Homing Motors - THORLABS BBD101 User Manual

Single-Channel Brushless DC Servo Controller

4.3 Homing Motors

The need for homing comes from the fact that on power up the motor (stage) is at a
random position, so the value of the position counter is meaningless. Homing involves
moving the motor to a known reference marker and resetting the position counter to
the associated absolute value. This reference marker can be one of the limit switches
or can be provided by some other signal. The MLS series stages use an electronic
reference marker and therefore the limit switches are not used for reference.
Fig. 4.2 Motor Controller Software GUI
1) Click the 'Home' button. Notice that the led in the button lights to indicate that
homing is in progress.
2) When homing is complete, the 'Homed' LED is lit as shown above.
Note
If a move is demanded on a particular axis, before the axis has been
'Homed' then a Windows 'Event Information' panel is displayed, telling
the user that the axis must be homed before operation.
21