SBC PCD2.M5 Series - Internal Power Supply; Earthing Concept

Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Power supply, earthing scheme, cable layout
PCD2.M5_ Classic CPUs and expansion housings
3-25
3
3.7.2 Internal power supply
GND
DC
DC
DC
DC
Voltage
monitor 5V
+5V
CLR
0V
+V
(16...24V)
PCD-Bus
LED
24V
39V
PTC
Speisung 24 VDC
PCD2
+24 V
Capacity of internal power supply
Fromthebaseunits,thefollowingcurrentsareavailablefortheplug-inmodules:
+5 V: 1,400 mA
+V(16...24V): 100mA(theexactloadsshouldbetakenorcalculatedfromthe
technical details in section 3.2, or you are advised to use the
calculation table at www.saia-support.com).
3.7.3 Earthingconcept
24 VDC
Battery
WD
Run
Halt
Error
CPU
Supply
0V +24VDC
1.5 mm
2
1.5 mm
2
Exxx Axxx
Wxxx
earthing bar
_
_
_
_
+
+
+
Shielding and
earthing plate
1.5 mm
2
/ max. 25cm
In the bottom part of the PCD2 module housing there is a shielding and earthing
plate. Together with the shielding and earthing plate in the module holder, this
constitutes the common, large-area ground for all I/O modules and for the external
power supply.
When a module is plugged into the module holder, a metal tab on the module housing
creates a reliable multi-point contact to the module carrier concerned.
Thezero-potential(Minuspole)ofthe24VsupplyisconnectedtotheMinusterminal
of the supply. This should be connected to the earthing bar with the shortest possible
wire(<25cm)of1.5mm
2
.