Description
- Product Model: IS220PDOAH1B
- Manufacturer: GE
- System Platform: Mark VIe
- Power Supply Voltage: 28 V DC nominal (minimum 27.4 V DC recommended), with transient tolerance to ensure stable relay operation during power disturbances.
- Power Consumption: Typically under 10 W, minimizing thermal load in densely populated control racks.
- Operating Temperature Range: -30 °C to +65 °C, extended industrial rating suitable for turbine enclosures or harsh plant conditions.
- Storage Temperature Range: -40 °C to +85 °C, supporting long-term spare storage without degradation.
- Humidity Range: Up to 95% non-condensing, resilient in humid power generation environments.
- Communication Interfaces: Dual RJ-45 10/100 Mbps Ethernet ports, enabling redundant IONet connectivity with deterministic performance for TMR applications.
- Discrete Output Channels: 12 form-C relay contacts, configurable for normally open/closed operation to drive solenoids, alarms, or interlocks.
- Relay Load Rating: Up to 125 V DC or AC loads (specific ratings depend on terminal board; typically supports 15 A inductive/resistive per channel in compatible setups).
- Relay Monitoring Inputs: 15 dedicated feedback inputs for coil and contact status verification, critical for detecting stuck relays or wiring faults.
- Isolation Type: Relay coil isolation and contact separation (typically 1500 V), preventing noise propagation and ensuring safety in high-voltage turbine systems.
- Mounting Type: Plugs onto discrete output terminal boards (e.g., STAO or TRLY series) via DC-37 connector, with vibration-resistant DIN-rail or panel mounting.
- Environmental Protection: Conformal-coated PCB; rated for Class I, Division 2 hazardous locations (Groups A–D), allowing deployment near flammable gases.
- Certifications and Standards: Compliant with IEC 61000 EMC series, IEC 61131-2, hazardous area approvals, and GE Speedtronic qualification for turbine controls.
- Mean Time Between Failures (MTBF): >200,000 hours typical for Mark VIe output packs, supporting extended continuous operation.
- Electromagnetic Compatibility (EMC): Meets industrial standards for immunity and emissions, essential near generators and power electronics.
- Diagnostics: Relay coil monitoring, contact feedback verification, wetting supply checks (if applicable), and Ethernet health reporting via IONet.
Technical Architecture & Functional Positioning
The IS220PDOAH1B operates as a discrete output pack at the field interface layer of the Mark VIe system, directly controlling relay outputs while providing comprehensive feedback for closed-loop verification. It mounts to a terminal board for field connections, receives commands over redundant IONet Ethernet, energizes relay coils, and monitors both coil current and contact state through dedicated inputs. This dual-feedback architecture enables detection of relay failures, welded contacts, or open circuits, feeding status back to the controller for enhanced diagnostics.
Core technologies include electromechanical form-C relays for robust switching, optical or electronic monitoring circuits for each output, shared Mark VIe I/O processor logic for consistent fault handling, and dual Ethernet transceivers supporting TMR voting on output commands—ensuring fault-tolerant actuation in safety-critical applications. The pack’s 15 monitoring inputs (covering coils and contacts) provide granular visibility beyond basic energization status.
These design features solve key turbine engineering problems: preventing undetected output failures in protection sequencing, enabling predictive maintenance through relay health data, and supporting modular replacement with minimal disruption. In TMR configurations, output voting across packs maintains command integrity during single faults, while feedback loops allow the system to confirm execution before proceeding in critical paths like fuel shutoff or trip relays.
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