Gree GMV BACnet

GMV BACnet Gateway Technical Service Manual
16
PART III MAINTENANCE
1.COMMON TROUBLESHOOTING OF BMS
SYSTEM
Malfunction
Possible reason
Troubleshooting
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
Twisted pair communication cord
is not used
Change to twisted pair
communication cord
BACnet gateway is damaged
Replace the BACnet gateway
Communication cord is
disconnected
Weld the disconnected circuit
Communication cord short circuit
Maintain the short circuit parts
The twisted-pair and
communication cord is too close
(less than 15CM),
communication malfunction
occur due to disturbance
Conduct separate wiring for
these two wires, consider to
add shielded steel tube if the
separation distance cannot be
over 15CM
Connection of communication
interface is wrong
Connect it according to the
specification in this manual
Circuit inspection is in good condition, but
no information displayed in all or some
units, communication malfunction still exists
in the software
After replacing the chip or
re-dial-up the ODU and before
re-energizing the unit, it is not
power off.
Re-energize the unit
Matched resistance is not
connected
Conduct correct setting to the
matched resistance
Series port used in
communication software is
inconsistent with that connected
to the computer
Replace series port or change
the series port in the software
Unit address added in the
software is inconsistent with that
of actual unit
Revise the address setting in
software unit
The unit is not energized
Energize the unit
Forgot to insert chip in ODU or
IDU, or insert direction of chip is
opposite with the actual direction
Reinspect the plug-in chip,
insert it in the direction of the
gap in PCB, and re-energize it.
Unit address is wrong or
repeated
Revise the wrong unit address
setting
Circuit, equipment and engineering
installation inspection is in good condition,
communication malfunction still exists in
the software
Displayer or controller which is
inconsistent with actual unit is
adopted
Check the specification of
current controller and wired
controller and replace it if not
consistent.