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9.2 Introduction to the fan speed controller
The low ambient temperature cooling system realizes starting normally at the
temperature -15
the voltage of the outdoor fan motor, thus to change the fan speed. As a result, the system
pressure is restricted.
1.When the coil temperature exceeds 42 ,the voltage would be the highest value
210V and the fan motor runs in the normal way. As the outdoor temperature descends, the
condensator temperature descends too, and the pressure of the compressor discharge
lowers. The voltage of the fan motor falls along with the coil temperature. According to the
above chart (the coil temperature descends, the fan speed descends too), when the
temperature falls to 39
temperature falls continuously to 27 , the outdoor fan motor stops.
2.When the fan motor stops, the pressure of the compressor discharge rises
gradually, and also the condensator temperature. If the temperature rises to 35 , the
outdoor fan motor starts and runs in the lowest voltage 60V. If the condensator
temperature can not stop rising, when it is 39 , the fan speed will rise according to the
line in the above chart until the temperature be 42 , and then the fan motor will run in the
normal way.
1
neutral wire input1
PortA
C1
0.15u 275V
R1
220 1W
D
C3
C2
0.22u 275V
0.01U 275V
neutral wire output 2
PortC
live wire input 2
PortD
neutral wire
C7
live wire output 2
PortB
684 400V
C
C16
4-way valve input 1
Port
104 400V
R23
1K
R22
2M
B
4-way valve input 2
Port
A
1
210V
60V
27
35
by the method of: The sensor collects the coil temperature to change
, the fan motor runs in the lowest voltage 60V, and if the
2
3
R2
220 1W
SCR
R10
C5
220
R3
0.33u 63V
IC1
330K
1
1
R4
2
L1
2
330K
3
3
4
4
P5
5
5
6
6
E3
7
D1
7
10u 63V
8
8
1N4007
E4
D2
TDA1085C
220u 35V
R12
220
VCC
1N4007
temp. sensor
S2
IC3
R20
S1
470
BD
R21
2.2K
E5
4.7u 50V
VCC
R18
3.3K
VR2
R19
10K
Vref
1.2K
temperature adjusting
R24
3.3K
2
3
ELECTRICAL CONTROL FUNCTIONS
39
42
4
Pin
Explanation
1
current in-phase
E1 1u 50V
2
voltage in-phase
16
16
R11 270K
3
current restrict
15
15
4
real fan speed
C6
14
14
5
setting fan speed
47n
13
13
6
Ramp Generator
12
12
7
the output of ramp generator
11
11
8
Gnd
10
10
9
9
VCC
Vref
R26
2.2M
VR1
VCC
R25
5K
180K
8
D3
6
IC2
Port
7
5
Port
R17
1N4007
E6
OPAMP
R13
330K
4
5.6K
VCC
Vref
VCC
R28
8
R27
5.6K
33K
D6
IC2
2
R30
1
3
56K
OPAMP
R31
E7
4
680k
4.7u 50V
R29
3.3M
4
- 50 -
5
6
Pin
Explanation
9
Vcc
10
Vcc parallel connected manostat
11
F/VC Pump Generator
12
Digital Speed Sense
13
Trigger Pulse Output
14
toothed wave capacitor
15
setting current of toothed wave
16
Closed Loop Stability
VCC
VCC
R7
330k
R16
5.6K
Q2
R6
9012
330k
R8
VR3
680k
R15
5K
R5
33K
Voltage adjusting
33k
TO P5
Q1
Q3
R14
9014
9014
E2
2.2K
4.7u 50V
R9
5.6k
5
6
D
C
B
A
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