3A99168G01 8-Channel Relay Digital Output Module_Ningde Androld Automation Equipment Co.,Ltd.

June 05, 2026

3A99168G01 8-Channel Relay Digital Output Module

3A99168G01 is a standard single-slot plug-in relay-type digital output board belonging to Ovation 3A99 series DCS hardware, mainly matched with Ovation controller base backplane, widely used in thermal power & nuclear power unit interlock protection, fan/pump on-off control, solenoid valve drive and alarm signal output loops. The module converts internal controller logic commands into mechanical relay contact switching signals; each independent relay channel provides passive dry contact output to drive field intermediate relays, contactors and site executing devices. It is compatible with whole Ovation standard rack structure, supports hot-swap replacement during system running, and can realize redundant configuration for critical interlock circuits.

Description

PN:3A99168G01｜Emerson (Legacy Westinghouse) Ovation DCS Relay Output I/O Card, dedicated for power plant DEH & auxiliary system interlock control

1. Product Overview

The module converts internal controller logic commands into mechanical relay contact switching signals; each independent relay channel provides passive dry contact output to drive field intermediate relays, contactors and site executing devices. It is compatible with whole Ovation standard rack structure, supports hot-swap replacement during system running, and can realize redundant configuration for critical interlock circuits.

2. Core Electrical Specifications

Backplane power supply: +5VDC, +24VDC supplied by Ovation rack power modules
Channel configuration: total 8 independent isolated relay output channels (SPST dry contact)
Rated contact capacity: Max 250VAC/5A or 30VDC/5A per single channel
Channel isolation: 1000VAC isolation between every channel and internal circuit, anti-cross-interference design
Built-in protection: onboard channel fuse, transient TVS absorption for relay coil surge, overcurrent lockout protection
Signal matching: direct logic communication via Ovation backplane bus with system controller

3. Environmental & Mechanical Parameters

Operating ambient temp inside cabinet: 0℃ ~ +60℃; storage temperature: -40℃ ~ +85℃
PCB conformal coating: full three-layer moisture-proof, anti-mold and anti-salt spray coating for high-humidity power plant cabinet environment
EMC standard: comply with IEC61000-6-2 industrial anti-interference & CE certification
Dimension: standard single-width Ovation Eurocard form factor, unified installation size with 3A99166/3A99165 series boards

4. Front Panel Indicator & Installation Features

Front panel LED status lamps: green POWER LED for module power-on; separate per-channel status LED to show relay pull-in status
Equipped with edge connector terminal for field wiring connection; no extra adapter needed for standard Ovation base wiring baseplate
Hot pluggable design: module can be pulled out and replaced without cutting off rack power, only relevant local field loop temporarily offline; critical protection loops adopt dual-module redundant setup to avoid unit shutdown risk

5. Spare Part & On-site Troubleshooting Guide

Original OEM serial production has been phased out; available stock includes surplus original new parts and fully bench-tested refurbished modules with standard 12-month warranty.

All channels no output: abnormal backplane input power or damaged module main power circuit
Individual channel cannot close contact: blown channel fuse, aging internal relay coil or contact burnout
LED indicator abnormal but contact works normally: damaged onboard channel indicator circuit
Random contact bounce under operation: loose wiring terminals or degraded relay mechanical structure

Contact Info