Record DFA 127, Instructions Manual

Page: 82 / 103

Master / Slave Application
17
102-127108955 V1.1 82/ 102
Master / Slave Application
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 Mas-
ter/Slave control of the 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 intelli-
gent 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.
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)
17
17.1
17.2