The NAM Power Line Form Modules are cabinet-mounted power-on units used in RD500 SFT systems to manage how the main power section is connected to the three-phase mains supply.
They integrate the precharging circuit for the DC-link capacitors of the connected power section and include the main contactor that physically separates the power section from the mains voltage. The modules provide control-signal interfaces to the controller and also provide dedicated supply and check-back signals such as Safe-OFF, “contactor ON,” and “circuit breaker ON” status for coordinated sequencing and monitoring. Certain versions add mains-voltage detection to support synchronization functions for forward and reverse feed operation, and the design includes a “safe power termination” concept that disables contactor/precharge power when a dedicated bridge is removed. Electrically, the series is designed for 3 AC 380–480 V (50/60 Hz) operation with high current capability in the hundreds of amps class, and it is specified for industrial cabinet environments with defined limits for temperature, wiring cross-sections, and installation clearances.
