Table of Contents
4.0
Power Supply
4.1
Primary Power
4. 1 . 1
Primary (AC) Power Circuit
An 18 VAC, 22 VA internally fused transformer (Bosch Security Systems CX4010) is the primary power source. The AC
power circuit provides 700 mA of rectified AC power. The panel reserves 100 mA of this power for internal operations,
leaving 600 mA for powered devices.
Transient suppressors and spark gaps protect the circuit from power surges. This protection relies on the panel's earth
ground connection. Make sure you connect the earth ground terminal to a proper ground. See Section 3.4.1 Connecting
Earth Ground.
The system indicates an AC power failure when the power at the terminals marked "18 VAC" is interrupted. Power must be
missing for 120 sec. before the panel acknowledges the failure. Power must be maintained at those terminals for 120 sec.
before the panel acknowledges the restoral of power.
4. 1 .2
Installing the Transformer
Shorting the terminals for prolonged periods of time may cause permanent damage. Connect the transformer to the
panel terminals before plugging it into the power source.
CAUTION
Bosch Security Systems recommends that you always connect the battery first and then plug in the transformer. See
Section 4.2.2 Installing the Battery for more information.
IMPORTANT
Use 18 AWG (1.2 mm) (minimum) wire to connect the transformer to the panel. Wire length should be kept as short as
possible. The maximum length is 15.2 m (50 feet).
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.
Only plug the transformer into an unswitched, 120 VAC, 60 Hz power outlet. Secure the transformer to the outlet with the
screw provided.
4.2
Secondary Power
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. Push one
connector on the black battery lead to panel's "Batt-" connector, and then push the lead's other connector to the negative (-)
side of the battery. Push one connector on the red battery lead to panel's 'Batt+' connector, and then push the lead's other
connector to the positive (+) side of the battery.
High Current Arcs Possible: The positive (red) battery lead and the panel's "Batt+" connector can create high
current arcs if shorted to terminals or the enclosure. Use caution when working with the positive lead and the
panel's "Batt +." Always disconnect the positive (red) lead from the battery before removing it from the panel.
4.2.3
Replacement
Bosch Security Systems recommends battery replacement every three to five years under normal use. Exceeding the
maximum output ratings, or installing the transformer in an outlet that is routinely switched off, causes heavy discharges.
Routine heavy discharges can lead to premature battery failure. Record the date of installation directly on the battery.
4.2.4
Battery Supervision
When the battery drops to 12.1 VDC, the panel (if programmed for power supervision) transmits a Battery Low Report.
If the battery is missing or shorted and the panel is programmed for power supervision, it transmits a Battery Missing
Report.
When battery voltage returns to 13.0 VDC, the panel (if programmed for power supervision) transmits a Battery Restoral
Report.
© 2003 Bosch Security Systems
D6412/D4412 Operation and Installation Guide
Page 19
D6412/D4412
Power Supply
45349E
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