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CURRENT DERATING vs. AMBIENT TEMP.
% Rated
Current
100%
80%
60%
40%
20%
10
20
30
Ambient Temperature C°
Figure 1
Specifications
S
Power Source: 95−125 VAC
S
Frequency: 47−64 HZ
S
Current Ratings: 2 AMPS
S
Storage Temperature: −40ºC to 125ºC
S
Operating Temperature: −40ºC to 70ºC
SETTING CONTROL MODES
The AFANTSC can automatically control air temperature
by proportionately increasing or decreasing fan speed as
required.
Fan On / Fan Off Feature (switch #1)
To turn the fan(s) off below the set idle speed (see table 3),
set switch 1 to the ON (down) position. To keep the fans
running at idle speed below the set idle speed, set switch
1 to the OFF position.
Setting Idle Speed (switch #2,3)
The idle speed is the minimum voltage (as a % of supply
voltage) supplied to the fan. The AFANTSC can be set for
idle speeds of 30, 40, 50 and 60% by setting DIP switches
2 and 3. The default idle setting is 50%.
Table 1: Idle Speed DIP Switch Settings
% of Supply
% of Supply
Voltage
30%
40%
50%
60%
Control Temperature (switch #4,5)
The control temperature is the point above which the fans
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40
50
60
70
80
DIP Switch
2
3
ON
OFF
OFF
ON
OFF
OFF
ON
ON
E 2004 Hoffman Enclosures Inc.
will run at full speed (T
). The AFANTSC can be set to
C
control fans at 30, 35, 40 or 45°C by setting DIP switches
4 and 5. The default setting is 35°C.
Table 2: Control Temperature DIP Switch Settings
Control Temperature (T
)
C
T
(°C)
T
(°F)
C
C
30
86
35
95
40
104
45
113
Control Temperature (switch #6)
The temperature slope (T
S
between idle speed and full speed. The slope can be set
at 4°C or 10°C by using DIP switch 6. The default setting
is 4°C.
See figure 1.
Table 3: Temperature Slope DIP Switch Settings
Temperature Slope (T
T
(°C)
T
S
4
10
RMS FAN VOLTAGE vs. TEMPERATURE
VAC
100%
80%
FAN ON
60%
40%
20%
T
Figure 2
DIP switch
4
5
OFF
ON
OFF
OFF
ON
OFF
ON
ON
) is the temperature difference
)
DIP switch
S
(°F)
6
S
7
OFF
18
ON
FAN OFF
− T
C
S
T
C
− 3 −
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