VEGA D94 Profibus PA - Manual (Page 32)

32 Pressure transmitter D94 (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 the
display module. Data previously saved (e.g.
adjustment values) are not stored in the ad-
justment 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 con-
nection.
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