50
MP500/4N-8-16 Installation
4.3.2 Continued blackout alarm
If the blackout persists until the Time of the Lack of power set expires, the following occurs:
The system generates a “Continued blackout alarm”.
The specialised lack of power outputs are activated (“LACK OF POWER")
A dedicated alarm message is sent via the telephone transmitter.
The alarm is memorized in the Diagnose Log.
IMPORTANT!
If the battery level descends below the threshold of 12.5 V, the “Continued blackout alarm” is generated
immediately, even if the time Lack of power has not yet passed.
4.3.3 Restoration of the mains power supply
Once the mains power supply restores power, the green power supply LEDs of the keypads stop flashing and remain on and the
system restarts a time count. Once 5 minutes have passed, if the power has been continuously present, the following occurs:
Via the telephone transmitter, the message dedicated to the restoration of mains power supply is sent.
The event of the restoration of the mains power supply is memorized in the Diagnose Log.
Potential brief interruption in the mains power supply during the time count will result in the resetting of this time.
4.4
BATTERY MANAGEMENT CRITERIA
The system is capable of detecting all the possible conditions under which the back-up battery may be needed and to provide for its
management adequately in automatic mode. The detection is based on the voltage read at the battery terminals
+BT
and
–BT
.
The control carried out on the status of the battery is done in two ways, depending on the presence or absence of the mains power
supply.
4.4.1 Control and charging of the battery with the mains power supply present
The MP500 systems, when the mains power supply is present, provide constant control of the battery. If the battery is not detected, or
if it is completely dead, the system assumes the status of
“No battery”. In this status the battery charging circuit is turned off: this
means that if the battery is not connected to the terminals of the connection cables, (red and black faston) there is no power. As soon
as battery is connected, the charging circuit is once again activated and keeps the battery charged with a limited maximum current.
Note:
If due to some anomaly the battery should reach a charge of 14 V, the charging circuit is automatically deactivated to prevent
damage to the battery.
4.4.2 Controlling the battery with mains power supply absent
Even if the mains power supply is absent, the battery is controlled continually.
When the voltage at the battery terminals falls below 11.5 V, the
“Battery low” event is generated.
When the voltage at the battery terminals drops further and reaches 10.5 V, the control panel disconnects the battery to prevent
potential damage due to a deep discharge (a function present only in the MP500/8 and MP500/16 systems). The restoration to the
“Battery low” condition occurs only after a return of the mains power supply and after a Test battery gives positive results.
4.4.3 Test battery
To test the efficiency of the battery, the "Test battery" is carried out periodically. This test is carried out:
30 seconds after the return of the control panel power supply or of the mains power supply.
Every 24 hours (automatically).
After a “Test battery” command from the Installer or Master menu (manual test).
The Test battery lasts 30 seconds during which the battery is charged. If the battery is deemed inefficient, the test is interrupted and the
“Battery low” event is generated, resulting in the immediate “Battery low alarm”.
The “Battery low” status lasts until the next “Test battery” that concludes with a positive result.
If the mains power supply is absent, the Test battery is not carried out.
4.5
SELF-DIAGNOSTIC FUNCTIONS
The system autonomously and continuously carries out controls to ensure that the system functions correctly and is perfectly efficient.
In addition to testing the presence of the mains power supply and the battery as illustrated above, the tests below are also carried out:
Control of the system power supply voltage.
Control of the battery charging circuit efficiency.
Control of the correct communication among the devices.
Control of the correct functioning of the secondary bus with the automatic cut-off in case of sabotage or malfunction.
Control of the correct functioning of the control panel CPU.
Control of the PSTN telephone line.
Control of the SIM-Card and connection with the GSM telephone network.
When the system detects a critical condition, a specific signal is given. The beginning of the anomalous event and its end ar e recorded
in the Diagnose Log. Some anomalies can also activate dedicated outputs. If there is an anomaly in the power supply with the increase
in output voltage higher than 15 V (for example, as a consequence of a lightning strike to the mains power supply), the MP500 /8 and
MP500/16 control panels automatically disconnect all the power supply outputs to protect the devices connected from damage due to a
power surge.
