Loop 'Positive Line' Break Test; Loop 'Earth Fault' Tests - Honeywell GENT Nano panel-based Commissioning Instructions

Commissioning instructions

Loop 'Positive line' break test

A positive line break test should be carried out at this stage. A single +ve line break should not
cause the loss of any part of the system. If the test is unsuccessful then after the rectification work
is complete, re-allocate the loop circuit by using the 'Power-Down' and 'Power-Up' functions
followed by 'Start Detection'.
¨
Disconnect the +ve line connection at one End-1 of the loop circuit. The display will
show a wiring changed message with location of device where the positive break was
found.
¨
If necessary run the 'Repair' function to clear the system.
L1 (+ve)
LINE
BREAK
TEST
LOOP END 1
L1 0V
DRN
PB1
32
PANEL
enclosure
BOARD
TERMINALS

Loop 'Earth fault' tests

Earth fault tests should be carried at this stage:
PANEL
enclosure
LOOP END 1
L1 0V
DRN
PB1
0V-line earth fault test
¨
Connect the 0V line to the earth of the control panel. This may have to be sustained
for up to 1 minute for the fault to be detected. The display will show an 'Earth fault'.
¨
Restore the wiring and the display will show 'Earth Fault cleared'.
+ve line earth fault test
¨
Now connect the +ve line to earth via a 10K ohm resistor. This may have to be
sustained for up to 1 minute for the fault to be detected. The display will show an
'Earth fault' message and after restoration of the wiring a cleared message is
displayed. If the resistance between 'Earth' and 'Loop +ve' is in the order of a few
ohms then this will be registered as a 'short circuit'.
Type of earth fault
Interrogate the Diagnostics and check the readings given for Earth fault.
Type of Earth fault Earth (Ear) reading
No earth fault around 89
+ve line and earth around 75
-ve line and earth less than 40
PANEL
enclosure
10K
LOOP END 1
resistor
L1 0V
DRN
PB1
TERMINALS
4188-949 issue 3_05/10_Nano Comms inst.