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fan: Add off_below option for fans (#1897)

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Below off_below the fan will be turned off. When configured correctly this
can prevent stalling, which may lead to overheating and failed fans. To
simplify calibration and use of this setting, off_below is applied in the
input duty cycle domain, prior to any scaling due to e.g. max_power.

Signed-off-by: Nicholas Seckar <nseckar@gmail.com>
This commit is contained in:
Nicholas Seckar 2019-10-03 14:59:03 -07:00 • committed by KevinOConnor
parent 27717440aa
commit 004edb9613
2 changed files with 17 additions and 0 deletions
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4
klippy/extras/fan.py
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@ -16,6 +16,8 @@ class PrinterFan:
self.max_power = config.getfloat('max_power', 1., above=0., maxval=1.)
self.kick_start_time = config.getfloat('kick_start_time', 0.1,
minval=0.)
self.off_below = config.getfloat(
'off_below', default=0., minval=0., maxval=1.)
ppins = printer.lookup_object('pins')
self.mcu_fan = ppins.setup_pin('pwm', config.get('pin'))
self.mcu_fan.setup_max_duration(0.)
@ -29,6 +31,8 @@ class PrinterFan:
def handle_request_restart(self, print_time):
self.set_speed(print_time, 0.)
def set_speed(self, print_time, value):
if value < self.off_below:
value = 0.
value = max(0., min(self.max_power, value * self.max_power))
if value == self.last_fan_value:
return