Lenze 8200 Vector Selection

Lenze 8200 Vector Inverter System Selection and Engineering Application Guide

Modular design: create systems instead of individual devices

The Lenze 8200 vector frequency converter series covers a wide power range of 0.25 kW to 90 kW and supports 230V (single-phase/three-phase), 400V, and 500V power systems. The core concept is "to create as a system": the inverter body (Base Controller) is combined with functional modules (I/O expansion), communication modules, operation panels, filters, and brake accessories, which can adapt to various application scenarios from simple single machine speed regulation to complex fieldbus networking.

This series supports multiple open-loop/closed-loop modes such as V/f linear/square characteristics, vector control, and sensorless torque control. The output frequency is up to 650 Hz, and the overload capacity is up to 180% of the rated torque for 60 seconds (210% torque for 3 seconds for models above 15 kW), meeting the requirements of high dynamic applications.

Quick Selection Guide: Distinguishing between Normal Operation and Capacity Expansion Operation

Lenze offers two selection paths:

Normal operation: The rated power of the frequency converter matches the rated power of the motor, and is suitable for the vast majority of constant torque or variable torque loads.

Increased rated power operation: allows the use of higher power motors (such as square torque loads for pumps and fans), but must meet specific conditions: specified power supply voltage range, only allows 2 kHz or 4 kHz carrier frequency, and must use approved incoming reactors, fuses, and cable cross-sections.

In the selection table, users need to determine the specific inverter model based on the power supply voltage (1-230V, 3-230V, 3-400V, 3-500V), whether it is equipped with an integrated EMC filter, and the installation method (standard cabinet, cold plate technology, push through technology).

2.1 230V single-phase system (0.25~2.2 kW)

Standard models such as E82EV251K2C200 (0.25kW, without EMC filter) or E82EV251K2C (with integrated filter). For single-phase inputs above 1.5 kW, an incoming reactor (such as ELN1-0250H018) must be used to limit harmonics. During capacity expansion operation, a 0.37 kW frequency converter can drive a 0.75 kW motor, but it needs to be downgraded and used in conjunction with specific reactors.

2.2 400V/500V three-phase system (0.55~90 kW)

The 400V level is the most widely used range. Low power (≤ 11 kW) models such as E82EV551K4C200 to E82EV113K4C200 can use integrated EMC filters or external filters. Medium power (15~45 kW) models such as E82EV153K4B201 typically require an external power filter (such as E82ZN22334B230) or an internal power filter (EZN3Axxxx). High power (55~90 kW) models require the use of ELN3 series incoming line reactors and dedicated brake choppers (EMB9352-E).

Special precautions for 500V system: When the power supply voltage is between 484V~550V, a braking resistor (such as ERBM470R100W, etc.) must be used, otherwise the frequency converter is not allowed to operate (limited version of integrated EMC filter). Therefore, for a 500V power grid, it is recommended to prioritize the use of models without integrated filters (K4C2xx), or confirm that braking resistors have been configured.

Technical data interpretation and derating conditions

3.1 Rated current and overload capacity

The rated output current (Ir) of the frequency converter varies with the carrier frequency. Taking the 400V 7.5 kW model E82EV752K4C as an example:

Ir=16.5 A at 2 kHz, 60 second overload Imax=24.8 A

Ir=10.7 A at 8 kHz, 60 second overload Imax=16.0 A

At 16 kHz, Ir further decreases, and when the radiator temperature approaches the upper limit (-5 ° C margin), it will automatically downshift to 4 kHz.

Engineers must confirm whether the continuous current at the actual carrier frequency can meet the rated current of the motor when selecting, and consider the overload period (1 minute overload+2 minutes base load).

3.2 Environmental derating

When the ambient temperature exceeds 40 ° C, the rated output current needs to be reduced by 2.5%/° C.

When the installation altitude exceeds 1000 meters, the rating will decrease by 5% for every 1000 meters increase.

The frequency converter must be installed vertically, with a ventilation gap of at least 100mm above and below, and can be arranged side by side (with a spacing of 3mm).

Key points of attachment configuration

4.1 Incoming Reactor (Mains Choke)

Incoming reactors can reduce input current harmonics, minimize pollution to the power grid, and extend the lifespan of DC bus electrolytic capacitors. Some models (such as 230V single-phase 1.5 kW and above, 400V 7.5 kW and above) require the use of incoming line reactors. The "Mains choke required" column in the selection table clearly indicates. Commonly used reactors include ELN1-0900H005 (230V single-phase, 9 mH, 5 A) or ELN3-0088H035 (400V, 0.88 mH, 35 A).

4.2 EMC Filters and EMC Grades

The RF interference generated by the frequency converter needs to be suppressed by a filter to achieve Class A (industrial environment) or Class B (residential environment) as specified in EN 55011. Lenze offers three types of filters: