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Protect PV.250 Operating Instructions
Page 20 of 51 80000027023 BAL, en
4.5.2 Single Operation
Both inverters are switched on and are feeding power into the
mains. The tie switch is open.
This operating mode is active when insolation levels are high.
Fig. 9 Single operation in partner operating mode
Change of status to linked operation:
If the capacity utilisation of the two inverters falls below a certain
value, once a delay has elapsed, the system switches to linked
operation.
The MPP tracker is switched off in both inverters and an attempt is
made to regulate the two inverters to the same DC voltage. When
the DC voltages are approximately identical, the tie switch is
closed. Once the tie switch has been closed, one inverter is
switched off. If the DC voltages cannot be regulated to the same
value in a certain time, the two MPP trackers are switched back
on. Once a delay has elapsed, the MPP trackers are switched
back off again and the next attempt to match the DC voltage is
started.
Change of status to linked operation in the event of a fault:
In the event of a deactivating or self-acknowledging fault in one in-
verter, the two inverters are switched to linked operation.
First, the inverter which is not affected by the fault is also switched
off. The DC voltage is checked. 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 certain time has elapsed, the in-
verter which is not affected by the fault is switched back on. After a
delay, a new attempt is made to exit single operation and switch to
linked operation in the event of a fault.
4.5.3 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.
Fig. 10 Linked operation in the event of a fault in partner operating mode
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