Reer JANUS - MI Models Used with L Operational Logic; Installation

8540573 • 16/09/2016 • Rev.20 9
Both operating modes with 4 sensors are TWO-WAY.
The correct Muting sequence can start either from sensor 1 or from sensor 4.
MI MODELS USED WITH “L” OPERATIONAL LOGIC
In this model the sensors 1 and 2 are on the same side with respect to the vertical curtain and are positioned
in front of the dangerous opening (Figure 9 and Figure 10). This model is unidirectional and is useful for
protecting openings with pallet exit.
The activation of the Muting function takes place following the simultaneous interruption (within max. 4 sec)
of sensors S1 and S2. The Muting function remains while both sensors are occupied.
On release of the first of the 2 sensors, the material will still have 4 seconds available to abandon the
protected area delimited by the curtain. The Muting condition will be disabled as soon as the protected area
is released.
If the curtain is still occupied after the 4 seconds, the OSSD outputs are disabled, interrupting machine
functioning.
For this model, the maximum duration of the Muting condition (timeout) can be selected in 30 seconds or 90
minutes (Table 13).
 It is indispensable that a Muting sequence is completed (release of controlled area) in order to
guarantee the correct activation of the successive sequence.

For safe functioning of the MI series (with L logic), it is necessary that the muting sensors
are positioned inside the dangerous area (traced in Figure 9 and Figure 10).
Figure 9 - Crossed sensors
Figure 10 - Parallel sensors
INSTALLATION
Before installing the JANUS safety system, check that:

The safety system is used only as stopping device and not as machine control device.

The machine can be controlled electrically.

Any dangerous action of the machine can be promptly interrupted. In particular, the
stopping time of the machine must be known, if necessary measure this.

The machine must not cause dangerous situations due to flying or dropping of material;
otherwise, additional mechanical guards are required.

The minimum size of the object that must be detected must be greater than or equal to the
resolution of the model selected.
D
D
A
A
N
N
G
G
E
E
R
R
O
O
U
U
S
S
A
A
R
R
E
E
A
A
Emitter
Receiver
Sensor 2
Sensor 1
D
D
A
A
N
N
G
G
E
E
R
R
O
O
U
U
S
S
A
A
R
R
E
E
A
A
Emitter
Receiver
Sensor 2
Sensor 1