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Protect PV.630 Operating Instructions
26 of 72 8000047961 BAL
5 System Function
5.1 Description 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.
Fault
OFF
Waiting for feed
conditions
Fault
Operation
Night
Feed-in
conditions met
Operating
conditions
no longer
met
ON command
OFF command OFF command
OFF command
Daytime detection
Night-time detection
Fault
Fault
Fault
acknowledgement
OFF command
Delay
complete
Fault
Waiting
Figure 6 Sequence control
5.1.1 The “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.
5.1.2 The “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.