TMCM-3314 TMCL
™
Firmware Manual • Firmware Version V1.11 | Document Revision V1.10 • 2019-JAN-25
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Load Angle [µSteps](Deviation Current Vector and Encoder)
128(45°)
255(90°)
-128(-45°)
-255(-90°)
Current Value [0..255]
SAP 126
383(135°)
-383(-135°)
255
128
SAP 126
SAP 111
SAP 111
SAP 113
SAP 114
SAP 134
SAP 134
Figure 13: Current Level Control
• SAP 111: Closed Loop Beta
• SAP 126: Closed Loop Start Up
• SAP 113: Minimum Closed Loop Current Scaler
• SAP 114: Maximum Closed Loop Current Scaler
• SAP 134: Positioning Window for Target Reached Flag
Axis parameters #120 and #121 set up the delay which defines how fast the actual current will be increased
or decreased and will follow the red marked graph.
6.3.4
Field Weakening
With every stepper motor the TMCM-3314 will reach a velocity where it is not possible to maintain the
target motor current due to the motor back EMF. Above this velocity load angle (SAP 111, default 90°) and
current level control will reach their maximum. To drive the stepper motor faster the back EMF must be
compensated by commutating the stepper motor with a commutation angle between 90° and 180°. The
parameters for field weakening are described in figure
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