6.0 FICM - How to adjust the output voltage - TheDieselGarage.com
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post #1 of 24 (permalink) Old 02-21-2010, 03:25 AM Thread Starter
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6.0 FICM - How to adjust the output voltage

Sorry all. I was hoping to do this back over a month ago.

Since there are many threads discussing how to get to and remove the ficm I will skip this. I'm starting with the assumption that you have the ficm apart and the power supply board is sitting in front of you.

This will be very straight forward because almost everything needed is in the pictures. I know I will forget something (because I'm distracted) so feel free to PM me if I don't respond to the thread in a timely fashion.

To start, here's a basic schematic showing the circuit you are working with. The actual power path (inductor, capacitors, fet switch and diode) are repeated 4 times on the board. However, there is only one feedback path which sets the output voltage.



The idea is simple... lower the value of the 2.15KOhm resistor by placing another resistor in parallel with it.

Here's a picture of the 7-screw ficm power board (If someone with the 4-screw model can post a picture that would be great). Please note, part values and names are the same for both variants and so is the general location of the parts (IIRC). I've crudely labeled the points you need to find and what I see as the best spot to make the modification.



The screw hole potentials (from left to right, listed as one row) are:

48V, 5V, (Not Determined), Ground, Ground, 12V.

That's about it! Install the adjustment resistor and you'll have your new voltage.

If you want something other than 58V (10K resistor) or 54V (20K resistor), you can find the necessary resistor value using the following equation:

R2 = 48.7 KOhm
R1 = 2.15 KOhm
Vout = Desired Output Voltage
Radd = Parallel resistor to R1 necessary to achieve Vout

Radd = (2.0295 * R2 * R1) / ((Vout * R1) - 2.0295 * (R1 + R2))

Thats it!

Cheers!
Brad
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post #2 of 24 (permalink) Old 02-21-2010, 06:47 AM
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post #3 of 24 (permalink) Old 02-21-2010, 02:00 PM
Too much into it now...
 
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This should be a "Sticky"!!!!
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post #4 of 24 (permalink) Old 02-21-2010, 02:48 PM
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How is this effecting the truck?
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post #5 of 24 (permalink) Old 02-21-2010, 02:50 PM
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For those of us ......less electrically inclined, when you say put it on top, are yo literally soldering it on top, or in another location????
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post #6 of 24 (permalink) Old 02-21-2010, 03:58 PM Thread Starter
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Literaly on top. Attach one side of the resistor to one end of the capacitor and the other end of the resistor to the other end of the capacitor.

A surface mount resistor is ideal because it will sit right on top and you just need someone to put some solder on each end. If you use a leaded component (classic resistor) you'll find the work much more difficult. You can get resistors from Digikey for next to nothing. Here's one example which will work.

http://search.digikey.com/scripts/Dk...HM10.0KCRCT-ND

These parts are somewhat small, so if you're not comfortable with this sort of work check with your friends... odds are someone has the capabilities to do the work.

Let's keep this thread as a "how-to". Take a look at the Swamps Hot FICM thread for pro/con discussion and real world performance. I think most of your questions will be answered there.

Swamps Diesel Hot FICM Tests

Cheers!
Brad

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- SCT by D.J., Powershot 2000, '05 Power Elbow, Isspro gauges under dash,
- Slam Specialties RE8's in the front... 5 inch drop to 4 inch lift at my command
- Herculiner on the runnin' boards and The Go-Fast Scratch! (THE latest must-have free mod!!!)
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post #7 of 24 (permalink) Old 02-21-2010, 04:19 PM
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How about a finished picture showing the Digikey?

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post #8 of 24 (permalink) Old 02-21-2010, 04:32 PM Thread Starter
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I thought I had forgotten to take a pic post-modification but I was wrong. This pic isn't the best but does illustrate placement of the resistor.

FYI, I used an even smaller resistor because I had it on hand. An 0805 size resistor like I linked to above would be easier to work with.

Cheers!
Brad

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- SCT by D.J., Powershot 2000, '05 Power Elbow, Isspro gauges under dash,
- Slam Specialties RE8's in the front... 5 inch drop to 4 inch lift at my command
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post #9 of 24 (permalink) Old 02-21-2010, 04:55 PM
Contain the BTU's...
 
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Great post Brad! Thanks!
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post #10 of 24 (permalink) Old 02-21-2010, 06:44 PM
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Quote:
Originally Posted by bakantor View Post
Literaly on top. Attach one side of the resistor to one end of the capacitor and the other end of the resistor to the other end of the capacitor.

A surface mount resistor is ideal because it will sit right on top and you just need someone to put some solder on each end. If you use a leaded component (classic resistor) you'll find the work much more difficult. You can get resistors from Digikey for next to nothing. Here's one example which will work.

http://search.digikey.com/scripts/Dk...HM10.0KCRCT-ND

These parts are somewhat small, so if you're not comfortable with this sort of work check with your friends... odds are someone has the capabilities to do the work.

Let's keep this thread as a "how-to". Take a look at the Swamps Hot FICM thread for pro/con discussion and real world performance. I think most of your questions will be answered there.

Swamps Diesel Hot FICM Tests

Cheers!
Brad
In other words your are creating an "RC" circuit.
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