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68 Start-up and operation
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Additional instructions for closing the DC switch-disconnector
If the DC bus is not alive and the main DC switch-disconnector [Q11] is in OFF position, the
main DC switch-disconnector [Q11] is mechanically locked to OFF position by interlock
[K11]. In order to get the supply unit started there are two possibilities: the DC bus is powered
up by another supply unit (if applicable), or the DC bus must be powered by means of the
local charging control switch [S4], which forces the charging circuit on.
IGBT supply modules can then be charged as follows:
Note:
Before local operation of the charging circuit via local charging control switch [S4], make
sure that the main breaker(s) of the supply unit is racked in and the DC switch-disconnector
for line-up charging [Q40] is closed.
•
Force the charging circuit of the unit on via setting the local charging control switch [S4]
to position "1".
•
Wait for a few seconds for the DC bus charging up to nominal voltage level.
•
Charge the IGBT supply modules: close the charging switch [Q10] of the units that are
to be powered up.
•
After the IGBT supply modules are charged and the charging light [P11] on the cabinet
door illuminates, the lock of DC switch-disconnector [Q11] is released. The main DC
switch-disconnector [Q11] can now be closed, and the charging switch [Q10] opened.
•
Repeat this for all IGBT supply module cubicles belonging to this supply unit.
•
After that, set the local charging control switch [S4] back into OPEN position and the
DC bus will be discharged again.
When the DC switch-disconnector [Q11] is in ON position, follow the normal start-up
procedure to charge the line-up and to start the operation of the supply unit.
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