Frequency Converter SD4M

Standard converters in the higher power classes typically use the well-known technology of two-level pulse width modulation (PWM) with max. 8 kHz switching frequency. In most high-speed applications, this requires additional components such as LC filters or chokes to minimize the additional losses in the engine. SIEB & MEYER frequency converters of series SD4M are specially designed for high-speed applications and use the innovative three-level technology – also called multi-level technology.

The SD4M devices follow the successful SD2M series and are designed for stationary use in control cabinets of turbo compressors as well as for applications such as ORC, gas expansion and flywheel.

The Top Booster

The three-level technology is of great advantage in these applications because in most cases the SD4M converters do not require motor filter elements. This additional value is achieved by the three-level technology, as well as the PWM switching frequency of up to 16 kHz as standard and optionally up to 32 kHz for dedicated versions. The combination leads to a considerably improved motor current quality, which significantly reduces the undesired rotor losses – by up to 90 %!

Technology/ System-Property	SD4M Three-level PWM	Standard converter Two-level PWM with motor choke	Standard converter Two-level PWM with LC filter
Low weight				✓	X	X
Small installation space				✓	X	X
No risk of resonance effects				✓	✓	X
Total costs	✓	X	X

Highlights

Three-Level Technology

Function:
The output stages of SD4M Turbo are based on a three-level technology and provide rotating field frequencies up to 2,000 Hz with switching frequencies of 16 kHz.

Advantage:
Reduced motor losses combined with minimum efforts for motor filters and motor chokes as well as low interfering radiation and insulation stress.

Benefit:
Low system costs over the whole product life cycle.
Efficiency

Function:
The devices reach efficiencies of up to 98 %.

Advantage:
The high efficiency of the devices ensures optimal system efficiencies and reduces cooling requirements.

Benefit:
Maximum system output and lower environmental footprint due to lower energy consumption.
DC Supply

Function:
Active emergency braking and maintenance of voltage supply in case of power supply failure.

Advantage:
No separate voltage supply for the magnetic bearings needed.

Benefit:
Protection of the magnetic bearings in case of power failure as well as cost savings.

Our Experience in High-speed Technology - Your Advantage!

Up to 60 % reduced installation space for the required electrical components

Improved availability due to the reduced number of components

Up to 50 % reduced weight for the required electrical component

Reduced environmental footprint due to lower energy consumption

Significantly less wiring- and assembly work

Connectivity for the future Ethernet/web server/EtherCAT/Modbus

Cost reduction for IPM the drive chain

Maximum performance of IPM motors through dynamic operating point control

Improved efficiency of the overall system

Motor Currents by Comparison

Good to Know

Currently available power classes from 100 to 500 kVA, with up to 800 Aeff rated current.
Liquid cooling as standard (water-based), air cooling on request
NRTL/CSA certified
Very low insulation stress on the motor winding - even with long motor cables - due to 50 % smaller PWM switching amplitudes (see graphic below)
Optional DC power supply for active magnetic bearings, via internally fused DC link terminals
Designed for 100 % utilisation 24/7
All power components designed for 10 years continuous operation at rated load
Designed for worldwide 3-phase supply networks - also potential-free IT
Powerful parameterisation and diagnostic software drivemaster4
Customer-specific solutions can be realised
3C3 protective coating of the printed circuit boards for operational safety in aggressive environments

The Interfaces of Frequency Converter SD4M

Mains voltage
Logic board
Motor connection
Liquid cooling

Drive Functions and Safety Functions

SVC

V/f PWM

Servo

STO

Simulation, commissioning, monitoring: drivemaster4

Simulation

Electrical operating points
Influence of PWM frequency/inverter topology
FFT analysis including THDi/THDu calculation
Export of simulation data

Commissioning

Parameterisation of the motor data/interfaces
Optimisation by means of oscilloscope
Commissioning tool

Monitoring

Data logger
Real-time clock
Error memory
Operating hours counter

Technical Specifications of Frequency Converter SD4M
with 3-phase AC Mains Voltage without Brake Chopper

Device type	Nominal power¹	Nominal current	Max. Output voltage¹	HxBxT (mm)	Weight	Cooling
Compact units - 3 x 200...480 VAC mains voltage
SD4M	120 kVA	165 A_rms	3 x 410 VAC	685 x 388 x 188	30 kg	Water^{2) 4)}
	180 kVA	255 A_rms	3 x 410 VAC	771 x 439 x 207	43 kg	Water ^{2) 4)}
	228 kVA	310 A_rms	3 x 410 VAC	771 x 439 x 207	43 kg	Water^{2) 4)}
	342 kVA	480 A_rms	3 x 410 VAC	1317 x 326 x 489	94 kg	Water ^{2) 3)}
	438 kVA	630 A_rms	3 x 410 VAC	1317 x 326 x 489	94 kg	Water ^{2) 3)}
	500 kVA	800 A_rms	3 x 410 VAC	1478 x 353 x 596	136 kg	Water ^{2) 3)}

1) Rated power and max. output voltage with mains voltage/supply voltage printed in italics.
2) Cooling tubes aluminium
3) Copper cooling tubes
4) Air-cooled variants and variants with other cooling tube materials on request.

Applications

In the field of turbomachines, the system's efficiency can be continuously improved by increasing the system speed or omitting the gear.

Compressed Air Production
Due to their design, a large number of technologies in the field of waste energy usage or mechanical energy storage require high-speed motors and generators

Wastewater Treatment
Rotary atomization processes, e.g. applied for the production of milk powder or flue gas treatment, require high circumferential speeds. Therefore, it is necessary to use matching high-speed motors instead of low-speed standard motors.

Atomizer
Refrigeration units with turbo or centrifugal compressors with higher power ranges operate with high speeds. Frequency converters by SIEB & MEYER easily provide the required speeds and their control method ensures an exceptionally low rotor heating.

Refrigeration and Air Conditioning

News

09/11/2023 Frequency Converter SD4M

SIEB & MEYER Presents SD4x Frequency Converters at the trade show SPS 2023

SIEB & MEYER has further expanded its SD4x product family. From November 14 to 16, 2023, visitors of the SPS trade show in Nuremberg have a chance to…

05/22/2023 Frequency Converter SD4M

Optimal Consulting, Competent Support

A close relationship to the customer is part of the corporate philosophy of SIEB & MEYER based in Lueneburg, Germany. Therefore, the specialist for…

03/10/2023 Frequency Converter SD4M

Optimal Operation of IPM Motors

The central advantages of the SD4x product family by SIEB & MEYER are optimized performance, higher speeds and low motor heating without additional…

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