參數(shù)資料
型號(hào): ASC7611QS24
廠商: Electronic Theatre Controls, Inc.
英文描述: HARDWARE MONITOR WITH INTEGRATED FAN CONTROL
中文描述: 五金顯示器整合了風(fēng)扇控制
文件頁(yè)數(shù): 22/40頁(yè)
文件大?。?/td> 505K
代理商: ASC7611QS24
P
P
- 22 -
Andigilog, Inc. 2006
www.andigilog.com
October 2006 - 70A05007
aSC7611
Automatic Fan Speed Control using Maximum PWM Setting
The previously described and illustrated mode had no restriction on the maximum PWM setting. It is useful to limit the
maximum PWM command sent to the fan in order to minimize the acoustic impact. The Maximum PWM setting will clamp
the automatic fan PWM command at a user selected value. The Absolute Limit setting will still cause the PWM command to
be 100% and that will remain until the temperature falls below the Absolute Limit temperature by an amount equal to the
hysteresis setting. This will minimize the acoustic impact of having a temperature moving back and forth close to the
Absolute Limit.
The Absolute Limit may be set above or below the Fan Temp Limit plus Range. The PWM value will be overridden and will
follow the hysteresis curve in either case, but the acoustic impact will be different, running the fan to 100% PWM at a lower
temperature, but enhancing the cooling effect. Absolute Limit set on the low end is shown in Figure 6. Setting it above is
shown in Figure 8.
It is important to consider the combination of Fan Temp Limit, Range, Maximum PWM and Absolute Limit and their impact
on cooling and acoustics. In addition, the capability to operate a fan from a combination of thermal zones allows a compound
linear slope to be achieved for further optimization.
Figure 7 Fan Control with Absolute Limit Set below Fan Temp Limit Plus Range
PWM set to Off
PWM 100%
less Hysteresis
Limit
(0
°
C to 15
°
C)
Range
(2
°
C to 80
°
C)
plus Range
Limit
Increasng wth Temp
PWM Duty Cycle ineary
Fan Set to Off
Temperature
Fan
Speed
Linear Control Range
Minimum
(0
°
C to 15
°
C)
PWM %
Fan Temp Limit
Fan Temp
Hysteresis
Fan Temp Limit
Absolute
PWM Duty Cyce ineary
Increasng wth Temp
PWDecreasing wth Temp
Fan Set to
Hysteresis
Maximum
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