Power Supply; Primary Power Terminals 1 And 2; Primary (Ac) Power Circuit; Installing The Transformer - Bosch D9412GV4 Installation And System Reference Manual

D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 5.0 Power Supply
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5.0 Power Supply

5.1

Primary Power Terminals 1 and 2

1 2
,
5.1.1

Primary (AC) Power Circuit

The primary source is a 16.5 VAC, 40 VA,
internally-fused transformer (such as a 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 21.
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
secs without AC power before the control panel
acknowledges the failure and the number of
minutes or secs after the power returns before
the control panel acknowledges restored power.
Refer to the Control Panels
(D9412GV4/D7412GV4 v2.03) Program Entry
Guide (P/N: F01U265459) 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 18 AWG (1.22 mm) wire (minimum) to
connect the transformer to the control panel.
The wire length should be as short as
possible. The maximum length is 50 ft (15 m).
Connect the battery and plug in the
transformer.
2. Route telephone and sensor loop wiring away
from any AC conductors, including the
transformer wire.
Bosch Security Systems, Inc. | 7/16 | F01U265457-09
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 29.
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

Secondary Power Terminals

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 17.0
Approved Applications in this guide 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.
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