ALSTOM N897164624A Digital Input Module

Overview

This module connects to the host relay via a dedicated expansion bus or serial interface, allowing seamless integration without additional wiring to the relay's main processor. Each input is fully isolated and can be configured for wet or dry contact sensing. The N897164624A is housed in a compact enclosure suitable for DIN rail mounting or integration into relay cases, making it easy to add I/O points where needed.

Key Features

• Number of Inputs: 8 digital inputs (optically isolated).

• Input Voltage Range: 24-250 VDC / 24-240 VAC (selectable).

• Isolation: 2.5 kV between inputs and logic.

• Input Filter: Programmable debounce time (0-100 ms).

• Wet/Dry Selection: Each input can be used with external voltage or internal wetting voltage.

• LED Indication: Individual status LEDs for each input.

• Communication: Via expansion port to host relay (proprietary).

• Power Supply: Derived from host relay or external 24 VDC.

Technical Specifications

• Input Channels: 8.

• Input Impedance: 10 kΩ (for 110 VDC).

• Thresholds: ON > 80% of nominal, OFF < 30% of nominal.

• Maximum Input Current: 5 mA per channel.

• Response Time: < 5 ms (without filtering).

• Operating Temperature: -25°C to +70°C.

• Dimensions: 45 x 110 x 100 mm.

• Mounting: DIN rail (EN 50022).

• Certifications: CE, UL pending.

Applications

The N897164624A is widely used in substation automation and industrial power management to:

• Monitor circuit breaker and isolator positions.

• Detect external trip indications from other relays.

• Receive interlocking signals from switchgear.

• Capture alarm contacts from transformers or motors.

• Provide additional inputs for programmable logic schemes.

Configuration and Integration

The module is automatically recognized by the host relay when connected. Using the relay's configuration software, each input can be assigned a descriptive name and mapped to internal logic functions (e.g., block autoreclose, start disturbance recorder). The input status is continuously updated and can be viewed locally on the relay display or remotely via SCADA. The N897164624A simplifies the addition of I/O points without replacing the main relay, saving cost and engineering time.

In summary, the ALSTOM N897164624A digital input module is a cost-effective way to expand the monitoring capabilities of protection systems, enabling more comprehensive control and status indication.