What are the main points to be considered during installation of motors?
Usually, for a motor installation, there will be four points of mounting: One at each corner of the mounting base. Then there will be mounting requirements for the driven load. All mounting points must be on the exact same plane or the equipment will not be level.
What is IEC standard for motor?
IEC Standards for electric motors In short: the International Electrotechnical Commission (IEC) standards are the uniform standards indicating the efficiency classes for electric motors. In 1999, the European Commission established different efficiency classes for electric motors.
How are Motors specified?
Horsepower (HP) measures the amount of power a motor can give defined by torque multiplied by speed divided by 5250 feet pounds. Number two is the rotational speed of the motor measured in time as rotations per minute (RPM). Number three is the electrical pressure measured in Volts.
Why is the frame of an electric motor grounded?
Grounding the motor frame prevents this possibility. Both methods effectively create a solid electrical connection directly to the stator laminations so that any insulation failure is grounded through the ground conductor attached to the motor by the end user. The most common method is to use a grounding connector.
What is the difference between NEMA and IEC motors?
NEMA caters to large-sized devices in North American Markets only. IEC ratings are for more compact devices in the global market. IEC ratings react faster to overloads while NEMA ratings withstand short circuits. IEC devices are safe to the user, while NEMA devices require safety covers.
What is motor life cycle?
Three types of motor have been considered: the synchronous reluctance motor, the permanent magnet assisted synchronous reluctance motor and the induction motor. The assessment of lifecycle has been made in terms of its four stages: manufacturing, distribution, use and end of life.
What do you need to know about motor installation?
A strong working knowledge of installation techniques is vital to the effective operation and maintenance of motors.Today’s modern motors require your consideration of all aspects of selection, application, and maintenance as well as details of assembly, hardware, and the interrelationship of components and materials.
What are the OSHA rules for motor installation?
Pertinent NEC rules, especially Art. 430, and all local safety rules must be observed. In addition, OSHA rules must also be studied and followed during the installation of motors and controls. These regulations are included in Part 1010 of the Occupational Safety and Health Standards.
What should I check when assembling a motor?
Always check the nameplate for proper voltage, phase, frequency, horsepower, etc. Large motors are sometimes shipped disassembled. When assembling, be sure all mating parts are clean. This can be done with a magnet, vacuum cleaner, or dry compressed air (air pressure less than 60 psi).
What’s the proper way to lift a motor?
• Use proper protective gear, care and procedures when handling, lifting, installing, operating and maintaining the motor. • If eyebolts are used for lifting motors, they must be securely tightened, and the direction of the lift must not exceed a 15° angle from the shank of the eyebolt. Do not use eyebolts in an ambient below 0°F.
A strong working knowledge of installation techniques is vital to the effective operation and maintenance of motors.Today’s modern motors require your consideration of all aspects of selection, application, and maintenance as well as details of assembly, hardware, and the interrelationship of components and materials.
Pertinent NEC rules, especially Art. 430, and all local safety rules must be observed. In addition, OSHA rules must also be studied and followed during the installation of motors and controls. These regulations are included in Part 1010 of the Occupational Safety and Health Standards.
What are the NECA standards for electric motors?
NECA 230-2003, “Standards for Selection and Installing of Electric Motors and Motor Controllers” Section 440.22 (A) on rating or setting for individual motor compressors states, “The motor-compressor branch-circuit short-circuit and ground-fault protective device shall be capable of carrying the starting current of the motor.”
Always check the nameplate for proper voltage, phase, frequency, horsepower, etc. Large motors are sometimes shipped disassembled. When assembling, be sure all mating parts are clean. This can be done with a magnet, vacuum cleaner, or dry compressed air (air pressure less than 60 psi).