Siemens SIMOTICS XP 1MB155, Руководство по эксплуатации, Страница: 107 / 152

Operation
8.6 faults
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
105
8.6.4 Rolling bearing faults
Damage to rolling bearings can be difficult to detect in some cases. If in doubt, replace the
rolling bearing. Use other bearing designs only after consulting the manufacturer.
Table 8- 3 Rolling 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.
X Too much grease in bearing Remove surplus grease.
X Wrong grease in the bearing Use the correct grease.
X Friction marks on raceway Replace the bearing.
X Brinelling or scoring Replace the bearing. Avoid any vibration at standstill
8.6.5 Faults at the external fan
The following table shows the possible causes of and remedial measures for faults on
forced-ventilated machines.
Table 8- 4 Cooling system faults
↓ High temperature rise with load
Possible causes of faults Remedial measures
X Wrong direction of rotation of the external fan Check the electrical connections to the external fan.
X External fan is not running
Check the external fan and its connections.
X Reduced air flow Check the air ducts; clean the machine.