We ensure the right, infinitely variable speed!

Performance counts, and our frequency converters have something “in store”.

We can offer you MICROMASTER, MICROMASTER Vector and the MIDIMASTER Vector – and thus technology at its best.

Micromaster 440 · Micromaster 420 · Micromaster 410

MICROMASTER 420 – The universal unit to meet every challenge


Micromaster 420Do you need a frequency converter, which can be adapted to your individual requirements without major effort? No problem for our MICROMASTER 420 – the universal unit for 3-phase networks and optional field bus connection. Thanks to its modular design, a wide variety of options can be added to the comprehensive standard functions.

And this does not require any tools, as the control panel and communications modules can be easily unplugged. Screwless control terminals – as with the rest of the family – make for perfect connections.

Typical applications:

Conveyor belts, material conveying, pumps, fans, mechanical engineering.

Its strengths in brief

  • Compact housing
  • Very easy installation
  • Versatile inputs/outputs
  • FCC control (flux-current control) for high drive quality even with changing loads
  • Various commissioning options via control panel or free software tool
  • Modular system of converter options
  • Parameterisable acceleration/deceleration times (0 to 650 s)
  • Compound braking for controlled rapid braking
  • 4 skip frequencies to protect the machine against resonances
  • Automatic restart
  • Switch on to running drive without damaging the motor
  • Prepared for use on IT networks
  • Integral protection/overload function
  • Available with and without integral EMC filter
Overview of equipment

Voltage and power ranges:

200 – 240 V, ± 10 %, 1 AC, 0.12 – 3 kW

200 – 240 V, ± 10 %, 3 AC, 0.12 – 5.5 kW

380 – 480 V, ± 10 %, 3 AC, 0.37 – 11 kW

Operating temperature:

-10 – +50 °C

Process control:

Internal PI controller

Control types:

FCC (flux-current control), multipoint characteristic (parameterisable U/f characteristic), U/f characteristic


3 digital inputs, 1 analogue input


1 analogue output, 1 relay output

Connection to automation systems:

The ideal partner for your automation tasks, both for connection to the SIMATIC S7-200 and also integrated in TIA systems with SIMATIC and SIMOTION