ETS-Lindgren 2081 Turntable Series 1.2m/1.5m (Archived) - Manual (Page 28)

Operation MODEL 2080 / 2081 TURNTABLE SERIES
24 © ETS-LINDGREN L.P. – JANUARY 2003
REV C – PN 399228
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-Lindgren 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.
TT CALIBRATION EXAMPLE
The table is set at the 0 degree position. A piece of tape is placed
on the edge of the TT to line up with the edge of the gearbox
cover. The table is stopped when the tape travels exactly 360
degrees around. The display on the 2090 now reads 356.3 degrees
which is recorded.
The table is rotated CCW back to 0. The parameter button is set on
the “C” setting. The “C” digits display 3430. A new “C” setting is
now calculated:
New “C” = (356.3 divided into 360) times 3430 = 3395 (rounded
off)
The decrement the C parameter to 3395 and “ENTER” is pressed.
Then the “current position” button is pressed to get back to
operation mode.
Archived 3/18/10