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Protect PV.630 Operating Instructions
8000047961 BAL 39 of 72
Later that morning:
Insolation increases. As a result, the inverter feeding power into
the mains works at increased capacity. If capacity utilisation rises
above a certain value, the system switches to single operation.
The tie switch opens and the inverter which is switched off logically
is switched on.
“Single operation” is active.
Evening:
Levels of insolation fall during the course of the day. The capacity
utilisation at which the two inverters are working drops as a result.
If the capacity utilisation of the two inverters falls below a certain
value, the system switches to linked operation. The tie switch is
closed and one inverter is switched off logically.
“Linked operation” is active.
Later in the evening:
Levels of insolation fall further. Capacity utilisation drops as a re-
sult. If capacity utilisation falls below a certain value, sequence
control on both inverters switches to the “Night” status. Power
stops being fed into the mains.
“Linked operation” is active.
Night:
Overnight, a decision is made as to which inverter is to be active in
linked operation the next day. So that both inverters are operated
for approximately the same amount of time, the inverters are oper-
ated alternately.
5.5.5 Partner Operation Parameters
Load threshold for terminating the INV connection:
If capacity utilisation in linked operation rises above the parameter
value, the system switches to single operation.
Load threshold for connecting the INV:
If capacity utilisation in single operation falls below the parameter
value, the system switches to linked operation.
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 switch-
es to linked operation if the difference is less than the parameter
value.
5.6 “Extended” operating mode
The “Extended” operating mode is an optional operating mode. Its
parameters are set in the factory. The technical data sheet indi-
cates whether the function is active or not. If the operating mode is
active, the inverter can feed a higher power under certain condi-
tions. The transformer must be designed for this increased feed-in
capacity.