Advant
®
Controller 450 User’s Guide
Chapter 5 Maintenance
5-44 3BSE 002 415R701 Rev A
Scenario B - Fault Finding
Shut down of an I/O subrack is verified. The controller is operating otherwise. Green LED on
processor module is ON.
Figure 5-16. Fault Finding, B
I/O subrack
Regulator 5V
Replace DSSR 122
24VF
5 V
< 18 V
Y
N
= 0 V
N
Y
N
Y
Fuse blown
Replace fuse
24 V
Check for a disconnection
in the 24 V power supply
distribution
24 V ok
(rear side)
Low
vol tage
N
Y
Fuse blown
F1
Replace fuse
Replace DSSR 122
Terminal blocks
DSSR 122
Fuse prot ected +24 V
to the backplane
for connection
of 24 V
Regulator 5 V
0V
5V
Te s t 5 V
Test 24 V
Fuse F1
Fuse 24 V
Location of fuses and testpoints
I/O Subrack 1
I/O Subrack 2...3
Valid to the power supply
units for I/O subrack 2...3
See Section 5.4.10.5,
Replacement of 5 V Regulator
See Section 5.4.10.5,
Replacement of 5 V Regulator
See Figure5-17
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