ETS-Lindgren 2090 Controller User Manual

Page 49

Model 2090 Multi-Device Controller

ring (masking tape works well), and set the current position
reading to 000.0.

4. Using

the

STEP keys, rotate the turntable clockwise until it

is again aligned with the mark on the ground ring. For best
results, the last motion should always be in the clockwise
direction to insure that any play in the gearing between the
motor and encoder is accounted for.

5. Record the reading of the display, ignoring the decimal

point (i.e. 360.0 would be 3600). This is the encoder
calibration value. NOTE: If the value is below 3600, the
resolution of the encoder is low and thus the 2090 will not
provide 0.1 degree resolution, even though the display
shows that digit. If the value has gone past 9999, the
encoder has too many counts per meter and the 2090 can
not correct for it. In this case, contact ETS for assistance.

6. Enter this value for the encoder calibration value and reset

the limits and position information.

7. Test the turntable by moving it a complete revolution and

comparing the alignment marks. It may be necessary to
adjust the encoder calibration value up or down slightly
depending on the result. NOTE: When scanning between
limits, it is not uncommon to have a small discrepancy
between the absolute position of the table and the display on
the 2090. This is because reversing the direction of rotation
reverses any gear play between the encoder and the table
top, allowing that play to be visible in the positioning
accuracy.

Refers to the speed setting for variable speed devices when the STEP
(INC/DEC) keys are used.

-1

Disabled. The STEP keys will cause the device to
move at the same speed as the other motion keys.

0-255

Defines the speed setting for motion caused from
the STEP keys. This allows the STEP keys to be
used for fine adjustment at a constant speed, while
having all other motion governed by the selected
speed setting.

This parameter is only visible for variable speed devices. See the
next entry for more information on speed settings.

Revision G– P#399199