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Protect PV.630 Operating Instructions
38 of 72 8000047961 BAL
If the faulty inverter has a self-acknowledging fault, the DC voltag-
es of both inverters are compared. When the DC voltages are ap-
proximately identical, the tie switch is closed and the inverter which
is not affected by the fault is then switched back on. If the DC volt-
ages are still not the same once a set time has elapsed, the invert-
er which is not affected by the fault is switched back on. After a de-
lay, a new attempt is made to exit single operation and switch to
linked operation in the event of a fault.
If the faulty inverter has been permanently deactivated by a deac-
tivating fault, the DC voltages cannot be compared because the
faulty inverter is disconnected from the DC voltage via switch Q4.
In such a case, there is no possibility of equalising currents being
generated when the tie switch is closed. The tie switch is therefore
closed and the inverter which does not have a fault is switched
back on again.
5.5.3 Linked Operation in the Event of a Fault
One inverter is switched on and is feeding power into the mains.
The other inverter has been shut down due to a fault. The tie
switch is closed.
This operating mode is active when one inverter is affected by a
fault.
Figure 12 Linked operation in the event of a fault in partner operating mode
Change of status to linked operation:
The system switches to linked operation when the fault message is
acknowledged in the inverter affected by the fault. The inverter af-
fected by the fault is switched off logically once the fault has been
acknowledged.
5.5.4 Partner Operation During the Course of the Day
Early morning:
The tie switch is closed from the previous day. Overnight, a deci-
sion has been made as to which inverter will be switched on logi-
cally in linked operation on this day and which will be switched off
logically. If the sequence control (see Chapter 4.1) of both invert-
ers now switches from the “Night” status to the “Waiting” status,
one inverter is switched off logically. The other inverter is switched
on logically and feeds power into the mains if the sun's rays are
strong enough.
“Linked operation” is active.