Service manual

12-6
CONTROL SYSTEM
SM CINCO 1-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 Number of connected IDUs
The number of detected indoors must be equal or less than 5 (Max_IDU_Number), if it is above that number, the
system will be forced to Idle and report “
Mismatch between IDU and ODU models”
12.3.3.3 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