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PART III MAINTENANCE
1.COMMON TROUBLESHOOTING OF BMS
SYSTEM
Malfunction
According to the protocol provided, BMS
system will display communication
malfunction warning, but operation status of
some or all units cannot be shown, neither
conduct any control
Circuit inspection is in good condition, but
no information displayed in all or some
units, communication malfunction still exists
in the software
Circuit, equipment and engineering
installation inspection is in good condition,
communication malfunction still exists in
the software
GMV BACnet Gateway Technical Service Manual
Twisted pair communication cord
BACnet gateway is damaged
Communication cord is
Communication cord short circuit
The twisted-pair and
communication cord is too close
communication malfunction
occur due to disturbance
Connection of communication
After replacing the chip or
re-dial-up the ODU and before
re-energizing the unit, it is not
Matched resistance is not
communication software is
inconsistent with that connected
Unit address added in the
software is inconsistent with that
The unit is not energized
Forgot to insert chip in ODU or
IDU, or insert direction of chip is
opposite with the actual direction
Unit address is wrong or
Displayer or controller which is
inconsistent with actual unit is
Possible reason
is not used
disconnected
(less than 15CM),
interface is wrong
power off.
connected
Series port used in
to the computer
of actual unit
repeated
adopted
16
Troubleshooting
Change to twisted pair
communication cord
Replace the BACnet gateway
Weld the disconnected circuit
Maintain the short circuit parts
Conduct separate wiring for
these two wires, consider to
add shielded steel tube if the
separation distance cannot be
over 15CM
Connect it according to the
specification in this manual
Re-energize the unit
Conduct correct setting to the
matched resistance
Replace series port or change
the series port in the software
Revise the address setting in
software unit
Energize the unit
Reinspect the plug-in chip,
insert it in the direction of the
gap in PCB, and re-energize it.
Revise the wrong unit address
setting
Check the specification of
current controller and wired
controller and replace it if not
consistent.