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Information on the correct wiring of the inverter to the motor should be obtained from the inverter manufacturer.
The interference generated by electronic power devices such as industrial inverters, can influence equipment sensitive to interference, suchas industrial computers, industrial load cells, photocells, temperature regulators, magnetic intrusion switches, or capacitance grounding circuits, andcontrol wiring.Whenever it is necessary to reduce the interference caused by the inverter the following practical suggestions should be implemented.Disturbances are highest nearby the inverter, and can be attenuated by increasing the distance. Sensitive devices should be keptat least 50 cm from the frequency converter. The power wiring should be kept at least 50 cm away from the control wiring. Use
power cables as short as possible. Power cables longer than 10 m is a strong source of disturbances, and can cause malfunctions.An Emi filter may be necessary on the power supply line. GENERAL CHARACTERISTICS Balancing MGM brake motors are balanced with a half key applied to the motor shaft ends, according to the IEC standard 34-14 (CENELECHD-53.14S1, CEI 2-23). Reducing vibrations is important both to avoid motor damage, especially to the bearings, and to avoid
damage to the machinery to which the motor is coupled. It is advisable to balance the parts of the attached machinery (the coupling,the pulleys, etc.) in order to avoid vibrations. The maximum permissible vibration intensities for different frame size, according tothe norm IEC 34-14, can be seen in the table below. As standard motors are supplied with normal class balancing, upon request
they can be supplied with reduced or special class balancing. Class Rated speed (RPM) Effective maximum values of vibration speed (mm/s) depending on frame size H56 mm H 132 mm132 mm H 225 mm N (Normal) 600 n 3600 R (reduced) 600 n 18001800 < n 0.711.120.450.710.711.122.81.121.81.8 3600 S (Special) 600 n 18001800 < n 3600 Noise The noise of a running electric motor is mainly generated by the magnetic field, the bearings and the industrial cooling system. The most relevantnoise level is generated by the cooling fan. Technical data sheets report the values of the sound pressure in dB (A) according to ISO1680. The above mentioned values should be increased by about 3-4 dB on motors operating at 60 Hz. On request it is possible to
provide motors with low noise level. During the braking action the noise level depends on the air gap (distance between the brake coiland the brake moving element). Periodic air gap adjustment provides lower noise levels. 17
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