Description

The GE IS200EROCH1ABB(also known as EROCH1)is a 16-channel relay output interface card designed for the General Electric Mark VIe turbine control and protection system—part of the Speedtronic™family used in gas,steam,and aeroderivative turbines worldwide.This module provides isolated,high-reliability switching for critical plant functions such as emergency shutdown(ESD),auxiliary motor control,alarm annunciation,and valve actuation.Each of its 16 Form-C(SPDT)relays is rated for 2 A 30 VDC/250 VAC,driven by 24 VDC coil signals from the Mark VIe controller.With front-panel LED indicators for real-time status monitoring and compliance with IEC 61508 SIL3 when used in safety-configured systems,the IS200EROCH1ABB ensures fail-safe operation in power generation,oil&gas,and industrial energy applications.

Application Scenarios

At a 700 MW combined-cycle power plant in Texas,a failed relay on an older IS200EROCH1ABB module caused intermittent de-energization of the lube oil pump during turbine cooldown—triggering unnecessary trips.The plant’s outage window was only 72 hours,and OEM lead times exceeded two weeks.A pre-qualified spare IS200EROCH1ABB was installed,tested via the ToolboxST diagnostic suite,and verified to switch all 16 channels under load.The relays’Form-C contacts allowed both“run”and“stop”signaling on a single channel,simplifying wiring.Post-replacement,the turbine completed 30 consecutive startups without fault.This case underscores how a small I/O module like the EROCH1 can be mission-critical to plant availability.

Parameter

Main Parameters Value/Description

Model Number GE IS200EROCH1ABB

Alternate Name EROCH1

System Compatibility GE Mark VIe(Speedtronic™)Turbine Control System

Function Relay Output Interface Module

Number of Outputs 16 independent channels

Relay Type Form-C(Single-Pole Double-Throw,SPDT)

Contact Rating 2 A 30 VDC resistive;2 A 250 VAC

Coil Voltage 24 VDC(supplied by Mark VIe backplane)

Isolation Optical+magnetic isolation between logic and field sides

Status Indication Dual LEDs per channel:Green=Energized,Red=Fault/Off

Mounting Plugs into Mark VIe VME-based I/O terminal board(e.g.,TBOD/TBOH chassis)

Operating Temperature 0°C to+60°C(32°F to 140°F)

Certifications CE,cULus,IEC 61508 SIL3(in certified safety applications)

Dimensions Approx.220 mm×160 mm(fits standard Mark VIe I/O rack slot)

Backplane Interface High-density connector to Mark VIe terminal board

🔍Part Number Breakdown:

IS200:GE Mark VIe I/O series

EROC:External Relay Output Card

H1:Hardware revision

ABB:Configuration variant(often denotes standard build;not related to ABB company)

Technical Principles and Innovative Values

Fail-Safe Design:Relays default to de-energized(safe)state on loss of control signal—critical for trip circuits.

Dual LED Feedback:Enables instant visual diagnostics without probing live terminals.

High Contact Life:>100,000 operations at rated load—ideal for frequently switched auxiliaries.

Seamless Mark VIe Integration:Auto-detected by ToolboxST software;no configuration required beyond logic assignment.

Redundancy Ready:Can be used in dual-channel voting architectures for SIL3 applications.

Application Cases and Industry Value

In a LNG compression facility in Qatar,the IS200EROCH1ABB modules controlled emergency vent valves and firewater pumps.During a functional safety audit,inspectors verified that the relays met SIL3 requirements due to their diagnostic coverage and fail-safe behavior.When a gas detector triggered,the EROCH1 simultaneously energized deluge pumps and isolated process sections within 200 ms—well within the safety instrumented function(SIF)response time.The reliability of this module directly contributed to the site achieving zero process safety incidents over five years.For critical infrastructure,the IS200EROCH1ABB is more than an I/O card—it’s a safety enabler.

Related Product Combination Solutions

GE Mark VIe Controller:e.g.,VCMIH1,PROM,IO Packs

Terminal Boards:TBOD,TBOH,or TBSA for field wiring

ToolboxST Software:For configuration,diagnostics,and firmware management

IS200EPSMG1A:24 VDC power supply module for I/O chassis

IS200AVIBH1B:Vibration input card(complementary sensing)

IS200SSMPSG1A:Redundant power supply for critical racks

GE Trip Solenoid Valves:e.g.,20/30TV,driven by EROCH1 outputs

Phoenix Contact REL-MR Series:Alternative relays for non-GE systems

Installation,Maintenance,and Full-Cycle Support

Installation Guidelines:

Power down the Mark VIe I/O chassis.

Insert IS200EROCH1ABB into designated slot on terminal board(e.g.,TBOH).

Connect field wiring to screw terminals on front—observe polarity for DC loads.

Power up and verify channel status via ToolboxST or front-panel LEDs.

Maintenance Best Practices:

Perform annual contact resistance tests using a milliohm meter.

Inspect for pitting or arcing on relay contacts during outages.

Keep firmware on associated VCMI controllers synchronized.

We supply new surplus,refurbished,and tested GE IS200EROCH1ABB modules,each verified for:

✅All 16 relays(energize/de-energize under load)

✅LED indicator functionality

✅Connector pin integrity and backplane communication

✅Compliance with GE’s electrical specifications

Every unit includes a test certificate and carries a 12-month warranty.We also provide:

Cross-reference for obsolete Mark V equivalents

Emergency 24/7 technical support for turbine outages

Bulk pricing for fleet-wide spares programs

Contact us for a trusted GE IS200EROCH1ABB—a cornerstone of reliable,safe,and compliant turbine control in the world’s most demanding power and industrial facilities.

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