IS200TRTDH1DBB | GE Mark VI Speedtronic RTD Input Terminal Board
The IS200TRTDH1DBB is an RTD input terminal board built by General Electric for the Mark VI Speedtronic turbine control system. It accepts 16 three-wire RTD inputs through two barrier-type terminal blocks. Each input carries noise suppression circuitry for surge and high-frequency rejection. The board is a simplex unit with two DC-type connectors. It cables to a PRTD I/O pack through two 37-pin female connectors, JA1 and JB1. The I/O processor converts the inputs to digital temperature values and sends them to the controller. This board suits steam and gas turbine packages that need reliable temperature scanning.
Board Architecture
- Simplex design, one of four TRTD board versions.
- Two DC-type connectors on the board edge.
- Two removable terminal strips for maintenance.
- 24 screw terminals per strip, 8 inputs per strip.
- Terminals accept wire up to #12 AWG.
- Two female 37-pin connectors, JA1 and JB1.
- No jumpers and no configurable hardware.
- Notched edge and oval cutouts for screw mounting.
Signal Path and Scanning
- Excitation current: 10 mA DC, multiplexed, not continuous.
- Max two-way cable resistance: 15 ohms.
- RTD distance from cabinet: up to 300 m (984 ft).
- Normal scan: 4 samples per second.
- Fast scan: 25 samples per second.
- Sample interval tracks power system frequency.
- Software linearization covers 15 RTD types.
- Redundant pacemakers coordinate multiplexing.
Technical Data
- Part number: IS200TRTDH1DBB
- Brand: General Electric
- Series: Mark VI Speedtronic
- Product type: RTD input terminal board
- Channels: 8 per terminal board, 16 with two PRTD packs
- RTD types: 10, 100, 200 ohm platinum; 10 ohm copper; 120 ohm nickel
- Span: 0.3532 to 4.054 V
- Lead resistance: 15 ohms max, two-way
- Fault detection: failed ID chip, open and short RTD
- Country of origin: United States
Limit Checking and Fault Handling
- Hardware high and low limit checks run on each channel.
- Software system limit checks add a second layer.
- Out-of-range values flag open and short circuits.
- A faulty channel drops out of the scan.
- Repaired channels return in 20 seconds, auto or manual.
- Failed ID chip detection supports diagnostics.
Wiring Notes for Installation
- Use double-shielded wire for all RTD runs.
- Terminate every shield at the shield strip.
- End shields sit at the end device.
- Tie the shield strip to chassis ground.
- Each block is held by two screws.
- Check polarity before you power the rack.
Which Systems Does It Fit?
- GE Mark VI Speedtronic turbine control cabinets
- Mark VIe simplex applications with PRTD I/O packs
- Steam turbine temperature monitoring loops
- Gas turbine exhaust and bearing RTD circuits
- Legacy turbine packages kept in service
FAQ
Q: How many RTD inputs does one IS200TRTDH1DBB handle?
A: The board has two terminal strips with 24 screw terminals each. That gives 8 three-wire inputs per strip. Two PRTD packs bring the total to 16 inputs.
Q: Can this board run in a TMR Mark VI rack?
A: The H1D version is simplex. For TMR redundancy, the TRTDH1B version fans inputs to three VRTD boards in the R, S and T racks. Match the board to your rack type.
Q: My temperature readings drift on long RTD runs. What should I check?
A: Measure the two-way cable resistance first. Keep it under 15 ohms. Confirm every shield lands on the shield strip. Keep RTD pairs away from power cables.
Q: What wire should I use for the RTD field runs?
A: Use double-shielded wire up to #12 AWG. Terminate shields at the strip and at the end device. This keeps noise out of the 10 mA excitation loop.
Q: How do I pick between TRTDH1D and other TRTD versions?
A: Start with the rack type and pack count. Simplex racks take the H1D. TMR racks need the redundant version. Send us the rack layout and we will confirm the right part.
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