Description
- Product Model: IS220PSFDH1A
- Manufacturer: GE
- System Platform: Mark VIeS
- Power Supply Voltage: 28 V DC nominal (minimum 27.4 V DC at input), with wide tolerance for transient immunity in safety-critical power buses.
- Power Consumption: Typically under 10 W, supporting low heat dissipation in safety I/O racks.
- Operating Temperature Range: -30 °C to +65 °C, extended industrial range for reliable operation in turbine safety enclosures.
- Storage Temperature Range: -40 °C to +85 °C, permitting long-term spare storage without component stress.
- Humidity Range: Up to 95% non-condensing, suitable for humid power plant environments.
- Communication Interfaces: Dual RJ-45 10/100 Mbps Ethernet ports, providing redundant IONet connectivity with deterministic protocol for TMR voting.
- Discrete Output Channels: 12 form-C force-guided (positively guided) relay contacts, designed for de-energize-to-trip safety functions.
- Relay Contact Rating: Typically 5 A resistive / 2 A inductive at 125 V DC/AC, with arc suppression for inductive loads.
- Contact Monitoring: Dual feedback per relay (coil status + mechanically linked contact status), enabling comprehensive diagnostics and proof testing.
- Isolation Type: Reinforced isolation between channels and logic (typically 2500 V), critical for safety integrity and noise immunity.
- Mounting Type: Plugs onto safety relay terminal boards (e.g., IS200TSAH or TSAI series) via DC-37 connector, with vibration-resistant design.
- Environmental Protection: Conformal-coated PCB; certified for Class I, Division 2 hazardous locations (Groups A–D), supporting use in explosive atmospheres.
- Certifications and Standards: Compliant with IEC 61508 SIL 3 capable, IEC 61000 EMC series, IEC 61131-2, hazardous area approvals, and GE functional safety qualification.
- Mean Time Between Failures (MTBF): High (>300,000 hours typical for Mark VIeS safety packs), supporting extended proof test intervals.
- Electromagnetic Compatibility (EMC): Meets industrial standards for immunity and emissions, essential in safety-critical environments.
- Diagnostics: Continuous coil and contact feedback monitoring, stuck relay detection, short/open circuit detection, and IONet-based safety alarm reporting.
Technical Architecture & Functional Positioning
The IS220PSFDH1A functions as a safety-certified discrete output pack in the Mark VIeS functional safety architecture, dedicated to executing de-energize-to-trip commands in safety instrumented functions (SIFs). It mounts to a safety terminal board, receives voted trip commands over redundant IONet Ethernet, energizes or de-energizes force-guided relays, and continuously monitors both coil state and mechanically linked contact state to verify correct operation. This dual-feedback design enables detection of welded contacts, stuck relays, or wiring faults—critical for maintaining safety integrity level (SIL).
Core technologies include force-guided relays (mechanically linked normally open and normally closed contacts), redundant monitoring circuits per channel, safety-rated processor logic, and dual Ethernet interfaces supporting TMR voting where three PSFD packs must agree on trip action. The pack operates in a de-energized-safe manner for critical outputs, ensuring fail-safe behavior on power loss or detected faults.
These features directly address functional safety requirements in turbine applications: providing diverse, diagnosable trip paths for overspeed, emergency shutdown, or fuel isolation; enabling extended proof test intervals through continuous self-diagnostics; and supporting SIL 3 architectures with high diagnostic coverage. Integration with Mark VIeS allows seamless status reporting to the safety HMI while maintaining independence from the primary control network.
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