Product Description:

The NAM4.2-480-0650-NN-120 is a power-line form module from the NAM Power Line Form Modules series manufactured by Bosch Rexroth Indramat. The unit is installed in multi-axis drive cabinets to shape and monitor the DC bus that supplies connected inverter modules for shared power distribution. By coordinating charging, preloading, and fault signaling, it supports stable energy management in industrial automation cells where regenerative drives and large surge currents are common.

This module is energized by a control line rated at 120 VAC and synchronized to a 60 Hz control frequency. Internal logic consumption remains limited to 15 VA, so auxiliary supplies can be sized modestly. A preload circuit delivers 1 A to charge capacitors gradually, while the recommended breaker size is 3.0 A to protect the control wiring. Once active, the power stage can conduct a maximum current of 650 A and buffer energy with a DC-link capacitance of 150 mF. The response relay inside the module is rated for 120 VAC at 1 A on AC loads and 24 VDC at 1 A on DC loads, allowing direct connection to interlock chains without external contactors. It is intended for 3K3 operating conditions, and the open IP00 enclosure means the cabinet must provide the necessary touch-safe barriers and airflow.

Power conductors are connected with a minimum cable section of 2 × 2 × 240 mm², and each terminal must be tightened to 35 Nm to maintain low impedance under high surge conditions. During short disturbances, the unit can withstand a transient pulse of 1000 VA for 150 ms without tripping, helping drive axes ride through line dips. The assembly weighs 20 kg, so the mounting plate must support that static load and keep the module secure during cabinet operation. Cable routing and terminal clamping must also allow enough space for the large conductors used on the power connections.