Bedienungsanleitung AEG Protect PV 250 (Seite 13 von 51) (Englisch)

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Protect PV.250 Operating Instructions

Page 13 of 51 80000027023 BAL, en

If the DC voltage continues to increase due to the sun's rays get-

ting 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 con-

tactor is open during a start-up attempt. If the load on the DC volt-

age causes it to collapse too dramatically during this start-up at-

tempt, the 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 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 "Opera-

tion" 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 operat-

ing 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 suc-

cessful 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

unit will switch back to the "Waiting" status once a delay has

elapsed. When the unit switches back to this status, the delay is

extended until the unit switches back to the "Waiting for feed con-

ditions" 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 condi-

tions (e.g. snow on the PV cells). So that the inverter output con-

tactor K7 is not overloaded by this cycle of changes, the delay in

the "Waiting" status 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 gener-

ated.

Later in the evening:

Levels of insolation continue to fall. As a result, the DC voltage

drops again. If the DC voltage drops below a certain value for a

certain time, no more start-up attempts are made. If the DC volt-

age continues to drop, the unit switches to the "Night" status.

Night:

The Protect PV.250 shuts down all possible loads so that as little

energy as possible is being consumed. The inverter remains in the

"Night" status until the following morning.

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AEG Protect PV 250 Seite 13

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