LOHER low-voltage motors
LOHER low-voltage motors
Overview
Tailored ex motors
No matter how tough the requirements, we provide the right motor. Our explosion-proof LOHER Motors are available in all common types of protection, also with double protection for particularly high explosion hazards. As a result, these low-voltage motors are also suitable for plants subject to explosion hazards, for example deep-sea mining of natural resources, in the chemical or petrochemical industries. They are also safe to use in tunnels or mining.
Non-Ex Motor
LOHER motors in Non-Ex
LOHER motors in Non-Ex
Motors that operate in a “safe” or “non hazardous” environment (there is no explosive atmosphere) are designated with the “Non-Ex” degree of protection. As a consequence, these motors do not have, neither do they require, special mechanical and electrical protection against explosive gases, vapors or dusts as there is no danger of explosion. Generally, these are motors that are used for normal applications, for instance in production plants and systems or process equipment in factories (conveyor belts / elevators – cranes / escalators / water pumps, …). Also in this case, Loher always precisely adapts its drive solutions to the application-specific requirements so that these motors enjoy worldwide acceptance.
Ex nA Motor
LOHER Motors in Ex nA
LOHER Motors in Ex nA
Regarding explosion protection, for Ex nA II motors, the risk of arcing and sparking or hot surfaces during normal operation is prevented with an appropriate motor design therefore guaranteeing the required degree of safety. Motors with type of protection “non sparking nA” are used in explosive atmospheres, whereby, this atmosphere may occur in a potentially hazardous quantity. These motors are assigned to equipment group II – Category 3G (this corresponds to Zone 2). Loher Ex nA II motors are certified and optimally adapted for use in hazardous Zone 2 according to EN 50014 and EN 50021 or EN 60079-0 and EN 60079-15. They are stamped with II 3 G Ex nA II according to EC Directive (94/9/EC). The EC Declaration of Conformity documents that these regulations have been complied with.
What is worth noting: According to EN 60079-15:2005, a risk assessment must be made for all motors with rated voltages above 1 kV. Loher has successfully completed the type test for the stator and rotor according to EN 60079-15:2005. As a consequence, normally no additional measures are required up to 11 kV. With Loher motors, the complex purging process before the motor is started can be eliminated. When required, Ex nA motors also fulfill regulations relating to dust explosion protection according to EN 50281-1-1 // EN 50281-1-2. They are then additionally designated and documented with an EC type test certificate if the motors are operated in an environment with conductive dust. For variable-speed drives (converter operation), a type test must be performed with the actual converter intended for the application.
Ex e Motor
LOHER Motors in Ex e
The basic idea behind this type of protection against explosion is to avoid the generation of sparks and arcs or excessively high motor temperatures by applying a series of measures so that there is no possibility of ignition in the first place. In addition, a suitable monitoring device is always required that even under fault conditions (e.g. locked rotor) avoids any ignition.
Motors with type of protection “increased safety e” are located in an explosive atmosphere, whereby, this atmosphere may occur in a potentially hazardous quantity. These motors are assigned to equipment group II – Category 2G (this corresponds to Zone 1). They guarantee a high degree of safety.
Loher Ex e motors are certified and optimally adapted for use in hazardous Zone 1 according to EN 50014 and EN 50019 or EN 60079-0 and EN 60079-7. They are stamped with II 2 G Ex e II according to the EC Directive (94/9/EC). An EC type test certificate guarantees that the regulations are always maintained. Ex e motors also fulfill – if required – the regulations relating to explosion dust protection according to EN 50281-1-1 // EN 50281-1-2 and are then correspondingly additionally type tested and documented with an EC type test certificate if the motor is to operate in an environment with conductive dust.
Ex d(e) Motor
LOHER Motors in Ex d(e)
Motors with this type of protection against explosion are designed so that a possible explosion remains restricted to the inside of the motor. This means that the enclosure must be able to withstand the pressure from an explosion. In order to define the hazard as a result of an explosive gas (in comparison to other degrees of protection), in addition to the ignition temperature, it is also necessary to specify the capability of an igniting flame to be transmitted through a narrow gap in the motor enclosure. This is realized by classifying them in explosion groups IIA, IIB, IIC.
Motors with type of protection “flameproof enclosure d” are located in an explosive atmosphere, whereby this atmosphere may occur in a potentially hazardous quantity. These motors are assigned to equipment group II – Category 2G (this corresponds to Zone 1). They guarantee a high degree of safety. Loher Ex d(e) motors are certified and optimally adapted for use in hazardous Zone 1 according to EN 50014, EN 50018, EN 50019 or EN 60079-0, EN 60079-1 and EN 60079-7. They are stamped with III 2 G Ex d IIB, II 2 G Ex d IIC according to the EC Directive (94/9/EC). (When the terminal box is designed and constructed to comply with increased safety, they are stamped with II 2 G Ex de IIB, II 2 G Ex de IIC.) An EC type test certificate always guarantees that the regulations are maintained and complied with.
Ex d(e) motors also fulfill, if required, the regulations relating to dust explosion protection according to EN 50281-1-1 // EN 50281-1-2 and are then correspondingly additionally type tested and documented with an EC type test certificate if the motor is to be operated in an environment with conductive dust.