Midea 22033010000441, Руководство по обслуживанию

Страница: 31 / 42

Service Manual , 2016-12
31 / 42
The characteristic that resistance value reduces as the temperature increases is deemed to have negative
slope or negative temperature coefficient (NTC), and such thermistor is called as NTC thermistor. The
resistance value changes sensitively with temperature and typically changes 7% ~ 3% per degree
centigrade. Sensor used in the refrigerator is NTC thermistor.
There is following computing formula for the sensor:Sampling voltage / reference voltage =
R1 / (RNTC + R1)
AD value / reference AD value = R1 / (RNTC + R1)
The reference voltage is 5V, RNTC is the resistance value of the sensor, R1 is R31\R32\R33 in schematic
diagram that is 5.1K
10.4 Fan motor circuit of the freezing chamber(None)
10.5 Refrigerator fan motor circuit (None)
10.6 Condensing fan motor circuit (None)
10.7 Damper motor circuit (None)
10.8 Resistance value of the sensor (R/T)
Tx(
℃
) R
（
KΩ
）
Tx(
℃
) R
（
KΩ
）
Tx(
℃
) R
（
KΩ
）
Tx(
℃
) R
（
KΩ
）
Tx(
℃
) R
（
KΩ
）
-30 33.81 -15 14.31 0 6.495 15 3.141 30 1.617
-29
31.85
-14
13.55
1
6.175
16
2.999
31
1.55
-28 30.01 -13 12.83 2 5.873 17 2.865 32 1.486
-27 28.29 -12 12.16 3 5.587 18 2.737 33 1.426
-26 26.68 -11 11.52 4 5.315 19 2.616 34 1.368
-25 25.17 -10 10.92 5 5.06 20 2.501 35 1.312
-24 23.76 -9 10.35 6 4.818 21 2.391 36 1.259
-23 22.43 -8 9.82 7 4.589 22 2.287 37 1.209
-22
21.18
-7
9.316
8
4.372
23
2.188
38
1.161
-21
20.01
-6
8.841
9
4.167
24
2.094
39
1.115
-20 18.9 -5 8.392 10 3.972 25 2.005 40 1.071