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SD4B: Compact Space Marvel with Many Interfaces

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Frequency converter SD4B

Recently added to the SIEB & MEYER product range: the exceptionally compact SD4B, successor of SD2B plus. The device is designed as high-dynamic servo amplifier for the operation of rotary and linear low-voltage servo motors but it is also suited to the optimized operation of high-speed low-voltage synchronous and asynchronous motors.


Beside sensorless operation of synchronous motors up to 240,000 rpm and asynchronous motors up to 360,000 rpm, the frequency converter SD4B allows a sensor-based operation of motors operating in the high-speed range with superimposed synchronization function using 24 V synchronization signals. Therefore, the device can operate several high-speed motors with angular synchronism via master/slave connection, which is useful, for example, in the field of optical system applications. The robust speed control can also cope with high mass inertia ratios of up to 1:100 between motor and tool.

In addition to its flexibility, SD4B stands out for its compact design with IP20 housing: thanks to the small width of 25 mm the device requires only little installation space. It is equipped with the safety function STO (Safe Torque Off) and provides the communication protocols CANopen and Modbus TCP by standard. An EtherCAT interface is optionally available; PROFINET and POWERLINK are in preparation. In addition to the TTL encoder inputs and outputs, the device comes with five digital inputs/outputs each as well as an Ethernet interface for easy parameterization.

With the NRTL/CSA certification, which is currently being applied for, users can soon integrate the devices into systems for the US market without additional approvals.