Description
- Product Model: IS220PDIIH1BD
- Manufacturer: GE
- System Platform: Mark VIe
- Power Supply Voltage: 28 V DC nominal (minimum 27.4 V DC recommended), with wide tolerance to accommodate turbine power fluctuations.
- Power Consumption: Typically under 10 W, ensuring minimal heat dissipation in enclosed control cabinets.
- Operating Temperature Range: -30 °C to +65 °C, extended industrial rating for operation in turbine compartments or harsh plant conditions.
- Storage Temperature Range: -40 °C to +85 °C, allowing safe long-term storage of spares.
- Humidity Range: Up to 95% non-condensing, suitable for humid environments in power generation facilities.
- Communication Interfaces: Dual RJ-45 10/100 Mbps Ethernet ports, providing redundant IONet connectivity with deterministic protocol for TMR applications.
- Discrete Input Channels: 24 contact inputs, supporting dry contacts or powered signals with pack-supplied wetting.
- Contact Wetting Voltage: 32 V DC nominal (internally generated), critical for reliable detection of low-resistance contacts without external supplies.
- Input Isolation: Optical isolation per channel (typically 1500 V), preventing noise propagation and ground loops in electrically noisy turbine settings.
- Input Sensing Levels: Compatible with various terminal boards for 24 V, 125 V, or 250 V DC sensing, offering flexibility in field wiring voltages.
- Mounting Type: Direct connection to discrete terminal boards (e.g., TBCI series) via DC-37 connector, with vibration-resistant DIN-rail or panel mounting.
- Environmental Protection: Conformal-coated PCB; approved for Class I, Division 2 hazardous locations (Groups A–D), enabling use near flammable gases or vapors.
- Certifications and Standards: Compliant with IEC 61000 EMC series, IEC 61131-2 for industrial controls, hazardous area certifications, and GE Speedtronic standards.
- Mean Time Between Failures (MTBF): >200,000 hours typical for Mark VIe discrete packs, supporting high-availability turbine operations.
- Electromagnetic Compatibility (EMC): Meets industrial standards for immunity and emissions, essential near high-power equipment.
- Diagnostics: Channel status monitoring, wetting supply health, and Ethernet link/fault detection, with alarms reported via IONet.
Technical Architecture & Functional Positioning
The IS220PDIIH1BD serves as a distributed discrete input pack in the Mark VIe architecture, positioned at the field layer for direct interface with contact devices. It attaches to a terminal board, supplies wetting voltage to dry contacts, optically isolates inputs, scans states at high frequency, and transmits digitized data over redundant IONet Ethernet to the controller. This edge-based sensing reduces long analog/digital runs, enhancing noise immunity in turbine environments with EMI from generators and igniters.
Key technologies feature per-channel optical couplers for robust isolation, shared Mark VIe I/O processor logic for consistent diagnostics, and dual Ethernet for TMR voting on discrete states—ensuring fault-tolerant permissives in protection logic. The pack’s wetting supply eliminates auxiliary power needs for many contacts, simplifying wiring while maintaining reliable detection.
These elements address common turbine challenges: false trips from contact bounce or interference, high-integrity discrete logic for sequencing/safety, and modular maintainability without system-wide interruption. Continuous self-diagnostics verify wetting integrity, input thresholds, and network status, enabling predictive maintenance and reducing unplanned downtime.
Typical Application Scenarios
- Deployed in gas turbine startup sequencing for monitoring permissive switches, limit switches, and pressure/temperature contacts.
- Used in steam turbine protection systems to interface overspeed, vibration, or bearing condition discrete signals.
- Serves as compatible replacement in Mark VIe turbine fleets, integrating seamlessly with existing IONet and terminal board configurations.
- Supports combined-cycle plant interlocks, detecting breaker status, valve positions, or auxiliary equipment states for coordinated operation.
- Utilized in hazardous-area industrial drives or compressor trains powered by turbines, leveraging Div 2 approval for safe discrete input handling.
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