pwm controlled waterpump
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@cosmowave most likely the pump takes a standard open drain PWM input. In which case you can connect it as you would connect a 4-wire fan. However, as it draws about 1.7A, you can't power it from the internal 12V supply of a Duet 3 or Duet 3 Mini assuming you are using 24V VIN. So you will need an external buck regulator to provide 12V.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
Thanks for your answers.
@o_lampe
It will be ok as a "sign of live" signal. Closed-loop control is not really necessary
I will also try an external flow-meter and temp sensor. But again, also for checking if flow is present.@dc42
I d'like to power (+12VDC,GND) the pump directly from my 12V power supply.
Only the pwm and tacho signal goes to the duet. -
@cosmowave
Definitely a different pump to me but similar idea.
I use this
https://www.aliexpress.com/item/4000034575710.html
I power mine from an external 12v supply as the duet is on 24v.
DWC looks like his
I monitor the pump in daemon.g
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@cosmowave said in pwm controlled waterpump:
Has your pump also a pwm control input?
Yes it does.
Essentially I treat it as a thermostatically controlled fan.
Same with the radiator fan.
In my case the radiator fan doesn't ever turn off completely as it has a minimum possible PWM (didn't realise till I got it).EDIT
I should note that the indicated speed is the impeller speed.
If a hose blew, it would still show as running. I need to put a flow sensor on the return near the radiator as well. -
@dc42 said in pwm controlled waterpump:
However, as it draws about 1.7A, you can't power it from the internal 12V supply
Is it possible to power the pump from the bed heater output?
I use a SSR (3-32VDC in) for my bed.
Is it possible to set the bed heater output constantly on, without linking to a temp sensor? -
@cosmowave said in pwm controlled waterpump:
Is it possible to set the bed heater output constantly on, without linking to a temp sensor?
You can invert the pin name with a ! to have it on by default.
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@Phaedrux
oh yes. That's easy!
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@phaedrux said in pwm controlled waterpump:
You can invert the pin name with a ! to have it on by default.
But is it possible to create the (bed) heater, which i'd like to use for powering my water pump (always on), without linking it to a temp sensor?
With M950, the T parameter seems not to be optional...Mankati FSXT+, DeltaTowerV2, E3D MS/TC
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Well you can link it to any temp sensor you like with any temp range you like. So in effect any sensor could allow it to be enabled or disabled.
I suppose you could define it as a GPIO pin to control the water pump with an M42 command instead of as a heater, then it's just on or off.
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@cosmowave
Maybe define it as a spindle? That way you don't need a temp sensor and can set RPM directly. (as percentage of max RPM) -
@o_lampe But is "spindle on/off" M3 / M5 not CNC/laser specific ? Can i use the commands in printer mode?
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@cosmowave said in pwm controlled waterpump:
@o_lampe But is "spindle on/off" M3 / M5 not CNC/laser specific ? Can i use the commands in printer mode?
Why do you need to PWM control this cooling unit? I use similar as @OwenD SSR to switch on the pump. Always ON
M950 F1 C"out6" Q500 ; create fan 1 on pin out6 and set its frequency Hotend Cooling Waterpump M106 P1 S1 -
@tecno I'd like the idea to control the speed of the pump... also for reliability.
