Frequency converters

Frequency converters (inverters) are used for stepless regulation of the rotational speed of AC motors in a wide speed range. They enable motor control based on advanced control algorithms.

The AC300 series frequency converters are advanced converters dedicated to demanding and heavily loaded applications. They are available in the power range from 0.75kW to 710kW. They can support asynchronous and synchronous induction motors, as well as PMSM motors and electrospindles. There are several control modes to choose from: scalar V/F control, sensorless vector control and vector control with feedback. AC300 inverters provide speed, torque and position control. Side-by-side mounting saves a lot of space in the control cabinet.

Overload capacity up to 200% of rated torque from 0.0Hz with closed-loop vector control. Smooth operation with load from 0.01Hz. AC300 drives provide stable motor torque in torque control mode. The non-linearity is within 3%.

Inverters have a number of useful functions, including static and dynamic motor auto-tuning, dynamic braking, surge suppression, motor noise reduction using a random carrier frequency, energy saving functions, built-in protection functions, e.g. short-circuit protection, overload protection, protection against overvoltage, overheating, stalled motor, etc. The functionality of AC300 drives can be extended using dedicated expansion cards:

• additional I/O input-output card (5xDI, 1xHSDI 50kHz, 1xDO, 3xRO 3A/240VAC, 1x temperature input),
• synchronization card,
• encoder card (support for many types of encoders),
• PLC card (realization of logical functions and function blocks directly from the inverter level),
• CANopen, EtherNet, PROFINET, PROFIBUS-DP, MODBUS, GPRS communication cards.