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Regeneration current from motor switches off power supply

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Forum 1
(@lefab64)
Posts: 2
New Member
Topic starter
 

Hi,

I control a brushless motor 24V 14A with a Solo UNO.

I have a brake resistor 68Ω 25W and RBA resistor 55KOhms (activation voltage at 25V).

When my motor produces a regenerative current (LED B1 On) "sometimes" the power supply switches off.

To solve the problem I would like to add a diode on the SOLO power supply but I don't know how to choose it?

Thanks for your help.

Regards.

Document systems
 
Posted : 17/01/2024 9:56 pm
SOLO Team
(@milad)
Posts: 572
Illustrious Member Admin
 

Hi @lefab64,

Adding a diode on a path of Supply to SOLO ( or any 4-quadrant drive) can be detrimental for the Driving unit, as the energy fed back from the motor has no path to go back and this can cause severe over-voltage and damaging the Drive, the best way is to reduce the deceleration so that your regeneration is not causing Over-voltage, to see that effect, the best way will be to monitor the BUS voltage ( the + and - of your supply) close to SOLO ports using an oscilloscope and checking how much the bus voltage rises during the delegations.

let me know if this can work or if you need further clarification.

Milad

 

If you found the answers helpful and you could solve your problems, please kindly verify here to help others in the future.

 
Posted : 18/01/2024 7:58 am
SOLO Team
(@milad)
Posts: 572
Illustrious Member Admin
 

Hi @lefab64,

Posted by: @lefab64

If I add the diode, "normally", the brake resistor should absorb the overvoltage/current from motor regeneration, don't it?

 

The brake chopper circuitry on SOLO UNO has limited power, depending on your voltage, it can range something from 10-15W maximum dissipation, so even if the brake chopper is in the circuit, it won't dissipate all the energy, thus the rest of the energy will cause Over-voltage if a diode placed on the path.

Posted by: @lefab64

Do you have any suggestion for a 24V power supply?

 

I believe for your initial tests, it would be great to have a LAB power supply like DPPS-60-10 where you can set the voltage/current limits accurately and test various scenraios.

Let me know if you have other questions.

Milad

 

If you found the answers helpful and you could solve your problems, please kindly verify here to help others in the future.

 
Posted : 18/01/2024 10:14 am
Forum 1
(@lefab64)
Posts: 2
New Member
Topic starter
 

Hi Milad,

May be I have found the origin of the problem.

The current brake resistor was 600 Ohm wich is may be too much impedance for the SOLO Uno?

I have ordered one of the recommended resistor (HSC100-100R 100 Ohm 100W), may be it will improve the issue...

I'll let you know..

Regards.

 
Posted : 18/01/2024 2:55 pm
SOLO Team
(@milad)
Posts: 572
Illustrious Member Admin
 

Hi @lefab64,

Nice, let me know.

Milad

 

If you found the answers helpful and you could solve your problems, please kindly verify here to help others in the future.

 
Posted : 23/01/2024 9:09 am
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