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5.0 Power Supply
5.1
Primary Power Terminals 1 and 2
5.1.1
Primary (AC) Power Circuit
The primary source is a 16.5 VAC, 40 VA, internally-
fused transformer (Bosch Security Systems Model
D1640). The control panel draws 200 mA when idle
and 500 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 Failure
The system indicates an AC power failure when
Terminals 1 and 2 do not have power. The AC Fail
Time program item 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
D7212GV2 Program Entry Guide (P/N: F01U003804) for
additional information about AC Fail Time.
5.1.2
Installing the Transformer
Do not short 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 19.
Bosch Security Systems, Inc. | 5/05 | F01U003805B
D7212GV2 | Operation and Installation Guide | 5.0
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/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, 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.
Warning - 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.
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).
D1218 Battery
The D1218 is a 12 V, 17.2 or 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.
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.
3. Connect the black battery lead to Terminal 4, and
then to the negative (-) side of the battery.
Power Supply
19
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