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  #1  
Unread 07-20-2016, 08:25 PM
Efi69Cam Efi69Cam is offline
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Default Spal fan wiring questions

Has anyone wired dual Spal fans in the series/ parallel arrangement with three relays for two speeds with both fans going at the same time?
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Unread 07-20-2016, 08:37 PM
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jwillia2 jwillia2 is offline
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I just went through this
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Unread 07-21-2016, 08:29 AM
Efi69Cam Efi69Cam is offline
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Thanks for the diagram, its easier to decipher than the service manual.

Have you run spal fans in series? What I'm a bit concerned about is whether or not the motors are good running on 6 to 7 volts.
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Unread 07-24-2016, 02:40 PM
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Quote:
Originally Posted by Efi69Cam View Post
Thanks for the diagram, its easier to decipher than the service manual.

Have you run spal fans in series? What I'm a bit concerned about is whether or not the motors are good running on 6 to 7 volts.
i don't see any issues. also they made a variable speed controller for their fans thats doing the same thing. just reducing the voltage to slow them .
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Unread 03-16-2017, 10:26 AM
roger1 roger1 is offline
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Quote:
Originally Posted by jwillia2 View Post
i don't see any issues. also they made a variable speed controller for their fans thats doing the same thing. just reducing the voltage to slow them .
PWM controllers like the Spal sells don't reduce voltage to control motor speed. Pulse Width Modulation is a controlled high speed switching control that varies the amount of on/off time (pulse width) to the motor.

That said, I don't believe lowering the voltage to a brushless DC motor reduces it's life. Like has been pointed out before, GM used a series/parallel system for 2 speed operation for may years.
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Unread 03-16-2017, 03:15 PM
130fe 130fe is online now
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Does anyone have a good schematic for wiring in 2 fans (with PCM fan triggers) and a trinary switch using 3 relays?
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