3: I/O Point Control; Impedances That Cause Earth Ground Faults - Honeywell 6808 Installation And Operation Manual

Testing and Troubleshooting
Follow these instructions to locate multiple SLC devices:
1. Select 2 (Point Functions) from the Main Menu.
2. Select 5 (SLC Dev Locator).
A message similar to the one shown in Figure 12.2 will display.
3. Press the up or down arrow to toggle NO to YES then press ENTER.
If NO is chosen you will exit back to the Point Function menu.
If Yes is chosen the system will cease normal operation leaving the premise unprotected.
4. Select the SLC loop.
5. Enter up to eight SLC addresses for the devices you wish to locate. The LEDs on the selected devices will start flashing.
6. Press the left arrow to exit SLC multi-locator function.
12.4.3 I/O Point Control
NOTE: Once you exit the system will resume normal operation
This feature allows you to toggle any output on or off and trip any input device. This can be useful to test a point's output mapping.
Follow these steps to control a I/O point:
1. Select 2 (Point Functions) from the Main Menu.
2. Select 6 (I/O Point Control).
3. Select the Module the point is on.
4. Enter the point number, or press the up or down arrow to select the point you wish to test, then press ENTER.
5. Press ENTER to generate an alarm for an input point or activate an output point.
6. To exit press the left arrow key.

12.5 Impedances that Cause Earth Ground Faults

Table 12.1 show the minimum impedances that cause an earth ground fault on this system.
(values in ohms)
NAC 1 -
NAC 1 +
NAC 2 -
NAC 2 +
NAC 3 -
NAC 3 +
NAC 4 -
NAC 4 +
SBUS -
SBUS +
SBUS A
SBUS B
SLC IN -
SLC IN +
SLC OUT -
SLC OUT +
142
Figure 12.2 Shut Down Warning
TERMINAL
high trip
0
0
0
0
0
0
0
Table 12.1 : Earth Ground Faults in Ohms
LOW BIASED
high restore
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6808 Manual — P/N LS10146-001SK-E:C 09/28/2017
HIGH BIASED
low trip low restore
0
0
0
0
0
0
0
0
0