CAT01 Rev.1 23/10/02
2
7
THREE-PHASE MOTORS
Sizes 63 – 280
Instructions and safety information
The motors which are the subject of these “instructions” are components designed for use in
industrial areas
(machines/plants) and therefore cannot be treated as retail goods.
This documentation consequently contains information that is only suitable for use by qualified personnel. It must be used in
compliance with the regulations, laws and technical standards in force and cannot under any circumstances take the place of
plant safety procedure or additional regulation, including any which are not legally enforceable, which have been issued with
the scope of ensuring safety.
Machines built to customer specifications or with constructional differences may differ in detail from the motors described
herein. If you encounter any difficulties please do not hesitate to contact ALPHA, specifying:
-
the type of motor
-
the full motor code number
-
the serial number
General safety warning
DANGER
Electric rotating motors have dangerous parts: when operating they have live and rotating
components. Therefore:
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improper use,
-
the removal of protective covers and the disconnection of protection devices,
-
inadequate inspection and maintenance,
can result in severe personal injury or property damage.
The person responsible for safety must therefore ensure that the machine is transported, installed, operated, maintained
and repaired
by qualified personnel only
, that must have:
-
specific training and experience,
-
knowledge of applicable standards and laws,
-
knowledge of the general safety regulations, national and local codes and plant requirements,
-
the skill to recognise and avoid possible danger.
All maintenance and inspection operations must be carried out only with the authorisation of the person
responsible for safety, with the machine at a standstill, disconnected from the supply (including the auxiliary
circuits such as the anti-condensation heaters).
As the electric machine is a product to be installed in industrial areas,
additional protective measures must be taken and
assured by the person responsible for the installation, if stricter protection conditions are required.
As the electric motor is a component to be coupled to another machine, it is the responsibility of the installing engineer to
ensure, during operation, proper protection against the risk of contact with bare rotating parts and to prevent people or things
from approaching the machine.
If the machine shows deviations from the normal performance (higher power input, increase in temperature, noise and
vibrations) promptly advise the personnel responsible for maintenance.
1. Description
These instructions refer to three-phase squirrel-cage motors, fan cooled type for low voltage supply, manufactured according
to the standards indicated on the name plate.
Degree of protection
The protection degree of motors is shown on the name plate.
Noise level
The information refers to a wide range of motors and type variants. The noise emission data referring to specific size,
construction and speed are mentioned in catalogues and in product documentation, and are within the limits stated by the
standards.
Bearings
The standard motors with shaft height 63-160 are normally equipped with ball bearings. The axial positioning of the rotor is
obtained by a preload spring located at N-end. They are usually supplied without regreasing devices.
The standard motors with shaft height 180-280 have a ball bearing as rotor locating bearing at N-end. They are normally
equipped with regreasing devices.
On the nameplate are indicated the standard motor bearings. The bearing types of special construction motors are given on
proper plates or may be read directly on the outer ring of the installed bearing.
Accessories
According to the customer’s order the motors can be equipped with accessories, as anticondensation heaters, thermistors,
fan unit, etc..
2. Transport and storage
The motor shall be carefully inspected at the arrival in order to verify if damages occurred during transport; if any, they
should be referred directly to the haulier.
The motors have one or more lifting eyes for lifting and handling.
