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Topic-icon HBL2350 loose contact? correct volt -> MosFail

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4 years 6 months ago #29530629 by fred.o
Hi there,

I am a student from germany trying to build a electrical powered bicycle trailer.

Parts for this project are:
  • HBL2350 Motor controller
  • 2x directdrive motors from MXUS with 250W/36V/400rpm each
  • force sensor
  • 40V 10Ah Li-BAttery

Everything is working, but sometimes there are some hiccups while testing.
I narrowed the problem down to 2 possible situations which i can force by jiggeling the USB Port.
  1. No MosFail, working, sometimes undervolt, low Batt (~32V) and Controller (~10,5V) Volt, jumping voltages and MCU-Temp (~80, not real)
  2. MosFail after 1 sec, but stable and high voltages and low MCU-Temp, Batt 39,2V and controller 13V , 40°C MCU

I added two screenshots of the situations. I get to situation 2 by forcing the USB-cable a little up or down. If i let loose it returns to situation 1. In situation 2 there will be MosFail afer around 1 second and the contactor will cut power.
Another group of students worked with the motorcontroller before me, so I cant say if there possibly was an accident with the parts.
Is there a way to determine if this is an hardware or a software problem?

Situation 1, normal, just started


Situation 2, usb cable forced down


Situation 2, longer period


Thanks in advance!

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4 years 6 months ago #29530630 by TechSupport
The controller volts shouldn't drop like that.

Try a reset to defaults. Also, the USB is not robust to connect pc with while running motors (recommend RS232). It could be some setting parameters you are using that may be causing the problem.

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4 years 6 months ago #29530657 by fred.o
I did a reset to default values and entered only the simplest configuration options for the bldc. (magentcount...)

The problem is still there. Constant undervolt on controller and battery voltage. MCU-Temp ist going crazy.

When i jiggle the usb-cable around everything seems to work fine.... Voltage and temp goes stable. (real battery voltage and controller voltage between 12 and 13) But only for around a second. After that the controller goes to MosFail and cuts power with the contractor.

This also happens without a computer connected, if I only plug the cable in the controller und move it around.

Under what circumstances does the controller go to mosfail? For around a second all voltages seemm allright. Then MosFail. Another jiggle and there comes the undervolt again. (battery is ok)

Thanks in advance!

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4 years 6 months ago #29530658 by TechSupport
Sounds like something in your output stage is damaged for sure. This will need to either be replaced or repaired.

If this was bought within the last 90 days, it is covered under warranty.

You can get more information on a repair or warranty by email to our customer service at This email address is being protected from spambots. You need JavaScript enabled to view it.

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4 years 6 months ago #29530663 by fred.o
Thank you very much. I will see what is possible....

One last question, sometimes i get everything working stable. BUt then MosFail is always on? why?
Here is a screenshot. As soon as i touch the usb cable it starts going up and down.

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4 years 6 months ago #29530665 by TechSupport
It is likely on because something in your output stage is damage, or maybe in the logic. As you can see from the screen capture, the battery amps is reading 3A, when the motor output is set to idle 0 command. It should also read 0.

To know for sure if it is the controller that is bad, is to disconnect the motor and see if restarting the controller, it still shows mosfail.

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4 years 6 months ago #29530669 by fred.o
This screenshot was taken without a motor connected.
Thanks for the help.

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