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Protect PV.250 Operating Instructions
Page 22 of 51 80000027023 BAL, en
Maximum DC voltage difference for connecting the INV:
When the system switches from single operation to linked opera-
tion, the MPP trackers in both inverters are switched off and an at-
tempt is made to match the DC voltages. The system only
switches to linked operation if the difference is less than the pa-
rameter value.
5 Monitoring Systems, Messages and Faults
5.1 General
All monitoring systems only generate fault messages when the in-
verter is switched on; when it is switched off, the inverter is always
reported as being free of faults.
A distinction is made between deactivating, self-acknowledging
and signalling faults.
Deactivating faults switch the unit off permanently. K7 and Q4 are
opened.
The fault can be acknowledged manually or by switching the unit
off and on. However, if the cause of the fault is still present follow-
ing manual acknowledgement, another deactivating fault will be
generated.
Self-acknowledging faults switch the unit off. K7 is opened, Q4
remains closed.
The unit starts up again when the cause of the fault is no longer
present. The fault can also be acknowledged manually or by
switching the unit off and on. However, if the cause of the fault is
still present following manual acknowledgement, another self-
acknowledging fault will be generated.
Signalling faults do not have any effect on the unit's sequence
control. K7 and Q4 remain closed.
A signalling fault acknowledges itself automatically when the cause
of the fault is no longer present. The fault can also be acknowl-
edged manually or by switching the unit off and on. However, if the
cause of the fault is still present following manual acknowledge-
ment, another signalling fault will be generated.
The following monitoring systems will cause the inverter to switch
off, are self-acknowledging or signalling and are shown on the
DOU with corresponding plain text:
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