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Additional Special Functions

A)The output of 3rd wire Signal-Rotation Detector Function:
Suffix basic part number with "-RD" for Rotation Detector Function (DC FANS ONLY)


Lock Sensor (locked rotor alarm signal)
Lock sensors are used to detect if the fan motor is in operation or stopped.


B)The output of 3rd wire Signal-Frequency Generator Function:
Suffix basic part number with "-FG" for Frequency Generator Function (DC FANS ONLY)

Pulse Sensor (2 pulse per revolution signal) / Tachometer output

Pulse sensors are are used for detecting the rotational speed of the fan motor. If fan is locked on VH, signal stays locked. If fan is locked on VL, signal stays at VL for a few hundred MS, then moves to VH.
rated voltage



C) Temperature Control
Suffix basic part number with "-T" for Temperature for operating environments where noise and
temperature are a consideration. When the built in thermistor detects a drop in ambient
temperature, the fan rpm will decrease resulting in a lower noise level and airflow rate.
Conversely, as the thermistor detects a rise in temperature, the noise level will increase relative
to the rise in the fan's rpm's until the targeted temperature has been attained. (DC FANS ONLY)


Speed control by temperature sensor
Sofasco thermally controlled fan uses a thermistor to sense temperature. Ther thermistor can be mounted in the hub area or on the end of special length leads. The fan will operate at maximum speed if the thermistor senses high temperature and minimum speed if the temperature is low.

Between these upper and lower limits, fan speed will vary almost linearly according to temperature.


D) Dust and Water Splash Resistant as per IEC IP-5.4 Suffix basic part number with "-54" for Dust
Resistant/Water Splash Resistant. This unit is protected against splashing water (water spraying
at all angles @ 10 liters/min @ a gage pressure of 80-100kN/m2 for 5 minutes.

Dust and Water Jet Resistant as per IEC IP-5.5 Suffix basic part number with "-55" for Dust
Resistant/Water Jet Resistant. This unit is protected against water jets projected at all angles
through a 6.3mm nozzle at a flow rate of 12.5 liters/min at a gage pressure of 30kN/m2 for 3
minutes from a distance of 3 meters.

IP Protection

Protection against touching
live parts or ingress of solid objects
  Protection against
ingress of linquids
IP First figure       Second figure
No protection 0 0 No protection
Touching by hand
12mm dia. objects
1 1 Vertical water droplets
No harmful ingress
Touching by finger
12mm dia. objects
2 2 Showering at 15°
No harmful ingree
Touching by tools or
wire 2.5mm dia.
2.5mm dia. objects
3 3 Showering at 60 °
No harmful ingree
Touching by tools or
wire 1mm dia.
1mm dia. objects
4 4 Splashing from any direction
No harmful ingress
Total touch protection
no harmful ingress of dust
5 5 Water jets from any direction
No harmful ingress
Total touch protection
no ingress of dust
6 6 large volume of water
No ingress
    7 Immersion up to 1 meter deep
No ingress
    8 Submersion at specified depths
Exceeding 1 meter
No ingress

E) Current limit protection / Auto restart protection
When the fan motor is locked, the device will cut off the drive current within two to six seconds and restart automatically after a few seconds. If the lock situation is continued the device will work as cut off >restart>cut off> restart>... repeatedly till the lock is released.


F) Speed control by PWM Signal
A speed control lead can be provided that will accept a PWM signal from the customer circuit to vary the speed of the fan. The change in speed is linear by changing the Duty-Cycle of the PWM. PWM signal types are standardized as following;
Open collector type and pull-up voltage is changed by maximum operating voltage and sink currrent by consuming current.
*PWM signal function design is decided by customer.

Click HERE for more speed control information

G) Parylene Coatings

Specialty of Parylene Coating
Because the Parylene coating will be processed in vacuum chamber, and has been applied by Gaseous Precipitation, thus its protective coating quality is much greater than applied by dipping or spraying, and has no unevenness coating, no cracks of gaps. This Parylene coating has very good resistance to both acid and alkali, and has passed by US Military Standard MIL-I-46058C.