SIEMENS MICROMASTER 430 – Drive Technologies


The MICROMASTER 430s are a range of 3AC-frequency inverters for controlling the speed of three phase AC motors. The various models available range from the 7,5 kW input to the 90 kW input.
The MICROMASTER 430 is especially well suited for use with pumps and ventilators when used with its factory set functions and settings.
The inverters are microprocessor-controlled and use state-of-the-art Insulated Gate BipoIar Transistor (IGBT) technology. This makes them reliable and versatile. A special pulse-width modulation method with selectable Pulse frequency permits quiet motor operation. Comprehensive protective functions provide excellent inverter and motor protection.

Siemens MICROMASTER 430 is the ideal AC drive for pump and fan applications. The integrated PID and pump synchronization functionality make this a cost-effective solution for flow control applications. With advanced features like energy savings mode and customizable v/hz control mode that can be programmed to match pump and fan curves, the MICROMASTER 430 will improve your productivity while saving costs.

Standard Features

  • Customized Operator panel for flow control applicationsMICROMASTER 430 Standard Drives
  • PID process controller
  • Integrated RS 485 communications
  • Optional communication modules include PROFIBUS, CanOpen, DeviceNet™ communication
  • Energy Savings Mode
  • Bypass Mode
  • Belt Break / Pump Dry Detection
  • Configurable I/O
  • Internal Logic Functionality
  • Configuration and programming via keypad, STARTER, or DriveMonitor software


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)

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Technical specifications

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

1) For further information see

2) Applies to industrial control cabinet installations to NEC article 409/UL 508A.