Faults At The External Fan - Siemens SIMOTICS XP 1MB 5/6 Series Operating Instructions Manual

X Too much grease in bearing
X Wrong grease in the bearing
X Friction marks on raceway
X Brinelling or scoring
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
X Wrong direction of rotation of the separately
driven fan
X Separately driven fan is not running
X Reduced air flow
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 11/2023, A5E52779956A
Remove surplus grease.
Use the correct grease.
Replace the bearing.
Replace the bearing. Avoid any vibration at standstill
Remedial measures
Check the electrical connections to the separately driven fan.
Check the separately driven fan and its connections.
Check the air ducts; clean the machine.
Operation
8.6 faults
111