Monitoring Functions
9.1 Earth Fault
SIMOCODE PRO V PN FDI
Programming and Operating Manual, 05/2020, A5E44499659002A/RS-AA/001
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Response to trip level
Signaling, tripping
Delay
Setting range: 0 - 25.5 s (0.5 s)
Response to warning level
Disabled, signaling, warning
Delay
Setting range: 0 - 25.5 s (0.1 s)
9.1.3
External Earth Fault Monitoring
External Earth Fault Monitoring
External Earth-fault Monitoring via a residual current transformer and an Earth-fault Module
is normally used in the following cases:
●
Where networks with high impedance are grounded
●
Where precise measurement of the earth-fault current is necessary, e.g. for the purpose
of condition monitoring.
Rated Fault Currents of 0.3 A / 0.5 A / 1 A are evaluated by the 3UL22 residual current
transformer. The response delay of the residual current transformer is 300 ms - 500 ms. This
response delay can be further delayed by parameterizing SIMOCODE pro accordingly.
With the 3UL23 residual current transformer, it is possible to determine the precise residual
current as a measured value, and to define freely selectable warning and trip limits in a wide
range from 30 mA - 40 mA.
Principle of operation:
The main conductors and, if present, the neutral conductor to which the load is connected,
are routed through the opening of the 3UL23 residual current transformer. Its secondary
winding is connected to the earth-fault module. If an insulation fault occurs, for example, a
residual current is created between the inflowing and outflowing currents, and this is
evaluated by the earth-fault module.
Settings in the device configuration:
Select here whether the external earth-fault monitoring is to be used via a residual current
transformer and earth-fault module.
