Gree GMV5 Series - Page 363

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
360
2.1.8 Troubleshooting
2.1.8.1 Hardware Faults
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.
The communications lines are
not twisted pairs.
Replace the communication
lines with twisted pairs.
Gateway damages.
Replace the damaged gateway.
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 related instructions 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.
The serial port configured by the
software is inconsistent with that
connected to PCs.
Connect the PCs to the serial port
configured by the software or
change the serial port setting in
the software.
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.
Maybe a repeater is required. If
such a device has been
installed, maybe wiring is
incorrect.
Reinstall the repeater in a
correct manner.
A communication fault alarm is
reported, all units' running state
is not displayed,
and the TX LED on the
converter is steadily on.
Polarities of communication lines
are not distinguished or they are
connected in a wrong order.
Check communication lines for
their polarities and connect them
in a correct order.
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.
2.1.8.2 Software Faults
(1)Software Abnormalities
1. Though the username and password entered are correct, the system prompts ―Please contact the
administrator‖, as shown in the following figure: