Hi, I am using L6235Q Evaluation board for my brushless motor. I connected the board to the motor and the motor not moving. the connection is so simple but the motor is not moving.

[IGAL TALOR]

I am using 12V motor, all the phase I measured 12V, its look like it stuck at brake.

what can be the problem?

I am using motor 1028m012b - FAULHABER

[Javier1]

Can you show us some picturesof your setup(wiring)?

[IGAL TALOR]

CONNECTIONS:

VS = 12V

J3-16 EN = 5V

J3-6 BRAKE =5V

J3-11 = 5V (its means VREF = 0.9V MEASURED)

J3-4 = 5V (FWD)

all Hall effects connected to motor

all Phased connected to motor

5V and GND supplied to motor

[IGAL TALOR]

the motor that I am using

[Cristiana SCARAMEL]

Hi @IGAL TALOR​ and welcome to the ST Community.

first I suggest to check the J2 setting: you have to change the default connecting the poles 2-3.

In this way you apply the the 5 V (J3-1) to the VDD net that is used for the Hall effect sensors supply voltage and pull-ups voltage.

Moreover, you may verify also the proper connection of motor:

• Hall sensors: poles 6, 7, 8 to H3, H2, H1 respectively (J7-3, J7-2, J7-1) EDIT: correct the typo
• Phases: poles 1, 2, 3 to OUT3, OUT2, OUT1 respectively (J5-1, J5-2, J5-3).

I would also point out that by applying a VREF voltage of 0.9 V in practice you are disabling the PWM current control (Ipeak = VREF/Rsense = 0.9 V / 0.1 ohm = 9 A!). I suggest to reduce the VREF value according to your target phase peak current.

Let me know is these info are useful to run the motor.

[IGAL TALOR]

HI

J2, I already connected poles 2-3to use 5V.

J5-1 to motor pin 1

J5-2 to motor pin 2

J5-3 to motor pin 3

J7-1 to motor pin 8

J7-2 to motor pin 7

J7-3 to motor pin 6

PWM control no matter at this point, I just want to see that the motor is running.

[Cristiana SCARAMEL]

Hi @IGAL TALOR​,

please double check the J5 connection.

The silkscreen near the connector indicates the IC OUT number, not the J5 poles number.

If this does not solve the issue, it is necessary to check the device signals with oscilloscope.

[IGAL TALOR]

I connected:

OUT1 J5-3 to motor pin 3

OUT2 J5-2 to motor pin 2

OUT3 J5-1 to motor pin 1

you can see at the motor data sheet that I attached before.

[IGAL TALOR]

I tried to swap between PHASE A and C and the motor is not moving.

[IGAL TALOR]

all the phases A,B and C are with 12V, looks like at brake.

[Cristiana SCARAMEL]

I confirm that the only configuration that brings all outputs high is the brake function.

Try to verify the voltage as close as possible to the BRAKE pin (#20), if is correctly set high.

[IGAL TALOR]

I checked pin 20 =5V.

also checked pin 19 and i found that Vref is 0V,

the problem with the evaluation board, I connected J6 2-3 and J3-11 to 5V, and no vref voltage.

still the motor not moving, but now I see current consumption from my power supply.

[IGAL TALOR]

I measured PIN 20 BRAKE = 5V

checked PIN 19 VREF = 0V

the problem is with evaluation board I connected J6 2-3 and powered J3-11 with 5V and no voltage to VREF.

now I powered the VREF and I see power consumption but still the motor not moving.

[IGAL TALOR]

The schematic of the evaluation board is not correct.