Airwell YAZE218, Service Manual

Page: 35 / 78

11—4 | SM YAZE218 1-A.2 GB
11—CONTROL SYSTEM
11.3.2.2 ‘Bad Communication’ fault
The system keeps a balance of a good/bad communication packet ratio for each active
communication channel. When the ratio getting high , system enters ‘Bad Communication’ fault.
11.3.2.3 ‘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 system will act as following:
● If there is no communication in all channels, the following will be performed:
1. The unit changes to SB.
2. The system will scan all the communication.
3. Each channel that is identi ed as ‘no communication’ channel will be referred as
STBY unit.
4. The unit resumes its normal operation with only the operative channels.
11.3.3 Temperature Measurements
11.3.3.1 Thermistor failures de nition
Thermistor Type a – Disconnected Type b – Shorted
OAT Temp < -30°C Temp > 75°C
OCT Temp < -35°C Temp > 75°C
CTT Temp < -30°C Temp > 125°C
HST Temp < -30°C Temp > 125°C
OMT Temp < -35°C Temp > 75°C
ICT Temp < -30°C Temp > 75°C
RGT Temp < -30°C Temp > 126°C
RLT Temp < -30°C Temp > 126°C
11.3.3.2 System responses for different thermistor failure
Thermistor Default value System Reaction
OCT 43°C
OAT 6°C
CTT 43°C Compressor is stopped.
OMT 43°C Compressor is stopped in cooling mode.
HST 43°C Compressor is stopped.
RGT 43°C
RLT 43°C
ICT 43°C
11.3.4 Flash Memory Programming
In order to upgrade the ODU software the auxiliary port will be used. A special application
should be run on a PC to transmit the new rmware. Special programmer (Panasonic) should
be used to update the S/W.