VLT® 12-Pulse Drives


Robust and cost effective harmonic solution for the higher power range

The Danfoss VLT 12-Pulse Drive
offers reduced harmonics for
demanding industry applications
above 250 kW.

The VLT 12-Pulse Drive is a high efficiency variable frequency converter which is built with the same modular design as the popular 6-pulse VLT drives. It is offered with similar drive options and accessories and can be configured according to customer need.

Together with the needed 30°-phase
shifting transformer the solution
provides durability and reliability at a
low cost.

Under ideal grid conditions the solution eliminates the 5th, 7th, 17th and 19th harmonics and results in a THiD of around 12% at full load.

The needed transformer makes this
solution ideal for applications where
stepping down from medium voltage
is required or where isolation from the grid is needed.

The Danfoss VLT 12-Pulse Drive
provides harmonic reduction without
adding capacitive or inductive components which often require network analysis to avoid potential system resonance problems.


The perfect solution


•Robust and highly stable in all network and operating conditions


•Natural harmonic cancellation


•Excellent input transient immunity


•Good harmonic current reduction


•No special controls required


•The standard LCP and programming make commissioning easy


•High efficiency thanks to DC link inductors


•Back channel cooling reduces cooling loads and improves the efficiency


•Easy maintenance thanks to the modular design


•The compact design with zero clearance mounting minimizes the use of floor space


Power range :
250 kW - 1.2 MW (FC 302)
315 kW - 1.4 MW (FC 102/FC 202)

Voltage range:
380-690 Vac 50-60 Hz

IP21 / NEMA Type 1
IP54 / NEMA Type 12

Harmonic mitigation performance  : 12% THD

True Power Factor :

Displacement Factor :

PC Software & User Interface:
- Commissioning tool function
- Configuration and installation
  settings function
- User settings and information
- Control panel function
- Data logger and event log function
- Network monitoring and
  measurement function
- Filter load and status function
- Software update function

LCP Regulation:
- UL-fi e. CE marking, cULus
  (UL508C) and c-tick (AS/NZS 2064)
- IEEE519 / EN61000-3-xx harmonic 
  mitigation guidelines
- IEEE587/ANSI C62.41/ EN61000-4-5
  surge immunity
- EN55011 electromagnetic
- EN50178, EN60146 safety/design

Ambient temperature :
-10° C to +45° C, up to 3280 feet above sea level, with relative
humidity of 5% – 85% RH, class 3K3 (functions to be maintained
up to 95% RH not condensing)

Power Fuses :

RFI filtering :
Class A2 RFI; Class A1 RFI optional

Cooling :
Air cooled with primary cooling through back channel

RoHS compliant:
The VLT 12-Pulse Drive is
manufactured with respect for the
environment and comply with the
RoHS directive.