Product Overview

The ABB Bailey NKST11-20 INFI 90 SOE Time Synchronization Cable is a cable assembly used in compatible ABB Bailey INFI 90 installations for Sequence of Events (SOE) time synchronization.

With a specified 20-foot cable length, the NKST11-20 suits installations where the relevant synchronization equipment and SOE hardware are not positioned immediately adjacent to one another. This can be useful in larger control cabinets, equipment rooms, or distributed control-system arrangements where the physical routing distance exceeds shorter cable configurations.

SOE systems are used when the exact order of equipment events matters. During a plant trip, a protection device may operate first, followed by a breaker status change, motor shutdown, alarm activation, or interlock transition. Engineers can use synchronized event records to reconstruct this sequence during troubleshooting and post-event analysis.

The NKST11-20 forms part of the physical timing connection supporting this process.

Time Synchronization Source → NKST11-20 → INFI 90 SOE Hardware → Event Records

The cable does not perform event processing or control logic. Its function is to maintain the required physical connection within the compatible SOE synchronization architecture.

Technical Specifications

Product Features

• ABB Bailey INFI 90 SOE Time Synchronization Cable
• Model NKST11-20
• 20-foot cable length
• Used for SOE time synchronization connections
• Suitable for compatible INFI 90 system hardware
• Supports time-correlated event recording
• Applicable to industrial process-control installations
• Useful for control-system maintenance
• Suitable for replacement of compatible synchronization cabling
• Provides additional routing distance compared with shorter NKST11 configurations

Working Principle

The NKST11-20 carries the synchronization connection required between compatible timing and SOE hardware in an INFI 90 installation.

An SOE system may receive event information from multiple sources. Each source can report a state change independently, while the synchronization infrastructure establishes the common timing reference used to compare those events.

A practical sequence might be:

Equipment Fault → Protection Contact Changes → I/O Detects Event → SOE Records Event → Synchronized Timestamp

Another equipment event may occur shortly afterward:

Breaker Opens → Status Input Changes → SOE Records Event → Synchronized Timestamp

The resulting records can be examined together to establish the chronological relationship between the events.

The NKST11-20 serves the connection between the synchronization hardware and the SOE architecture. It does not itself determine the event sequence or interpret process conditions.

Role in an INFI 90 SOE Architecture

The NKST11-20 sits within the timing and event-recording infrastructure of the INFI 90 system.

Time Reference → NKST11-20 → Synchronization Hardware → SOE Recording → Event Analysis

The physical routing and connection points depend on the specific INFI 90 installation.

Event Sequence Analysis

The main engineering value of synchronized SOE information appears during abnormal events.

A plant disturbance may generate several changes:

If the timing reference is consistent, engineers can compare these events and determine their relative order.

For example, if a motor stopped after a protection signal was recorded, the SOE timeline can help establish that relationship. If the motor status changed before the protection event, the investigation may need to follow a different path.

This makes synchronized event data useful for root-cause investigation, equipment troubleshooting, protection analysis, and control-system maintenance.

Industrial Applications

Installation and Maintenance

The 20-foot cable length should be considered together with the actual equipment layout. Cable routing should avoid unnecessary mechanical stress and should preserve the intended connection between the synchronization hardware and SOE system.

• Confirm the complete NKST11-20 model.
• Verify the required SOE synchronization function.
• Confirm the 20-foot cable length.
• Identify both cable connection points.
• Record the existing routing before removal.
• Inspect connectors for damage.
• Check the cable jacket for cuts, crushing, or deformation.
• Avoid excessive bending during installation.
• Prevent unnecessary tension at the connectors.
• Keep the cable routing orderly within the installation.
• Confirm both ends are correctly connected.
• Check the associated synchronization hardware.
• Verify synchronization status after installation.
• Review newly recorded SOE events.
• Check event timestamps.
• Compare timestamps against known equipment operations.
• Confirm the expected event sequence is being recorded.
• Document the replacement and final routing.

If the SOE system continues to show incorrect timing after cable replacement, check the synchronization source and connected hardware in addition to the cable itself.

Compatible System Components

Recommended Related Models

Key Advantages

• ABB Bailey INFI 90 SOE Time Synchronization Cable.
• Model NKST11-20.
• 20-foot cable configuration.
• Supports SOE timing connections.
• Suitable for time-correlated event recording.
• Useful for trip and disturbance investigation.
• Applicable to INFI 90 maintenance projects.
• Suitable for installations requiring a longer synchronization connection.

Technical FAQs

Why would an INFI 90 installation require the NKST11-20 rather than a shorter cable?

The 20-foot configuration accommodates installations where the physical distance between the relevant synchronization and SOE connection points exceeds the available length of shorter configurations. The actual cable length should be selected from the existing system layout.

Does the NKST11-20 directly connect field sensors to the INFI 90 system?

No. It belongs to the SOE time synchronization path rather than the ordinary field-signal path. Field sensors and contacts normally reach the control system through the appropriate I/O hardware.

How does synchronized timing help during a plant trip?

It allows events from different equipment and I/O points to be compared against a common time reference. Engineers can use the resulting timeline to determine the order of protection actions, equipment trips, alarms, interlocks, and status changes.

What is the first thing to inspect if SOE timing is lost after replacing the cable?

Start with the physical connection and connector seating, then check the associated synchronization hardware and time-reference source. If those conditions are normal, review the system configuration and newly recorded SOE events to isolate the fault.