1. General Description
The DFA remote actuator is a retro-fittable motor-driven remote control device for residual current
circuit-breakers (DFS 2/4) in the Doepke product range. It is thus possible to connect or disconnect
residual current circuit-breakers as well as to trip RCCBs from a remote location. The remote tripping
affects the RCCB in the same way as if pressing the test button.
The actual switching position of the actuated residual current circuit-breaker (connected, tripped, dis-
connected) can be indicated by integrated relay switching contacts (1 normally open contact each with
common pole).
The DFA can be de-activated with the aid of the rotary switch on the enclosure cover, so that it can-
not be accidentally activated from a remote location, e. g. during maintenance work at the distribution
board. The DFA may optionally also be operated in automatic mode, whereby 15 seconds after a trip
occurs one attempt at reconnection is automatically instigated.
!
Danger of crushing!
The relevant operating status of the DFA is indicated by a green LED on the enclosure cover.
The DFA can be retrospectively, and easily, expanded for integration in the Dupline installation sys-
tem by fitting an optional DFA-DI interface so that the DFA can, without problem, be connected to
the Dupline bus. The DFA-DI is a small board which – as is common with PC technology – is simply
plugged into the DFA. This then also allows the above named functions to be requested remotely and
the switching positions to be indicated. Such indicating can be realized, for example, by means of
actuating a relay (e. g. the DRM 8) or by visualising on a text or touch screen display.
The control commands transmitted via the Dupline bus have the same status as any control commands
sent via signal inputs.
The DFA can be operated either with a 24 V
AC
or 24 V
DC
power supply.
2. Preparation
2.1. Preparation for Remote Trip Facility
If a remote tripping function is required for a residual current circuit-breaker, then the DFA needs first to
be set for the rated residual operating current I
∆n
of the residual current circuit- breaker to be actuated,
so that the relevant test residual operating current I
∆
is being applied. This setting is carried out within
the device. For this purpose insert a standard screwdriver first into one and then into the other of the
two recesses provided on the housing front and slightly twist while, at the same time, gently raising the
cover (do not lever it open forcibly!).
At the bottom left on the PCB a rotary switch is then visible; this being marked with the letters A-D.
The relevant test residual operating current I
∆
can now be set with a screwdriver according to the table
below (factory setting = A):
Doepke
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