Description, Technical Data; Scope Of Delivery; Siemens Service Center; Applications - Siemens 1LA8 Series Operating Instructions Manual

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Description, technical data

2.1 Scope of delivery

Checking the scope of delivery for completeness
When you take receipt of the delivery, please check
immediately whether the scope of the delivery matches
up with the accompanying documents. Siemens will not
accept any warranty claims relating to items missing
from the delivery that are submitted later.
Register a complaint about:
– Any transport damage detected immediately with
the delivery agent.
– Any defects/incomplete delivery detected
immediately with the SIEMENS representative
responsible.
These Operating Instructions belong to the scope of
delivery and must be kept where they can be easily
accessed.

2.2 Siemens Service Center

Contact for further information
Details about the design of the three-phase motor
supplied and about the permissible operating conditions
are described in these Operating Instructions.
If you have any questions or suggestions, or if you
require further information, please contact the
Siemens Service Center.

2.3 Applications

Overview
1LA8 three-phase AC machines have been designed
for a very wide range of drive applications and energy
conversion applications. This series distinguishes itself
as a result of its ruggedness, high lifetime and
reliability. Not only this, it is extremely versatile, which
allows it to be optimally adapted to the particular
application and function.
A description of the motor and permissible operating
conditions are specified in this documentation.

2.4 Design of the motor

Standards
The motors are compliant with the following
standards:
• IS: 325: Specification for three phase induction
motors
• IS: 900: Code of practice for installation and
maintenance of induction motors.
• IS: 4691: Degree of protection provided by
enclosure for rotating electrical machinery
• IS: 7816: Guide for testing insulation resistance of
rotating machines.
• IS: 12065: Permissible limits of noise level for
rotating electrical machines.
• IS: 12075: Mechanical vibration of rotating
electrical machines with shaft heights 56mm and
higher – Measurement, Evaluation and Limits of
Vibration severity.
• IEC: 60034-1: Rotating electrical machines – Part 1:
Rating and Performance.
• IEC: 60034-5: Degree of protection for rotating
electrical machines.
Cooling and ventilation
The series 1LA8 motors are totally enclosed fan-cooled
three-phase squirrel cage motors with an internal air-
cooling circuit for cooling.
Located at the non-drive end of the stator housing is
an air intake cowl that guides the external air. The
external air is drawn in through an opening in the air
intake cowl and flows axially across the outer cooling
ribs of the motor frame. The fan impellers for the inner
and outer cooling airflow are mounted on the motor
shaft. The cooling method is as per IC411 (or IC4A1A1)
of IEC 60034-6.
Caution
Normally, external fans for two-pole motors are
unidirectional, and for machines with four or
more poles are bidirectional. Machines with
unidirectional external fans are identified on the
Fan cowl with an additional label showing the
direction of rotation. The internal fans are
generally bidirectional. In the event that the level
of cooling provided by the internal cooling
system is not sufficient it is also possible to attach
a separate fan. This type of fan provides a
sufficient level of cooling irrespective of the
speed of the main motor. Temperature sensors
are integrated in the stator winding to monitor
the winding temperature. Various supplementary
devices can be integrated or mounted,
depending on the order. These include, for
example, anti-condensation heating, bearing
temperature monitoring or other devices.
Rotor and rotor winding
The rotor assembly is pressed onto the shaft together
with the squirrel cage winding. The drive end of the
shaft usually has a cylindrical shaft end.
Storing
The motors are equipped with different types of
rolling-contact bearings depending on the version and
the operating conditions described in the order. The
different types are listed on the lubrication plate of the
motor. In converter operation an insulated bearing is
usually installed on the non-drive end.
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