ABB 266 DDS, Manual

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2 6 6 DDS H A RT |
P R E SSU R E T R A N SM I T T ER S | O I/ 2 6 6 D DS - EN R E V. B
7 Operation
Local push buttons functionality
266 transmitters allow local adjustments via the on-board
non intrusive push buttons. The push buttons are located
under the identification nameplate. To gain access to
the local adjustments release the fixing screws of the
nameplate and rotate clockwise the identification plate.
Potential damage to parts .
Operating the control buttons with a magnetic screwdriver is
not permitted.
Figure 47: Pushbutton functionalities
Factory settings
Transmitters are calibrated at the factory to full span (0 to URL)
or according to the customer’s span if specified. The calibrated
range is provided on the name plate whereas the tag number
on the additional tag plate. The calibrated range and tag
number are provided on the name plate. If this data has not
been specified, the transmitter will be delivered with the
following configuration:
Parameter Factory setting
Lower Range Value (LRV) (4 mA) Zero
Upper Range Value (URV) (20 mA) Upper Range Limit (URL)
Output transfer function Linear
Damping 1 second
Transmitter failure (alarm) Upscale (21 mA)
Optional LCD HMI scale 1 line PV and output signal bargraph
IMPORTANT
All of the configurable parameters can easily be modified
either via the optional LCD HMI, with a HART handheld
terminal or a compatible software solution. Information
regarding flange type and material, O-ring materials, and
filling liquid type is stored inside the non-volatile memory of
the device.
Configuration types
Pressure transmitters can be configured as follows:
• Configuration of the parameters for the lower and upper
range values (via Zero and Span push buttons), without an
integral LCD HMI.
• Configuration of the pressure transmitter using the integral
LCD HMI with keypad (menu-controlled).
• Configuration with a handheld terminal.
• Configuration using a PC/laptop via the graphical user
interface (DD/FDI).
Configuring the transmitter without an
integral LCD HMI
The “lower range value” and “span” parameters can be set
directly on the transmitter using the external push buttons.
The transmitter has been calibrated by the manufacturer based
on the order information. The tag plate contains information on
the “lower range value” and “upper range value” set. In general,
the following applies:
The first pressure value (e.g., 0 mbar) is always assigned to the
4 mA signal (or 0%), while the second pressure value (e.g., 400
mbar) is always assigned to the 20 mA signal (or 100%). To
change the transmitter ranging apply the pressure for the
“lower range value” and “upper range value” to the measuring
equipment. Make sure that the measuring limits are not
exceeded.
LRV and URV configuration (4 to 20 mA ranging)
• Apply the pressure for the “lower range value” and wait
approx. 30 s until it has stabilized.
• Press the “Z” button (external) for at least 5 seconds. This
sets the output current to 4 mA.
• Apply the pressure for the “upper range value” and wait
approx. 30 s until it has stabilized.
• Press the “S” button (external) for at least 5 seconds. This
sets the output current to 20 mA.
• If required, reset the damping to its original value.
• Record the new settings. The respective parameter will be
stored in the non-volatile memory 10 seconds after the “Z” or
“S” buttons are last pressed.
This configuration procedure only changes the 4 to 20 mA
current signal; it does not affect the physical process
pressure (PV value) also shown on the digital display or user
interface. To avoid potential discrepancies, you can follow the
procedure below. After performing a correction, you must
check the device configuration.
WARNING
Identification nameplate
Span pushbutton
Write-protection
pushbutton
Zero pushbutton
IMPORTANT