Pilz PSS Series Operating Manual page 41

Supply Voltage
• Connecting the external power supply on programmable safety systems
without an INTERBUS interface
- The external power supply should be connected to the PSS as shown
in Fig. 6-1.
L1
N
Fig. 6-1: Supplying programmable safety systems from the PSS SB 3006-3 series
- The programmable safety system ("PSS PWR") requires a 24 VDC
supply. Check that the voltage supplied from the external power supply
corresponds.
- The external 24 V supply must be able to provide a current of max.
550 mA plus load currents taken from the test pulse outputs and load
currents for SafetyBUS p fibre-optic couplers (25 mA per fibre-optic
coupler).
CAUTION!
The maximum permitted load current at connector X0 should not be
exceeded. Connector X0 should therefore be fused (see Fig. 6-1).
6-2
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External power supply
+24 V
~
= 0 V
Connect to the 0 V supply and
earth at a single point
PSS SB 3006-3
without INTERBUS interface
(PSS PWR)
X0
0 V X1
Functional earth
Connect to the central earth
bar in star form
Operating Manual: PSS SB 3006-3 Series