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Troubleshooting
7.2
Earth Ground Fault Troubleshooting
An Earth Fault Trb indicates that the panel has detected a short between any terminal on
the panel and earth ground. To determine the location of the short, place a DC volt meter with
ground on terminal 22 (circuit ground) and positive on any of the screws that secure the circuit
board to the cabinet (earth ground).
A typical meter reading should alternate between 0 VDC and 11.7 VDC. Any other voltage
will put the panel into Earth Fault Trb (see also Table 7-1). Remove and leave off field
wiring from the panel until the meter alternates between 0 VDC and 11.7 VDC.
When an Earth Fault is indicated at the touchpad two messages will be added to the event
history buffer, Earth Fault 38 and Earth ###. This information can be very helpful to
identify where an earth ground fault exists in an intermittent earth ground situation.
If the Earth ### is lower than 133 this typically would indicate an earth ground short to a
low voltage source (13.1 VDC or less). For example, any circuit ground terminal or zone input
terminal.
If the Earth ### is higher than 134 this typically would indicate an earth ground to a higher
voltage source (13.1 VDC or higher). For example, any circuit power, standby battery, phone
lines, or AC power.
P/N 151204
7-3
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Table of Contents
Troubleshooting
