CPCI PICMG 2.16 10 U
1.6
3.2 Fan Control Modul (FCM)
The Fan Control Module, based on a microcontroller, monitors up
to 4 DC fans rotation speed depending on the temperature.
Up to 4 temperature sensors (NTC) can be connected.
It controls the theoretical speed value of each fan.
If the fan speed falls below the theoretical value or by cable
damage or by temperature sensor cable short-circuit, an alarm is
generated and the fans rotate at their maximum speed.
The FCM has a CMM connection (I2C-bus) for remote alarm
signal and for individual configuration of the FCMs.
Block diagram:
10002501
Fan speed characteristics:
+3.3V monitor in
+12V monitor in
-12V monitor in
υ
υ
υ
υ
I2C bus to CMM
I2C bus
Voltage fail + 5V LED
Voltage fail +3.3V LED
Voltage fail +12V LED
Voltage fail –12V LED
Digital input 1
Digital input 2
Digital input 3
Digital input 4
Fan Fail LED
Over Temp LED
Over Temp digital output
Fan Fail digital output
Filter
NTC 1
NTC 2
NTC 3
NTC 4
Fan 1
Fan 2
Fan 3
Fan 4
5V Module power
µ
C
Driver
Fan speed characteristics
Fan speed
(%)
υ
(°C)
100
60
25
50
60
Over Temp
Alarm
Connectors assignment:
X1:Connector for signals and power supply
X2:Connector for temperature sensors and digital inputs
Designation
Terminal
Fonction
12V
1
Power for fan;
Current: 3A
-12V
8
Ground for fan
Current: 3A
12V
2
LED display
-12V
9
LED display
3,3V
3
LED display
5V
10
Power for logic
current: 0,5A
GND
11
Ground for logic
current: 1A
Temp Fail
collector
4
Signal out
Temp Fail
emitter
5
Signal out Ground
Fan Fail collector 6
Signal out
Fan Fail emitter
7
Signal out Ground
CMM BUS SCL
13
Communication Bus
CMM BUS SDA
12
Communication Bus
CMM BUS GND 14
Communication Bus
Designation
Terminal
Fonction
Digital in1 TTL
7
Signal in
Digital in2 TTL
8
Signal in
Digital in3 anode 9
Signal in
Digital in3
cathode
10
Signal Ground
Temp1 +
1
Temp sensor
Temp1 -
2
Temp sensor
Temp2 +
3
Temp sensor
Temp2 -
4
Temp sensor
Temp3 +
5
Temp sensor
Temp3 -
6
Temp sensor
