L240/MG2
71
10 2-Detector Circuit Module L240/MG 2
10.1 General notes
The 2-fold Detector Circuit Module L240/MG2 provides two detector circuits
and serves the connection of magnetic reed contacts and passive glass
break sensors.
It is available as a FM installation device for a 55 mm
standard switch socket (flush mount) and thus replaces the small distribution
board that is required for conventional wiring to transfer the signal wires to
the installation cables.
Every circuit can be configured with two sensors and
is suitable for monitoring a 2-wing window for opening and glass break.
Both
circuits are also freely programmable so that other contacts and detectors
(e.g. motion detectors or technical detectors) can be connected.
The
permissible cable length per detector group is a max. of 3 m with VdS
certified systems.
Connection is undertaken via a connection tool for LSA
terminals.
The cables should be attached with cable ties to the supporting
ring of the circuit module (strain relief).
A maximum of up to 24 circuit modules L240/MG2 can be managed by the
panel.
Regarding the number of detector circuit modules L240/MG2 or
L840/MG4 and bus motion detector modules, it is important to observe that
the total number of detector circuits does not exceed 80 (incl. the 10 circuits
for the panel).
The circuit module is provided with a socket cover with screw, two fixing
screws for a standard switch socket (FM), cable ties, a spring for the tamper
contact and a VdS label to be applied to the socket cover.
10.2 Circuit diagram
The circuit modules have two circuits, whose connections feature terminals
and insulation piercing terminals.
As magnetic contacts and glass break
sensors from ABB are always 4-wire with tinned LIY4*0.14mm
2
conductors,
they are ideal for direct connection to the insulation-piercing terminals.
Bu
s (XI
B
)
Address
DIP switch
1 2 3 4 5
ON
+
-
A
B
Cct
evaluation
Cct termination resistor
(available on circuit board)
Cct
evaluation
Cct termination resistor
(available on circuit board)
With 4-core Z-wiring configuration (wired to the next detector), according to
VdS guidelines the termination resistor may be located in the last distribution
housing or module.
On each circuit, the termination is already integrated on
the circuit board and does not need to be applied externally.
The insulation-piercing strip for each circuit is designed so that every circuit
can be used to connect two detectors (e.g. magnetic reed contacts or glass
break sensors) in a Z-wiring configuration.
