Saia-Burgess Controls AG
Hardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Power supply and connection plan
PCD3.Mxxx0 Classic CPU and expansion enclosure
3-28
3
3.9.4
Grounding and connection concept
2.5 mm
2
2.5 mm
2
W
...
A...
E...
0V +24V
DC
Erdungsschiene
The lower part of the PCD3 module housing contains a shielding and grounding
plate. Combined with the shielding and earthing plate in the module carrier, this
forms the common, large-area user mass for all I/O modules and the external
power supply.
When inserting a module into the module carrier, a reliable multi-point contact with
the corresponding module carrier is produced via a metal tongue on the module
housing.
The zero potential (negative pole) of the 24 V supply is connected to the negative
terminal of the supply. This should be connected to the ground bar with the
shortest possible wire (< 25 cm) of 1.5 mm
2
. The same applies to the negative
connection to the PCD3.F1xx or the interrupt terminal.
Any shielding of analog signals or communication cables should also be brought to
the same grounding potential, either via a negative terminal or via the ground bar.
All negative connections are linked internally. For flawless operation, these
connections should be reinforced externally by short wires with a cross section of
1.5 mm
2
.