MP500/4N-8-16 Installation
49
4.2.4.3
System with multiple supplementary power supply units
Figure 14 - Diagram with 15 supplementary power supply repeater
Sum of stretches of each BUS (primary BUS = secondary BUS) =
400 m
Distance BUS point/point = (primary BUS + secondary BUS) =
1200 m
Sum of the stretches of all the BUSSES =
6400 m
4.2.5 Sizing of audio Bus
Whenever vocal keypads are used, it is necessary to connect them to the SV500N vocal synthesis board, which must be added in the
MP500/4N, MP500/8 and MP500/16 control panels. To connect the audio bus, only a cascade connection can be used, beginning at
the control panel.
The total length of the audio bus must not exceed 300 metres.
IMPORTANT!
The use of the vocal card invalidates the EN50131 certification.
4.2.6 Sizing of Input/Output connections
The length of the cable connection between the detector or the actuator and the input to which it is connected must not excee d 500
metres.
If the device should be connected to an input configured for fast pulses (rollers, shock etc.), the length of the connection
must not exceed 100 metres.
4.3
CONTROL CRITERIA OF THE MAINS POWER SUPPLY VOLTAGE
The MP500/4N, MP500/8 and MP500/16 systems constantly control the presence of the mains power supply in the control panel,
which is detected by means of the presence of voltage in the power supply unit.
The absence and return of the mains power supply generate the following behaviours.
4.3.1 Blackout event
When the absence of the mains power supply is detected:
The alarm system is powered by the battery.
The green power supply LEDs of the keypads flash to signal the problem.
The event is recorded in the Diagnose Log.
The system does not generate an alarm immediately, but starts the "T Lack of power" count (1 hour). This parameter can be
modified during programming. Every time electrical power is restored, the "T Lack of power" count is reset to zero.
The delay determined by the "T Lack of power" serves to prevent the sending of alarms due to brief interruptions in the mains power
supply.
This is particularly useful in those places where temporary blackouts are frequent. In this way the sending of a telephone message to
signal a brief blackout and a successive call at the time power is restored are avoided.