Use
The master / slave control allows the DFA 127 to perform sequential controls
without the need for external supplementary devices. This master / slave control is
used with double-leaf doors that require specific opening and closing sequences.
A particular feature of the master / slave control of the record DFA 127 is that all
the safety functions recognised by the DFA also function with double-leaf doors.
This applies in particular to reversing, obstacle recognition, and slow mode.
The two controls continuously communicate with one another via the intelligent
interface between the master and the slave operator, so that any obstacle within
the swing range of one door is always recognised by both drives.
MasterSlave
(stand leaf) (moving leaf)
16.2
Functions
The functions of the master and the slave operators correspond basically to those
of the standard DFA.
The following points are specifically mentioned:
Obstacle recognition: If one of the doors is obstructed during opening, only the
obstructed door stops. In addition, during the next opening action, only this door
will open in Slow-mode. The obstacle recognition for the two door leaves therefore
functions independently for each door.
Reversing: Reversing, on the other hand, affects both door leaves, i.e., both
doors reverse after one of them hits an obstacle. This avoids an obstacle in the
swing range being hit by both door leaves.
BDE in Master / Slave installations: The operation of a master / slave installa-
tion can only take place from the toggle switch of the master operator. All opera-
tional modes are identical with those of a standard DFA. The switch position of
the master affects both the master and the slave drive, i.e., the switch position of
the slave drive is ignored.
Emergency switch: If a Master/Slave installation needs to have an emergency
switch, a 2-pole emergency switch must be used.
(refer to the Master/Slave wiring diagram in this manual)
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