Pyronix BUMBT!8, Installation Instructions Manual

Rins 181 Issue7 

    Page 15 

10.5 Battery 

Capacity 

It is recommended that the rechargeable battery used with the Atlas 8 control panel should be capable of powering the 
alarm system for a minimum of 8 hours, and that this time period should include 20 minutes of bell/strobe operation.  
The minimum battery capacity should be calculated from the current consumption of the individual system components.   
 
A typical example based on the following individual parts is shown below: 
 

Non alarm current for control panel  (7hrs 40min) 

: 

130mA (0.130 A)  

Steady state current for detectors 

   : 120mA 

(0.120 

A) 

(e.g. 8 x 15mA for 8 hours - Pyronix PIRs) 

Typical standby current for external sounder   

: 

50mA (0.050 A) 

(e.g. Self Actuating Bell for 8 hours) 

Typical on state current for external sounder (20 mins) : 

350mA (0.35 A) 

Alarm state current for control panel (20 mins) 

: 

130mA (0.13 A) 

Typical current for external strobe (8 hours)   

: 

150mA (0.15 A) 

Alarm condition for 20 mins (0.333 hrs) 

Alarm state current for control panel  

: 

0.130 

 8 

detectors 

@15mA 

    : 0.120 

 External 

sounder 

     : 0.350 

 External 

strobe 

     : 0.150 

Standby current for external sounder 

: 

0.050 

 Single 

remote 

keypad 

    : 0.015 

Required capacity for alarm condition 

= 

0.815 x 0.333 = 0.271 Ahrs 

Capacity required for standby 7hrs 40 mins (7.67 hrs)   

Non alarm current for control panel   

: 

0.130 

 8 

detectors 

@ 

15mA 

     : 0.120 

 External 

strobe 

     : 0.150 

 Standby 

for 

external 

sounder 

   : 0.050 

 Single 

Remote 

keypad 

    : 0.015 

Required capacity for standby condition 

= 

0.465 x 7.67 = 3.57 Ahrs 

Total minimum required battery capacity 

= 

0.271 + 3.57 = 3.84 Ahrs 

For this example it is recommended that you use a battery of not less than 6 AH. 
 

10.6 

End of line resistors 

When a Sensor, and tamper are wired into the same zone this is called an End of Line Zone (EOL).

The Atlas 8 panel 

uses resistors on all of its end of line zones. Two resistor values are used, these are 2K2 and 4K7.   
To identify the two resistors, coloured bands on the body are used. These are as follows: 
  
 

2K2 

 4K7

Fourth Band

Red

Red

Red

Fourth Band

Yellow

Violet

Red

 
 
 
Any unused zones should NOT be left open circuit. These should have a 2K2 resistor inserted, Refer to diagram 10.6.1, 
page 17. 
 

NOTE

: when the panel and sensors are wired using end of line resistors, to enable the zone to detect alarm 

and tamper, the system must be configured in System Option 1. Refer to Page 23.

10.6.1  Atlas 8 End Of Line Resistor Wiring Diagram.