D2212B/D2212BE Operation and Installation Guide
D2212B/D2212BE
Page 19
© 2002 Bosch Security Systems
39934E
Power Module
4.0
Power Module
4.1
Primary (AC) Power Circuit
A 16.5 VAC, 40 VA transformer (Bosch Security Systems D1640) is the primary power source for the D2212B panel.
The AC power circuit for the D2212B provides 1.5 A of rectified DC power. The panel reserves 1.0 A of this power for internal
operations and 1.0 A for continuously powered devices. Under alarm conditions 860 mA of power is available for
continuously powered and alarm indicating devices combined.
A 16.5 VAC, 25 VA transformer (Bosch Security Systems D1625) is the primary power source for the D2212BE panel.
The AC power circuit for the D2212BE provides 1.0 A of rectified DC power. The panel reserves 140 mA of this power for
internal operations and 500 mA for continuously powered devices. Under alarm conditions 860 mA of power is available for
continuously powered and alarm indicating devices combined.
Transient suppressors and spark gaps protect the circuit from power surges. This protection relies on the ground
connection. Make sure the panel’s ground terminal is connected to a proper ground.
4.1.1
AC Power Failure
The panel indicates an AC power failure when power at the terminals labeled 16.5 VAC is missing for 60 sec. The
AC Fail
Buzz/Rpt
program item sets the panel’s response to detected AC failure. The panel indicates an AC power restoral 60 sec.
after power restores to the terminals labeled 16.5 VAC.
4.2
Secondary (DC) Power
A 12 V, 7.0 Ah sealed lead-acid rechargeable battery (Bosch Security Systems D126) supplies secondary power for auxiliary
and alarm outputs. The battery also powers the system during interruptions in primary (AC) power.
4.2.1
Lead Acid Batteries Only
The panel charging circuit is only calibrated for lead-acid batteries. Do not use gel-cell or nicad batteries.
4.2.2
Battery 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.
D135A Prevents Deep Discharge:
The D135A Low Battery Cutoff Module protects the battery from deep discharge during
extended power outages. Deep discharge can cause permanent battery damage.
4.2.3
Battery Supervision
When the battery drops to 12.1 VDC the keypad indicates a trouble condition. The panel transmits a BATTERY LOW report.
When the battery voltage returns to 13.0 VDC and there is AC power at the terminals labeled 16.5 VAC, the keypad returns
to normal operation. The panel transmits a BATTERY RESTORAL report.
4.2.4
Investigate Low Battery Reports Immediately
If primary (AC) power is off and the discharge continues, the panel becomes inoperative when the battery voltage drops
below 10.2 VDC.
If the battery is disconnected, it takes 60 sec. for the panel to recognize the condition.
4.2.5
Battery Charging Circuit Float Charge
The float voltage for the battery charging circuit is 13.9 VDC. Deduct any continuous load for devices connected to the panel
from 1.0 A to find the maximum current available for charging. At 13.9 VDC the battery is fully charged and is maintained
with a trickle charge of approximately 5.0 mA.
