Any idea how much power a V3 MS1 board uses? I have it wired up to constant power source. Any idea how much current it draws, or how long it would last on a battery. I figure the stock EFI PCM always has power, maybe Megasquirt can too?
Thanks.
MS Power usage
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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JustinGray
- MegaSquirt Newbie
- Posts: 1
- Joined: Thu Oct 14, 2004 6:51 pm
- Location: Cleveland
How can the power requirement be for 2 amps when the regulator is not rated to that level?
The U5 regulator is only speced to provide 500 mAs directly. Does anyone have a good number for the actual usage of the MS board itself. I am trying to determine the available current to drive another board using the MS u5 regulator
The U5 regulator is only speced to provide 500 mAs directly. Does anyone have a good number for the actual usage of the MS board itself. I am trying to determine the available current to drive another board using the MS u5 regulator
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Glen Hoag
I threw an ammeter on a v3 a while back and got around 200mA running on a stim. Note that most of the MS outputs merely provide a ground path for the devices they control, so power for them doesn't go through the regulator.
If you provide constant power to the MS, you would have to change the code to create a different strategy for cold start. MS currently reads ambient barometric pressure by reading the MAP sensor at startup.
There is a 1A version of the regulator specified for the MS. It is LM2940T-5.0. I have provided this part in all my v3 kits, and most of my v2.2 kits. On the v3 board, you need to make sure that you don't try to draw too much current downstream of the polyfuses; they are rated at 0.55A.
If you provide constant power to the MS, you would have to change the code to create a different strategy for cold start. MS currently reads ambient barometric pressure by reading the MAP sensor at startup.
There is a 1A version of the regulator specified for the MS. It is LM2940T-5.0. I have provided this part in all my v3 kits, and most of my v2.2 kits. On the v3 board, you need to make sure that you don't try to draw too much current downstream of the polyfuses; they are rated at 0.55A.