General technical specifications of the SIPLUS MICROMASTER 420

Ambient temperature range

-10 … +50 °C

Conformal Coating

Coating of the printed circuit board and the electronic components

Technical specifications

The technical specifications of the standard product apply with the exception of the ambient conditions.

Ambient conditions

Relative atmospheric humidity

5 … 100%,
condensation permissible

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The SIPLUS MICROMASTER 420 inverter is suitable for a variety of variable-speed drive applications. It is especially suitable for applications with pumps, fans and in conveyor systems.

It is the ideal cost-optimized frequency inverter solution. The inverter is especially characterized by its customer-oriented performance and ease-of-use. Its large range of line voltages enables it to be used all over the world.


The SIPLUS MICROMASTER 420 inverter has a modular design. The operator panels and communication modules can be easily exchanged without the need for any tools.

Main features

  • Easy, guided commissioning
  • Modular construction allows maximum configuration flexibility
  • Three programmable isolated digital inputs
  • One analog input (0 to 10 V, scalable) can also be used as a 4th digital input
  • One programmable analog output (0 mA to 20 mA)
  • One programmable relay output
    30 V DC/5 A, resistive load
    250 V AC/2 A, inductive load
  • Low-noise motor operation through high pulse frequencies, adjustable (observe derating if necessary)
  • Protection for motor and inverter

Ordering data

Product No. / Product DescriptionListprice / Your price
SIPLUS MM420 FS A 0.37 kW for medial exposure based on 6SE6420-2UD13-7AA1
SIPLUS MM420 FS B 3 kW for medial exposure based on 6SE6420-2UD23-0BA1
SIPLUS MM420 FS B 4 kW for medial exposure based on 6SE6420-2UD24-0BA1
SIPLUS MM420 FS C 11 kW for medial exposure based on 6SE6420-2UD31-1CA1

Technical specifications

Technical data


Mains voltage and power ranges

200 V to 240 V 1 AC ±10 %

0.12 kW to 3 kW

200 V to 240 V 3 AC ±10 %

0.12 kW to 5.5 kW

380 V to 480 V 3 AC ±10 %

0.37 kW to 11 kW

Power frequency

47 Hz to 63 Hz

Output frequency

0 … 650 Hz, (limitation to 550 Hz in production to comply with legal requirements) 1)

Power factor

≥ 0.95

Inverter efficiency

96 % to 97 % (Further information is available on the Internet at:

Overload capability

Overload current 1.5 x rated output current (i.e. 150 % overload capability) for 60 s, cycle time 300 s

Inrush current

Less than rated input current

Control method

Linear V/f characteristic; quadratic V/f characteristic; multipoint characteristic (programmable V/f characteristic); flux current control (FCC)

Pulse frequency

16 kHz (standard with 230 V 1/3 AC)
4 kHz (standard with 400 V 3 AC)
2 kHz to 16 kHz (in 2 kHz steps)

Fixed frequencies

7, programmable

Skip frequency ranges

4, programmable

Setpoint resolution

0.01 Hz digital
0.01 Hz serial
10 bit analog

Digital inputs

3 fully programmable isolated digital inputs; switchable PNP/NPN

Analog input

1, for setpoint or PI controller (0 V to 10 V, scaleable or for use as 4th digital input)

Relay outputs

1, programmable, 30 V DC/5 A (resistive load); 250 V AC/2 A (inductive load)

Analog output

1, programmable (0 mA to 20 mA)

Serial interfaces

RS-485, optional RS-232

Motor cable lengths

  • without output choke

max. 50 m (shielded)
max. 100 m (unshielded)

  • with output choke

see variant dependent options

Electromagnetic compatibility

Inverter available with internal EMC filter Class A; available as options are EMC filters to EN 55 011, Class A or Class B


DC braking, compound braking

Degree of protection


Operating temperature

–10 °C to +50 °C (+14 °F to +122 °F)

Storage temperature

–40 °C to +70 °C (–40 °F to +158 °F)

Relative humidity

95 % (non-condensing)

Installation altitude

Up to 1000 m above sea level without derating

Standard SCCR
(Short Circuit Current Rating) 2)

100 kA

Protection features for

• Undervoltage

• Overvoltage

• Overload

• Earth faults

• Short circuit

• Stall prevention

• Locked motor protection

• Motor overtemperature

• Inverter overtemperature

• Parameter interlock