Power Outputs; Circuit Protection; Total Available Power; Aux Power Terminals - Bosch D7212G Operation And Installation Manual

5.0

Power Outputs

5.1

Circuit Protection

Three Positive Temperature Coefficients (PTCs) protect the panel from short circuits on both the continuous and
programmable power outputs. If the panel is programmed for power supervision and short is sustained on one of the
power outputs, the panel transmits a BATTERY LOW or BATTERY MISSING for Bosch Security Systems Modem IIIa
Communication Format, or TROUBLE ZN 9 for BFSK.
• One PTC protects Terminal 3: Auxiliary Power
• One PTC protects Terminal 6: Alarm Power Output, Terminal 7: Alternate Alarm Power Output, and Terminal 8:
Switched Auxiliary Power. A short on one of these terminals disrupts the power to the other two.
• One PTC protects Terminal 32: Power +.
5.2

Total Available Power

The system produces up to 1.4 A of combined power at 10.2 VDC to 13.9 VDC for all powered devices. The outputs listed
below share the available power. These outputs are shown as red circles on the face plate.
Terminal 3 - Auxiliary Power. Use this terminal to power devices requiring continuous power.
Terminal 6 (Relay A) - Alarm Power Output. Normally open, power on alarm.
Terminal 7 (Relay B) - Alternate Alarm Power Output. Normally open, power on alarm.
Terminal 8 (Relay C) - Switched Auxiliary Power. Normally open, power off on reset.
Terminal 32 - Power +
Use this terminal to power SDI (Serial Device Interface) devices such as command centers and the D9131A Parallel Printer
Interface Module.
5.3

Aux Power Terminals

5.3.1 Continuous Current Draw

The continuous current draw for powered devices connected to Terminals 3, 8, and 32 must not exceed 1.4 A. Devices
powered from these outputs must operate over a range of 10.2 VDC to 13.9 VDC.
Power restricted for fire and combined fire/burglary systems: Use the Fire System Power Formula to calculate the current
available for fire and combined fire/burglary system (see Section 5.4 Programmable Power Outputs Terminals).
5.4

Programmable Power Outputs Terminals

5.4. 1

Programming

The power outputs at Terminals 6, 7, and 8 are programmed as Relays A, B, and C. All relays are programmed in the Relays
section of the program. Relays are assigned a relay type, Fire Bell for example, when they are assigned to an area. Relays can
be assigned to one or more areas.
The Bosch Security Systems defaults set Relay A (Terminal 6) as a Steady Alarm Bell output and Relay B (Terminal 7) as a
Pulsed Fire Bell output, and Relay C (Terminal 8) as a Verification/Reset output for smoke detectors. The D7212G Program
Entry Guide (P/N: 4998138538) contains complete instructions for programming relays. Descriptions of the functional
characteristics of each terminal appear on pages 30 through 31.
See the Bell Parameters section of the program to set the Fire Bell, Alarm Bell output responses for relays. Four annunciation
patterns: Steady, Pulsed, California Standard, and Temporal Code 3 are available.
Voltage Output at Terminals 6, 7 and 8: If Terminals 6, 7, and 8 don't provide the expected output:
• Check the programming for Relays A, B, and C in the Relays section of the program.
• Check the Bell Parameters section of the program to verify the Alarm and Fire Bell responses are programmed for
the expected duration and pattern.
• Check the Point Assignments to verify each point is programmed for the expected local response.
© 2003 Bosch Security Systems
D7212G Operation and Installation Guide
Page 29
D7212G
Power Outputs
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4998138544C