Routine Setup Check; Replacement Of Pcbs - Siemens ST750 General Handbook

Re-test cable
If the fault still persists then:
(2) Increase the number of conductors/cable cores used for the neutral.
Or
(3) Replace the cable that has failed the test.
Re-test the cable to ensure that corrective action taken has removed the
problem.
• With the handset, check that all inputs used are operating correctly.
• Test the maintenance socket RCD by pressing the test button. The breaker
should operate immediately (See notes on RCD testing earlier in this section).
The following checks should be carried out before leaving the site.
• Check the manual panel gasket is intact and in the correct position. Replace as
necessary ensuring the surface is clean before fitting.
• Inspect the cabinet base seal. If damaged, the affected area should be filled with
sand and re-sealed. For details see section 5.10.

7.3 ROUTINE SETUP CHECK

Check that the real time clock is set correctly as described in the Controller Handset
Handbook.
Use the time of day TOD command to check that the real time clock is running the
correct time. A true measurement of the accuracy of the real time clock can only be
gained if the clock with which it is compared has been accurately set up.
It is essential that the time be compared with an adjacent installation using a clock
that has been synchronised to that installation within the last 30 minutes.
7.4 REPLACEMENT OF PCB
This section covers the removal and fitting of PCBs in the ST750. Safety
requirements and procedures are described to ensure that the board functions
correctly when fitted (e.g. PROM fitting).
When replacing PCBs only approved spares must be used. Use of any other
components may invalidate the Type Approval of the equipment.
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ST750 G H
ENERAL ANDBOOK
Issue 6