DC Fan Sensors

DC Fan Sensors

There are two types of DC fan sensors available: Locked Rotor Signal and Tachometer Signal. The lock Signal outputs the status of the fan motor and is designed to detect if the fan motor is rotating or stopped. The Tachometer Signal is designed to detect the fan speed. It is set to produce two cycles of rectangular waveforms as the fan motor makes one rotation.

Output Circuit: Alarm Signal Circuit

Output Circuit: Open Collector

Specification
Vce max : +30V
Vce max : +15V
Ic max : 5mA(Vce(sat)max=0.4V)
TTL output is an available option.

Alarm Signal Circuit

Alarm Signal Output: White, +:Red, -:Black

Output Circuit: Open Drain
Specification
VDS max : +27.6V
ID max : 5mA(Vo(LOW)max=0.5V)

Alarm Signal Circuit

Lock Signal

Output Waveform : At Rated Voltage

This Fan Motor has Three Lead Wires

Output Signal: White, +:Red, -: Black
The output signal may correspond to Case 1 or Case 2.

* The output completely becomes at VOL in less than 0.5 sec. after switch-on.

Your design should provide for both waveforms.

Tachometer Signal

Output Waveform : At Rated Voltage

T=T1+T2+T3+T4=1 Rotation, T1≈T2≈T3≈T4 60/4m   m: Rotation Speed min^-1
The output signal may correspond to Case 1 or Case 2. Your design should provide for both waveforms.

Related page