Product Description:

The DMA 004A 1301-D is a servo drive module manufactured by Bosch Rexroth Indramat for the DMA Servo Drive Modules series. It is a three-phase unit intended to run synchronous or asynchronous motors in automated machinery. It supplies regulated current to match commanded speed and torque profiles while interfacing with motion controllers on the plant floor.

This module delivers up to 5.6 Arms at either 4 kHz or 8 kHz switching frequencies, allowing identical peak and continuous currents for applications that need fast torque rise without oversizing the inverter. A non-regulated DC link bus of 715 VDC feeds the output stage, while internal circuitry trims that level to 670 VDC when line conditions permit, keeping motor voltage within insulation limits. The housing measures just 50 mm wide, 288 mm deep, and 504 mm high, so multiple axes can be mounted densely on a common backplane. Despite the compact frame, the unit weighs 7.3 kg, providing enough thermal mass to manage a maximum power loss of 94.3 W under full electrical load. Control electronics draw 1.0 A from an external 24 V supply, keeping logic power separate from the high-energy bus.

Heat is removed by forced air cooling through the backplane, eliminating the need for individual fans on each axis. At higher ambient temperatures, the rated current drops by 0.15 A per kelvin between 45 °C and 55 °C, a derating slope that preserves semiconductor reliability. When the PWM carrier is increased to 8 kHz for quieter motor operation, the continuous output falls to 3.3 Arms, a trade-off between acoustic performance and RMS heating. Command values arrive over the SERCOS setpoint interface, and incremental feedback can be processed through a standard encoder input or a resolver with 12-bit angular resolution, ensuring tight velocity loops on either sensor type.