Fuses - Siemens TC12 Installation, Commissioning And Maintenance Handbook

2.4.8.15 Received Characters IMD, Key to Press 'R'
This screen displays the data received from OTUs on IMD 0 port 0. It displays
each OTUs reply on a separate line on the screen OTU 0 at top. This screen only
shows the OTUs on IMD 0 port 0 but can be used to obtain indication of the health
of the system.
The characters on each line are the hexadecimal representation of the reply bytes
(__ means no data) for that OTU, each line is the correct length (number of
characters) for the number of reply bytes for the OTU.
2.4.8.16 Test Characters, Key to Press 'T'
Displays a set of characters to test the modes of the display. Not of any real use in
maintenance of the Instation, as in normal use the Instation has no display.
2.4.8.17 Reset Free time counters and IMD status indicators, Key to Press 'Z'
Simply resets counters to best condition i.e. 100% free, and IMD cumulative status
indicators to 0.
2.4.8.18 Exit
This text shows the combination of keys to press to exit the TC12 software on the
PC and return to DOS.

2.4.9 Fuses

Internal Power Supply Fuse on the PSU PCBs
The Power supply fitted to every PSU board used in the system (part number
667/7/22631/000, manufactured by Daren Electronics PLC type PP40-30) is fitted
with an Anti surge 1 A, 250 V 20 x 5 mm fuse (part number 518/4/90631/015).
Master Switch Panel Assembly
Figure 16 shows the layout of the Master Switch Panel and RCD. The positions of
the fuses are shown.
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
Page 59 Issue 10