Master / Slave Application; Use; Functions - Record C 127 X SU H-B OFFSET User Manual

3.9

Master / Slave Application

3.9.1

Use

The Master/Slave control allows the DFA 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 DFA is that all
the safety functions recognised by the DFA also function with double leaf doors. This applies in partic-
ular to reversing, obstacle recognition, and slow mode. The two controls continuously communic-
ate 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.
3.9.2

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 Master/Slave installations: The operation of a Master/Slave installation can only take place
from the toggle switch of the master operator. All operational 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.
NOTICE
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 user manual)
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Description
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