FST 75/150
260-2210-002 EN064
Page 21 / 37
Detailed description of functions
Closing edges
The control unit is equipped with three input terminals for safety devices (PSPEs / ESPEs) - one for
protecting the main closing edge in closing direction, two for protecting secondary closing edges or drawing-
in-points. See circuit diagram for installation.
The closing edge must be connected
prior
to switching on the power supply. The control unit will then
evaluate the connected resistance value and thereby define the type of safety facility. Should the safety
facility then need to be replaced again by a different type of safety facility, the power supply will need to be
switched off and then on again after connecting. If a system should be faulty, a corresponding error alarm
will be given and it will only be possible to operate in dead-man control.
The FST 75/150 control unit can evaluate various types of safety devices:
Type 1 : Pressure wave switch (break contact)
Pressure wave switches with a terminal resistance of 1K2 (colour code: brown-red-red-gold). The functioning
of this system is tested in the final “close” position. The pre limit switch “close” or the premature shut down
on DES is used to initiate the test function.
After premature shut down (shortly before reaching the final “close” position), a period of 2 seconds will
count down. Within this time, it is necessary to actuate the system by touching down the contact edge. This
actuation tests whether the pressure wave edge is intact. It is then possible to perform a run.
Type 2 : Self-monitoring contact edge (closing contact)
This type of closing edge evaluation is for electric contact edges with a terminal resistance of 8k2 (colour
code: grey-red-red-gold). The terminal resistance must be connected at the end of the contact edge or
already be integrated.
Typ 3: Fraba system optical contact edge
The principle behind this function is based on that of a one-way photo cell. When the contact edge is
actuated, the ray of light is interrupted.
Safety device in opening direction
The safety for opening direction may be realised by photo cells, rope switches or self-monitoring contact
edges. 2 provisions may be connected. After activation a release in closing direction is carried out.
The provision has to be configured appropriately. (Refer to menu safety edge in opening direction)
The function of photocells may be tested before each opening.
Only rope switches with forced disconnector may be used. The have to be prestressed and have to switch a
normally closed contact in case of draw of rupture.
