Safety And Application Information; Operation In Locations Subject To Explosion Hazards; Electromagnetic Compatibility - Siemens 1LA8 Series Operating Instructions Manual

1.2 Safety and application information

The safe use of electrical machines
Danger
These electrical machines are designed for use
in industrial power systems.
Rotating or live and uninsulated parts pose a
danger.
There is consequently a risk of fatal or severe
personal injury or substantial damage to
property if the necessary covers are removed
without authorization or if the equipment is
handled improperly, operated incorrectly or
maintained inadequately.
If the motors are used outside industrial areas,
the installation site must be safeguarded against
unauthorized access by means of suitable
protection facilities (e.g. fencing) and
appropriate warning signs.
The persons responsible for the safety of the system
are under an obligation to ensure that:
• The basic planning work for the system and all
work relating to transportation, assembly,
installation, commissioning, maintenance and
repairs are carried out by qualified persons and
checked by responsible, suitably skilled persons.
• These instructions and the motor documentation
are made available at all times while work is in
progress.
• The technical data and specifications relating to the
permissible installation, connection, ambient and
operating conditions are taken into account at all
times.
• The system-specific erection and safety regulations
are observed and personal protective gear is used.
• Work on these machines, or in the vicinity of these
machines, by unqualified persons is prohibited.
These instructions therefore only contain the
information, which is necessary for the motors to be
used by qualified persons in accordance with their
intended purpose.
Note
We recommend engaging the support and services of
your local Siemens service center for all planning,
installation, commissioning and maintenance work.
2
1.3 Operation in locations subject to
explosion hazards
Note
1LA8 Motors are designed and manufactured for
operations in safe zones only
Danger
Binding clarification of the local risks and of any
measures necessary is only possible by the user
of the installation in agreement with the
supervisory authority responsible.
Installation-specific ignition hazards
The criteria for the respective zonal classification are
not harmonized and the assessment of the operational
risks, the local operating conditions and the various
monitoring methods is not uniform. Accordingly, the
remedial measures recommended by the supervisory
authorities also differ in some cases, depending on the
authority's area of responsibility. It is not possible for
the machine manufacturer to issue generally
applicable recommendations in this respect.
Note
Binding clarification of the local risks and of any
measures that should be recommended is only
possible by the user in agreement with the supervisory
authority responsible for the respective installation.

1.4 Electromagnetic compatibility

Instructions relevant for safety
Notice
If the load torque is very irregular (e.g. when driving a
reciprocating compressor) a non-sinusoidal motor
current will be induced whose harmonics might bring
about an excessive reaction on the supply system and
so cause excessive emitted interference on the power
supply connecting leads.
Notice
If operated through a frequency converter, the emitted
interference is varying in strength, depending on the
design of converter (type, interference suppression
measures and manufacturer). In order to avoid
exceeding the limit values on the drive system,
consisting of motor and converter, the EMC
information given by the converter manufacturer must
strictly be observed. On motors with integrated
sensors (e.g. PTC thermistors) it is possible that
interference voltages caused by the converter occur on
the sensor lead.
If using motors with integrated sensors, the operator
himself must ensure sufficient interference immunity
by selecting a suitable sensor signal lead and a suitable
evaluation unit.