General Electric IS200TPROH1C Turbine Emergency Protection Terminal Board

GE IS200TPROH1C Mark VI Turbine Emergency Protection Terminal Board — PPRO I/O Pack Interface

The IS200TPROH1C is an Emergency Protection Terminal Board (TPRO) for GE's Mark VI turbine control platform. It serves as the field wiring interface for PPRO (Primary Protection) I/O packs, conditioning speed signal inputs and providing bus/generator voltage monitoring via potential transformers. The board features two pluggable terminal blocks with 48 barrier terminals and three DC-37 pin connectors for backup trip relay terminal board connections.

Key Specifications

• Manufacturer: General Electric / GE Energy
• Series: Mark VI Speedtronic
• Type: Emergency Protection (TPRO) Terminal Board
• Terminal Blocks: 2 blocks, 24 silver metal terminals each (48 total)
• Connectors: 3 DC-37 pin connectors (one on each side of PPRO pack connectors)
• PT Inputs: Pair of potential transformers for bus and generator voltage
• Speed Signal Inputs: Conditioned for PPRO I/O packs
• Operating Temperature: -30°C to +65°C
• Weight: ~0.43 kg (0.95 lbs)
• Mounting: DIN rail or panel mount (sheet metal carrier with plastic insulator)
• Wire Gauge: Typical #18 AWG for speed signals and PT inputs
• PCB Coating: Conformal coating (moisture/salt spray/mildew resistant)
• Status: Active / In production

Architecture & Compatibility

• I/O Pack Pairing: Houses three PPRO I/O packs in TMR systems
• Simplex & TMR: Compatible with both simplex and TMR configurations
• Backup Trip Relay: Each DC-37 accepts a cable to a Mark VI backup trip relay terminal board
• Compatible Variants: TPROH1CD and H12C accept three PPROH1As for direct attachment
• Related Boards: IS200TPROH2C (removable Euro-Block type terminal block variant)
• Mark VIe Compatibility: IS200TPROH1C is used with IS220PPROS1B in Mark VIeS backup turbine protection systems

Installation Guide

1. Mount the TPROH1C and plastic insulator on a DIN-rail-mounted sheet metal carrier or panel-bolted sheet metal assembly.
2. Connect speed signals and PT inputs to the barrier terminal block using #18 AWG wire.
3. Install PPRO I/O packs onto the board connectors.
4. Connect DC-37 cables from each side connector to the backup trip relay terminal boards.
5. 240 VAC Warning: Do not inadvertently cross-connect 240 VAC and DC voltages. The peak voltage exceeds MOV ratings, causing failure. Most AC supplies have grounded neutral — unintended DC/AC connections apply sum of AC peak + 125VDC to MOVs.
6. 120 VAC Note: MOV rating can endure 120 VAC peak voltage without failing.
7. The barrier terminal block can be removed for board replacement without rewiring.

FAQ

Q: Is IS200TPROH1C for Mark VI or Mark VIe?
A: Mark VI. The IS200 prefix indicates Mark VI series. Some sources incorrectly list it as Mark VIe — IS400 series is the Mark VIe RoHS equivalent. However, IS200TPROH1C is also used in Mark VIeS backup protection systems with IS220PPROS1B.

Q: What is the difference between TPROH1C and TPROH2C?
A: TPROH1C has a barrier-type terminal block (removable for board replacement). TPROH2C has a removable Euro-Block type terminal block that plugs in.

Q: What does the H1C suffix mean?
A: "H1" indicates conformal PCB coating and Group one product grouping. "C" is the C-rated functional revision.

Q: How many PPRO packs can it accommodate?
A: Three PPRO I/O packs in TMR systems. Simplex systems use one PPRO pack.

Q: What is the 240 VAC warning about?
A: In 240 VAC applications, never cross-connect AC and DC. The AC peak (339V) plus 125VDC exceeds MOV ratings, causing failure. In 120 VAC applications, the peak (170V) is within MOV tolerance.

Selection Tips

• Mark VI emergency protection, PPRO interface: IS200TPROH1C (barrier terminal block)
• Mark VI emergency protection, Euro-Block: IS200TPROH2C
• Mark VIeS backup protection: IS200TPROH1C + IS220PPROS1B
• Always verify: System generation (Mark VI vs VIe), PPRO pack model, and terminal block type before ordering
• Order compatible PPRO packs: PPROH1A for direct attachment to TPROH1CD/H12C variants