Appendix
PROFIBUS manual
Version FELD-V2002.02
Page 41
(1)
Remove all connectors from the unit.
Disconnect the unit from the power supply.
(2)
Use a TORX screwdriver (size 02) to undo the four screws on the rear of
the unit.
(3)
Pull out the rear panel together with all four circuit boards from the unit.
(4)
Undo the two Phillips screws holding the PROFIBUS board in place. You
can now remove the board for better access.
(5)
Locate solder bridge LP638 on the board (see drawing)
(6)
The rectangular solder pad identifies pad 1 of the solder bridge. Pads 1 and
2 are connected as standard, 3 is not connected.
Use a scalpel (knife) to break the connection between pad 1 and 2, ensuring
that there is no longer any electrical contact between the two pads.
(7)
Use a soldering iron and tin-lead solder to make the connection between
pads 2 and 3.
(8)
Refit the board in the rear panel and slide this back into the enclosure.
Make sure that the boards are running on the correct guide rails.
(9)
Secure the enclosure by fastening the TORX screws.
(10)
Reconnect the cables/connectors to the unit.
(11)
After power-up, the unit software detects the changes made to the solder
bridge. The float values are sent in the reverse order.