Part 3 Key Parts Maintenance; Cautions On Controller Ap1 Replacement - Gree GMV5 Series Service Manual

Part 3 Key Parts Maintenance

I. Cautions on Controller AP1 Replacement
1. Cautions on ODU AP1 Replacement
1.1 Distinguishing Master Module from Slave Module
Before replacing ODU AP1, determine the module is a master ODU or a slave ODU. They can be
distinguished based on:
①―Master module DIP state (SA8_MASTER-S)‖
Every cooling system has only one master module (set in power-off state). When a DIP is ―ON‖, the
corresponding position is ―0‖; when the DIP is ―OFF‖, the corresponding position is ―1‖. If
SA8_MASTER-S is set to ―00‖, it indicates a master module; if it is set to ―10‖, it indicates a slave module
(as shown in the figure below).
DIP setting
position
Master module state
②AP1 LED
When a master module is powered on, LED1 is displayed as ―01‖. For a slave module, LED1 is
displayed as ―02‖, ―03‖ or ―04‖ (as shown in the figure below).
1.2 Cautions on Replacement of Master ODU AP1
Before replacing master module AP1, make the following preparations:
①Master module DIP setting
Set the new AP1 identical to the faulty AP1. Note that settings must be performed when the master ODU
is powered off and they will take effect after the ODU is powered on. Settings that are performed in
power-on state are invalid.
②Communication state check
After AP1 DIP setting and all wiring, power on the master ODU AP1 and check whether D3 and D4 LEDs
are flashing. See the figure below:
Power
Power
D1
If the LEDs flash, the ODU and IDUs normally communicate; if the LEDs are steadily on, communication
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
DIP setting
position
LED1 display state
LED1 display state
Master module state Slave module state
IDU and ODU
Running
communication
ODU
Run
IDU
D2 D3
DIP setting
position
Slave module state
Or
Or
LED1 display state LED1 display state
Slave module state
Slave module state
Inter-system
communication
System1 System1
ODU
System2 System2
IDU
D4 D5 D6
172
DIP setting
position
Main
Reserved
system
M a i n -
system
D7 D8