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RCT VMlll 5kw inverter's control board.


SB07
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Hi All,

I need to replace a component on my RCT VMlll 5kw Axpert inverter's control board.

I am desperately in need of the part (code) number for the component, unfortunately the existing one is unidentifiable.

I've been searching the net with no luck.

It would be greatly appreciated if someone out there can assist. (Please see photo attached)

Thanking you in advance. 

 

SB07

IMG_0138.jpg

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11 hours ago, SB07 said:

I need to replace a component on my RCT VMlll 5kw Axpert inverter's control board.

I am desperately in need of the part (code) number for the component, unfortunately the existing one is unidentifiable.

Unfortunately, I don't know of any schematics (official or traced) of any Axpert control boards.

The part is obviously a voltage regulator, with G O and I pins clearly marked (Ground, Output, and Input respectively). The DSP used in this model is a TMS320F28062, which needs a single 3.3 V supply. Other models have a TMS320F2809 DSP, which needs both 3.3 V and 1.8 V power supplies; those have pairs of voltage regulators like this one.

So almost certainly it's a 3.3 V LDO (Low Drop Out) voltage regulator from the +5V (available from the nearby connector CN10 pins 14-16). You'll have to buzz out the input and output pins to some of the Vdd power pins on the DSP; one of them is pin 3. 

IF it IS a +3.3 V regulator, this one should work: https://www.mouser.co.za/ProductDetail/STMicroelectronics/LDL1117S33R/?qs=AQlKX63v8Rt9Bf6AWSrbFg%3D%3D

NOTE: not all voltage regulators have the same pinout! I looked at a Texas Instruments one, in an identical package, and the pinout was different!! (In, Gnd, Out left to right, as with TO-220 positive regulators). So check carefully that the one you order has the pins in the correct order.

Let us know how it goes. If the power supply to the DSP blew up, then there is a chance that the DSP is also damaged. If you need to replace the DSP, then you'll need a bootstrap loader (PM me if needed), which is a whole world of trouble. But it can be done. It might be worth trying to buy a replacement control board from your supplier, but it won't be a fast option.

Good luck!

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Thank you Coulomb, I really really appreciate all your information, after all my struggles to find this part this is much more than I had wished for. 🙂

I will order the part soon and let you know the outcome.

Once again thank you very, very much. 

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  • 2 weeks later...

Hi Coulomb, 

Just to let you know that I finally got the part and installed it, unfortunately I did not get the result I was hoping for.

I think you are spot on the DSP probably needs replacing.

 I found some guys in Pretoria who does repair work on the Axpert inverters, I will take it to them in due course.

Thank you once again for your help, much appreciated.

 

 

 

 

 

 

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