Siemens 1MB115 Installation And Maintenance Manual page 126

Table 6-3 Rolling bearing faults
↓ Bearing overheats
X
X
X
X
X X
X X
X X
X X
X
X
6.6.5 Cooling system - external fan faults
The following table shows the possible causes of and remedial measures for
faults on forced-ventilated machines.
Table 6-4 Cooling system faults
↓ High temperature rise with load
X Wrong direction of rotation
X External fan is not running
X Reduced air flow
126
↓ Bearing "whistles"
↓ Bearing "knocks"
Possible causes of faults
High coupling pressure
Belt tension too high
Bearing contaminated
High ambient temperature
Insufficient lubrication
Bearing canted
Insufficient bearing play
X Excessive bearing play
Bearing corroded
Too much grease in bearing Remove surplus grease.
Wrong grease in the bearing Use the correct grease.
X Friction marks on raceway
X Brinelling or scoring
Possible causes of faults
of the external fan
Remedial measures
Align the machine more accurately.
Reduce the drive belt tension.
Clean or replace the bearing. Check
the seals.
Use a suitable high-temperature
grease.
Grease the bearings as instructed.
Contact the service center.
Contact the service center.
Contact the service center.
Replace the bearing. Check the seals.
Replace the bearing.
Replace the bearing. Avoid any
vibration at standstill
Remedial measures
Check the electrical connections to the
external fan.
Check the external fan and its connections.
Check the air ducts; clean the machine.