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Question Nevermore Fans Never Turn

Alan

Member
I have tested the fans and leads and they are good. However, fans do not turn on. I think the printer.cfg file is set up to turn it on when bed temp reaches 60C. When I try turning it on manually sending a gcode command the part cooling fan turns on. The part cooling fan appears to be working fine and turns on when bridging, etc. Below is what I think is relevant printer.cfg file section. The Nevermore is plugged in the Octopus V1 FAN3 PD13 pin. What am I doing wrong? Thx!

# Bed Heater
#####################################################################


## SSR Pin - HE1
## Thermistor - TB
[heater_bed]
heater_pin: PA1
## Validate the following thermistor type to make sure it is correct
## Keenovo branded bed heaters should use Generic 3950
## LDO branded bed heaters will have the sensor type labelled on the heater
## Check what thermistor type you have. See https://www.klipper3d.org/Config_Reference.html#common-thermistors for common thermistor types.
## Use "Generic 3950" for Keenovo heaters
sensor_type: ATC Semitec 104NT-4-R025H42G
sensor_pin: PF3
## Adjust Max Power so your heater doesn't warp your bed. Rule of thumb is 0.4 watts / cm^2 .
max_power: 0.6
min_temp: 0
max_temp: 120
#control: pid
#pid_kp: 58.437
#pid_ki: 2.347
#pid_kd: 363.769

#####################################################################
# Probe
#####################################################################

## Inductive Probe
## This probe is not used for Z height, only Quad Gantry Leveling
[probe]
pin: PG15
x_offset: 0
y_offset: 25.0
z_offset: 0
speed: 10.0
samples: 5
samples_result: median
sample_retract_dist: 3.0
samples_tolerance: 0.006
samples_tolerance_retries: 3

#####################################################################
# Fan Control
#####################################################################

## Print Cooling Fan - FAN0
[fan]
pin: PA8
kick_start_time: 0.5
## Depending on your fan, you may need to increase this value
## if your fan will not start. Can change cycle_time (increase)
## if your fan is not able to slow down effectively
off_below: 0.10


## Hotend Fan - FAN1
[heater_fan hotend_fan]
pin: PE5
max_power: 1.0
kick_start_time: 0.5
heater: extruder
heater_temp: 50.0
## If you are experiencing back flow, you can reduce fan_speed
#fan_speed: 1.0

## Controller fan - FAN2
[controller_fan controller_fan]
pin: PD12
kick_start_time: 0.5
heater: heater_bed
fan_speed: 0.5

## Exhaust fan - FAN3
[heater_fan exhaust_fan]
pin: PD13
max_power: 1.0
shutdown_speed: 0.0
kick_start_time: 5.0
heater: heater_bed
heater_temp: 60
fan_speed: 1.0
 

LoadMaster7

Well-known member
I have tested the fans and leads and they are good. However, fans do not turn on. I think the printer.cfg file is set up to turn it on when bed temp reaches 60C. When I try turning it on manually sending a gcode command the part cooling fan turns on. The part cooling fan appears to be working fine and turns on when bridging, etc. Below is what I think is relevant printer.cfg file section. The Nevermore is plugged in the Octopus V1 FAN3 PD13 pin. What am I doing wrong? Thx!

# Bed Heater
#####################################################################


## SSR Pin - HE1
## Thermistor - TB
[heater_bed]
heater_pin: PA1
## Validate the following thermistor type to make sure it is correct
## Keenovo branded bed heaters should use Generic 3950
## LDO branded bed heaters will have the sensor type labelled on the heater
## Check what thermistor type you have. See https://www.klipper3d.org/Config_Reference.html#common-thermistors for common thermistor types.
## Use "Generic 3950" for Keenovo heaters
sensor_type: ATC Semitec 104NT-4-R025H42G
sensor_pin: PF3
## Adjust Max Power so your heater doesn't warp your bed. Rule of thumb is 0.4 watts / cm^2 .
max_power: 0.6
min_temp: 0
max_temp: 120
#control: pid
#pid_kp: 58.437
#pid_ki: 2.347
#pid_kd: 363.769

#####################################################################
# Probe
#####################################################################

## Inductive Probe
## This probe is not used for Z height, only Quad Gantry Leveling
[probe]
pin: PG15
x_offset: 0
y_offset: 25.0
z_offset: 0
speed: 10.0
samples: 5
samples_result: median
sample_retract_dist: 3.0
samples_tolerance: 0.006
samples_tolerance_retries: 3

#####################################################################
# Fan Control
#####################################################################

## Print Cooling Fan - FAN0
[fan]
pin: PA8
kick_start_time: 0.5
## Depending on your fan, you may need to increase this value
## if your fan will not start. Can change cycle_time (increase)
## if your fan is not able to slow down effectively
off_below: 0.10


## Hotend Fan - FAN1
[heater_fan hotend_fan]
pin: PE5
max_power: 1.0
kick_start_time: 0.5
heater: extruder
heater_temp: 50.0
## If you are experiencing back flow, you can reduce fan_speed
#fan_speed: 1.0

## Controller fan - FAN2
[controller_fan controller_fan]
pin: PD12
kick_start_time: 0.5
heater: heater_bed
fan_speed: 0.5

## Exhaust fan - FAN3
[heater_fan exhaust_fan]
pin: PD13
max_power: 1.0
shutdown_speed: 0.0
kick_start_time: 5.0
heater: heater_bed
heater_temp: 60
fan_speed: 1.0
I don't see anything wrong here, so I would suggest double checking that you are connected to the correct location on control board. It is the 4th fan plug, check the polarity, and that the jumper is set for the proper fan voltage. See photo reference. Plugging for NevermoreS.jpg
 

Alan

Member
Thanks. That is where it is connected. I just tried changing it to Fan4/PD14 and still nothing. To double check I've plugged it into the controller fan pin and they spin up. I don't know why can't get power to PD13 or PD14.
 

NoGuru

Well-known member
I am not at home so I can't look at my config but I think the header is wrong. Instead of [heater_fan exhaust_fan] try [fan_generic BedFans]
 

franknitty69

New member
the way you have your config is correct for a bed controlled nevermore. if the fans are not coming on, it is most likely the voltage jumper, the wiring (crimp got pushed out, etc) or the fan port is bad.

Double-check the jumper to make sure it is on the correct pins. One time i swapped from 24v to 12v and i had the jumper hanging off the side (it was only on one of the pins).
 
Last edited:
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