Bedienungsanleitung AEG Protect PV 500 (Seite 33 von 132) (Englisch)

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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.

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AEG Protect PV 500 Seite 33

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