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FAQ: Add item on TMC2208 being disabled in the middle of a print 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-05-05 13:04:01 -04:00
parent 7fd14848ca
commit cd9e21e3aa
1 changed files with 18 additions and 3 deletions
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21
docs/FAQ.md
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@ -11,9 +11,10 @@ Frequently asked questions
8. [Why can't I move the stepper before homing the printer?](#why-cant-i-move-the-stepper-before-homing-the-printer)
9. [Why is the Z position_endstop set to 0.5 in the default configs?](#why-is-the-z-position_endstop-set-to-05-in-the-default-configs)
10. [I converted my config from Marlin and the X/Y axes work fine, but I just get a screeching noise when homing the Z axis](#i-converted-my-config-from-marlin-and-the-xy-axes-work-fine-but-i-just-get-a-screeching-noise-when-homing-the-z-axis)
11. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart)
12. [Will the heaters be left on if the Raspberry Pi crashes?](#will-the-heaters-be-left-on-if-the-raspberry-pi-crashes)
13. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
11. [My TMC motor driver turns off in the middle of a print](#my-tmc-motor-driver-turns-off-in-the-middle-of-a-print)
12. [When I set "restart_method=command" my AVR device just hangs on a restart](#when-i-set-restart_methodcommand-my-avr-device-just-hangs-on-a-restart)
13. [Will the heaters be left on if the Raspberry Pi crashes?](#will-the-heaters-be-left-on-if-the-raspberry-pi-crashes)
14. [How do I upgrade to the latest software?](#how-do-i-upgrade-to-the-latest-software)
### How can I donate to the project?
@ -197,6 +198,20 @@ a higher speed. So, for a Z axis with a very precise step_distance the
actual obtainable max_z_velocity may be smaller than what is
configured in Marlin.
### My TMC motor driver turns off in the middle of a print
There have been reports of some TMC drivers being disabled in the
middle of a print. (In particular, with the TMC2208 driver.) When this
issue occurs, the stepper associated with the driver moves freely,
while the print continues.
It is believed this may be due to "over current" detection within the
TMC driver. Trinamic has indicated that this could occur if the driver
is in "stealthChop mode" and an abrupt velocity change occurs. If you
experience this problem during homing, consider using a slower homing
speed. If you experience this problem in the middle of a print,
consider using a lower junction_deviation setting.
### When I set "restart_method=command" my AVR device just hangs on a restart
Some old versions of the AVR bootloader have a known bug in watchdog