Product Description:

The DMA 140D 1101-D drive module is built by Bosch Rexroth Indramat for the DMA Servo Drive Modules series. It is a three-phase module for synchronous and asynchronous motors that establishes the DC bus and generates regulated phase currents. Integration is through the RMD/DM backplane, which routes power and communication lines. Designed for machine automation, the unit supports single-axis positioning, so a single cartridge can close the loop on a motor without external amplifiers. This arrangement lets the module serve as both the power stage and control element for an individual axis in compact drive assemblies.

The drive links to a regulated intermediate circuit held at 670 VDC, while the non-regulated bus can rise to 715 VDC. The difference between these bus values allows the module to handle changing load conditions during dynamic motion. At a 4 kHz switching frequency, the overload current ceiling reaches 141 Arms, and at 8 kHz it is limited to 117 Arms. Cabinet heat generation is bounded by 700 W, which helps with thermal planning. A derating factor of 2.25 A per kelvin applies between 45 °C and 55 °C, so current capability must be reduced in warmer enclosures. Air cooling is provided through the backplane channel, and the SERCOS setpoint interface conveys velocity and torque commands while the standard encoder interface closes the feedback loop.

The auxiliary 24 V rail draws 1.58 A, so power-supply sizing must allow for startup surges and fieldbus electronics. Forced ventilation relies on 2 fans mounted behind the module to maintain heat sink temperature. The aluminum housing is 200 mm wide and weighs 19.3 kg. Position feedback is digitized at a single-turn resolution of 20 bits and a multi-turn depth of 32 bits over 4096 revolutions, supporting interpolation at the controller level. That feedback format gives the controller detailed rotor position information for accurate speed regulation and repeatable motion over extended travel.