NAM1.2-08-03 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat NAM1.2-08-03 is a power line form module from the NAM Power Line Form Modules series. It features a continuous mechanical power rating of 6 kW and a DC bus continuous power of 7.5 kW, with a rated DC bus voltage of 320 V. The module supports 3 input phases and offers a maximum bleeder power of 20 kW, with power terminal size of 10 mm².
Internal Product Review
The NAM1.2-08-03 is a capable power line form module with 6 kW continuous mechanical power and a 320 V rated DC bus. Three-phase input and 22.5 kW DC bus peak power support stable energy handling in demanding drive systems. A strong choice for line-side integration, highlighted by 20 kW maximum bleeder power.
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Product Description:
The NAM1.2-08-03 line-form module is produced by Bosch Rexroth Indramat for the NAM Power Line Form Modules series. Positioned between three-phase mains and Indramat inverter racks, it rectifies incoming AC, builds a shared DC link, and absorbs regenerative energy returned from servo axes. This arrangement keeps drive buses within safe voltage limits and reduces stress on separate braking resistors. In industrial automation, it serves as a centralized power manager for machine tools, packaging systems, and conveyor installations, allowing multiple drives to exchange energy efficiently during rapid acceleration, deceleration, or holding operations.
The module maintains a bus potential of 320 V, which is the reference voltage the downstream inverters expect for stable current control. During constant motion it delivers 6 kW of continuous output, so connected axes can run without voltage sag. Short bursts such as rapid indexing are covered by a surge capability of 22.5 kW on the DC bus, allowing high peak currents without tripping the supply. Excess energy is diverted to an internal bleeder that can dissipate 20 kW, preventing overvoltage when large loads stop abruptly. All cabling lands on 10 mm² power lugs tightened to a torque of 2 Nm; this setting helps maintain low-resistance joints on the three-phase input. Additional figures in steady operation include 0.5 kW of continuous regenerative handling capacity and 90 W of self-dissipation from the electronics.
In extended deceleration cycles the link supports 7.5 kW of continuous bus output while storing up to 30 kWs of returned energy before discharge is triggered. When the controller invokes temporary braking mode, the dedicated resistor path withstands 60 kW, and the auxiliary channel accommodates 1.5 kW of sustained regeneration. Energy acceptance in this operating profile reaches 130 kWs, and separate DC bus terminals keep the bus wiring isolated from the mains leads. That layout helps maintain clear separation between the return-energy path and the incoming supply conductors.
