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The motors can be used in numerous drive applications with variable-speed drives when they are combined with converter sfrom the MICROMASTER and SINAMICS spectrum.

The wide field of implementation includes the following applications:

• Conveyor systems such as cranes, belts and lifting gear
• High-bay warehouses
• Packaging machines
• Automation and drives

Their large range of line voltages enables them to be used allover the world.

Converter-fed operation up to 500 V +10 % line voltage

The standard insulation of 1LE1 motors is designed such that converter-fed operation is possible at line voltages up to U_rated ≤ 500 V in motor mode. Compliance with the following limit values is essential (voltage values are peak values): U_{phase-to-phase} ≤ 1500 V, U_{phase-to-ground} ≤ 1100 V, voltage rise times of t_s > 0.1 μs. When operating 1LE1 motors at higher line voltages, on converters with a controlled input (e.g. AFE, ALM) or for converter-fed operation with the option of generator mode, the motors must have increased insulation resistance.

Please inquire in this case. For motors with protruding connection cables (order codes R20, R21, R22, R23 and R24), please inquire in the case of converter-fed operation.

During installation, the EMC guidelines must be complied with.

Motors operating with frequency converters offer the user numerous advantages.

The motors feature the future-oriented insulation system DURIGNIT IR 2000 (IR = Inverter Resistant). The DURIGNIT IR 2000 insulation system consists of high-quality enamel wires and insulating sheeting in conjunction with solvent-free resin impregnation.

The motors specially developed for operation on a frequency converter with special insulation are converter-compatible at 500 V (+10 %).

General note

All the data listed in the catalog is applicable for a 50 Hz line supply. With converter-fed operation, the torque reduction factors for constant torque and drives for fans, pumps and compressors must be configured using the "SIZER for Siemens Drives" engineering tool. Higher noise levels must be expected at frequencies other than 50 Hz for motors operating with converters due to the harmonic content of the supply.

Mechanical limit speeds

When the motor is operated at its rated frequency, it is important to note that the maximum speeds are limited by the limits for the roller bearings, critical rotor speed and rigidity of the rotating parts.

Motor protection

A motor protection function can be implemented using the I²t sensing circuit implemented in the converter software.

If required, more precise motor protection can be afforded by direct temperature measurement using KTY-84 sensors or PTC thermistors in the motor winding. Some converters from Siemens determine the motor temperature using the resistance of the temperature sensor. They can be set to a required temperature for alarm and tripping.

Insulation

The insulation of the 1LE motors is designed such that converter-fed operation is possible in motor mode at voltages up to 500 V +10 %. This also applies for operation with a pulse-controlled AC converter with voltage rise times t_s > 0.1 μs at the motor terminals.

All motors with voltage codes 22 and 34 must be operated on a converter under these conditions. For converter-fed operation with the outputs specified in the catalog, the motors are used according to temperature class 155 (F), i. e. in this case neither a service factor > 1 nor an increased coolant temperature is possible (order codes N01, N02 and N03 cannot be ordered).