Danfoss VACON ® NXP and VACON ® NXC series AC frequency converter

5.1 Design Features

Durable and sturdy: Equipped with a welded Rittal TS8 rack, it has undergone type testing and is suitable for harsh working conditions.

Compact structure: One of the most compact inverter cabinets on the market, suitable for installation in small spaces.

Thermal management optimization: There is no need to install additional cooling fans inside the IP21/IP54 box. It adopts a sliding rail and tractor fixture design, making it easy to pull out the power supply unit for maintenance.

EMC certification: Compliant with EN 61800-3 standard, ensuring stable operation of the frequency converter without interference to other electrical equipment.

Easy to operate: The cabinet door is equipped with a keyboard and optional space for indicators, instruments, and switches.

5.2 Specification of 6-pulse power supply cabinet (taking 380-500V as an example)

Inverter model: low overload current (A), high overload current (A), motor power (kW), frame size dimensions (mm)/weight (kg)

NXC 0385 385/424 300/450 200/160 FR10 606×2275×605/403

NXC 1150 1150/1265 1030/1545 630/560 FR13 1406×2275×605/1000

NXC 2150 2150/2365 1940/2910 1200/1100 FR14 2806×2275×605/2440

6. VACON ®  NXC low harmonic frequency converter

For applications that require meeting the strictest power quality requirements, VACON ®  The NXC low harmonic frequency converter provides an ideal solution. It not only controls the total current harmonic distortion (THDi) below 5%, but also provides regenerative braking and boost functions to maximize output power.

6.1 Technical advantages

Clean electrical energy: THDi<5%, in compliance with international harmonic standards such as IEEE-519 and G5/4.

Cost savings: No need to purchase expensive 12 pulse or 18 pulse transformers, power transformers, protection devices, and power line specifications can be determined based on actual active power, reducing input component capacity.

Regeneration function: It can re feed braking energy to the power grid, saving energy costs.

Boost function: Maintain output during voltage fluctuations in the power grid, maximizing output power.

Suitable for renovation projects: No significant changes are required to the existing power distribution system.

6.2 Hardware Configuration

The low harmonic frequency converter comes standard with an active front end (AFE), which includes hardware configurations such as IP21/IP54 protection level, EMC L-level filter, bottom or top cable entry, input fuse, circuit breaker, input contactor, etc. It can also be equipped with output filtering devices such as common mode filter, du/dt filter, sine wave filter, etc.

6.3 Low harmonic cabinet specifications (taking 380-500V as an example)

Inverter model: low overload current (A), high overload current (A), motor power (kW), frame size dimensions (mm)/weight (kg)

NXC 0385 385/424 300/450 200/160 AF10 1006×2275×605/700

NXC 1150 1150/1265 1030/1545 630/560 AF13 2206×2275×605/1950

NXC 2150 2150/2365 1940/2910 1200/1100 AF14 4406×2275×605/3900

7. Overview of Technical Data

7.1 General Technical Specifications

Project specifications

Input voltage 208~240V; 380~500V；525~690V； -10%~+10%

Input frequency 45~66 Hz

Output frequency 0~320 Hz

Control performance open-loop vector: speed control 0.5%, dynamic 0.3% sec; Closed loop vector: speed control 0.01%, dynamic 0.2% sec

Switching frequency NX_2/NX_5:1~16 kHz; NX_6：1~6 kHz

Working temperature -10 ° C to+50 ° C (high overload); -10 ° C to+40 ° C (low overload)

100% load below 1000m altitude, with a capacity reduction of 1% for every 100m increase above 1000m

Functional safety STO (standard): SIL2, PL d; SS1 (optional): SIL2, PL d

7.2 EMC rating

EMC level corresponds to the applicable environment of the standard

C (Category C1) EN 61800-3, Category C1 Hospitals, Residential Areas

H (Category C2) EN 61800-3, Category C2 Commercial and Light Industrial Zones

L (Category C3) EN 61800-3, Category C3 Heavy Industry Zone

T low grounding current solution for IT power grid

8. Product selection and ordering

VACON ®  NXP and NXC frequency converters are ordered using a type code system, and users can customize according to their required power, voltage, protection level, EMC level, input/output configuration, option board, etc. When selecting, special attention should be paid to:

Power and overload capacity: Select low overload (IL) or high overload (IH) specifications based on the rated power and actual load characteristics of the motor.

Environmental conditions: Choose IP21, IP54 or higher protection level according to the installation environment, considering the impact of environmental temperature on capacity reduction.

Electromagnetic compatibility: Choose C1, C2, C3 or T-class EMC filters according to the power grid environment.

Input topology: Choose 6-pulse, 12 pulse, or active front-end (AFE) scheme according to harmonic requirements.

Functional safety: Select STO or SS1 function according to safety circuit requirements.

Communication and I/O: Select the required fieldbus or Ethernet protocol option board based on the automation system.