Product Description:

The ECNI43-1 power supply module is produced by B & R Automation and belongs to the ECN PLC Power Supplies series. It is intended for installation in MULTI and MIDI controller racks where it furnishes regulated internal voltages needed by CPU, communication, and expansion cards. Supplying these rails from a dedicated module helps maintain signal integrity and allows the PLC to remain operational during varying load conditions encountered on the machine floor.

For the input side, the module accepts a nominal control voltage of 24 VDC, while a permissible range of 18 to 32 VDC allows tolerance for battery backup or droop on long cable runs. Peak inrush and steady-state demand are limited by an internal current draw of 7 A. A reservoir bank rated at 6000 uF stabilizes the input rail against rapid load changes, and an additional single-phase bridge capacitor rated at 6800 uF/35 V supports ride-through during brief brownouts. All primary circuits are galvanically isolated from the secondary side, so field wiring faults cannot propagate into logic ground. The unit does not provide extended self-diagnostics, so status is derived from the rack controller.

On the secondary side, the converter delivers three regulated outputs: +8 V for logic, +15 V for analog circuitry, and -30 V for relay drivers and specialty modules. Combined power across these rails reaches 100 W, permitting simultaneous operation of several high-density I/O cards. Relay contacts on the board are protected by a varistor and tolerate 4000 Vrms breakdown, 250 Vrms transients, and 2000 VA switching loads, reducing the need for external snubbers in most applications. Because the architecture omits the three-phase bridge capacitor, the overall footprint is reduced and cooling requirements remain modest for cabinet temperatures common in factory environments.