Sine Wave Filters FN5420

LC Sine Wave Filter for Motor Drives


LC Sine Wave Filter for Motor Drives

  • Prevention of overvoltage on the motor
  • Reduction of motor noise
  • Reduction of motor losses
  • Increase motor service life
  • Possible to apply long motor cables

Features and Benefits

Converts the rectangular PWM output voltage of motor drives into a smooth sine wave with low residual ripple
Elimination of premature motor damage caused by high dv/dt, overvoltages, cable ringing and motor overheating
Improves bearing life time because of bearing currents caused by circulating currents
Complies with IEC 60034-17* requirements for general purpose motors
Optional with IP20 protective cover

Typical Applications

HVAC applications
Medium voltage applications, deployed in front of the step-up transformer
Retrofit installations with motor drives
Motor drive with long motor cable
Motor drive with multiple motors in parallel

Technical Specifications

Maximum continuous operating voltage

3x530 VAC

Nominal operating voltage

3x480 VAC

Rated currents

2.3 to 1000 A

Overload capability

1.5× rated current for 1 minute, once per hour

Residual ripple voltage


Impedance (Uk)

6% @ 400 V, 50 Hz and rated current

Motor frequency

0...60 Hz (up to 200Hz with derating, see user manual)

Motor cable length

Up to 1'000 m or 2'000 m (see user manual)

Switching frequency

fPWM Min. 2 or 4kHz, max. 16kHz, see filter selection table

High potential test voltage

P –> E 2480 VAC, 1 s

Overvoltage category

OV III (IEC 60664-1)

Pollution degree


Temperature range (operation and storage)

-40°C to +45°C fully operation

+45°C to +100°C (up to 18A) or +70°C (26A and above) derated operation*

-40°C to +70°C transport and storage

Climatic category


Protection category

IP00 (E0XXT versions)

IP20 (E2FXT option, up to 110A version)

Flammability corresponding to

UL 94 V-2

Design corresponding to

Filter: UL 61800-5-1, EN 61800-5-1

Chokes: EN 61558-2-20 or EN 60076-6

MTBF (Mil-HB-217F)

>500,000 h @ 40°C/480 V

* Iderated = Inominal*SQRT((Tmax-Tamb)/(Tmax-Tnominal)) - please refer to user manual for details and example

Typical electrical schematic


Approvals & Compliances

CE Label
RoHS Label
UKCA Label
UL Recognized Label (USA)