Industrial / Pumps & Motors
User Manual for Siemens SIMOTICS 1LE0 IE4 Low-voltage Motors
Comprehensive technical guide for Siemens SIMOTICS 1LE0 IE4 low-voltage motors. Includes installation, mechanical and electrical design specifications, connection box configurations, and ordering options.
Quick answers from the manual
Quick answer
- The SIMOTICS 1LE0 series are totally enclosed fan-cooled (TEFC) 3-phase asynchronous motors with IP55 protection, designed for continuous duty (S1) and variable speed applications. p. 3
Key actions
- Rotate connection box p. 7, 10
- Install anti-condensation heater p. 19, 30
First start
- Ensure correct voltage and frequency connection. p. 16, 22
Problems and fixes
Bearing failure
Ensure motor is operated within rated speed and load; use regreasing device if applicable.
p. 13Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Protection Class | IP55 | Standard protection level | p. 3 |
| Insulation Class | 155 (F) | Thermal class | p. 4, 17 |
Where to find it in the PDF
- Overview p. 3
- Mechanical Design p. 7
- Technical Data p. 24
Table of contents
Manual images
Click an image to enlargeQuick Guide from the Manual
The Siemens SIMOTICS 1LE0 series are totally enclosed fan-cooled (TEFC) 3-phase asynchronous motors with IP55 protection. They are designed for continuous duty (S1) and are suitable for general-purpose applications such as pumps, fans, and compressors. These motors comply with ISO, IEC, and GB standards.
Mechanical Design
The connection box is located on the top of the motor housing as standard and can be rotated by 4x90 degrees to allow for cable entry from different directions. The motors feature a grey cast iron frame (RAL 7030). Standard mounting types include IM B3, IM B5, and IM B35.
Cooling and Ventilation
Motors are fitted with a radial flow fan (IC 411). For low-speed operation or high-speed applications exceeding synchronous speed, a separately driven fan (Option F70) is recommended to improve motor utilization and reduce noise.
Electrical Design
The motors are designed for temperature class 155 (F). At rated output with line-fed operation, they can be used in temperature class 130 (B). They are capable of handling overload capacity of 1.5 times the rated current for 2 minutes.
Motor Protection
Various protection options are available, including:
- PTC Thermistors: For thermal overload protection (tripping or alarm/tripping).
- PT100/PT1000 Resistance Thermometers: For precise temperature monitoring of windings or bearings.
- Anti-condensation Heaters: Recommended for motors in humid environments to prevent condensation (Option Q04).
Converter-fed Operation
1LE0 motors are suitable for variable speed applications. When using a converter, ensure the installation guidelines regarding electromagnetic compatibility are followed. For frame sizes 250 and above, insulated bearings are recommended to prevent damage from bearing currents.
Maintenance
Bearing life depends on operating conditions, load, and speed. FS280-355 motors come with re-greasing devices as standard. For motors without re-greasing devices, the grease lifetime is matched to the bearing lifetime under normal operating conditions.
Manufacturer information
Siemens AG
Practical help
Common problems
Motor overheating
Verify if the load torque exceeds the admissible limit. If so, forced ventilation (separately driven fan) is required.
Excessive noise or vibration
Check if the motor is operating above 60Hz (requires special balancing) or if the mounting is rigid. Ensure bearings are properly lubricated.
Condensation inside the motor
Install an anti-condensation heater (Option Q04) if the motor is inactive in a humid environment.
Before use
- Verify that the supply voltage and frequency match the motor nameplate.
- Ensure the mounting type (e.g., IM B3, IM B5) is correct for your application.
- Check that the connection box position is suitable for your cable entry requirements.
- Confirm if a separately driven fan is needed for your specific speed range.
- Check if the environment requires specific protection options like anti-condensation heaters.
Images and diagrams
- The connection box can be rotated 4x90 degrees to accommodate different cable entry directions.
- Mounting diagrams illustrate the physical configuration of feet and flanges (e.g., IM B3, IM B5).
Model compatibility
- Motors are suitable for variable speed drives (VFD).
- Insulated bearings are recommended for frame size 250 and above in VFD applications.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.