Seth,
From the Siemens technical information document:
Raceway monitoring detects incorrect positioning of the Z axis with respect to the raceway during motion of the star. This is done by monitoring the current drawn by the Z axis while the star is turning. If the current exceeds a particular value, the following error message is issued: "3564 Raceway monitoring triggered" This incorrect position can lead to early damage of the raceway. If raceway monitoring is triggered, a reference run is automatically carried out after the board has been completed. This can compensate for the incorrect position of the Z axis. If raceway monitoring constantly triggers, however, this indicates permanent incorrect positioning of the Z axis. The following are possible causes: • Incorrect setting of the top Z limit stop (see TI 10C06014) • Incorrect setting for the P gain or tacho of the Z servo • Belt tension of the Z axis belt too low (280 Hz ± 10Hz) • Faulty Z axis motor • Faulty servo card • Previously damaged raceway or Z axis aperture • Damaged Z axis guide
Raceway monitoring is an aid to the operator or service engineer in order to take preventive action to avoid damage to the raceway and the Z axis guide.
This should point you in the right direction.
Lloyd
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