MP200 Installation Manual
29
• The sizing of the power supply unit is essential if the system is to operatore correctly. Often the problems
encountered on security systems are caused by sizing errors in batteries and power supply units.
• To be sure that the power supply unit is able to offer the correct power supply,
the following data is required:
- Total control unit, sensor and means of alarm consumption when idle (all components that are not self-
powered) in mA* in the example.
-
Minimum recharging time
for batteries, when required, in hours.
- Total capacity of batteries used in the system and charged by the same power supply unit (sum of the control
unit and means of alarm battery capacities).
• Voltage supplied with continuity by the power supply unit, in Ah =
Control unit battery ca means of alarm battery capacity x 800 + Total consumption when idle
hours
• In the example being examined (supping the control unit has one 6.5 Ah battery and 1 siren with a 1.9 Ah
battery), and applying this ratio the following is obtained:
Power supply unit current = 6,5 Ah+1,9 Ah x 800 + (190 mA)= 280 mA+(190 mA) = 470mA
24
• Thus the power supply unit for our system will have to supply with
continuity
a current of 470 mA or greater, to
ensure the functioning of the system and at the same time recharge the batteries correctly.
11.3 HOW TO CALCULATE POWER SUPPLY UNIT SIZE
Содержание MP 200
Страница 19: ......