VSX-C100-S
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D
F
A
B
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7.1.3 Operation of the Fan-Control Line
FAN Driver
Q404
2SC2712(GRBL)
Q405
DTA124EK
Q403
2SC2712(GRBL)
Q406
DTA124EK
1SS355
FAN Drive
+12V
GNDRY
IC4201
PDG269A
CN306
TERMO
DTC
V+5
1. Temperature detection of the heat sink
The detection is performed every 1 second by taking in the voltage of the thermistor at A/D (PORT 31).
2. Perform the following operation by detection temperature
• If you wish to switch FAN START from "H" to "L" and FAN MAX from "L" to "H," first set FAN START to "L," then after 100
µ
s, set
FAN MAX to "H."
• While "OVERHEAT" is flashing, only the POWER key is functional.
3. FAN operation
• Once the fan starts rotating, it continues to rotate at the same speed until the temperature falls to 65
°
C.
• Once the fan starts rotating, it continues to rotate for at least 20 seconds even after the temperature falls to the above-mentioned level.
4. Detection of abnormalities in the fan
• If any abnormality is detected in the fan 5 seconds after it starts rotating at high speed, and if H (abnormal) is indicated for the FANDCT
connector, "FAN STOP" is displayed for 5 seconds, then the power is turned off.
• While "FAN STOP" is displayed, AMUTE is on, and RELAY is off.
• While "FAN STOP" is displayed, only the POWER key is functional.
• While the fan is rotating at low speed, abnormality detection is not carried out.
5. Abnormality in the thermistor
If an abnormality (A/D voltage: 0.1 V or less) is detected in the thermistor, "THDCT NG" is displayed for 5 seconds, then the power is
turned off.
THRMO DCT
(pin 31)
A/D Setting Voltage
FAN LOW
(pin 51)
FAN HIGH
(pin 52)
SP RELAY
(pins 48-50)
AMUTE
(pin 53)
Display
0 to 0.1V
< 5
L
L
L
L
"THDCT NG" flashes for 5 seconds.
0.1V to 2.4V
5 to 122(60
°
C)
L
L
H
H
2.6V to 2.8V
(70
°
C)134 -
H
L
H
H
2.8V to 3.4V
(75
°
C)145 -
L
H
H
H
3.4V to 4.1V
(90
°
C)174 -
L
H
H
H
"HEAT UP" flashes for 5 seconds at 20-
sec intervals.
4.0V -
(110
°
C)204 -
L
H
L
L
"OVERHEAT" flashes
Note: Pin No. shows pin No. of IC4201 (PDG269A).
FAN HIGH
FAN LOW
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