Siemens SIMOTICS XP 1MB1 series - Rolling Bearing Faults; Faults at the External Fan; Deactivating

Operation
8.7 Deactivating
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
109
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.
8.7
Deactivating
Commission any devices provided for protection against condensation after switching off the
machine.