Tt calibration example – ETS-Lindgren 2087 Electric Powered Turntable 2 & 3 Meter Models (Archived) User Manual

Page 20

Operation

MODEL 2087 TURNTABLE SERIES

REV C – PN 399233

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.

The table is rotated from 0 to 360 and the mark is now within one
degree of being one full TT revolution. Calibration is complete.

Archived 3/18/10