Siemens TC12 Installation, Commissioning And Maintenance Handbook page 34

This switch should normally be set to on. If it is set off then LED LP2 will light once
the board is powered up and the local SIP audio alarm will not sound in the event
of any faults.
If the Audible alarm on the system fault indication panel (SIP) sounds it should be
cancelled as required from the UTC TCC terminal. If the reason for the alarm is a
UTC TCC failure, an authorised/trained person (trained in the safety aspects of
working with mains powered equipment), should be asked to cancel the audio
alarm, using the audio off switch on the PSU PCB.
The volume of the audio alarm is adjusted by turning the screw on potentiometer
RV1.
Connect the cable (part number 667/1/22612/000) from the local SIP into
connector PL1 on the PSU PCB in the first rack. The PCB will need to be in the
card guide for the cable to reach. If there are additional 19" racks in the Instation
there is no connection to connector PL1 on the other PSU boards in these racks.
Connector PL2 - No connection normally. This is used to connect to digital output
boards when used in a digital output rack (See section 2.2.5.2), as well as for
interfacing with the Telecommand 8 highway.
Connectors PL3 and PL4 connect to the Digi I/O card as described in section
2.2.2.7.
Connectors PL5 to PL8 connect to Modem PCBs as described in section 2.2.4.2.
Connector PL9 - No connection normally (used for a remote SIP only).
Connector PL10 - Additional Racks In the Same Cabinet
If a further rack are included in the Instation then the PSU board on the second
rack is set up as follows
Connect from PL10 on the first PSU PCB to PL10 on the second PSU PCB, using
cable 667/1/22655/000. If a third rack is fitted, connect from PL10 on the second
PSU PCB to PL10 on the third PSU PCB and so on.
Connectors PL1, 2, 3, 4 and 9 are not used on the PSU PCBs of additional racks.
Connectors PL5 to PL8, on the PSU PCBs of additional racks, connect to modem
boards in those racks.
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
S3 - Audio ON/OFF
Volume Control
Connector PL1
Connector PL2
Connectors PL3 and PL4
Connectors PL5 to PL8
Connector PL9
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