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5 Product Overview
5.1 Overview of Drives Systems
Danfoss offers drives in different enclosure types for a wide range of applications.
Standalone AC drives
The Danfoss standalone AC drives are so robust that they can be mounted outside of cabinets virtually anywhere, even right beside
the motor. Equipped for the toughest of environment, they suit any application.
More uncompromising features:
Enclosure sizes with protection ratings up to IP66/UL Type 4X.
Full EMC compliance according to international standards.
Ruggedized and coated PCBs.
Wide temperature range, operating from -25 °C to +55 °C (-13 °F to 131 °F).
Motor cable lengths up to 150 m (492 ft) shielded / 300 m (984 ft) unshielded as standard with uncompromised performance.
Enclosed drives
Danfoss drives are designed with the installer and operator in mind to save time on installation, commissioning, and maintenance.
VLT® enclosed drives are designed for full access from the front. After opening the cabinet door, all components can be reached
without removing the drive, even when mounted side by side.
Several cooling options, including back-channel cooling, provide optimum adaption to the installation location and application.
More time-saving features:
An intuitive user interface with an award-winning local control panel (LCP) and common control platform that streamlines start-
up and operating procedures.
Robust design and advanced controls make Danfoss drives virtually maintenance-free.
Modules
The compact design of the VLT® high-power drive modules makes them easy to fit even in small spaces. Integrated filters, options,
and accessories provide extra capabilities and protection without increasing the enclosure size.
More space-saving features:
Built-in DC-link reactors for harmonic suppression eliminate the need for higher loss external AC line reactors.
Optional built-in RFI filters are available throughout the power range.
Optional input fuses and load share terminals are available within the standard enclosures.
In addition to the many valuable features that the Danfoss drives offer as standard, there are several other control, monitoring,
and power options available in pre-engineered factory configurations.
For more details on the enclosure types, the modularity, and the applications, see the product-specific selection guides on
5.1.1 Filter Options
Filters are often extra components that must be planned for when designing the power drive system. It is important to understand
why and when to use output filters with Danfoss drives.
For more details on output filters, refer to Output Filters Design Guide.
5.1.1.1 Protection of Motor Insulation
The output voltage of the drive is a series of trapezoidal pulses with a variable width (pulse width modulation) characterized by a
pulse rise time, t
r
. When a transistor in the inverter switches, the voltage across the motor terminal increases by a dU/dt ratio de-
pending on:
The motor cable (type, cross-section, length, shielded or unshielded, inductance, and capacitance).
The high-frequency surge impedance of the motor.
Because of the impedance mismatch between the cable characteristic impedance and the motor surge impedance, a wave reflec-
tion occurs, causing a ringing voltage overshoot at the motor terminals. To reduce motor insulation stresses, use either sine-wave
filters or dU/dt filters.
AJ300847815559en-000101 / 130R0337
30 | Danfoss A/S © 2020.09
Product Overview
VLT® AQUA Drive FC 202
Design Guide