Bosch d9412gv3 User Manual

D9412GV3/D7412GV3 | Operation and Installation Guide | 5.0 

Power Supply 

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Bosch Security Systems, Inc. | 10/10 | F01U143070-03 

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5.1.1  Primary (AC) Power Circuit 
The primary source is a 16.5 VAC, 40 VA, internally-
fused transformer (Bosch Security Systems, Inc. 
Model D1640). The control panel draws 200 mA when 
idle and 300 mA when in an alarm state. The total 
available auxiliary current is 1.4 A.  
Transient suppressors and spark gaps protect the 
circuit from power surges. This protection relies on 
the ground connection at Terminal 10. Ensure that 
you connect Terminal 10 to a proper ground. Refer to 
Section 4.5 Connecting Earth Ground on page 15. 
AC Power Fail 
The system indicates an AC power failure when 
Terminals 1 and 2 do not have power. The AC Fail 
Time parameter sets the number of minutes or 
seconds without AC power before the control panel 
acknowledges the failure and the number of minutes 
or seconds after the power returns before the control 
panel acknowledges restored power. Refer to the 
D9412GV3/D7412GV3 Program Entry Guide  
(P/N: F01U170807) for additional information about 
AC Fail Time and UL 864 requirements.  
5.1.2  Installing the Transformer 

 

Do not short-circuit the terminals of the 
transformer: Shorting the terminals 
opens the internal fuse, causing 
permanent failure. Connect the 
transformer to Terminals 1 and 2 of the 
control panel before plugging it into the 
power source. 

1.  Use 1.22 mm (18 AWG) wire (minimum) to 

connect the transformer to the control panel.  
The wire length should be as short as possible. 
The maximum length is 15 m (50 ft). Connect the 
battery and plug in the transformer. 

2.  Route telephone and sensor loop wiring away 

from any AC conductors, including the 
transformer wire.  
AC wiring can induce noise and low level voltage 
into adjacent wiring. Route data wiring away from 
AC and telephone wiring. 

 

Always connect the battery first and then 
plug in the transformer.  

3.  Connect the battery. Refer to Section 5.2.2 

Installing the Battery on page 22. 

4.  Plug the transformer into an unswitched, 120 

VAC, 60 Hz power outlet only.  

5.  Secure the transformer to the outlet with the 

screw provided. 

D8004 Transformer Enclosure Required for Fire 
Systems 

Use the D8004 Transformer Enclosure for the D1640 
Transformer in fire and combined fire and burglary 
applications.  

 

Check with the Authority Having 
Jurisdiction (AHJ) about mounting 
transformers on specific circuits. 

5.2.1  Secondary (DC) Power 
A 12 V sealed lead-acid rechargeable battery (D126) 
supplies secondary power for auxiliary and alarm 
outputs, and powers the system during interruptions 
in primary (AC) power. 

 

Use Lead Acid Batteries Only: The 
charging circuit is calibrated for lead-acid 
batteries. Do not use gel-cell or nicad 
batteries. 

Extra Batteries Increase Back-up Time 
To increase battery back-up time, connect a second 
12 V battery in parallel to the first battery. Use a D122 
Dual Battery Harness to ensure proper and safe 
connection. Refer to the Standby Battery and Current 
Rating Chart in the D9412GV3/D7412GV3 Approved 
Applications Compliance Guide (P/N: F01U143069) 
for battery standby time calculations. 
D1218 Battery 
The D1218 is a 12 V, 18 Ah battery for use in 
applications requiring extended battery standby time. 
Up to two D1218 batteries can be connected when 
used with a D122 Dual Battery Harness.  

 

Caution: When connecting two D1218 
Batteries to the control panel, both must 
have the same capacity (use two 17.2 Ah 
batteries or two 18 Ah batteries). 

 

 

When using two D1218 batteries, use a 
separate enclosure, a D122L Dual 
Battery Harness, and long leads. 

5.2.2 

Installing the Battery 

1.  Place the battery upright in the base of the 

enclosure.  

2.  Locate the red and black leads supplied in the 

literature pack.