User manual

PoStep60 user manual

www.poscope.com

7. Setting files – enables loading/saving driver configuration settings from/to file

a. Load settings from file – load driver configuration settings previously saved.

b. Save settings to file – save currently set configuration to specified file.

8. Device custom name – displays or change driver custom name

a. Read custom name – reads driver name

b. Write custom name – writes and stores driver name

9. Enable/disable advanced driver setup mode – by checking advanced setup mode is enabled

allowing setting advanced parameters

10. Detailed fault description in case of fault detected – further describes detected fault and possible

cause of the fault

11. Reset faults – press the button to reset driver faults

12. DC motor mode – Enable or disable DC motor mode

13. BINx Up/Down – Enable or disable BINx buttons mode

14. Auto run – Enable or disable Auto run mode

15. I2C address – Sets an address of the PoStep60 driver when using I2C communication

7.3 Advanced settings

In stepping motors, current regulation is used to vary the current in the two windings in a sinusoidal

fashion to provide smooth motion. An ultra-smooth motion profile can be achieved using advanced

settings such as blanking and decay time, and various current decay modes, including an auto-mixed

decay mode.

The current through the motor windings is regulated by an adjustable fixed-off-time PWM current

regulation circuit. When an H-bridge is enabled, current rises through the winding at a rate

dependent on the DC voltage and inductance of the winding and the magnitude of the back EMF

present. Once the current hits the current chopping threshold, the bridge disables the current for a

fixed period of time, which is programmable between 500 nS and 128 us. After the off time expires,

the bridge is re-enabled, starting another PWM cycle.

Figure 10: Advanced driver setup settings

WARNING!

The advanced settings shall only be used by a person with a strong knowledge in

motor control. There is a chance of setting combination that may results in

permanent device failure.

NOTE!

When setting up the driver various compromises need to be considered such as:

 Higher the input voltage longer the fixed off time has to be to control the

required current,

 Higher the input voltage lower the step mode,

 …