Airwell AWAU-YDDE009-H11, Service Manual

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12-13 SM HDDE 1-A.1 GB
CONTROL SYSTEMS
12.11.12 IPM module protection
After compressor is turned on, Once IPM modular protection signal (by its current or
temperature )is detected, the unit will stop operation immediately.
If modular protection is resumed and compressor has stopped for 3min, the complete unit
can then be allowed to resume operation.
If the unit stops operation due to modular protection for 3 times successively, the unit
can’t
resume operation automatically and show error code H5 , except pressing ON/OFF button.
* If compressor has operates for more than 10 min successively, the counter will be cleared.
12.11.13 Modular overheating protection (HST overheating protection)
Protect the IPM modular by reducing compressor frequency or stop compressor according
to the Module temperature (HST)
When HST>=80C, compressor frequency will be decreased or stopped increasing.
When HST>=95C, the unit will stop. (Back to normal when HST>87C and Comp OFF
time >3mins.)
If the unit stops operation for 6 times, the unit ca
n’t resume its operation and show error
code P8 . Only press ON/OFF button can resume the operation.
* If compressor has operates for more than 10 min successively, the counter will be cleared.
12.11.14 Sensor Failure
When the temperature sensor is detected short circuit or open circuit for 5s successively,
the unit will stop operation, and error code will be shown accordingly.
Error code of Sensor:
F1
– RAT Sensor Failure
F2
– ICT Sensor Failure
F3
– OAT Sensor Failure
F4
– OCT Sensor Failure
F5
– CTT Sensor Failure
ICT sensor failure will not be detected during ODU deicing stage. It starts detecting
the sensor failure after deicing is finished for 5 mins.
Other sensor failure will be detected at any other time.