The TFM Variable Frequency Drives are Bosch Rexroth Indramat modular drive units built around a 300 VDC DC-bus platform for use in earlier modular AC drive systems.
TFM 3.1 and 4.1 variants were offered in multiple current classes, including 20 A, 30 A, and 50 A versions, to support different machine requirements. The series uses internal air cooling with an integrated blower rather than relying only on passive heat dissipation. The TFM family was designed to operate alongside other Indramat power supply and drive components within a larger modular system architecture. Overall, the line served as a blower-cooled variable frequency drive family intended for integration into established Indramat DC-bus assemblies.
