MR-2602 Installation & Operator’s Manual
6
2.6 Module Current Ratings
2.7 Standby Battery calculation chart
All components that draw current from the panel while it is in the ‘standby’ mode (AC OFF) must be
considered for the standby battery calculation. All components that draw current while in the ‘Alarm’ mode
must be considered for the alarm battery calculation.
1. The control panel will always draw the currents as shown in the chart.
2. Typically the alarm current is calculated assuming only one initiating zone is in alarm. If it is required that
more than one zone be considered, add 60 mA per zone in the Alarm column. Consult the smoke detector
manufacture’s installation sheet to determine the standby current of these devices. Write that number in
the ‘current per device’ column then multiply that number by the number of devices on the zone. Repeat for
each zone.
3. Consult the Notification Appliance installation sheet to determine the current draw for each device
connected to the NAC. For each NAC, calculate the total current in alarm and put that number (mA) in the
‘Alarm’ column.
4. For each added module in the system, multiply the number of modules times the module ‘standby’ and
‘alarm’ currents and write those totals in the ‘standby’ and ‘alarm’ columns.
5. Add up all the current drawn from the AUX+ output in the standby and alarm mode and put those totals in
the ‘standby’ and ‘alarm’ columns.
6. Add up all the currents in the ‘standby’ column and the ‘Alarm’ column.
7. Convert the ‘standby’ and ‘alarm’ currents from mA to Amps. (divide mA by 1000)
8. Write in the ‘standby’ time required. (24 or 60 Hr.)
9. Multiply the ‘standby’ Amps times the ‘standby’ time to get the ‘standby’ Amp-Hr. required.
10.Write in the ‘alarm’ time required in hours. (5 min. =.08 Hr.; 30 min. =0.5 Hr.)
11. Multiply the ‘alarm’ Amps times the ‘alarm’ time to get the ‘alarm’ Amp-Hr required.
12.Add the ‘standby’ Amp-Hr. to the ‘alarm’ Amp-Hr. for the total Amp-Hr. required.
13.Multiply the total Amp-Hr. times 1.20 for the
minimum Amp-Hr. battery required
to support the system for
the selected ‘standby time and the selected ‘alarm’ time.
Module
Standby Current
(mA) DC
Alarm Current
(mA) DC
Max. Alarm
Current (mA)
DC
MR-2602 Control panel
90
425(*)
485
MR-2605-T Remote trouble
indicator
15
15
15
MR-2605-AT R.T.I. and remote
5 zone annunciator
15
20(*)
40
MR-2806 DACT
45
60
60
MR-2605-R3 Relay module(**)
0
24
24
Note:
*Current noted assumes ONE initiating zone is in alarm. The “Max. Alarm Current” assumes all
zones are in alarm.
**Values shown are for all relays set for activation on ‘Alarm’. Each relay set for activation on
‘trouble’ is normally energized and on ‘AC fail’ will draw 0 mA.
Note:
Each NAC can supply 1.5 Amps max.
