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Sealing The Rolling-contact Bearings ("increased Degree Of Protection" Option) - Siemens 1LA8 Operating & Installation Instructions Manual

Low-voltage motor simotics tn series n-compact.
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Regreasing roller bearings
Pay attention to the instructions on the lubricant plate.
1. Rotate the shaft when regreasing, so that the new grease can be distributed throughout
2. Clean the grease nipple before regreasing. Gradually press in an appropriate type and
3. The used grease collects outside each bearing in a spent grease chamber.
Lubricating roller bearings prior to commissioning
When properly stored prior to commissioning for a longer period of time, normally the grease
in the bearings does not deteriorate within two years. Please note the information regarding
long-term storage.
When commissioning, the bearings must be relubricated with twice the amount of lubricating
grease. When doing this, the shaft must rotate so that the grease is replaced in the bearings.
Overheating of the rolling bearings
If the roller bearings are not regularly regreased, local overheating may be possible, and, as
a consequence, an explosion in an explosive atmosphere. This can result in death, serious
injury or material damage.
● Regrease the roller bearings regularly according to the lubrication plate.
● Implement bearing temperature monitoring if not yet in existence.
9.1.9

Sealing the rolling-contact bearings ("Increased degree of protection" option)

Relubricating the grease tank
In order to achieve optimum sealing of the rolling contact bearings and to reliably seal the
labyrinth joints with grease, the chamber must be relubricated at regular intervals. The
procedure is the same as that for lubricating grease. The sealing effect during operation is
optimum as long as a small amount of relatively clean grease is forced out.
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 08/2017
the bearing.
Motors that are operated with converters: Regrease the bearings at a low to medium speed
(n
= 250 rpm, n
= 3600 rpm) to ensure an even distribution of grease.
min
max
WARNING
Rotating components
The shaft must rotate to allow the grease to be distributed. This can result in death, serious
injury or material damage.
● When regreasing, pay attention to all rotating components.
amount of grease, as stamped on the lubricant plate and specified in these operating
instructions.
The roller bearing temperature rises sharply at first, then drops to the normal value again
when the excess grease is displaced out of the bearing.
WARNING
Maintenance
9.1 Inspection and maintenance
113

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