Primary Power Terminals; Primary (Ac) Power Circuit; Installing The Transformer; Secondary Power Terminals - Bosch D9412G Operations & Installation Manual

D9412G/D7412G | Operation & Installation Guide |
4.0 Power Supply
4.1

Primary Power Terminals

4. 1 . 1

Primary (AC) Power Circuit

A 16.5 VAC, 40 VA internally-fused transformer (Bosch
Security Systems Model D1640) is the primary power
source. The AC power circuit provides 1.9 A of rectified
AC power. The panel reserves 500 mA of this power for
internal operations, leaving 1.4 A for powered devices.
Transient suppressors and spark gaps protect the circuit
from power surges. This protection relies on the ground
connection at Terminal 10. Make sure to connect
Terminal 10 to a proper ground (see Section 3.5
Connecting Earth Ground).
AC Power Failure
The system indicates an AC power failure when the
power at Terminals 1 and 2 is missing. The AC Fail
Time program item sets the number of minutes or
seconds that AC must be missing before the panel
acknowledges the failure and the number of minutes or
seconds after the power returns before the panel
acknowledges the restoral of power. See the D9412G/
D7412G Program Entry Guide for additional information
regarding AC Fail Time.
4. 1 .2

Installing the Transformer

Do Not Short Transformer Terminals: Shorting
the terminals opens the internal fuse causing
permanent failure. Connect the transformer to
Terminals 1 and 2 of the panel before plugging it
into the power source.
Connect the transformer to the panel using 1.22 mm (18
AWG) wire (minimum). Keep wire length as short as
possible. The maximum length is 15 m (50 ft.).
AC wiring can induce both noise and low level voltage
into adjacent wiring. Route phone and sensor loop
wiring away from any AC conductors, including the
transformer wire. Route data wiring away from AC and
phone wiring.
Connect the Battery and Plug in the Transformer:
Always connect the battery first and then plug in the
transformer. See Section 4.2.2 Installing the Battery.
Plug the transformer into an unswitched, 120 VAC,
60 Hz power outlet only. 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/burglary
applications. Check with the Authority Having
Jurisdiction (AHJ) on mounting transformers on specific
circuits.
Bosch Security Systems | 10/03 | 43488E
4.0 Power Supply
4.2

Secondary Power Terminals

4.2. 1

Secondary (DC) Power

A 12 V, 7 Ah (up to 14 Ah) 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, 7 Ah
battery in parallel to the first battery to form a 12 V,
14 Ah battery. Use a D122 Dual Battery Harness to
ensure proper and safe connection.
D1218 Battery
The D1218 is a 12 V, 17.2 or 18 Ah battery and can be
used in applications requiring extended battery standby
time. Up to two D1218 batteries can be connected when
used with a D122 Dual Battery Harness.
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).
4.2.2

Installing the Battery

Place the battery upright in the base of the enclosure.
Locate the red and black leads supplied in the literature
pack. Connect the black battery lead to Terminal 4, and
then to the negative (-) side of the battery. Connect the
red battery lead to Terminal 5, and then to the positive
(+) side of the battery.
High current arcs are possible. The positive
(red) battery lead and Terminal 5 can create
high current arcs if shorted to other terminals
or the enclosure. Use caution when working
with the positive lead and Terminal 5. Always
disconnect the positive (red) lead from the
battery before removing it from Terminal 5.
The battery terminals and wire are not power
limited. A 6.4 mm (0.250 in.) spacing must
be maintained between the battery terminals,
battery wiring, and all other wiring. Battery
wiring may not share the same conduit,
conduit fittings, or conduit knock-outs with
other wiring. See Figure 5.
EN | 21