Honeywell Notifier ID3000 Series Installation & Commissioning Manual page 80

Important Information: Tests
Some of the tests will cause disturbance to the
network communications. In some cases the fire
cover may be compromised. Tests marked
not be carried out without adequate alternative fire
cover being provided for the area supervised by the
host panel under test.
In addition, tests which disturb the network
communications may cause all related network
devices to enter their fault warning condition. Site
staff should be made aware of this before any tests
are carried out, and should be informed when tests
are complete. Any automatic fault routing equipment
should be disconnected or disabled and the
monitoring centre should be informed.
Do not look directly into the light
from the fibre optic cable or
ID3000 Series Installation & Commissioning Manual
must
transmitter
A4 - 9
5 Hardware Tests
5.1 Wiring Reversal Check
Check the wiring for correct polarity. If the wiring
is reversed or partially connected the network
will attempt to operate at a reduced level in a
fallback mode. It is important to avoid this
because it may limit the maximum data
throughput. You should:
1 Use colour-coded cable for the network
wiring and ensure that the same colours are
used for the A and B conductors on every
link. If MICC cable is used it must be suitably
tagged. In either case ensure that the A and
B conductors are connected to the correct
terminals.
2 If there is any doubt, for each link in turn:
i Disconnect the network connector at the
NGM PCB in the panel at the end of the
cable being measured.
ii Use a Voltmeter to measure the voltage
across the A and B terminals of the plug
(i.e. measure across the cable, NOT the
NGM PCB). 'A' should be positive with
respect to 'B' (typically a 0.2V to 0.6V pulse
will be observed). If 'A' is negative with
respect to 'B', the connections are reversed.
iii Reconnect the terminal block.
5.2 Fibre Reversal Check
WARNING: Although the light generated by
the fibre transmitter is invisible
to the naked eye, it is possible
(although unlikely) that it could
cause damage, especially if
focussed by a lens. Do not
attempt to look directly into the
transmitter or fibre end.
Use an optical power meter (e.g. Fluke
FOM) to verify that the fibre connected to RX at
the end being measured is connected to a
transmitter at the far end. Connect the fibre
cable to the meter:
a. If this cable is transmitting (i.e. connected
to TX at the other end), the reading pulses
up and down, typically in the range -20 to
-30dBm. Connect this cable to RX (lower
connector on the fibre-optic PCB) at this end.
b. If this cable is not transmitting (i.e.
connected to RX at the other end), the
reading is steady and very low (below
-50dBm). Connect this cable to TX (upper
connector on the fibre-optic PCB) at this end.
997-274-000-6, Issue 6
September 2009