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Siemens 1LA8 Operating Instructions Manual Page 27

Simotics tn series n-compact induction motor.
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Rolling-contact bearing design for "Increased degree of protection" (option)
Improved sealing of the bearing units to prevent dust and water from getting in can be achieved
by positioning a grease chamber ahead of the actual bearing unit. Although the same grease
is used in both cases for reasons of convenience, a distinction is made here between
"lubricating grease" and "sealing grease" because of their different functions.
The spent lubricating grease collects in the space between the bearing housing and the outer
bearing cap. The latter also forms the sealing grease chamber with the labyrinth sealing ring
(optional). The second lubricating nipple containing the grease duct for pressing in the sealing
grease is also located in the outer bearing cap. The chamber is sealed off from the space
where the lubricating grease collects by a V-ring or a V-ring and felt ring combination which
prevents the sealing grease in the chamber from penetrating into the lubricating grease
collecting space. During operation, the sealing grease in the chamber slowly runs out via the
labyrinth and seals it, additionally removing dust from inside and around the outside of the
labyrinth ring.
Terminal box
The terminal box can be arranged either on the left or right of the machine. It is not possible
to change the position to the other side of the machine at a later date.
If you wish to upgrade to the next largest terminal box at a later date, please contact the
Depending on the shaft height, the following terminal boxes are used for connecting the cables:
Table 3-5
Shaft height
315 ... 355
315 ... 450
315 ... 450
315 ... 450
Rotating the terminal box
Depending on the version, the terminal box can be rotated. It can then be rotated through
increments of 90° corresponding to the connection direction.
If required, contact your Service Center (Page 143).
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014
Assignment of shaft heights to terminal boxes
Not for explosion-proof versions
Terminal box


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