IEI Integration NOVA-HM551 v1.10 - Manual (Page 35)

NOVA-HM551 5.25" SBC
Page 21
Figure 3-5: CPU Fan Connector Location
Pin Description
1 GROUND
2 +12V
3 CPUFANIN
4 CPUFANOUT
Table 3-6: CPU Fan Connector Pinouts
3.2.5 Fan Connector (System)
CN Label: SYS_FAN1
CN Type: 3-pin wafer (1x3)
CN Location: See
6
Figure 3-6
CN Pinouts: See
6
Table 3-7
The cooling fan connector provides a 12V, 500mA current to the cooling fan. The
connector has a "rotation" pin to get rotation signals from fans and notify the system so the
system BIOS can recognize the fan speed. Please note that only specified fans can issue
the rotation signals.