62 Electrical design and installation
Manual Energy Storage Inverter ESI-S
6.13.3 Cabling of warning functionality
A warning condition is a condition that can be set up by the user in such a way that if the
condition is met, a digital output contact of the ESI-Manager user interface (Cf.
) is closed. As an example consider a case where the user has set up an upper warning
level for the network voltage. If the level measured by the inverter becomes higher than
the predefined warning level and this condition remains valid for a preset time, the
associated digital output will be closed. By monitoring the digital output, the customer
will then know when the network voltage becomes too high and subsequently he can
take appropriate action.
Note that the warning functionality is not associated with a inverter trip. It only has a
monitoring function.
describes the behavior of the digital output contact
configured as warning contact for different inverter operating modes.
Table 27: State of a digital output contact configured as
warning contact for different inverter operation modes
Inverter state
Normally open digital contact state
Disconnected from the supply
Open
Inverter (auxiliaries) connected
to the supply, no warning
present
Open
Inverter (auxiliaries) connected
to the supply, predefined
warning present
Closes when warning present for predefined time
Otherwise, contact remains open
Inverter (auxiliaries) connected
to the supply, predefined
warning disappears
When closed before and warning disappears for at least the
predefined time, contact opens.
When closed before and warning disappears for a time
smaller than predefined time, contact remains closed.
Otherwise, contact remains open.
gives a list of the warning conditions that can be assigned to a digital output.
Table 28: List of possible warning conditions that can be assigned to a digital output
Warning condition
Supply voltage (RMS) higher than preset value
Supply voltage (RMS) lower than preset value
Supply voltage imbalance higher than preset value
Ground current level higher than preset value
IGBT Temperature higher than preset value
Control board temperature higher than preset value
Remark: All warning levels can be changed by the user.
Any of the six digital outputs can be used to cable warning functionality. A maximum of
3 warnings can be assigned to the digital outputs. However, by default the digital
