Temperature Compensation And Over-Cool/Weak- Cool Compensation Circuit; Temperature Compensation At Freezing Room, Cold Storage Room - LG GR-B207WVQ.CSWQAGE Service Manual

EXPL A TION FOR MICOM CIRCUIT
Explanation) For driving method of the stepping moto
PIN 33, 34 and 35 as shown in wave form of the following part.
These signals are output to the output terminal (No.10,
IC10 ( TA7774F) as IC for motor driving. Output signals allow motor coi
form rotation magnetic field and the motor to rotate. Inputting as below figure to the input terminal (INA, INB)
as IC ( T A7774AF) for motor driving allows motor coils wound on each phase of stator to form rotation
magnetic field and the stepping motor damper to rotate

1-8. Temperature compensation and over-cool/weak- cool compensation circuit

1. Temperature compensation at freezing room, cold storage room

Freezing room
Resistance value (RC F 1 ）
180 k Ω
56 k Ω
33 k Ω
18 k Ω
12 k Ω
10 k Ω
8.2 k Ω
5.6 k Ω
3.3 k Ω
2 k Ω
470 Ω
Temperature compensation table by adjustment value (di
Ex) If changing compensation resistance at a cold storage room (RCR1) from 10 k
(modified resistance), temperature at the cold storage will increase by +1
r , send signals in the cycle of 3.33 mSEC using terminal of MICO
(Reverse rotation )
冷藏室温度补偿
冷冻室温度补偿
Temperature
Resistance value (RC F 1 ）
compensation
+5 °C
180 k Ω
+4 °C
56 k Ω
+3 °C
33 k Ω
+2 °C
18 k Ω
+1 °C
12 k Ω
0 °C
10 k Ω
-1 °C
8.2 k Ω
-2 °C
5.6 k Ω
-3 °C
3.3 k Ω
-4 °C
2 k Ω
-5 °C
470 Ω
f ference value against current temperature)
- 18-
11, 14, 15) via the input terminal (No. 3, 6, 8) of the
ls wound on each phase of stator to
(Positive rotation)
Refrigerator room
Temperature
compensation
+2.5 °C
+2.0 °C
+1.5 °C
+1.0 °C
+0.5 °C
0 °C
Reference temperature
-0.5 °C
-1.0 °C
-1.5 °C
-2.0 °C
-2.5 °C
Ω (current resistance) to 18 k
°C.
M
Remarks
Warmly
compensate
Coolly
compensate
Ω