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.
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
8.9.5 Cooling system faults
The following table shows the possible causes of and remedial measures for faults on water-
cooled machines.
Table 8-4 Cooling system faults
↓ Overheating
↓ Water leaking
Possible causes of faults Remedial measures
X Reduced cooling
● Check the cooling water flow, increase the amount of cooling water
if necessary.
● Clean the cooling system, e.g. by briefly increasing the cooling
water flow rate or by adding suitable cleaning agents.
X Cooling water flow rate too low Consult the manufacturer. If the specified cooling water quality is ob‐
served, the cooling system is maintenance-free.
X Inlet temperature too high Set the correct upstream temperature.
X Cooling water supply switched off Switch on the cooling water supply.
X Cooling water contains too many or unsuit‐
able antifreeze and corrosion-protection
agents
Use cooling water of the agreed quality.
Operation
8.9 Faults
SIMOTICS HV C 1NA14544WA600AG0-Z
72 Operating Instructions 06/2018
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