Siemens FS20 Commissioning, Maintenance, Troubleshooting page 177

Node 1
Line1
A1
B1
Line2
A2
B2
A1 B1 A2 B2
H2
H3
H1
FN2001
Node 1
Line1
A1
B1
Line2
A2
B2
A1 B1 A2 B2
H3 H2
H1
FN2001
Building Technologies
Fire Safety
Fiber-optic network module FN2006 / FN2007 troubleshooting steps
4 Energy supply interrupted
FN2006/FN2007
RX1
Link1
EF1
Fail1
Fail2
EF2
Link2 RX2
A Power B
VsysA
Figure 20: Energy supply interrupted
In addition, the following light up on the affected FN2001 network modules: fault
indicators H2 and H3. The fault relay on the affected module responds.
5 Ground fault on line 1, A1/B1
FN2006/FN2007
Link1 RX1
EF1
Fail1
Fail2
EF2
Link2 RX2
A Power B
VsysA
Figure 21: FN2006 / FN2007 Fault scenario 5, Ground fault B1 VP
The ground fault on line 1 (A1/B1) is mirrored on line 2 (A2/B2); in addition, EF2
flashes. The fault relay on the affected module responds.
FN2006/FN2007
Link2
RX2
Line2
A2
EF2
B2
Fail2
Fail1
Line1
A1
EF1
B1
RX1 Link1
B Power A
VsysA
FN2006/FN2007
Link2
RX2
Line2
A2
EF2
B2
Fail2
Fail1
Line1
A1
EF1
B1
RX1 Link1
B Power A
VsysA
Repair
31
Node 2
B1 A1 B2 A2
H3 H2
H1
FN2001
Node 2
B1 A1 B2 A2
H2
H3
H1
FN2001
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2016-06-02