Regreasing With Sealing Grease (Option For Increased Degree Of Protection); Servicing; Servicing Instructions; First Service After Installation Or Repair - Siemens 1LA8 Series Operating Instructions Manual

Caution
Greases with different thickening agents and
basic oils must not be mixed.
Only in special cases should deviations be made
from the usual greasing data. The regreasing
intervals should be shortened for instance, if the
motors are operated at ambient air
temperatures higher than originally allowed for,
or if corrosive vapours occur or extremely heavy
contamination is present.
To relubricate, clean the grease nipple and inject
suitable grease stipulated on the lubrication
data plate using a grease gun. The shaft must
rotate so that the new grease can be distributed
throughout the bearing. The bearing
temperature rises sharply at first, and then
drops to the normal value again when the
excess grease is displaced out of the bearing.
The spent grease collects outside the bearing
and must be removed after the bearing has
been lubricated several times, depending on the
specified regreasing intervals. The outer bearing
cover must be removed in order to do so.
Escaping oil at the bearing or oil escaping during
regreasing is an indicator that the space for the
spent grease has been over-filled.
Remove the old grease while overhauling the
machine.
Caution
(Environmental Protection)
Waste grease & Greased cloth - to be collected
as hazardous waste and sent to hazardous waste
disposal facility for incineration.
Note
Motors provided with cylindrical roller bearings on the
drive end sides have very high dynamic capacity. As
per bearing manufacturers, the roller bearing performs
satisfactorily only when it is radially loaded to
approximately 1-2% of its dynamic capacity. In view of
this, the roller bearing may not run smooth when the
motor is run uncoupled or with low radial load (e.g. In
direct flexible couplings).
6.1.3 Regreasing with sealing grease (option for
increased degree of protection)
Relubricating with sealing grease
In order to achieve optimum sealing 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 necessary
relubrication intervals depend essentially on the level
of dirt in the environment and on the ON time of the
motor.
For this reason, they can only be defined taking into
account the respective operating conditions.
The sealing effect during operation is optimum as long
as a small amount of relatively clean grease is forced
out. At the very latest, the chamber must be
relubricated when no more grease escapes through
the joints. The relubrication intervals during stoppages
can be extended accordingly as long as the sealing
grease forced out during relubrication is relatively free
of dirt.

6.2 Servicing

6.2.1 Servicing instructions

Faults
An inspection should be performed immediately in the
event of faults or exceptional operating conditions
which represent an excessive load (either electrically or
mechanically) for the motor (e.g. overload, short
circuit).
Instructions for inspecting rolling-contact bearings
When servicing a motor, it is generally not necessary to
dismantle it. The first time a motor needs to be
dismantled is when the bearings are to be replaced.
Caution
The required regreasing intervals for rolling-
contact bearings are not the same as the
servicing intervals. It is essential to adhere to
them.
Caution
The spent-grease chambers of the rolling-
contact bearings only have enough room to take
up a limited amount of spent grease. When the
grease chamber is full, you must remove the
spent grease before relubricating, because it will
otherwise escape into the inside of the motor.
Escaping oil at the bearing or oil escaping during
regreasing is an indicator that the space for the
spent grease is full.

6.2.2 First service after installation or repair

Service criteria
After approximately 500 operating hours, at the latest
after 1 year
• Check, while the motor is running, that:
– The equipment conforms to the stated electrical
characteristics.
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