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
).
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
.