4.8 Node Fan Unit
The node fan unit is connected to the wide range temperature type safety control unit
to suppress the temperature increase and to prevent the functional errors actions as well as
the component fatigues caused by the high temperature.
n
Configuration
L
N
100-120 VA ,
TM1
220-240 VA
,
L
N
100-120 VA ,
TM1
220-240 VA
,
PSU
CN1 FUSE
CN2
PSU
N1
N2
N1
N2
Fan unit
Power supply unit for fan unit
Power supply unit for fan unit
Figure 4.8-1 Node Fan Unit
l
Fan Unit
The fan revolution varies with the ambient temperature for two levels.
•
When the ambient temperature is higher than 35 degree C, or when the other fan is ab-
normal, the fan revolves at high speed.
• When a fan revolves at an abnormally very low speed, the abnormality can be monitored
through the SCS status management window on SENG.
Figure 4.8-2 Fan Unit
l
Power Supply Unit for Fan Unit
The power supply unit for fan unit receives the designated power supply at the input terminals
and outputs 12 V DC for running the fan.
The power output is connected to the fan unit through the backboard of the node fan unit.
The power output connector can be conveniently disconnected for replacement of the fan
power supply unit for fan unit.
<4.8 Node Fan Unit > 4-23
IM 32Q06C10-31E 4th Edition : Jan.30,2015-00
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