Protect
5 System Function
5.1Description of Sequence Control
As soon as the equipment's control module is supplied with volt- age, sequence control starts.
Initially, load interrupter switch Q4 remains open. Once the initiali- sation phase is complete and if no deactivating faults are pending, load interrupter switch Q4 is closed. During subsequent operation, the switch is only opened by deactivating faults ( Chapter 6).
Inverter output contactor K7 remains open initially. The contactor is switched by the sequence control.
The figure below provides a graphical illustration of the sequence control statuses.
| OFF command | OFF command |
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| OFF |
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Operation | ON command | OFF command |
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| conditions met | Daytime detection |
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| Waiting for feed | Night | |
| conditions | ||
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Operating | Delay |
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conditions |
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no longer | complete |
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met |
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Fault |
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| Fault | Fault |
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| acknowledgement |
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| Waiting |
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| Fault |
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| Fault |
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| Fault |
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| OFF command |
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Figure 6 Sequence control
5.1.1The "OFF" Status
The equipment has been switched off logically via the DOU or the master control unit.
The equipment is running without faults, the monitoring systems are not activated.
In this status, no power is fed into the mains.
Possible change of status:
The status can be switched from "OFF" to "Waiting for feed condi- tions" by switching the equipment on via the DOU and the master control unit.
5.1.2The "Waiting for Feed Conditions" Status
The values of the DC voltage on the PV cells, the mains voltage and the mains frequency are monitored by the equipment.
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