VEGA D90 Profibus PA - Manual (Page 32)

32 Pressure transmitter D90 (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 and display module.
Data previously saved (e.g. adjustment val-
ues) 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