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SMRA - SSI and BiSS
10 - Troubleshooting
The following list shows some typical faults that may occur during installation
and operation of the magnetic measurement system.
Fault:
The system does not work (no pulse output).
Possible cause:

The ring and/or the sensor are not installed properly. The ring and the sensor
need to be coupled as explained in the mounting instructions. The system
cannot operate if mounted otherwise. For correct installation please refer to
the section “3 - Mounting instructions” on page 11.

Installation does not meet the mounting tolerances between the sensor and
the ring indicated in this guide; the sensor hits the surface of the ring or is
too close to/far from it. Check whether the sensor sensitive part is damaged.

A magnetic part has been placed between the sensor and the magnetic
surface of the ring.

The sensor has been damaged by short circuit or wrong connection (reverse
polarity protection is provided for the version SMRA-xx-2-... only).
Fault:
The measured values are either inaccurate or not provided in the whole
circumference of the ring.
Possible cause:

The sensor is not installed properly on the ring. See the section “3 -
Mounting instructions” on page 11.

The connection cable runs near high voltage cables or the shield is not
connected properly. Check the earthing point.

The frequency of Master clock is set too high or too low and the
transmission cannot be synchronized correctly. See the section “5 - SSI
interface” on page 18.

A section of the magnetic surface has been damaged mechanically or
magnetically; this may cause a failure to read the position or a position
calculation error so that the resulting position value is invalid.

The measuring error is caused by a torsion or plays in the machine structure.
Check for movements in the mechanics of the machine.
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