======DC Motor Control======

DC motor control is implemented in myCNC software, and it useful for certain hardware such as the affordable THC lifters used on certain systems: 

{{:mycnc:dc-motor-control-004.png}}

To turn on DC motor control, head into Settings -> Config -> Technology -> THC, and enable the DC Motor Control option:

{{:mycnc:dc-motor-control-001.png}}

When the checkbox is enabled, the Z+ and Z- buttons send commands to turn on the DC motor instead of controlling the Z axis via pulse-dir. This is also relevant in situations where it appears that the the pulse-dir Z axis does not move and the coordinates do not change despite pressing the buttons - it is then necessary to check whether this option has been incorrectly left enabled. 

Pictured below is the DC motor driver board: 

{{:mycnc:dc-motor-control-003.jpg}}

There are two control signals - direction and PWM voltage (speed) reference signal. 

====Gvariables used for DC control====

^ Name ^ Global variable ^ Description ^ 
| GVAR_SET_THC_PWM | 8970 | Set a PWM number to work with the DC motor |  
^ Value assigned to variable ^ 
| 0 |  | Disable (switch to regular pulse-dir axis) |
| 1 |  | Enable PWM1 |
| 2 |  | Enable PWM2 |
| 3 |  | Enable PWM3 |

^ Name ^ Global variable ^ Description ^ 
| GVAR_SET_THC_PWM_Dir | 8971 | Set a DIR signal number |  

^ Name ^ Global variable ^ Description ^ 
| GVAR_SET_DC_MOVE | 8972 | Give a Jog command, with the recorded variable being the movement speed | 
^ Value assigned to variable ^
| Positive value |  | Movement up |
| Negative value |  | Movement down |
| 0 |  | Stop |