VEGA D91 Profibus PA - Manual (Page 34)

34 Pressure transmitter D91 (Profibus PA)
Instrument modification
6 Instrument modification
6.1 Exchange of adjustment mod-
ules in the processing unit
The modular construction of the processing
unit allows retrofitting, interchange and re-
moval of the adjustment modules and display
module. Data previously saved (e.g. adjust-
ment values) are not stored in the adjustment
module but in an EEPROM of the electronics
module and readjustment is therefore not
necessary. The connection of the modules is
made via a 4-pole plug connection.
Exchange of the adjustment module
Removal of the adjustment module
• Separate processing unit from the power
supply.
• Remove the screws on the upper side of
the housing and remove the cover or the
display module.
• Disconnect the cables from the terminals,
and if applicable, pull out the plug con-
nection of the display module.
• Remove the two screws of the adjustment
module.
• Remove adjustment module and pull out
plug connection.
Insertion of an adjustment module
• Plug the plug connection of the new ad-
justment module into the plug-in socket of
the electronics module.
• Fasten the new adjustment module.
• Reconnect the cables, and if applicable,
also the cable from the display module.
• Replace the cover or the display module
of processing unit.
• Reconnect processing unit to power
supply.
Processing unit
Module
without
adjustment Module for
menu-driven
adjustment
Display
module