Page 6 of 20 Rev. B 11/2006 Operating instructions DFA 127 Full Power
Construction and Function
Arm types: Power transmission to the door leaf by use of standard
arm pushing or sliding arm pulling/pushing.
Locking VRR (optional): It is possible to connect an electrical door opener
(24VDC) to the operator.
Sensing units: Aesthetic actuating and self-monitoring safety elements
with adjustable sensitivity ensure optimum, smooth and
reliable operation of the door system.
4.3 Functional description
In the standard "Automatic" mode of operation the door system opens by the re-
sponse of an actuating device (e.g. radar unit) to persons or objects approaching.
The door closes after the door hold-open time, provided no further opening pulse
is received.
In the "Lock" mode of operation, the door is only opened by actuation of an op-
tional key-operated contact (SSK). The door closes after the SSK door hold-open
time, provided no further opening pulse is received.
An obstacle to the swing door leave during Closing leads to an immediate re-
opening (reverse). The obstacle position is recorded in the door operator and this
position is approached slowly when next closing. An obstacle to the swing door
leaf when Opening results in an immediate stop.
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