Topics created by Hardware_SortingRobotics

@Hardware_SortingRobotics Note that only out7/out8 switch to GND. V_OUTLCX is always high (+12V). If you have an extra GND connection between your SSRs and V_OUTLCX, the SSRs may be switched on all the time.

@jay_s_uk @Hardware_SortingRobotics Yes, this catches me out, too! Pin 3 of the temp_db header is the first numbered spi.cs pin, and on all Duets it is spi.cs1 except the 6HC and 3HC, where it is spi.cs0.

Most of the documentation treats the 6XD as being similar to the 6HC, but in this respect they are different. I'll check and update the documentation for the temperature daughterboards. I've recently gone through this for the accelerometer documentation; I forgot to check the temperature daughterboards section. Apologies for the documentation inaccuracy!

Ian

How much current do the heaters draw? The fan headers are meant for low current devices like fans. You can use them to switch an external mosfet or SSR to control a heater though.

@injoi9000 said in Duet 2 Expansion Board Malfunctioning:

Could you elaborate more on what you mean by "bad ground"?

Proper grounding of the Duex to the Duet is essential for signal integrity. See https://docs.duet3d.com/Duet3D_hardware/Duet_2_family/DueX2_and_DueX5#power-wiring

Ian

@injoi9000
M564 doesn't allow this for single axis', but you can use G92 X0 in config.g to fake a homed X-axis. Then home the other axes.

Do you have the page zoomed or something? Or perhaps it's just the large number of entries that doesn't fit well in the defined space.

@injoi9000 said in Remove the "temperature not rising fast enough" errors??:

Why is it that when my heater is in bang bang mode it still sends a temperature not rising fast enough error? It is super annoying...I can't disable it with the m570 command either I am still getting errors...

Because the heater protection needs to know the characteristics of the heater to be able to detect a disconnected thermistor, regardless of the control mode. See my previous response.

There was another discussion about this recently...
https://forum.duet3d.com/topic/14746/do-any-duet3d-boards-monitor-the-motor-current?_=1586272590079

Unfortunately, no. You'd either have to use the work around you're currently using, or switch to a different type of motor that would function in an on/off fashion.

I am sorry, I misread your post. I now see that you are using the PWM ports, not the fan ports.

Please see this post https://forum.duet3d.com/topic/8453/microsecond-resolution-when-using-m280-for-servo-control. In summary, the following should improve the resolution:

Use firmware 2.03RC2 instead of firmware 2.02 Or use a PWM port controlled by a timer channel instead of a PWM channel

PWM is a good way to throttle DC devices but for AC motors you generally need an inverter that goes AC to DC to AC where the frequency of the final AC controls the motor speed.

You may be able to drive an inverter via a PWM signal or perhaps build yourself a voltage divider and smoothing circuit to convert the PWM into a 0-10V signal which is often used by industrial equipment. The alternative 4-20mA would be a little more tricky!

@injoi9000 I know this thread is very old, but I'm trying to do something almost exactly similar (control 88 solenoids). I'm very curious, did you manage to make it all work?

I've done a little reading about ESCs, and it appears that some of them at least need to be calibrated. For example, see the calibration section at https://dronesandrovs.wordpress.com/2012/11/24/how-to-control-a-brushless-motor-esc-with-arduino/.

@core3d-tech said in Moving the gantry damage the stepper drivers when powered off?:

what about when the power is on and you move the gantry too fast. Can this still cause issues? Does it matter whether power is on or off?

It's possible in theory to damage the drivers by moving the gantry too fast, although you would normally have to move it very fast to cause damage. The Motor EMF calculator at reprapfirmware.org will tell you just how fast - look for the speed at which the EMF due to rotation exceeds 27V. Damage is probably more likely with power on, especially if it's 24V power.

Are you certain that the boards are getting damaged, and they don't work again if you let them cool down?

Are they genuine Duet boards purchased from Duet3d.com or from one of our resellers? Genuine TMC2660 chips from Trinamic are now very reliable, but it could be that cloned boards use cloned or reject chips.

As shown in the video, disconnecting motors while under load doesn't normally cause the drivers to fail. OTOH a short circuit across a motor coil, or between one of the motor wires and ground, is much more likely to cause a failure.

HTH David