Honeywell SILENT KNIGHT SK-5208, Installation And Operation Manual

Page: 101 / 122

Troubleshooting
P/N 151204 7-3
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.
firealarmresources.com