Supply Voltage
6-4 Operating Manual: PSS SB 3006-3 Series
- The external 24 V supply for supplying the PSS 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).
- The external 24 V supply for supplying the INTERBUS interface must
be able to provide a current of 150 mA.
CAUTION!
The maximum permitted load current at connectors X0 and X2 should not
be exceeded. Connectors X0 and X2 should therefore be fused (see
Fig. 6-3).
• Connecting external power supplys on programmable safety systems
with an INTERBUS interface and a separate supply
- If the PSS supply and the INTERBUS interface are fed from separate
supplies, the two external supplies should be connected as shown in
Fig. 6-3.
~
=
L1
N
+24 V
0 V
PSS SB 3006-3 series
PSS connection
External power supply
X0 (PSS PWR)
X2 (IBS PWR)
~
=
L1
N
+24 V
0 V
External power supply
0 V
24 V
INTERBUS interface connection
X2 (IBS PWR)
0 V X1
Functional earth
Connect to the 0 V supply and
earth at a single point
Connect to the central earth
bar in star form
0 V
24 V
Functional earth
Fig. 6-3: Supplying the programmable safety system and INTERBUS interface
(separate power supply)
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