M23CL Internal fuse blowmn

Contrepointe

Hello everyone,

I am currently building a CNC,

I have a problem with my M23CL motors with brake.
the internal fuse of my two motors has blown.

I don't understand where this could come from, the motors worked correctly after their settings, correct movement on X and Y, and this evening when turning on the machine, I made a homing and clack, no more red LEDs, no more movement!

Diagnostic = INTERNAL FUSE failure

I would like to replace this fuse but I don't know these values, could you please send them to me.

So could you tell me a possible cause of this problem?

I use a high quality 48V power supply. The motors are connected to a Duet 3 Tool Distribution Board and are powered by it.

Thank you for your help

Clement

Contrepointe

Contrepointe

dc42

@Contrepointe the fuse part number is 0468002.NRHF or 0685T2000-01.

These fuses don't normally blow if the motor has a permanent connection to the PSU because the slow rise in PSU output voltage when it is powered up limits the surge current drawn by the motor. However, if the PSU is powered up first and then the motor is connected to the PSU, the surge as the capacitors in the motor charge may blow the fuse. See the blue box at https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Motor_23CL#power-wiring.

Contrepointe

@dc42

Thank you for your quick feedback, it is very much appreciated.

The motors are connected to the Duet 3 Tool Distribution Board which is powered directly by the 48v power supply, they are therefore energized as soon as I turn on the electrical cabinet (red M23CL LED flashes), I checked the voltage of the cable power supply of the motor, I am at 48v permanently.

The motors are equipped with a brake, I noticed that the brake is 24V, wouldn't it be a problem to power the motors with 48V?

The fuse blew when I engaged the motors (M17 Y X), releasing the brake.
Could switching on the motors create an overvoltage and blow the fuse?

Thank you very much for your help.

T3P3Tony

@Contrepointe I have updated the documentation to explain that the M23CL brake circuit has PWM control which limits the current to the 24V brake solenoid base don the VIN voltage to allow higher VIN voltages than 24V to be used.

Contrepointe

@T3P3Tony

Thank you for this information, I am happy to know that I can keep my 48v power supply.

@dc42

Concerning the fuse problem, this is resolved, I replaced the internal fuses identically (2A), and I installed inrush current limiters (2A) on each VIN power line (+) coming out of the tool distribution card.

Thank you both for your help!

I have another question regarding the M23CL (maybe create a new topic):

Is it possible to configure a fixed origin with this type of closed loop motor, or is an end stop required as with standard motors?

I still have to do the PID adjustment of the motors, they are already running great, I can't wait to start manufacturing!

This is my first NC with a duet card, I am very happy with the duet products that I use on many 3D machines!

Sorry for the spelling mistakes, I'm French

Contrepointe

T3P3Tony

@Contrepointe said in M23CL Internal fuse blowmn:

I have another question regarding the M23CL (maybe create a new topic):

Is it possible to configure a fixed origin with this type of closed loop motor, or is an end stop required as with standard motors?

You do need to use an endstop to home the axis as the absolute encoder is not a multi turn type so it does not know the absolute possition along the axis.