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12-8
CONTROL SYSTEM
SM DLSDCI 3-A.1 GB
12.3.2
Communication with Indoor Unit
12.3.2.1 Communication Failures Definition
12.3.2.1.1 ‘Bad Communication’ fault
The system keeps a balance of a good/bad communication packet ratio. When the ratio becomes high the system
enters ‘Bad Communication’ fault. The system recovers from that fault when the ratio becomes small again.
When in ‘Bad Communication’ fault, system continues its normal operation and fault code is shown in diagnostics.
12.3.2.1.2 ‘No Communication’ fault
If no legal transmission or no message received for 30 seconds, system enters ‘No Communication’ fault.
When in ‘No Communication’ fault, the fault code will be shown in diagnostics. In this case, the system will force the
compressor to off.
The system will recover from ‘No Communication’ fault when counter is below 10 and legal massage is received.
1. For the single split communication channel, whenever there is loose in the communication channel,
the ODU unit will be forced to Idle mode.
2. For Multi split communication channel,
IDUs messages
Does DMSMP
Message exist?
ODU report ‘no-
communication
ODU force to Idle
All IDUs Loose comm.
No
Yes
Yes
All IDUs Loose comm.
Yes
No
Yes
Some IDUs loose comm.
Yes
No
No
The IDU channel Lost
communication will be defined as
inactive channel.
12.3.3
System Configuration Test
This test is continuously performed while the system is on:
12.3.3.1 Communication Channel Auto Detection (Single or Multi)
System is continuoesly checking wether it is a single or multi system according its 2 seperate communication lines.
Case
Single split
Channel
Multi Split
Channel
Fault
Action
1 (Normal)
Detected
Not detected
No Fault
Continue to the next step
2 (Normal)
Not
Detected
Detected
No Fault
Continue to the next step
3 (Abnormal) Not
Detected
Not Detected
‘No Communication’
Present Fault under the HMI.
Unit is forced to Idle mode.
4 (Abnormal) Detected
Detected
‘Mismatch between
IDU and ODU models’
12.3.3.2 Model Plug & Indoor Capacity Test
Test
How to check?
Error to report?
System Action
(ODU Mode)
Jumper is inserted/
DIP is configured
ODU model is 0 (zero).
“Missing ODU
configuration”
Force to Idle mode.
Jumper/DIP is
not defined in the
software
ODU model is not defined
“Undefined ODU model”
Force to Idle mode
IDU-ODU capacity
group mismatch
When ODU model is
defined but the capacity
group is not allowed.
“Mismatch between IDU
and ODU models “
Force to Idle mode