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PDM Installation & Configuration: Step 1: List System Components & Determine Power Draw

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Step 1: List System Components & Determine Power Draw


00:00 - In this section of the course, we're going to go through our HPA 6 step PMU setup process.
00:05 This breaks the correct method of setting up a PMU from scratch in a performance automotive application down into 6 manageable tasks that you can follow along with in order to foolproof your PMU project.
00:19 If you want to see this process being put to practice on real projects before embarking on your own, check out the worked examples section of the course after you've finished here.
00:28 The first step we need to undertake is to list out all of the components that the PMU will be supplying power to and determine their current draw.
00:37 This is often undertaken in parallel with the wiring harness design process as there's quite a lot of overlap between these 2 tasks.
00:43 I'd suggest completing this initial planning step before deciding on a particular PMU to use.
00:50 In fact, I'd also suggest completing step 2 of this process before completely deciding on a particular PMU.
00:56 It's better to be in the situation of having your system requirements drive the PMU selection as opposed to having the PMU capabilities possibly limit something that you would like to achieve.
01:07 You'll need to be very familiar with the documentation for the PMU you're using and although we're not doing any detailed design work like pin assignments or control function design in this step, you do need to have a good idea at this stage of what the PMU is capable of to ensure that you don't put any components on this list that the unit can't supply enough power to.
01:28 There are 2 important checks to perform in this step, the first is to sum up all of the individual current draws from the items in your system and ensure that this total is below the maximum specified by any particular PMUs you're considering using.
01:42 The second is to ensure any PMU you're considering has enough output channels to control all these items.
01:48 Some of them will likely be grouped together and wired to a single output channel.
01:52 Ignition coils, injectors and other engine control solenoids being a pretty common example of this.
01:58 So this is something to keep in mind.
02:00 The key idea of this step is to ensure that you have all of the components in the vehicle that the PMU needs to power accounted for.
02:07 Because we'll be referring to this list for the rest of the design process and we want to make sure that no critical elements are missed.

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