Pilz PSS Series Installation Manual page 9

Safety Regulations
• To achieve the lowest possible residual ripple (< ± 1.2 V), we
recommend that you install a three-phase bridge rectifier or regulated
supply.
• The external 24 V power supply must be capable of supplying a
minimum of 8 A for approximately 1 s.
• The fuse between the external and the PSS power supply protects the
cabling. The size of the fuse will depend on the cable cross section and
on local regulations.
• WARNING!
Safe electrical isolation must be ensured for the external 24 V supply.
Failure to do so could result in electric shock. Power supplies must
conform to DIN VDE 0551 / EN 60 742 and DIN VDE 0160.
• The external 24 V supply should be connected to the PSS power supply
as shown in the diagram below. The external supply should be earthed
in accordance with local regulations.
If the external supply is also being used to supply the I/Os, the 0 V output
should be earthed as shown in the section entitled "Supplying the input/
outputs".
L1
N
Fig. 2-1: Supplying the system
2-2
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External power supply
~
=
Optional:
Connect to the
0 V mains and
earth at a single
point
+24 V
0 V
Connect in star to the central
earth bar
Functional earth
Installation Manual: PSS 3056 Series