ECNI43 B & R Automation
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The B & R Automation ECNI43 is a power supply module in the ECN PLC Power Supplies series. It operates with a nominal input voltage of 24 VDC and provides output voltages of +8 V, +15 V, and -30 V. This electrically isolated switching power supply supports a total power output of 100 W and has a current requirement of 7 Amps.
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Product Description:
The ECNI43 is a power supply module produced by B & R Automation within the ECN PLC Power Supplies series. Designed for integration in modular control cabinets, the unit converts a low-voltage DC source into several stabilized rails that feed CPU, I/O, and communication modules in an industrial programmable logic controller. By providing isolated outputs and monitoring circuitry, it helps downstream electronics receive consistent power and allows system status to be reported to the controller’s supervisory logic. It is intended for control platforms that need one module to support both logic electronics and interface circuits from the same incoming supply.
The module operates from a nominal input of 24 VDC and draws up to 7 A when all rails are at full load. A bulk reservoir of 6000 µF is installed on the input side to attenuate line ripple and hold the bus during brief dips. Internally, an electrically isolated switching topology converts the supply into three regulated outputs of +8 V, +15 V, -30 V. Together, these channels can deliver a combined power of 100 W, enabling simultaneous operation of processor cores, analog signal conditioners, and relay drivers. Galvanic isolation between the primary and secondary circuits minimizes ground loops and helps protect the PLC backplane from external faults. Separate output rails let digital control sections and interface hardware receive the voltage levels required by their respective circuits. A ready relay with 4000 Vrms breakdown also provides status feedback and permits remote startup sequencing.
For single-phase installations, the manufacturer specifies an external smoothing bank of 6800 µF / 35 V; in three-phase systems, this component is unnecessary because the rectifier presents a lower ripple factor. Input protection relies on a replaceable slow-blow fuse rated at 10 A, 250 V, limiting fault current while tolerating the inrush associated with the large capacitors. The integrated ready relay can switch up to 2000 VA / 150 W, and overvoltage spikes on its contacts are suppressed by a dedicated varistor. Transient voltage across the coil is limited to 250 Vrms, which helps extend contact life during repeated switching. This design also allows the same module to be used in cabinets with different upstream rectifier arrangements.
Frequently Asked Questions about ECNI43:
Q: What is the nominal input voltage for the ECNI43 power supply?
A: The ECNI43 operates with a nominal input voltage of 24 VDC.
Q: What is the total power output of the ECNI43?
A: This power supply module has a total power output capacity of 100 W.
Q: What output voltages does the ECNI43 provide?
A: The ECNI43 features three output voltages: +8 V, +15 V, and -30 V.
Q: What fuse rating is required for the ECNI43 power supply?
A: A slow-blow fuse with a rating of 10 A at 250 V must be used for protection.
Q: What external capacitor specification is recommended for 1-phase use with the ECNI43?
A: The unit requires an external capacitor of 6800 μF at 35 V when used with a 1-phase input configuration.
