Gree GMV-224WM/B-X, Service Manual

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GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
308
By default, ―A7‖ is displayed.
LED1 LED2 LED3
Function code Display mode Current progress Display mode Current state Display mode
A7
Flash
00 Flash 00 Flash
2. Press SW2 (▼) on the master
ODU to select the function code n5 (setting of IDU number
offset) and press SW7 to confirm. The following is displayed:
LED1 LED2 LED3
Function code Display mode Current progress Display mode Current state Display mode
n5
ON
00 Flash 00 Flash
3. While number offset waits for being confirmed, press SW7 to enter number offset state.
―Press SW7 to confirm" is displayed.
LED1 LED2 LED3
Function code Display mode Current progress Display mode Current state Display mode
n5 ON 00 ON 00 ON
In this case, all IDU numbers will be automatically offset. One minute later, conflict is
addressed and the system returns to normal. The offset can be set on only the master ODU
whose centralized control address is 0.
Note: If the quantity of conflict IDU numbers is not large, you are advised to manually set
them using Gree Debugger, control panel, or remote control. Manual setting is applicable to
intra-ODU conflicts only, not affecting numbers of other IDUs. If the quantity is large,
automatic offset is recommended, which is easy to realize. However, numbers of normal
ODUs may be altered. Automatic setting is applicable to initial installation and debug.
7.2 Communication Debug Between Modbus Gateways and Air Conditioning Units
Step 1: Set matched resistance of CAN2 bus.
ODU system 2
Master outdoor unit 1
ODU system 16
Master outdoor unit 1
ODU system 1
Master outdoor unit 1
……
With the matched
resistance
With the matched
resistance
Without the
matched resistance
Without the
matched resistance
CAN2 bus
Master ODU of Master ODU of Master ODU of
ODU system 1
ODU system 2 ODU system n
ODU system 2
Master outdoor unit 1
ODU system 16
Master outdoor unit 1
ODU system 1
Master outdoor unit 1
……
With the matched
resistance
With the matched
resistance
Without the
matched resistance
Without the
matched resistance
CAN2 bus
As shown in the preceding figure, the master ODU and the Modbus gateway at both ends of the CAN2
bus need to be configured with matched resistance.
The following figure shows how to set matched resistance on the Modbus gateway at the end of the
CAN2 bus:
8
With
matched
resistance
configured
Without
matched
resistance
configured
8
indicates the position
of toggle switch
Function
1 6 5 4 3 2 7 8
0
1
0
1
The following figure shows how to add matched resistance on the master ODU: