Bosch D9412GV2 User Manual download pdf (Page 20)

D9412GV2/D7412GV2 | Operation and Installation Guide | 5.0 Power Supply

20 Bosch Security Systems, Inc. | 5/05 | F01U003641B

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 16.

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

D9412GV2/D7412GV2 Program Entry Guide

(P/N: F01U003636) 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 21.

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, 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.

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