Pilz PSS Series Operating Manual page 42

• Connecting the external power supply on programmable safety systems
with an INTERBUS interface and a common supply
- If the PSS supply and the INTERBUS interface are fed from a common
power supply, the external supply should be connected as shown in
Fig. 6-2.
L1
N
Fig. 6-2: Supplying the programmable safety system and INTERBUS interface
- The external 24 V supply must be able to provide a current of max.
550 mA for the PSS and 150 mA for the INTERBUS interface, 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. 6-2).
Operating Manual: PSS SB 3006-3 Series
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External power supply
+24 V
~
=
Connect to the 0 V supply and
earth at a single point
(common power supply)
PSS SB 3006-3 series
with INTERBUS interface
0 V
0 V X1
Connect to the central earth
bar in star form
X0 (PSS PWR)
X2 (IBS PWR)
Functional earth
6-3