SIEMENS
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Siemens D 83.1 · 2016
1
Introduction
General technical specifications
Degrees of protection and mechanical design
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Overview
(continued)
IP66 shaft seal (optional)
A shaft seal to IP66 is available as an option for motors of the
LOHER CHEMSTAR 1PS series. It comprises an axial ring seal
(Gammaring 9RB). The sealing lip slides over a carefully
prepared metal surface. The contact pressure reduces as the
speed increases. This reduces wear. The metal cage in
combination with the enclosure forms a labyrinth gap which
protects the sealing lip from water jets, dust and mechanical
damage. This mechanical design prevents deposits of water
in the vicinity of the sealing lip.
The shaft seal is suitable for horizontal and vertical motor types
of construction. It is particularly suited to outdoor installations,
especially V3.
IP66/65 degree of protection has been verified for the seal
by DEKRA EXAM. The shaft seal has been successfully
implemented under extreme conditions for 30 years.
LOHER VARIO motors are equipped as standard with a contact-
less, maintenance-free labyrinth sealing system. Degree of
protection up to IP66 can be achieved by means of the special
version with integrated seals. This sealing system is certified in
accordance with the strict requirements for dust explosion-proof
motors (Ex t).
Condensation drainage holes
For motors of frame size 132 and below, condensation drainage
holes are not provided due to the minimal empty internal space
and consequently minimal build-up of condensation. They will
only be implemented in response to a special request. Such a
request must be clearly stated when placing an order. Motors of
frame size 160 and above feature condensation drainage holes
as standard.
The location of the condensation drainage holes depends on the
type of construction. They are located at the lowest point of the
bearing plates. If the drainage holes are not at the lowest point
following installation and commissioning of the motor, new holes
must be drilled accordingly and the existing holes must be
sealed with plugs. For IP55 and IP56 degrees of protection, the
condensation drainage holes are sealed. For motors of the 1PS0
type series, the condensation drainage holes are sealed with a
plug that is compliant with the degree of protection and which
ensures condensation drainage. For motors of the 1PS1 type
series, condensation drainage holes are tightly sealed with a
bolt. The drilled hole must be opened regularly to allow the
accumulated condensation water to drain away.
For the 1PS4, 1PS5 and 1MD5 motor series, condensation
drainage holes cannot be implemented, as this would not
comply with the type of protection "Explosion-proof enclosure".
In the case of vertical types of construction, the hole in the top
bearing plate is sealed with a plug.
G_D083_EN_00025
Metal cage
Sliding surface
Sealing lip
Shaft
Bearing plate
© Siemens AG 2016