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AGE
3
OF
15
DGF7 Display
reference
manual, rev. 1, feb 22, 2022
Ground
Fault
Systems
B.V.
1.
G
ENERAL
DESCRIPTION
The DGF7 Display is a door mounted self powered operator interface to be used in conjunction with the
DGF7-3 Ground Fault (G/F) protection system. It has a four digit LCD panel that normally shows the
magnitude of residual current flowing to ground as it is measured by the DGF7-3. If a trip occurred and
the ground fault current has been removed, the display will show, in flashing mode, the measured
current just prior to the trip. The two integrated pushbuttons also allow for other data to be accessed,
such as trip codes, the G/F Trip Level as it is set by means of dipswitches on the DGF7-3, and various
parameters inside the display itself that modify its behaviour.
The DGF7 Display has settable parameters to enable the user to tailor the DGF7 Display to their needs,
Relay Test on/ off, G/F Current Display Mode (‘%’, ‘A’ and ‘kA’) and CS Configuration.
The G/F Current Display Mode is a ‘real world’, auto-ranging, readout in relative or absolute mode for
different current sensors.
When the DGF7-3 G/F protection system loses control voltage, the DGF7 Display memorises the actual
trip state, which remains accessible to the operator by pressing the ‘SHOW TRIP’ button. This feature is
especially useful when pulse tripping a breaker that also supplies control voltage to the DGF7-3 G/F
protection system.
The pushbuttons can also be used to test the segments of the LCD and to invoke a relay test on the
DGF7-3.
The display is connected to the DGF7-3 base unit using a single twisted pair of wires. No separate power
supply is needed.