PDP-508XG
35
5678
56
7
8
C
D
F
A
B
E
4.5 OUTLINE OF THE OPERATION
4.5.1 SPECIFICATION OF THE FAN CONTROL
The internal fan cools down the MTB and Power blocks.
• The operating temperature of the fan is higher than the ambient temperature, because the sensor temperature is read by
the microcomputer.
• If the critical values for signals are displayed in the address circuit, the fan may be activated or be rotated at higher speed
in response to values lower than the set temperature values shown above.
DIGITAL Assy
IO Assy
If an emergency signal is
detected, it will be
transmitted.
The Main microcomputer
controls the IF microcomputer
as a port expander.
FAN_VCC1
Detection of
disconnection
0 to 12 V
TEMP2
FAN_NG1
FAN_ON1
FAN_CONT1
MAIN Assy
HIGH
DAC output
Shutdown caused
by high temperature
LOW
STOP
34.5 ºC 37.5 ºC 40.5 ºC 43 ºC 62 ºC
FAN_I_REG
VOLTAGE
CONTROL
TEMP2
Internal fan
IF_Ucom
Main_Ucom
Module_Ucom
R
Block diagram
Operation specifications
Notes:
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