MP200 Installation Manual
20
• The control unit zones may operate in one of the following three modes:
- Non Balanced Zones (NC)
: when at rest they must be closed directly in the positive direction (+12V). In this
way they can indicate only that they are being opened, but will not indicate tampering.
- Single Balanced Zones
: when at rest they are closed in the positive direction (+12V), via a 15K resistance so
that the voltage level is kept below that at which the zone is held to be open. If the level exceeds the predefined
limit, for instance because of an attempt to close directly in the positive direction, which is the equivalent of
excluding the balancing resistance, a Sabotage attempt will be signalled. Consequently this offers a greater
level of security compared to a non balanced zone.
- Double Balanced Zones
: this mode resembles single balancing, but offers an extra option of being able to
differentiate alarm and tamper events on a single line, based on different voltage levels derived from a divider
made up of two 15K resistances. In this mode Sabotage is also recognized if, for instance, a cable is cut.
• The mode is selected by positioning the special dip switches present on the control unit. See Paragraph 4.6
• The intervention limit rated voltage measured at the control unit inputs is shown below:
-
Non Balanced Zones (NC)
:
closed (rest)
from +2.05V to + V power supply
open
from +2.05V to 0V.
-
Single Balanced Zones
:
closed (rest)
from +2.05V to +3.75V
open
from +2.05V to 0V
sabotage
from +3.75V to +V power supply
-
Double Balanced Zones
:
:
closed (rest)
from +2.05V to +3.75V
open
from +2.05V to +1.24V
sabotage
from +3.75V to +V power supply
sabotage
from 1.24V to 0V
Non balanced zones
connected with NC sensor
Programmed, double balanced zones
connected with NC sensor
-
-
+
+
AL AL TC TA TA
Zn
CENTRALE
SENSORE
*
* *
-
-
+
+
AL AL TC TA TA
Zn
15
K
CENTRALE
SENSORE
*
* *
Single balanced zones
connected with NC sensor
-
-
+
+
AL AL TC TA TA
Zn
15
K
15
K
SENSORE
*
To connect in series with other sensors
and one system tamper
* *
To connect to a programmed TC output
of the control unit
*
6.0 Operation modes and connections
CONTROL UNIT
CONTROL UNIT
SENSOR
SENSOR
SENSOR
CONTROL UNIT
Содержание MP 200
Страница 19: ......
