Detnov CAD-250, Руководство по установке

Страница: 79 / 84

79
ENG
ANNEX 3: Loop calculation and batteries
Both to comply with standards and with customer requirements in terms of system autonomy and with regards to
avoiding exceeding the system performance, it is necessary to make the loop consumption and load calculation.
For this, Detnov provides a calculation tool that will facilitate this task for you in the design. In any case, we have
included the theoretical basis of calculation so that you can check that your system will comply with the installation
requirements.
1. You should determine the partial consumption of each cabinet, main control panel and expansions. Take into
account that each cabinet includes its own power supply and will require its own batteries
2. Determine the system autonomy when in standby and in alarm, taking into account:
Expansion cards
The sounders connected to the panel outputs
The consumption on the auxiliary output
The total consumption of each loop with all planned devices.
3. Make the consumption calculation for each loop associated with its control panel section
4. Do not forget to include the expected consumption for the auxiliary sounder, relay outputs, etc. in the control
panel consumption.
The minimum capacity required for a battery must be calculated using the equation (A.1):
Cmin = (A1 x t1 + A2 x t2)
where:
Cmin is the minimum capacity required by the battery, in Ah;
t1 and t2
are the emergency and alarm load times, in hours;
A1 is the current absorbed by the system with the main power supply in fault state, but with the other
functions in normal operating conditions (in amps);
A2 is the alarm load (in amps).
Anticipating a loss of capacity due to ageing, the battery capacity in new condition should be 1.25 x Cmin.
...........................................................................
...........................................................................
...........................................................................
...........................................................................
...........................................................................
...........................................................................
...........................................................................
...........................................................................