I suggest you look at https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareDeltaPrinter#Section_Adding_additional_towers_to_carry_flying_extruders. Pure Z movement to match the effector height isn't supported, but you can approximate it if you want to by specifying a very long "rod length" for the 4th tower.
@dc42 said in Disconnecting Heater and Thermistor while powered:
The patent I had in mind it this one https://patents.google.com/patent/US8926484.
It probably doesn't apply anyway to one offs that many people here do but the patent claims seems to this layperson to have very specific requirements and thus narrowing the protection and allowing workarounds. For example 'a portion of the actuator assembly is configured to move along an axis toward the master unit' which doesn't prohibit configurations where the lock/actuator movement is in parallel to the gantry. That restriction was added for a reason, probably due to prior art.
@Scally123, you misunderstood me. When I said:
@dc42 said in Thermistors not recognized, open circuit temperature at 2000°C:
Try sending M305 P0 with no other parameters, and check it reports that it is configured for a PT1000. Likewise M305 P1.
I meant you to leave the M305 commands in config.g alone, but to run those 2 commands from the console, to check that the 2 heaters were configured to use PT1000 sensors.
The Duet has no knowledge of the microstep setting of your external driver, and RepRapFirmware ignores M350 settings for external drivers. The microstepping will be whatever you have set the external drivers to using the switches on it.
@ringo1508 You connect the convertor to the power supply. The positive to the output side, and the negative drrectly to the bed. The ssr will control the positive going to the bed. Connect the ssr input to the bed connector on the duet. Pay attention to the polarity on the ssr. If the ssr is one of the crappy ones, you won't get the full 12vdc to the bed and run hot.
@fm16055, to use it in single-ended configuration, connect all the + step/dir/en inputs of your drivers to +5V from one of the servo connectors on the expansion breakout board. Leave the + step/dir/en outputs of the breakout board not connected.
@reflexlab said in Multiple valve PWM control with DUET:
Bearer : I think flyback diodes are already built in isn't it ?
Flyback diodes were added to the OEM fan outputs from revision 1.02 of the Duet 2