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Frequency Converter SD2S-FPAM

Highest speeds, lowest motor heating and best control performance – always in real time: The technical basis is the controlled intermediate DC circuit combined with the established pulse-amplitude modulation (PAM) which allows SD2S doing without additional motor chokes even at high speeds.

Based on this technology SIEB & MEYER developed two extremely robust and sensorless control methods: V/f-PAM for asynchronous motors and FPAM for synchronous motors. The usually very special applications in this area require close coordination between the user and SIEB & MEYER. Applications with a large variance of engine types (such as engine test stations) are rather unsuitable.


  • Output Frequencies up to 8,000 Hz

    Established PAM technology with optimized dynamic characteristics, efficiency and flexibility.

    Virtually no speed limitation combined with optimized control dynamics and excellent system efficiency.

    Low initial costs, possibility to access new applications.

  • Sensorless Control of Synchronous and Asynchronous Motors

    The control of synchronous motors (FPAM) is based on the accurate EMF measurement in accordance to the rotor position. For asynchronous motors the well-proven drive function V/f-PWM is used.

    Cost-intensive speed sensors are not required. Flexible switching from synchronous to asynchronous motors is possible.

    Cost savings, easy initial operation.

  • No Need of Motor Chokes or LC-Filters

    The PAM technology allows smallest switching frequencies and reduces the electric stress of the motor as well as interferences (EMC) significantly.

    Additional filter elements or motor chokes are not required.

    Low system costs, easy initial operation.

Device Topology

The Fast One

The existing standard SD2S-FPAM devices are also used as technical basis for customized devices. This way, the customer obtains an optimal solution that is individually adapted to the specific application.


Customized Solutions

The Interfaces of Frequency Converter SD2S-FPAM

  1. USB connection, parameterization, diagnosis and operation
  2. RS232 / CAN interface
  3. 2 analog reference value interfaces: +/-10 V; 
    2 analog outputs: 0 - 10 V
  4. Universal motor encoder interface:
    Hall sensor, linear Hall sensor, magnetoresistive sensor, NAMUR sensor (pulse generator), Sin/Cos encoder
  5. Motor connection
  6. Optional: EtherCAT (CoE)
  7. SERVOLINK 4 via optical fiber PROFIBUS adapter
  8. Power supply
  9. 9 digital inputs and 5 digital outputs
  10. 2 TTL encoder inputs and outputs
  11. Safety Intergrated "STO": Restart lock to meet category 4/PL e according to EN ISO 13849-1:2015 and EN 61508:2010 SIL

PROFIBUS and PROFINET via gateway

Drive Functions and Safety Functions


Software for Initial Operation and Parameterization: drivemaster2

The oscilloscope function allows optimization of the axes in the machine via the drive-setup-tool without additional measuring equipment.

The clear design of the software allows intuitive parameterization via graphics and block diagrams. The „Parameter-Wizard“ guides the user step-by-step through the system configuration and allows intuitive setup of the device via help messages and comments.

Technical Specifications of Frequency Converter SD2S-FPAM

Device type Rated power1 Rated current Peak current/time Max. output voltage1 HxWxD (mm) Weight Cooling
Compact devices - 1 x 110...230  VAC mains voltage
0362X42DC 1.5 kVA 10 Arms 14 Arms/2 s 3 x 200 VAC 280 x 75 x 230 3 kg Air
Compact devices - 1(3) x 110...230  VAC mains voltage
0362X42EC 3.8 kVA 10 Arms 28 Arms/2 s 3 x 200 VAC 253 x 104 x 188 4 kg Air

X = 1: CAN bus
X = 2: EtherCAT and CAN Bus
1) Rated power and max. output voltage for mains voltage/supply voltage (in italic)


  • High-speed spindles are the key components of a machine tool. Only when operated in an optimal way, the desired machining accuracy, productivity and service life of the whole machine is guaranteed. 


  • Grinding applications have a special position in the field of machine tools. Internal grinding applications, for example, require sensorless operation of asynchronous and synchronous spindles up to 250,000 rpm. 


  • PCB drilling is determined by the continuously increasing technical and commercial requirements of the electronics industry. The steadily rising level of integration of the electronic components requires to improve drilling accuracy and process reliability.

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