GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
199
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
Run
D1 D2 D3
D4 D5 D6 D7 D8
Power Running
IDU and ODU
communication
Main
system
M a i n -
system
Reserved
ODU
→
IDU
ODU
→
IDU
Inter-system
communication
System1
→
System2
System1
→
System2
If the LEDs flash, the ODU and IDUs normally communicate; if the LEDs are steadily on,
communication is faulty. Check communication lines connecting the ODU and IDUs.
NOTE:
After AP1 is replaced, you should power on the ODU and IDUs at the same time or power on
the ODU first; otherwise, ―CC does not have module‖ will be prompted and a ―C0 fault‖ alarm will be
reported by the IDUs.
(3) Master ODU engineering debug setting
Debug the entire system after master module AP1 replacement.
(4) System parameter setting
After system debug, reset system parameters. For details, refer to section 1 ―ODU Function Setting‖,
in part II, chapter III.
3.1.1.3 Cautions on Replacement of Slave ODU AP1
Before replacing slave module AP1, set DIP identical to that of the faulty AP1, check wiring, and
then power on the AP1.
3.1.2 Cautions on IDU AP1 Replacement
Before replacing IDU AP1, determine the module is a master IDU or a slave IDU.
3.1.2.1 AP1 DIP Setting and Jumper Cap Confirmation
Whatever the AP1 you replace is a master IDU AP1 or a slave IDU AP1, after it is replaced, check
original DIP setting and model.
Configure capacity DIP for the new AP1 and confirm its jumper cap, fan overload detect terminal,
and overflow detect terminal. They should be kept identical to those of the faulty AP1.
Their positions and corresponding silkscreen are as follows:
After replacing the main board of master module, the complete unit must start commissioning
again.
If the main board of slave module is replaced, there is no need to start commissioning for the
complete unit.
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