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7.2.6 Reset of the system after a Referring to 2.6
recognised transfer to
bypass or EPO Action In 1+1 system may be that only one of the two modules has
inverter transfer to permanently blocked by some alarm and the other
module supplies normally the load (1+1 redundant): in this case, after
having identified and fixed the problem, press the Reset push button
of the module itself.
In case of EPO action both modules are blocked, in this case it's
necessary to press Reset push button on both modules.
This is a feature of 1+1 if the load allows a redundant system; if not,
it's better to switch the whole system to maintenance bypass (7.2.3).
For the module interested to the operation follow 2.5.
In case of Common battery system the inverter remains still
operating with no load, supplied by the battery and the
rectifier of the other module that are still supplying it. It's
necessary to open the switch of Auxiliary Battery Switch Box
that supplies the inverter to be turned off.
To power on a module that was insulated follow the procedure 2.4,
instead of closing battery circuit breaker (it is still closed!), close the
switch of Auxiliary Battery Switch Box.
WARNING (with Auxiliary Battery Switch Box)
With difference to the battery circuit breaker, there is no
protection against closing this switch on a shut-down
rectifier.
Such operation will cause trip of battery circuit breaker and
of a battery fuses on one or both modules. Be sure, before
operating, that battery voltage and rectifier voltage differ
less than 10%: than may be easily done reading Battery
Voltage on panels of both modules.
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