ODC001 Servo Motor Driver
Note. The Gearbox Ratio parameter is applicable only to motors fitted with a gearbox.
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’).
Notes.
•
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 encoder counts.
•
The Z600 series of DC servo motors have an encoder with 48 counts per rev and a 256:1
reduction gearbox. In this case, the Steps Per Rev and Gearbox Ratio should be set to '48'
and '256' respectively. The equivalent calibration constant is calculated as:
48 x 256 x 2 = 25440 (encoder counts/mm)
48 counts per revolution
256:1 reduction gearbox
0.5mm lead screw pitch
•
The correct default values for Steps Per Rev and Gearbox Ratio are applied automatically
when the APTConfig.exe utility is used to associate a specific stage or actuator type with
a motor channel. See the APTConfig helpfile and the tutorial Section 4.2. for more
details.
Persist Settings to Hardware - Many of the parameters that can be set for the
OptoDCDriver 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 homing parameters and limit switch settings described previously 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.
