amg Posted October 16, 2017 Report Share Posted October 16, 2017 Hello, I want to find out if Mercedes/Bosch fan can be made to work with Link without using a standalone controller. The fan uses Bosch motor and voltage regulator and has 4 pins in the main connector (+12V, Ground, Speed and Trigger). The help file is not very detailed on wiring so any help is highly appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 16, 2017 Report Share Posted October 16, 2017 Its quite possible we could make it work but we would need more info about the controller. What is it expecting for the speed signal - PWM, Frequency, Analog? What is expected as the trigger signal? +12V?, +5V?, Gnd? Quote Link to comment Share on other sites More sharing options...
amg Posted October 17, 2017 Author Report Share Posted October 17, 2017 Adam Hi, The speed wire was coming out of the original ECU but I have a feeling it works on duty cycle. Certainly not on voltage - I checked by hooking up a voltage tester to it - no difference in speed. The fan runs at full speed on ignition since it doesn't get any input from the speed wire, which is not ideal. The trigger wire is on ignition 12V. Thanks. Quote Link to comment Share on other sites More sharing options...
amg Posted October 17, 2017 Author Report Share Posted October 17, 2017 Got it working. Set the frequency to constant and used 1 axis of the 3D table as ECT. Changed the Aux PWM % and it worked! Thanks. 1 question though. Increasing the % value reduces the speed. Not a problem really but just curious if this is by design? Quote Link to comment Share on other sites More sharing options...
Simon Posted October 17, 2017 Report Share Posted October 17, 2017 This would think is a fail safe of the unit so that if the wire was disconnected it would run full speed. Our drive is geared to pull the signal low and the Duty cycle refers to the % time it is held low. amg 1 Quote Link to comment Share on other sites More sharing options...
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