RBS-T Linear Encoder Installation Manual and Owner’s Guide
P/N 70000426
Page 34 of 43
All rights reserved. Subject to change without notice.
03-Nov-98
Connecting the Linear Encoder
The X and Y-axis cable connectors are both keyed the same way. Be sure to connect each
cable to the correct connector (connectors on the back of the DRO are marked with raised
letters). Plug the connector into the port and tighten both the thumbscrews until secure.
Perform this procedure when also connecting the Computer Numerical Control (CNC).
When routing each cable, position the machine so the reader head is as far away from the
Digital Read Out (DRO) as possible. Each cable should be neatly tie-wrapped so enough slack
remains to prevent tension anywhere along the cable. Arrange the cable so it cannot be
pinched or crushed by any moving parts. Do not drape the cable across open spaces any more
than necessary. Avoid putting any sharp bends or kinks in the cable.
CAUTION: Be sure sufficient slack is left in the cables to permit the full range of up
and down knee travel.
Testing the Encoder
1. Connect the encoders to an active DRO.
2. Move the table (or saddle) to the dead stop position closest to the machine column.
3. Set the indicator to measure the position of the rear face of the table (or saddle).
4. Set the DRO and the indicator to “0”.
5. Cycle the table (or saddle) through its full range of travel and back to the original position
as determined by the indicator.
6. Verify the DRO and indicator both read “0” again.
7. Repeat this procedure for the other axis.
NOTE:
This procedure can be applied to check encoder accuracy with many setup
variations. When checking the encoders, always approach the “0” position from the same
direction. This prevents reversal errors. Position errors are usually caused by encoder or
head misalignment.
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