Siemens 1NB1402-2AA84-4CA0-Z, Operating And Installation Instructions

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8.9.3 Mechanical faults
Table 8-2 Mechanical faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults Remedial measures
X Rotating parts grind Establish the cause and realign the parts.
X Stator or coupling not balanced. Disconnect the stator or coupling and rebalance.
If the machine has two shaft ends, and a transmission element is
only fitted to one end, secure the fitted key at the other end to prevent
it from being thrown out. If the rotor has balance type "H" (standard
type), the fitted key must be cut back to roughly half of its length.
X Rotor out of true, shaft bent Consult the manufacturing plant.
X X Poor alignment Align the machine set; check the coupling.
(1)
X Coupled machine not balanced Rebalance the coupled machine.
X Shocks from coupled machine Investigate the coupled machine.
X X Uneven running of gear unit Fix the gearing.
X X Resonance of the overall system com‐
prising motor and foundation
Stabilize the foundation following consultation.
X X Changes in foundation Establish the cause of the changes and eliminate them if necessary;
realign the machine.
(1)
Take any changes into account when warming up the machine.
8.9.4 Roller bearing faults
Damage to roller bearings can be difficult to detect in some cases. If in doubt, replace the
bearing. Use other bearing designs only after consulting the manufacturer.
Table 8-3 Roller bearing faults
↓ Bearing overheats
↓ Bearing "whistles"
↓ Bearing "knocks"
Possible causes of faults Remedial measures
X High coupling pressure Align the machine more accurately.
X Belt tension too high Reduce the drive belt tension.
X Bearing contaminated Clean or replace the bearing. Check the seals.
X High ambient temperature Use a suitable high-temperature grease.
X X Insufficient lubrication Grease the bearings as instructed.
X X Bearing canted Contact the Service Center.
X X Insufficient bearing play Contact the Service Center.
X Excessive bearing play Contact the Service Center.
X X Bearing corroded Replace the bearing. Check the seals.
Operation
8.9 Faults
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
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Operating Instructions 06/2018