The MICROMASTER 430 inverter is suitable for a variety of variable-speed drive applications. Its flexibility provides for a wide spectrum of applications. It is especially suitable for use with industrial pumps and fans.

The inverter is especially character­ized by its customer-oriented performance and ease-of-use. It has more inputs and outputs than the MICROMASTER 420, an optimized operator panel with manual/automatic switchover, and adapted software functionality.


The MICROMASTER 430 inverter has a modular design. The operator panels and communication modules can be easily exchanged.

Main characteristics
  • Easy, guided start-up
  • Modular construction allows maximum configuration flexibility
  • Six programmable isolated digital inputs
  • Two scaleable analog inputs (0 V to 10 V, 0 mA to 20 mA) can also be used as a 7th/8th digital input
  • Two programmable analog outputs (0 mA to 20 mA)
  • Three programmable relay outputs
    30 V DC/5 A, resistive load
    250 V AC/2 A, inductive load
  • Low-noise motor operation thanks to high pulse frequencies, adjustable (observe derating if necessary)
  • Protection for motor and inverter
  • Control of up to three additional drives on the basis of PID control (motor staging)
  • Operation of drive directly on mains (with external bypass circuit)
  • Low-energy mode
  • Detects dry run of pumps (belt failure detection)
Options (overview)
MICROMASTER 430 7.5 kW to 90 kW
  • Line commutating chokes
  • Output chokes
  • LC filter and sinusoidal filter
  • Gland plates
  • Basic Operator Panel 2 (BOP-2) for parameterizing the inverter
  • Communication modules
    • DeviceNet
    • CANopen
  • PC connection kits
  • Mounting kits for installing the operator panels in the control cabinet doors
  • PC start-up tools, executable under Windows 98/NT/2000/ME/XP Professional
  • TIA integration with Drive ES
International standards
  • The MICROMASTER 430 inverter complies with the requirements of the EU low-voltage guideline.
  • The MICROMASTER 430 inverter has CE marking.
  • Acc. to UL and c UL certified
  • c-tick
Mechanical features
  • Modular design
  • Operating temperature: –10 °C to +40 °C (+14 °F to +104 °F)
  • Compact housing as a result of high power density
  • Easy cable connection, mains and motor connections are separated for optimum electromagnetic compatibility
  • Detachable operator panels
  • Screwless control terminals on detachable I/O board
Performance features
MICROMASTER 410 420 430 440

MICROMASTER 410 420 430 440

  • Latest IGBT technology
  • Digital microprocessor control
  • Flux Current Control (FCC) for improved dynamic response and optimized motor control
  • Linear V/f characteristic
  • Quadratic V/f characteristic
  • Multipoint characteristic (programmable V/f characteristic)
  • Flying restart
  • Slip compensation
  • Automatic restart facility following power failure or fault
  • Energy saving mode (stopping e.g. of a pump at low speeds)
  • Motor staging (connection and disconnection of additional motors, use of inverter as control drive in a pump cascade)
  • Manual/automatic mode
  • Load torque monitoring (belt failure detection; detects dry run of pumps)
  • High-grade internal PID controller for simple process control
  • Programmable acceleration/deceleration times, 0 s to 650 s
  • Ramp smoothing
  • Fast Current Limit (FCL) for trip-free operation
  • Fast, repeatable digital input response time
  • Fine adjustment using two high-resolution 10-bit analog inputs
  • Compound braking for rapid controlled braking
  • Four skip frequencies
  • Removable “Y” capacitor for use on IT systems (with non-grounded mains supplies, the “Y” capacitor must be removed, and an output choke installed)
Protection features
  • Overload capability
    • 7.5 kW to 90 kW:
      Overload current 1.4 x rated output current (i.e. 140 % overload capability) for 3 s and 1.1 x rated output current (i.e. 110 % overload capability) for 60 s, cycle time 300 s
    • 110 kW to 250 kW:
      Overload current 1.5 x rated output current (i.e. 150 % overload capability) for 1 s and 1.1 x rated output current (i.e. 110 % overload capability) for 59 s, cycle time 300 s
  • Overvoltage/undervoltage protection
  • Inverter overtemperature protection
  • Special direct connection for PTC or KTY to protect the motor
  • Earth fault protection
  • Short-circuit protection
  • I2t motor thermal protection
  • Locked motor protection
  • Stall prevention
  • Parameter interlock

SIEMENS MICROMASTER 430 Technical data

Technical data


Mains voltage and power ranges

380 V to 480 V 3 AC  ±10 %

7.5 kW to 250 kW (variable torque)

Power frequency

47 Hz to 63 Hz

Output frequency

for inverter 7.5 kW to 90 kW

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

for inverter 110 kW to 250 kW

0 Hz to 267 Hz

Power factor

≥ 0.95

Inverter efficiency

for inverter 7.5 kW to 90 kW

96 % to 97 %

for inverter 110 kW to 250 kW

97 % to 98 %

(Further information is available on the Internet at:

Overload capability

for inverter 7.5 kW to 90 kW

Overload current 1.4 x rated output current (i.e. 140 % overload capability) for 3 s and 1.1 x rated output current (i.e. 110 % overload capability) for 60 s, cycle time 300 s

for inverter 110 kW to 250 kW

Overload current 1.5 x rated output current (i.e. 150 % overload capability) for 1 s and 1.1 x rated output current (i.e. 110 % 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); energy saving mode

Pulse frequency

for inverter 7.5 kW to 90 kW

4 kHz (standard)
2 kHz to 16 kHz (in 2-kHz-steps)

for inverter 110 kW to 250 kW

2 kHz (standard)
2 kHz to 4 kHz (in 2-kHz-steps)

Fixed frequencies

15, programmable

Skip frequency ranges

4, programmable

Setpoint resolution

0.01 Hz digital
0.01 Hz serial
10 bit analog

Digital inputs

6 fully programmable isolated digital inputs; switchable PNP/NPN

Analog inputs

2 programmable analog inputs

  • 0 V to 10 V, 0 mA to 20 mA and –10 V to +10 V (AIN1)
  • 0 V to 10 V and 0 mA to 20 mA (AIN2)
  • both can be used as 7th/8th digital input

Relay outputs

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

Analog outputs

2, programmable (0/4 mA to 20 mA)

Serial interfaces

RS-485, option RS-232

Motor cable length

for inverter 7.5 kW to 90 kW

Without output choke

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

With output choke

See variant dependent options

for inverter 110 kW to 250 kW

Without output choke

max. 200 m (shielded)
max. 300 m (unshielded)

With output choke

See variant dependent options

Electromagnetic compatibility

for inverter 7.5 kW to 90 kW

Inverter with internal filter Class A available

for inverter without filter

7.5 kW to 15 kW

EMC filter Class B to EN 55 011 available as an option

18.5 kW to 90 kW

EMC filter Class B from Schaffner available as an option

110 kW to 250 kW

EMC filter Class A available as an option


DC braking, compound braking

Degree of protection


Operating temperature range

for inverter 7.5 kW to 90 kW

-10 °C to +40 °C (+14 °F to +104 °F)

for inverter 110 kW to 250 kW

0 °C to +40 °C (+32 °F to +104 °F)

Storage temperature

-40 °C to +70 °C (-40 °F to +158 °F)

Relative humidity

95 % (non-condensing)

Installation altitude

for inverter 7.5 kW to 90 kW

up to 1000 m above sea level without derating

for inverter 110 kW to 250 kW

up to 2000 m above sea level without derating

Standard SCCR
(Short Circuit Current Rating) 2)

FSC: 100 kA

Protection features for

undervoltage, overvoltage, overload, earth faults, short-circuits, stall prevention, locked motor protection, motor overtemperature, inverter overtemperature, parameter change protection

Conformity with standards

for inverter 7.5 kW to 90 kW

 UL, cUL, CE, c-tick

for inverter 110 kW to 250 kW

UL available soon, cULavailable soon, CE

CE marking

Conformity with low-voltage directive 73/23/EEC

Cooling-air volumetric flow required, dimensions and weights (without options)

Frame size (FS)

Cooling-air volumetric flow required (l/s)/(CFM)

H x W x D (mm)

Weight, approx. (kg)



245 x 185 x 195



2 x 54.9/2 x 116.3

520 x 275 x 245



2 x 54.9/2 x 116.3

650 x 275 x 245


F without filter


850 x 350 x 320


F with filter


1150 x 350 x 320




1400 x 326 x 356




1533 x 326 x 545


Cubic Feet per Minute

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