Specifications

No Output/No Counts

• If there is no mechanical movement, there will be no output. Therefore, verify that the

Accu-Coder

is rotating.

• Check to make sure the proper supply voltage is present. It is best to do this at the

Accu-Coder

end, if possible.

• Verify all wiring between the Accu-coder

, the counter/controller, and the power supply.

• Make sure that the proper signal type (OC, PU, LD, PP) is being used for the

application.

• Verify that the counter/controller is properly installed and operational. Consult the

appropriate User’s Manual if necessary.

• If another Accu-Coder

is available, try it to determine if the encoder is the problem.

Erratic Output/Missing or Extra Counts

 •Electrical: Check for loose wiring connections, ground loops, encoder outputs

incompatible with the counter/controller, a noisy power supply, electrical noise, proper

termination of shields, or a combination of these problems.

• Mechanical: Check for improper alignment, loose coupling, or, if used, slippage in the

measuring belt or wheel.

Counts Indicate Wrong Direction

 • Check for reversed wiring of the quadrature signals. Reverse if needed.

• If differential signals are being used, make sure that both sides are properly wired.

• Note: If an index pulse is being used, reversing the wiring will cause the

reference alignment to change.

Counts In Only One Direction

 •Make sure that the counter/controller is capable of, and programmed for, bi-directional

counting.

• On quadrature units, both channels (A and B) must be present and operational. Check

by using a dual channel oscilloscope.

• Make sure the input selection type programmed into the counter/controller, matches the

Accu-Coder

. If there is a mis-match, the system may not work properly.

Index Pulse Not Working

• The index pulse occurs only once per revolution, and can be difficult to check with a volt

meter. Check index pulses with an oscilloscope.

• The counter/controller may not be capable of detecting the index pulse at higher RPM’s.

Slowing down the rotation may allow for detection of the index pulse.

• Verify wiring.

TROUBLESHOOTING