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AEG Protect PV 500 Manual

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Protect PV.500 Operating Instructions
80000031354 BAL 29 of 70
If the DC voltage continues to increase due to the sun's rays
getting stronger and the mains voltage and mains frequency are
within acceptable limits, a start-up attempt is made. During a start-
up attempt, the inverter stack is switched on, thereby drawing
power from the DC voltage that is present. The inverter output
contactor K7 is open during a start-up attempt. If the load on the
DC voltage causes it to collapse too dramatically during this start-
up attempt, the inverter stack is switched off again and there is a
delay until the next start-up attempt is made.
If the DC voltage does not dip too significantly, the inverter output
contactor K7 closes and power is fed into the mains. The inverter
is now in the "Operation" status.
Day:
During the course of the day, the inverter will remain in the
"Operation" status if the sun's rays are strong enough and no
faults occur. Power is fed into the mains and the inverter output
contactor K7 is closed.
Evening:
As the sun goes down, the power fed into the mains decreases.If
this power falls below a certain value for a certain time, the
operating conditions are no longer met. The inverter stack is
switched off, the inverter output contactor K7 opens and the unit
switches to the "Waiting" status.
Once the "Waiting" status delay has elapsed, the unit switches
back to "Waiting for feed conditions". Although the sun's rays are
not as strong, the DC voltage might still be high enough for a
successful start-up attempt with the inverter stack and the inverter
output contactor K7 being switched on again. However, because
the sun's rays are not as strong, it is unlikely that the operating
conditions will still be met in the "Operation" status. As a result, the
equipment will switch back to the "Waiting" status once a delay
has elapsed. When the equipment switches back to this status, the
delay is extended until the unit switches back to the "Waiting for
feed conditions" status.
The cyclic changes of status "Operation" -> "Waiting" -> "Waiting
for feed conditions" -> "Operation" can take place several times
depending on insolation, the time of year, location and other
conditions (e.g. snow on the PV cells). So that the inverter output
contactor K7 is not overloaded by this cycle of changes, the
"Waiting" status delay is extended every time the unit switches to
this status. This has very little effect on the energy fed in, because
the low levels of insolation mean that hardly any energy is being
generated.
Later in the evening:
Levels of insolation continue to fall. As a result, the DC voltage
also carries on dropping. If the DC voltage drops below a certain
value for a certain time, no more start-up attempts are made. If the
DC voltage continues to drop, the unit switches to the "Night"
status.
Night:
The equipment shuts down all possible loads so that as little
energy as possible is being consumed. The equipment remains in
the "Night" status until the following morning.
… 33 …


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