Spal FAN-PWM problem

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Apr 19, 2006 | 10:29 PM

yellow 72

Thread Starter

Le Mans Master

Joined: Apr 2000

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From: cincinnati ohio

St. Jude Donor '09

Spal FAN-PWM problem

Single 16" Spal fan, no AC, Fan-PWM wired per instructions. With the exception that I ran the blue(AC) wire to a 12 volt source with a switch so I could manually turn the fan on. When I do, the fan will run full for a few seconds then slow to a stop and hum. Should not this set up work as I'm thinking?
The car isn't running yet I just trying to get stuff up and working.

Last edited by yellow 72; Apr 19, 2006 at 10:34 PM.

Apr 19, 2006 | 10:32 PM

b71vette

Burning Brakes

Joined: Jan 2004

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From: Va

According the SPAL Contoller manual the fan should run 100% with a 12 volt source applied to the blue wire. I have the dual spals and I have tested this.
If you purchased it from Dewitt's give Tom a call.

Apr 19, 2006 | 11:55 PM

SIXFOOTER

Le Mans Master

Joined: Jan 2006

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From: Boca Raton Florida

put 12 volts straight to the motor and see what it does. If it runs, the controller is bad

Apr 20, 2006 | 04:56 AM

yellow 72

Thread Starter

Le Mans Master

Joined: Apr 2000

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From: cincinnati ohio

St. Jude Donor '09

Quote:

Originally Posted by SIXFOOTER

put 12 volts straight to the motor and see what it does. If it runs, the controller is bad

12 volts direct to the fan it runs fine.............

Apr 20, 2006 | 07:04 AM

gavanm01

Pro

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May be a coincidence, but I just got a bad sensor unit (the dohicky just off the top of the thermostat) from a DeWitt relay unit. Runs fine without it. Soon as I wade through my paperwork I'm sending the dohicky back.

Apr 20, 2006 | 08:39 AM

SIXFOOTER

Le Mans Master

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From: Boca Raton Florida

well there ya go, controller is hosed, are there other parts to the system? controller, sensors, etc?

Apr 20, 2006 | 08:52 AM

yellow 72

Thread Starter

Le Mans Master

Joined: Apr 2000

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From: cincinnati ohio

St. Jude Donor '09

Like I said, car isn't running yet. I'm testing the stuff I can before I fire it. I assumed the fan would run in that mode even if the coolant was cold. Wanted someone here to confirm it

Apr 25, 2006 | 07:32 PM

0Tom@Dewitt

Former Vendor

Joined: Jan 2000

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From: Brighton

Quote:

Originally Posted by yellow 72

Like I said, car isn't running yet. I'm testing the stuff I can before I fire it. I assumed the fan would run in that mode even if the coolant was cold. Wanted someone here to confirm it

I got the controller and sent it back to SPAL. I discussed it with the tech support people and they said it sounded like a voltage drop off. Maybe your test introduced 12v at first but then it dropped to a lower voltage when the fans kicked on. They're going to test it and let me know