Product Description:

The 09.F4.S1D-4003 is a frequency inverter produced by KEB within the F4 Combivert Frequency Inverters series. Designed for small-frame induction motors, the unit converts fixed three-phase line frequency into a variable output so conveyor belts, pumps, or positioning stages can be synchronized with process demands. As part of an automation cabinet, the drive links directly to the machine controller through its standard control interface and takes the place of mechanical speed-control hardware while maintaining consistent torque across the operating range. This electronic control approach allows motor speed to be adjusted smoothly as process conditions change during operation.

On the power side, the inverter draws a nominal line current of 4.5 A and delivers an output phase current of 4.1 A. At that rating, the converter supplies up to 2.8 kVA to the connected motor, which corresponds to a motor output of 1.5 kW when the machine is running at full speed. For circuit protection, KEB specifies a maximum mains fuse of 10 A, and incoming leads up to 1.5 mm² can be terminated under the spring clamps. The control board provides a 15 VDC source for field digital inputs that sink up to 100 mA, while a separate 10 VDC potentiometer reference supplies 4 mA for local speed trim.

During deceleration, the built-in integrated braking transistor enables dynamic energy dissipation. The transistor can switch up to the stated braking current when connected to an external resistor network; KEB recommends no less than 160 Ω and lists 390 Ω as the usual element for general duty. Internal switching and conduction losses amount to about 60 W under worst-case thermal loading, so the unit should be mounted on a panel that allows sufficient airflow. With the stated conductor size and fuse limit, the drive can bring the connected motor to a controlled stop without exceeding conductor temperature or tripping upstream protection.