Product Overview

The Danfoss 195N2187 (VLT2905PT4B20) is a precision-built frequency converter designed to provide reliable variable speed control for small-scale industrial motor applications. As part of the established VLT 2900 series, this drive is frequently utilized in material handling, small pumps, and conveyor systems where space-saving and consistent torque regulation are mission-critical. By precisely modulating motor frequency, the 195N2187 reduces excessive mechanical strain and lowers energy overhead, serving as a vital component in sustaining optimal equipment performance and extending the service life of motor-driven assets in industrial environments.

Technical Configuration

The 195N2187 utilizes a modular architecture designed for high-density electrical cabinets, focusing on operational longevity and ease of integration into existing control frameworks.

• Hardware Architecture: Engineered for three-phase 380 - 480 VAC power inputs, the unit features a compact chassis that facilitates efficient mounting in tight spaces. Its design prioritizes thermal stability, ensuring consistent operation across a wide range of duty cycles.
• Performance Control: The VLT 2905 provides stable VVC+ (Voltage Vector Control) performance, delivering high starting torque and accurate speed regulation. This allows the drive to handle sudden load shifts without triggering overcurrent or thermal trips.
• System Protection: The internal logic includes robust protection against phase loss, short circuits, and ground faults, providing a necessary layer of security for the connected motor and associated power infrastructure.

Technical Specifications

FAQs

What is the primary difference between the VLT 2900 series and newer Danfoss drives?

The VLT 2900 series is a legacy platform favored for its simplicity and reliability in established systems. While newer drives offer advanced connectivity and fieldbus protocols, the 2900 series remains a standard choice for straightforward, standalone speed control applications where high-level networking is not required.

Is this unit suitable for mounting in an unventilated control box?

No. Like most electronic power drives, the VLT 2905 requires a constant flow of cooling air to maintain internal temperatures within safe limits. If installed in an unventilated box, the drive may suffer from premature component failure due to overheating.

Does this model require a specific startup procedure?

Yes. Upon initial installation, it is recommended to conduct a motor parameter setup. Ensure that the motor nameplate values (voltage, frequency, and current) are correctly entered into the drive's memory to allow the VVC+ algorithms to function with maximum efficiency.

Engineering Guidelines and Best Practices

• Mounting Clearance: Mount the drive vertically to allow for optimal convective cooling. Maintain a minimum of 100 mm of clearance above and below the housing. Avoid placement near heat-emitting components like transformers or contactors.
• Cable Shielding: To ensure compliance with electromagnetic compatibility (EMC) standards and prevent noise interference with control signals, utilize shielded motor cables. Terminate the shield at the drive housing using a 360-degree metallic clamp, ensuring a low-impedance connection to the ground plane.
• Power Isolation: For safety and maintenance, always install a local disconnect switch upstream of the drive. Before performing any work on the motor or wiring, isolate the power and verify that the internal DC bus voltage has dissipated—typically signaled by the off-state of the status LEDs—to prevent electrical shock.