SIEMENS SIMOTICS 1LE8 series low-volt​age high-power motor

1LE8003: Variable frequency voltage ≤ 460V, maximum safe speed 3600rpm (2-pole), frequency exceeding 60Hz requires special dynamic balancing;

1LE8033: Variable frequency voltage ≤ 690V, maximum safe speed 3600rpm (2-pole), peak voltage withstand value 3200Vpp (690V variable frequency), supports field weakening operation, and requires forced cooling when the load torque exceeds the limit.

Selection and Option Configuration

1. Order number rules (16 digit code)

Taking 1LE8003-3AA33-3 □□□□ as an example, the meaning of key positions is:

Explanation of the meaning of digits and example values

1-6 series identification 1LE800/1LE803

7 sub series 3=1LE8003, 3=1LE8033

8-9 aircraft seat number 3A=315, 3B=355

10 poles A=2, B=4, C=6, D=8

11-12 Voltage/Frequency 33=380V Δ/660VY 50Hz

13 iron core length 3=standard length

Installation type A=IM B3, J=IM B35

15 winding protection B=single group PTC, C=double group PTC

16 junction box position 4=top mounted, 5=upper right side, 6=upper left side

2. Core Option List

Option Number Function Description Applicable Scenarios

L22 enhanced cantilever force design (with cylindrical roller bearings at the drive end) for high radial loads (such as belt drives)

F70 independent drive fan running at low/over rated speed

H00 Rainproof Cover Outdoor Installation

Q04/Q02 moisture-proof heating belt (220V, 100W) high humidity/large temperature difference between day and night environment

L97 auxiliary junction box (2 M20 × 1.5 interfaces) with over 24 auxiliary terminals

Q80 warranty extended to 24 months, requiring long-term stable operation scenarios

H20 protection level upgraded to IP65 for dust/water spray environment

Typical application scenarios

1LE8003: General machinery (centrifugal fans, centrifugal pumps, air compressors), food and beverage production lines, and ordinary transmission equipment;

1LE8033: Variable frequency drive (steel rolling mill, crane, paper machine), variable speed load (adjustable speed fan/pump), harsh industrial environment.

Key issue

Question 1: What are the core differences between the LE8003 and 1LE8033 sub series? How to choose in the frequency conversion scenario?

Answer: The core difference between the two focuses on frequency conversion adaptability and protection configuration, and the selection should be based on the frequency conversion voltage, load type, and environmental severity

Comparison of core differences:

Comparison dimension 1LE8003 (universal type) 1LE8033 (frequency conversion specific type)

The upper limit of the frequency conversion voltage is ≤ 460V (with a filter added to the frequency converter end) ≤ 690V (optional N90 special insulation, no filter required)

Insulation usage level: 155 (F) for variable frequency operation, 130 (B) for direct supply, 155 (F) for all scenarios (optimized for variable frequency operation)

Optional insulated bearings (anti stray current) with standard insulated bearings (mandatory to avoid damage from frequency conversion stray current)

Temperature protection optional single group PTC/PT100 standard dual group PTC (145 ℃ alarm+155 ℃ trip, safer)

Suitable for frequency conversion scenarios with low voltage (≤ 460V), light load frequency conversion (such as fan speed regulation), high voltage (≤ 690V), and heavy load frequency conversion (steel/crane)

Selection logic:

If the variable frequency voltage is ≤ 460V, the load is universal speed regulation (such as fan/pump), and the budget is limited, choose 1LE8003 (additional insulation bearing option L27 is required);

If the variable frequency voltage is ≤ 690V, the load is heavy load/harsh environment (such as steel rolling mills, cranes), and high reliability is required, choose 1LE8033 (with standard insulated bearings and dual PTC protection, no additional configuration required).

Question 2: How to calculate the rated power derating of LE8 series motors in high altitude (>1000m) or over temperature (>40 ℃) environments? Please provide examples to illustrate.

Answer: In high-altitude/over temperature environments, the rated power needs to be adjusted through the power conversion factor k-HT, and the formula is:

P adm=P rated x k HT, where P adm is the allowable power, P rated is the rated power, and k − HT needs to be obtained from the table;

K-HT coefficient table (excerpt from key scenarios): | Altitude (m) | Environmental temperature<30 ℃ | 30~40 ℃ | 45 ℃ | 50 ℃ | 55 ℃ | 60 ℃ | | 1000 | 1.07 | 1.00 | 0.96 | 0.92 | 0.87 | 0.82 | | 1500 | 1.04 | 0.97 | 0.93 | 0.89 | 0.84 | 0.79 | | 2000 | 1.00 | 0.94 | 0.90 | 0.86 | 0.82 | 0.77 | | 3000 | 0.92 | 0.86 | 0.82 | 0.79 | 0.75 | 0.70|

Example: Taking 1LE8003-3BA33 (355 base, 2-pole, rated power 355kW) as an example:

If installed at an altitude of 2500m and an ambient temperature of 45 ℃, the table shows k-HT=0.86, and the allowable power P ADM=355 × 0.86 ≈ 305.3kW; if installed at an altitude of 3000m and an ambient temperature of 50 ℃, k-HT=0.79， Allowable power P ADM=355 × 0.79 ≈ 279.5kW; note: After derating, it is necessary to ensure that the actual load power is ≤ P ADM to avoid motor overheating and damage.

Question 3: What are the configurations of the bearing system for LE8 series motors? How to choose a bearing scheme based on cantilever force requirements?