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MP120
5) Cover fastening screw
To install the MP120M and MP120M/TG control units, proceed as follows:
1. use a pencil to mark the positions of the three fastening holes on the wall, paying attention to the cable run;
2. drill the wall by using a bit at least 6 mm large, then fit the three dowels in;
3. fit a dowel also below the hole just next to the tamper;
4. let the cables run into the special passageways, then secure the control unit by means of the dowel screws;
5. tighten a screw down below the tamper (into the dowel previously set) and adjust the screw, if necessary, to
compensate for wall unevenness (if any) and ensure that the tamper is locked after the control unit is closed.
2.3.3 INPUT HARDWARE CONFIGURATION
All the alarm inputs of the control unit (including 24-h) may be configured alternately as follows: N.C. (normally
closed), SB (single-balancing) and DB (dual-balancing). To choose the type of connection, use control unit master
card dip-switches 5 and 6 (see the figure of paragraph
2.2 FITTING OPTIONAL ITEMS AND ACCESSORIES
for
the dip-switch position), according to the diagram below:
Dip-switch 5
Dip-switch 6
Connection mode
ON ON Normally
closed
ON OFF Single-balancing
OFF Unimportant
Dual-balancing
Warning!
The type chosen will apply to all the control unit inputs, including 24-h.
All the control unit alarm inputs are referred to the positive.
Differences between the various types of inputs
The choice of the input type affects the way in which the detectors are connected and the alarm is distinguished.
N.C. inputs are the simplest ones and may signal opening only. Dual-balancing inputs are the most complete ones:
in fact, input opening can be distinguished from tampering. Single-balancing inputs are half-way, as illustrated on
page 21.
Types of physical connections that can be made with the different devices
Control unit
Expansion
Inserter
Keypad
Normally closed (NC)
■
■
■
■
Single-balancing
■
■
Dual-balancing
■
■
"KEY" INPUT (MECHANIC KEY) - TERMINAL 37
"KEY" input
The KEY input is used to connect a mechanic key and can, as far as actuation and deactivation are concerned, be considered
as a "main switch" for the system. Its behaviour depends on how it is configured through programming (system options):
•
impulsive
: it switches all the sectors ON and OFF, yet allowing the same to be able to be done with the keypads and
inserters, too;
•
hold-on
: it switches all the sectors ON and OFF. It takes priority over the other control elements (keypads and inserters),
which cannot actuate or deactivate the sectors any longer.
"KEY" input connection
If the KEY input is used, connect an external switch (for hold-on control) or a button (for impulsive control) to the negative (-
S). Either the switch of the button shall be key-controlled due to safety reasons, in accordance with the “IMQ CERTIFICATION
- SAFETY SYSTEMS” indications on the last page.
