Product Description:

The TFM 3.1-050-300-W1-220 variable frequency drive is produced by Bosch Rexroth Indramat within the TFM Variable Frequency Drives series. The unit converts fixed-frequency mains power to a controllable output, enabling closed-loop speed regulation of three-phase motors used in conveyors, mixers, and positioning axes. By modulating the inverter bridge, it delivers smooth acceleration, tighter process timing, and lower inrush current while fitting into standard control enclosures. This supports stable motor operation in applications that require adjustable speed across varying load conditions.

In operation, the inverter can supply up to 50 A of phase current, which limits the motor load it can command without triggering current foldback. The internal DC link is maintained at 300 VDC, giving the switching devices enough headroom to form stable output waveforms even at higher frequencies. Thermal management relies on internal air cooling with a built-in blower, so cooling air is drawn through the heat sink channels by the drive itself. The dedicated heatsink blower is energized from a separate supply of 220 VAC, allowing the cooling circuit to stay active during coast-down or when the main power section is disabled. These electrical and cooling limits set the permissible duty cycle and help protect the semiconductors from excessive junction temperature.

A housing width of 42 cm pairs with a depth of 62 cm and a height of 22 cm, so the drive fits standard control cabinets while leaving room for terminal access and airflow clearance. The unit weighs 11.40 kg, which allows straightforward panel mounting without lifting equipment. These dimensions help maintain clearance for heat dissipation and allow mounting alongside other inverters or control modules within typical cabinet load limits.