Product Description:

The TFM 4.1-030-300-W1-115 is a variable frequency drive module manufactured by Bosch Rexroth Indramat and released under the TFM Variable Frequency Drives series. The device converts the facility's fixed-frequency DC bus into a controllable AC waveform so that induction and synchronous motors can follow precise speed references in automated production lines. Integrated into an Indramat modular inverter rack, it delivers torque-controlled motion for conveyors, cartoners, and material-handling cells where stable speed regulation is needed during changing load conditions.

The drive accepts a regulated DC bus of 300 VDC, distributed internally to the power stage through laminated conductors. Control and diagnostic data reach the module through a 12-pin electronics bus connector at interface X1. Separating this header from the power block keeps logic lines away from high-current terminals and simplifies service access. Command lines use a wire ribbon cable that plugs directly into the keyed housing, eliminating individual ferrules. For field wiring convenience, the auxiliary blower connector is mounted on the bottom edge of the front panel, allowing fan leads to clear the high-voltage lugs and keeping the routing path separate from the main power connections.

Because the power section dissipates switching heat continuously, the blower attached at connector X13 must be fed from an external AC source isolated from the internal DC link. This independent supply prevents control brownouts when the fan starts and helps keep the logic section stable during operation. In multi-drive cabinets, communication is daisy-chained along the bus, and a termination resistor is therefore required at the last module to suppress reflections. With proper termination, controllers exchange setpoints and status words across the backplane without data loss, enabling synchronized speed references between adjacent TFM drives and upstream inverter sections.