18
The self test is a function of the BD1.4F-AUTO electronic, which indicates if the entire box is working
properly.
The idea is it to get a fixed delta in temperature during a fixed time period.
Both the time period and the delta in temperature are flexible.
The temperature in the box is measured before the compressor starts with NTC1. Then the compressor
starts and runs for the fixed time period. The compressor stops and the box temperature is measured
again NTC1 and compared to the start temperature, determining if the box has cooled sufficiently.
To avoid interference on the test due to high ambient temperature, the ambient temperature is also
measured with NTC2 before the start of the test. The maximum limit for the ambient temperature is fixed
at 30 °C.
The self test will begin when both push buttons are pushed at the same time for 3 seconds or using
TOOL4COOL®.
The self test may be cancelled at anytime by pressing both push buttons. When nothing is pushed it will
disappear 6 min after the test has finished.
The status of the Self diagnostic is shown on the LED´s of the MMI
0.5 Hz both LED´s Performing self test
Both LED´s fully ON status ok
5 Hz both LED´s flashing status not ok
5 Hz left LED flashing supply voltage not ok
5 Hz right LED flashing ambient temperature not ok
Self test / diagnostic
Settings
Measurements
16.
SELF TEST / DIAGNOSTIC
Name Default Max value Min value Step Unit
Time to reach the
delta temperature
300 1200 10 1 s
Delta temperature for
self diagnostic
5 30 1 1 Kelvin (K)
Start self diagnostic 0 1 0 1
Name Description Step Unit
Result diagnostic Outcome of self test
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