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Protect PV.500 Operating Instructions
26 of 70 80000031354 BAL
5 System Function
5.1 Description of Sequence Control
As soon as the equipment's control module is supplied with
voltage, sequence control starts.
Initially, the load interrupter switch Q4 remains open. Once the
initialisation phase is complete and if no deactivating faults are
pending, the load interrupter switch Q4 is closed. During
subsequent operation, the switch is only opened by deactivating
faults (Æ chapter 6).
The 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
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
Maintenance
Delay
complete
Fault
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
conditions" 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 observed by the equipment.
The monitoring parameters values are checked regularly.
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