What is the maximum excitation force of the NER (MV) series and how is it adjusted?

The NER (MV) series can produce up to 300 kN of excitation force, depending on the model. The force is adjusted by changing the number or position of eccentric weights on the shaft. Each exciter is supplied with a set of weights that can be added or removed to achieve the desired force. For example, the MV-150 model has a base force of 100 kN and can be increased to 150 kN by adding two additional weight plates. The adjustment must be done symmetrically to maintain balance. Always consult the manual for specific weight configurations and torque values.

What are the recommended maintenance intervals for the NER (MV) exciter?

Under normal operating conditions, grease the bearings every 500 hours of operation. Use a high-quality lithium complex grease with a base oil viscosity of 220 cSt at 40°C. Inspect the seals and eccentric weights every 2000 hours. Replace bearings after 10,000 hours or if vibration levels exceed 4.5 mm/s RMS. In dusty or wet environments, reduce the greasing interval to 300 hours. Always follow the maintenance schedule in the manual to avoid premature failure. Regular vibration analysis is recommended to detect bearing wear early.

Can the NER (MV) exciter be used in explosive atmospheres?

The standard NER (MV) series is not certified for explosive atmospheres. However, we offer an optional ATEX-compliant version with increased protection (Ex d IIB T4) for use in coal mines or chemical plants. This version includes flameproof enclosures, special cable glands, and temperature sensors. The ATEX version has a maximum surface temperature of 135°C and is certified according to Directive 2014/34/EU. Please specify the ATEX requirement when ordering, as lead times may be longer.

What is the typical lead time and warranty for the NER (MV) series?

Standard models are shipped within 4-6 weeks from order confirmation. Custom configurations or ATEX versions may require 8-10 weeks. The warranty covers 24 months from commissioning or 30 months from delivery, whichever comes first. The warranty includes free replacement of defective parts but excludes labor and shipping. We also offer extended warranty options up to 5 years with a preventive maintenance contract. For urgent needs, please contact our sales team for stock availability.

NER (MV) Series Vibrating Screen Exciter

NER (MV) Series – Heavy-Duty Exciter for Mining and Quarry Vibrating Screens

The NER (MV) series vibrating screen exciter is a robust, self-contained vibration source designed for continuous operation in harsh industrial environments. It delivers an excitation force ranging from 10 kN to 300 kN at speeds of 750 to 1500 rpm, making it suitable for medium to large vibrating screens used in mining, quarrying, and coal preparation.

Operating Speed

750-1500 rpm

Motor Power

1.1-75 kW

Protection Class

IP55

Ambient Temperature

-20°C to +40°C

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How Does the NER (MV) Series Exciter Improve Screening Efficiency?

NER (MV) Series Vibrating Screen Exciter Structure Diagram

The NER (MV) series vibrating screen exciter is a precision-engineered component that converts electrical energy into mechanical vibration for screening equipment. It is available in multiple models with excitation forces from 10 kN to 300 kN and operating speeds between 750 and 1500 rpm. The exciter uses heavy-duty cylindrical roller bearings and a forged alloy steel shaft to handle radial loads up to 45 kN and axial loads up to 15 kN. Its grease-lubricated design eliminates the need for oil changes, reducing maintenance to periodic greasing every 500 hours. The housing is made of cast iron GG25, providing high rigidity and vibration damping. This exciter is specifically designed for continuous duty in mining and quarrying, where screens operate 24/7 under high dust and moisture.

Typical applications include primary and secondary screening of aggregates, coal, and minerals, as well as dewatering and sizing operations. The NER (MV) series addresses common pain points such as frequent bearing failures, excessive noise, and high energy consumption. For instance, in a coal preparation plant, the exciter's balanced design reduces dynamic forces on the screen frame, extending the life of supporting springs and structural components. Its IP55 protection and F-class insulation allow operation in ambient temperatures from -20°C to +40°C and humidity up to 95%. The exciter can be mounted in various orientations, making it adaptable to linear, circular, and elliptical motion screens. This flexibility ensures optimal screening performance across different material characteristics.

Compared to other exciters in the same class, the NER (MV) series offers a higher static moment per unit weight, allowing smaller motors to achieve the same excitation force. For example, the MV-150 model delivers 150 kN with a 30 kW motor, whereas many competitors require 37 kW. This translates to energy savings of up to 18% and reduced electrical infrastructure costs. Additionally, the exciter's modular design enables quick replacement of bearings and seals without removing the entire unit from the screen, cutting downtime by up to 40%. The series also includes a range of mounting flanges and shaft extensions to fit most standard screen frames, eliminating the need for custom adapters. With a proven track record in over 500 installations worldwide, the NER (MV) series is a reliable choice for demanding screening applications.

High static moment: up to 300 kN excitation force with motor power from 1.1 kW to 75 kW.
Long service life: bearings rated for 100,000 hours L10h and grease intervals of 500 hours.
Energy efficient: optimized magnetic circuit reduces power consumption by up to 18% compared to conventional exciters.
Easy maintenance: modular design allows bearing replacement in under 2 hours without removing the exciter from the screen.

Technical Specifications

Model		NER2V (MV2)	NER3V (MV3)	NER4V (MV4)
Speed (r/min)		1000	1000	1000
Static Moment (Kg·cm)	min	913	1404	1841
Static Moment (Kg·cm)	max	1331	2566	4016
Max. Force (kN)		146	281	440
Weight (Kg)		210	363	520
Size(mm)	A	508	555	623
	B	530	650	710
	C	490	600	652
	D	12-φ18	12-φ22	12-φ26.5

Core Technical Features and Quantified Advantages

STEP 1

High Excitation Force up to 300 kN

The NER (MV) series generates excitation forces from 10 kN to 300 kN, achieved through a precision-balanced eccentric shaft and heavy-duty bearings. This high force capacity enables efficient screening of coarse and fine materials, even in high-capacity operations. For example, the MV-300 model produces 300 kN at 1000 rpm, suitable for 3-meter-wide screens. The force can be adjusted by changing the eccentric weights, allowing fine-tuning of screening amplitude without replacing the exciter.

STEP 2

IP55 Protection and F-Class Insulation

With IP55 ingress protection, the exciter is dust-tight and protected against water jets, making it ideal for wet screening and dusty environments. The F-class insulation allows winding temperatures up to 155°C, ensuring reliable operation even under overload conditions. This combination extends motor life in harsh conditions, reducing failure rates by up to 30% compared to standard IP44 exciters. The terminal box is also sealed to IP55, preventing moisture ingress.

STEP 3

Grease-Lubricated Bearings for 500-Hour Intervals

The exciter uses high-quality lithium-based grease and double-lip seals to keep contaminants out. Bearing lubrication intervals are 500 hours, which means less frequent maintenance stops. The bearings are cylindrical roller type with a dynamic load rating of 120 kN, providing an L10h life of over 100,000 hours under normal operating conditions. This reduces total cost of ownership by minimizing downtime and spare parts consumption.

STEP 4

Modular Design for Quick Maintenance

The NER (MV) series features a modular construction where the bearing housing, shaft, and eccentric weights can be disassembled independently. This allows bearing replacement in under 2 hours without removing the exciter from the screen frame. The design also includes a self-aligning bearing arrangement that compensates for minor misalignments during installation, reducing assembly time and preventing premature wear. All fasteners are metric and accessible from the outside.