Run current limitation

[BL1]

Using SPINFamily Evaluation Tool 3.2, STnucleo-f401re and IHM03A1, I try to drive a 48V-9A motor.

In SPINFamily interface, I choosed current mode and tried to set run current to 9A. But an error show up in the interface: "Power dissipation on sense resistor to High for RUN Current".

With run current to 7A, all is working fine, but not higher. Do you know why?

[MM..1]

dissipation on sense resistor is real element with max power for example 2W and your calculation for 9A is over this and windoww report you 3W = blown.

Change it to more W or less mOhms

[BL1]

But Rsense and PMax were predefined according to the board I'm using

Can I change them without risk of hardware damages ?

[MM..1]

I dont recomm change in window, but change real hardware components and then enter changed values

[BL1]

Hi @Cristiana SCARAMEL​ ,

I through this was the same, thanks

Can I simply change Rsense and PMax value to respectively 100(mOhm) and 2 (W) ? or do I need to do some hardware modifications on the board to safely reach 9A ?

[MM..1]

Realy 0.1Ohm x 9^2 = 8,1W Your Rsense blown when is 2W.

[BL1]

Hi @Cristiana SCARAMEL​ / @MM..1​ ,

Thank you very much for useful help :)

[MM..1]

@BL​ for complete clear , maybe you need stop work with 10Amps , when you need ask this questions. Start learn use multimeter, Ohm law and scope.

And FYI 30mA can kill your heart.