembly screws (1) holding
down the plastic element which is spring loaded.
—
Remove the gasket (3) which is positioned below the
pushbutton plastic cover (2).
—
The three pushbuttons (4) and the relevant springs (5) can
now be removed from their seat.
Important.
To deactivate the switch, push it down slightly and
then turn counter clockwise by 90°.
Important.
The function of the Z and S buttons changes
accordingly with the SW 3 selection.