Description
This discrete hardware component interfaces field-mounted RTD sensors directly with the Mark VIe control system’s I/O processor modules, such as the PRTD or JREG card.
Commercial and Supply Chain Status
- Condition: New Original (Factory Sealed) or Refurbished (Fully Functional/Tested)
- Warranty: 12-Month Industrial Warranty
- Availability: In Stock / Critical Legacy Part Availability
- Lead Time: Ships within 1 to 2 business days from order verification
- Pricing: Price subject to market conditions and current turbine control component availability; contact us for a firm quote.
Technical Specifications
| Parameter | Value |
| Product Line | Mark VIe Control System |
| Board Model Number | IS200TRTDH1CCC |
| Input Channels | 16 independent RTD channels |
| Supported RTD Types | Pt100 (Platinum, 100\ \Omega), Cu10 (Copper, 10\ \Omega), Ni120 (Nickel, 120\ \Omega) |
| Wiring Configuration | 3-wire installation per channel (Supports lead-wire resistance compensation) |
| Common Mode Rejection | Minimum 120 dB at 50/60 Hz |
| Excitation Current | Constant current source per channel (Typically 1 mA to 2.5 mA; verify with processor spec) |
| A/D Conversion Resolution | Dependent on matching I/O module (Typically 14 to 16-bit resolution) |
| Terminal Design | High-density barrier terminal blocks |
| Conformal Coating | Class H1CCC revision features chemical/gas ingress-resistant coating |
Functional Architecture and Terminal Layout
The IS200TRTDH1CCC acts as a passive termination network designed to organize and suppress noise on delicate low-voltage analog temperature signals before they hit the active analog-to-digital converter (ADC) multiplexers on the companion I/O board.
3-Wire Compensation Circuitry
To prevent the electrical resistance of long field cable runs from altering temperature calculation accuracy, the board utilizes a standard 3-wire topology. Two leads carry the excitation current down to the RTD element, while a third sense lead computes the physical voltage drop across the copper run. The board matches this feedback line directly with the system’s differential instrumentation amplifiers to subtract the lead-wire offset dynamically.
Hardware Revisions and Coating Suffixes
The H1CCC suffix indicates a specific revision layout with enhanced environmental protection:
- H1 Designation: Standard single-board footprint configuration with specific connector headers for redundant or simplex I/O packs.
- CCC Variation: Represents a factory-applied conformal coating layers patch. This provides critical moisture, dust, and corrosive gas insulation, allowing the board to operate reliably inside turbine-generator package enclosures exposed to industrial atmospheres.
Engineering Insights: Installation and Lifecycle Maintenance
Noise Mitigation and Shield Grounding
Because RTD sensors operate on low millivolt signals, they are highly susceptible to electromagnetic interference (EMI) from adjacent medium-voltage turbine machinery.
- Ensure all field cables feature a twisted, shielded configuration.
- Drain or terminate the cable shields exclusively at the designated ground bar adjacent to the TRTD terminal board. Never ground the shield at both the sensor body and the terminal enclosure, as this creates a ground loop capable of inducing multi-degree temperature skew.
I/O Pack Hot-Swapping Security
While the Mark VIe architecture allows for hot-swapping active I/O processor packs (such as the PRTD module) mounted directly onto the TRTD connectors, the terminal board wiring itself should not be disturbed while the system is under load.
- Loose terminal screws or intermittent opens on a live 3-wire loop can trigger instant “Bad Sensor” diagnostics, driving the logic into a high-temperature trip fault state and initiating an emergency turbine shutdown.
Frequently Asked Questions
Q: Can the IS200TRTDH1CCC be used to terminate Thermocouple (TC) sensors? A: No. Thermocouple signals rely on the Seebeck voltage effect and require cold-junction compensation (CJC) thermistors, which are handled by dedicated boards such as the TBTCH1B or TTUR series. The TRTD board is strictly engineered to pass variable resistance profiles and provide excitation currents to RTD networks.
Q: What causes an unexpected “Hardware Configuration Mismatch” alarm after installing this replacement board? A: This indicates that the revision suffix configured within your GE ToolboxST project layout does not match the physical board version. Ensure the exact firmware settings and hardware sub-code definitions are updated to reflect the H1CCC variant in the software layer before re-downloading the configuration.
Q: How can I verify if an input channel on this board has failed versus a bad field sensor? A: Disconnect the 3 field wires from the target channel terminals on the TRTD board and place a precision 100.0\ \Omega calibration resistor across the excitation and sense inputs. If the HMI dashboard updates to show a stable 0^\circC (32^\circF) reading (for a standard Pt100 curve), the termination board and I/O pack are processing correctly, isolating the fault to the field wire path or the sensor probe.
