Earth Ground; Ground Fault Detect Enable; Ground Fault Detection Troubleshooting - Bosch B9512G Installation Manual

Control panels
3.2.1

Earth ground

To help prevent damage from electrostatic discharges or other transient electrical surges,
connect the system to earth ground before making other connections. The earth ground icon
identifies the earth ground terminal. Recommended earth ground references are a grounding
rod or a cold water pipe. Make the connection using 14 AWG (1.8 mm) to 16 AWG (1.5 mm)
wire.
To help prevent damage from electrostatic discharges or other transient electrical surges,
connect the system to earth ground before making other connections. The
earth ground terminal. Use a recommended earth ground reference, such as a grounding rod
or a cold water pipe. Make the connection using 14 AWG (1.8 mm) to 16 AWG (1.5 mm) wire.
Notice!
Do not use telephone or electrical ground
Do not use telephone or electrical ground for the earth ground connection. Do not connect
other control panel terminals to earth ground.
Caution!
Avoid electrostatic discharge
!
Always touch the earth ground connection with the
control panel.
3.2.2

Ground Fault Detect enable

To meet UL 864 requirements, enable Ground Fault Detect.
A ground fault is a circuit impedance to ground sufficient to result in the annunciation of a
trouble condition.
The control panel has a ground fault detection circuit that when enabled, detects ground
faults on Terminals 1 to 9 and 11 to 30.
If a ground fault condition occurs, the keypads annunciate a ground fault and control panel
transmits a trouble message.
When the control panel recognizes that the ground fault condition is corrected, and remains
corrected for between 5 to 45 consecutive seconds, the control panel clears the fault from the
keypad display and sends a restoral report.
The control panel detects ground fault at ≤ 300 Ω.
Enabling Ground Fault Detect and reports
4
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3.2.3

Ground fault detection troubleshooting

The control panel requires -2.1 V decay to 0.
Measuring and comparing voltage for ground fault detection
1.
2.
3.
Bosch Security Systems B.V.
In RPS or in the Installer Services Portal programming tool (available in Europe, Middle
East, Africa, and China), set the following parameters:
PANEL WIDE PARAMETERS > Miscellaneous > Ground Fault Detection. Set to Enable.
PANEL WIDE PARAMETERS > Report Routing > Burglar Reports > Trouble Report. Set to
Yes.
PANEL WIDE PARAMETERS > Report Routing > Burglar Reports > Burg Restore (After
Trouble). Set to Yes.
Set your digital voltmeter (DVM) to measure VDC.
Connect the red DVM lead to control panel Terminal 10, and the black DVM lead to
Terminal 9.
Compare this voltage to the following table.
UL Installation manual
Control panel installation | en
icon shows the
icon first, before beginning work on the
2019-12 | 06 | F.01U.304.001
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