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Product Overview
The GE IS220PTCCH1A is a thermocouple input module for the GE Mark VIe turbine control system. It provides the interface between thermocouple field signals and the Mark VIe distributed control architecture, allowing temperature measurements to be acquired, processed, and transmitted through the I/O Ethernet network. The module supports standard E, J, K, S, and T thermocouples, as well as low-level mV inputs from -8 to 45 mV. A single pack can handle up to 12 thermocouple inputs, while system architecture can use multiple packs for simplex or TMR configurations. GE documentation also identifies compatible terminal boards including STTCH and TBTCH variants.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | IS220PTCCH1A |
| Manufacturer | GE / General Electric |
| Product Type | Mark VIe Thermocouple Input Module / I/O Pack |
| Power | 28 V DC nominal; maximum current 0.16 A DC |
| Communication / Protocol | Mark VIe I/O Ethernet network |
| Thermocouple Inputs | Up to 12 per pack |
| Supported Thermocouples | E, J, K, S, T |
| mV Input Range | -8 to 45 mV DC |
| Operating Temperature | -30°C to +65°C |
| Mounting | Direct mounting to compatible Mark VIe terminal board |
| Dimensions (HxWxD) | Verify against applicable GEH-6721 revision |
| Weight | Approx. 1 lb / 0.45 kg unit reference |
| Typical Interfaces | Dual Ethernet ports, 3-pin power input, DC-37 terminal-board connection |
| Compliance | Mark VIe system; hazardous-location configurations subject to approved terminal-board combinations |
The GE Mark VIe documentation specifies 27.4 to 28.6 V DC as the supported supply range for this PTCC family.
GE IS220PTCCH1A
Key Features and Benefits
- Supports 12 thermocouple inputs in a single-pack configuration.
- Accepts E, J, K, S, and T thermocouple types for turbine temperature monitoring.
- Provides low-level mV measurement capability for compatible applications.
- Supports simplex, dual-pack, and TMR system configurations depending on terminal-board architecture.
- Includes local processing and acquisition electronics for distributed I/O operation.
- Provides built-in diagnostics for processor hardware, memory, Ethernet ports, and internal power supplies.
Personally, I would verify the terminal-board part number before replacing this module. The PTCC pack is not universally interchangeable with every Mark VIe temperature-input board, and the exact hardware combination matters during field replacement.
Related Models
IS220PTCCH1B — Later PTCC variant using a compatible BPPC processor board and supported by newer ControlST software versions.
IS220PTCCH2A — Expanded PTCC variant supporting additional thermocouple types, including B, N, and R.
IS200TBTCH1B — Compatible TBTC terminal-board family used with PTCC packs in appropriate system configurations.
IS200STTCH1A — Simplex thermocouple terminal board compatible with the PTCC input pack.
GE IS220PTCCH1A
Installation and Maintenance
Confirm the installed terminal board, system architecture, firmware/software compatibility, and thermocouple type before replacement. Field wiring should be inspected for polarity, shielding, grounding, and excessive cable resistance. GE documentation specifies a maximum cable resistance of 450 Ω for supported thermocouple applications.
During maintenance, also check the Ethernet connectors, power connection, terminal-board interface, status LEDs, and diagnostic records. Follow the site’s approved turbine-control shutdown and isolation procedures before removing the I/O pack.
Product Warranty
Warranty terms depend on supplier, stock condition, and purchase agreement. Before procurement, confirm the exact revision, condition, test status, country of origin, and applicable warranty period. For legacy Mark VIe systems, matching the complete hardware reference is recommended rather than selecting a replacement solely by functional description.
The GE IS220PTCCH1A remains a useful spare for Mark VIe temperature-input applications where thermocouple signal acquisition and turbine-control system compatibility are critical.
