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LTS Series Long Travel Stages
Motor
These parameters are used to set the 'resolution' characteristics of the stepper motor
connected to the selected channel. The resolution of the motor, combined with other
characteristics (such as lead screw pitch) of the associated actuator or stage,
determines the overall resolution.
Steps Per Rev - The number of full steps per revolution of the stepper motor
(minimum '1', maximum '10000').
Gearbox Ratio - The ratio of the gearbox. For example, if the gearbox has a reduction
ratio of X:1 (i.e. every 1 turn at the output of the gearbox requires X turns of the motor
shaft) then the Gearbox Ratio value is set to X. (minimum '1', maximum '1000').
Persist Settings to Hardware
Many of the parameters that can be set for the LTS series stages can be stored
(persisted) within the unit itself, such that when the unit is next powered up these
settings are applied automatically. This is particularly important when the driver is
being used manually in the absence of a PC and USB link. The potentiometer, and
button parameters described above are good examples of settings that can be altered
and then persisted in the driver for use in absence of a PC. To save the settings to
hardware, check the ‘Persist Settings to Hardware’ checkbox before clicking the ‘OK
button.
Note
The Gearbox Ratio parameter is applicable only to motors fitted with a gearbox.
Note
The ‘Steps Per Rev’ and ‘Gearbox Ratio’ parameters, together with the ‘Pitch’ and
‘Units’ parameters are used to calculate the calibration factor for use when
converting real world units to microsteps. However, the ‘Steps Per Rev’ parameter
is entered as full steps, not microsteps. The system automatically applies a factor of
128 microsteps per full step.
The stepper motors used on the LTS series stages have 200 full steps per rev and
no gearbox fitted. For these stages the Steps Per Rev and Gearbox Ratio
parameters have values of 200 and 1 respectively.
The correct default values for Steps Per Rev and Gearbox Ratio are applied
automatically when the unit is powered up.
Caution
The ‘Persist Settings’ functionality is provided to simplify use of the unit in the
absence of a PC. When the unit is connected to a PC and is operated via
APTUser, the default APTServer settings will be loaded at boot up, even if the
‘Persist Settings’ option has been checked.
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