SPAL Brushless Fans

Note: The quantity in stock updates each night at midnight. This doesn't include any orders that we've taken throughout the day.

Important! The EASIEST solution to running a brushless fan is to use Spal's sensor and harnesses to operate it. The fan connects to the SBL-YAZ-PT10 which connects to the SBL-TS-HARN which connects to Spal's temperature sensor. This makes the fan have a variable speed. As the engine gets hotter, the fan spins faster.

Any of Spal's brushless fans can be run off any low current negative grounding PWM Pulse Width Modulation controller. The fan uses a "negative" or "grounding" type PWM. This means that the fan supplies the high +12V portion of the PWM square wave and the controller or ECU provides the low, ground, or zero volt portion of the square wave.

The white signal wire coming out of the SBL-YAZ-PT10 harness connects to the output from the ECU/PWM. The white signal wire is very low current and typically pulls 5 mA (0.005 Amps). The main current loads will be on the red and black wires on the SBL-YAZ-PT10 harness. Kartek and Spal do NOT have a wiring diagram for an ECU or PWM. Again, Spal's sensor is the EASIEST method to control these fans.

SPAL Brushless Fan PWM Requirements:

Spal brushless fans engine ECU PWM pulse width modulation requirements
    Considering a positive logic duty cycle definition:
  • Continuous low voltage is 0% duty cycle (dominant level)
  • Continuous high voltage is 100% duty cycle (recessive level)

This diagram shows how the fan will respond to varying duty cycle:

Spal brushless fans engine ECU PWM pulse width modulation chart
Note: Not all SPAL brushless fans use this response curve, but this is the most common. If you have questions contact SPAL technical support and be sure to include the part number of the fan you're using.

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