Gree GMV5 Series - Page 412

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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2.2.7. Troubleshooting
2.2.7.1 Hardware Faults
Symptom
Possible Cause
Troubleshooting
A software
communication fault
alarm is reported, and
some or all units' running
state is not displayed or
cannot be controlled.
Communication lines of units are not
twisted pairs (except for lines
connecting BACnet gateways and PCs,
other communication lines must be
twisted pairs).
Replace the communication
lines with twisted pairs.
Communication lines are loose; or
polarities of communication lines
connecting BACnet gateways and
ODUs whose control DIP switches are
0 are reverse (G1, G2 reverse).
Connect the gateways and
ODUs in a correct way; make
sure their polarities are
correspondent, that is, G1 to G1
and G2 to G2.
Communication lines connecting ODUs
and IDUs interrupt.
Weld the interrupted lines.
Communication lines interrupt.
Weld the interrupted lines.
Communication lines are short
circuited.
Repair the short circuited part.
Twisted pairs are too close to the
power lines (less than 15 cm
clearance), resulting in disturbance that
affects communication.
Separate the two types of lines.
If their clearance is less than 15
cm, cover them with sheath
separately.
Communication interface connection
error
Refer to the BACnet Technical
Manual to connect the
communication interfaces.
Though lines are normal,
a software
communication fault
occurs and some or all
units' information is not
displayed.
ODUs, after being replaced with chips
or reset with DIP, are not re-powered
on.
Re-power on the ODUs.
Matched resistance is not configured.
Refer to the network topology in
the BACnet Technical Manual to
configure matched resistances.
After gateway IP addresses are
modified, the gateways are not
re-powered on.
Re-power on the gateways.
The unit address configured by the
software is inconsistent with the actual
address of units.
Modify unit address settings.
Units are not powered on.
Power on the units.
ODUs or IDUs are not equipped with
chips, or chips are inversely installed.
Install the chips in a correct
direction and power on the units.
Unit address is incorrect or replicate.
Correct the incorrect address
settings.
Though lines and
devices are normal,
information of devices of
a floor is not displayed.
The maximum distance between a
gateway and its directly connected
ODUs exceeds 500 m.
Control the distance within
500m.
The number of the first unit is incorrect.
Refer to the BACnet Technical
Manual to reset the number.
Lines, devices, and
setups are all normal.
However, a software
communication fault
alarm is reported.
The display or controller does not
match units.
Check the models of the
controller and operation panel. If
they do not match unit
specification, replace them.