One fan output running variable speed for cooling blowers

gnydick

@dc42 Below is my setup for my fans, both cold section and print cooling blowers.

Out of all of fan headers/pins, only F1 is capable of running my blowers at variable speed. All of the other fan outputs will only run the blowers at 100%.

I've tried all of the blowers on all of the connections and it really is the specific connection that determines it.

These blowers are so powerful, my prints are cooling before the layer has a chance to bond.

Any ideas??

All of the blowers are identical.
PART: 1570-1034-ND
MFG: MechatronicsFanGroup / B5015E24B-BSR DESC: BLOWER50X15MM 24VDC 9.0400072.32 COO: INDONESIA
ECCN: EAR99
HTSUS: 8414.59.6560 ROHS COMP

I have tried multiple

; Fans
;tool 0
M950 F0 C"duex.pwm4" Q500
M950 F1 C"^duex.pwm5" Q16000
M950 F2 C"duex.pwm3" Q500
M950 F3 C"^duex.fan3" Q16000
M950 F4 C"duex.fan4" Q500
M950 F5 C"^duex.fan5" Q16000
M950 F6 C"duex.fan6" Q500
M950 F7 C"^duex.fan8" Q16000

M106 P0 C"Cold Section 0" S1 H1 T80 B1
M106 P1 C"Tool 0 Blower" S0 H-1 B1
M106 P2 C"Cold Section 1" S1 H2 T80 B1
M106 P3 C"Tool 1 Blower" S0 H-1 B1
M106 P4 C"Cold Section 2" S1 H3 T80 B1
M106 P5 C"Tool 2 Blower" S0 H-1 B1
M106 P6 C"Cold Section 3" S1 H4 T80 B1
M106 P7 C"Tool 3 Blower" S0 H-1 B1

gnydick

@gnydick I moved the blowers all to the pwm and they work there. Unfortunately, since it's got 4 tools, I don't have enough pwm outputs because I need 2 out of the 5 as heaters which leaves me only 3 for the blowers

dc42

@gnydick the DueX fan outputs do not support variable PWM frequency, so the M950 Q parameter is ignored for those pins. Many blower fans either do not work at all with PWM, or only work at very low PWM frequencies.

gnydick

@dc42 thank you for the explanation.

zapta

@gnydick said in One fan output running variable speed for cooling blowers:

which leaves me only 3 for the blowers

Do you really need independent control for the material cooling fans? That is, will connecting multiple tool fans to the same channel work for you?

gnydick

@zapta not really a fan of trying to connect 4 high current fans to one output

baird1fa

@gnydick just use a mosfet if you are concern about the current. That would protect the board from over current.

dc42

@gnydick said in One fan output running variable speed for cooling blowers:

@zapta not really a fan of trying to connect 4 high current fans to one output

Connecting 4 high current fans to a single heater output (or 2 each to 2 heater outputs) should not be a problem.

gnydick

@dc42 good to know, I'm assuming to wire them in parallel?

zapta

Will be interesting to see if connecting the fans in parallel will cause them to synchronize their speed and phases like these.

https://www.youtube.com/watch?v=T58lGKREubo