The IS200TRPGH1BCC is a high-reliability Gas Turbine Primary Trip (TRPG) terminal board from GE, designed for use in Mark VI and Mark VIe turbine control systems. Fully designated as IS200TRPGH1BCC, this board provides critical primary protection functions by interfacing the Primary Turbine Protection controller (VTUR or PTUR) with up to three trip solenoids (ETDs) and eight Geiger-Mueller flame detectors. The IS200TRPGH1BCC is a TMR (Triple Modular Redundant) version that incorporates nine magnetic relays arranged in three two-out-of-three voting circuits—one per trip solenoid—ensuring fail-safe turbine overspeed and emergency trip protection.
The IS200TRPGH1BCC works in conjunction with the TREG board (Emergency Trip) to form complete primary and emergency interfaces to the trip solenoids. It is suitable for gas turbine applications requiring high availability and fault tolerance. This product introduction provides a complete, SEO-optimized specification for the IS200TRPGH1BCC. All references use the full product designation IS200TRPGH1BCC to meet Google’s content uniqueness and keyword relevance standards.
Key Features of IS200TRPGH1BCC
TMR Voting Architecture: Three relays per trip solenoid with hardware two-out-of-three voting logic
Trip Solenoid Interface: Controls up to three 125 V dc or 24 V dc trip solenoids (ETDs)
Flame Detector Inputs: Eight channels for Geiger-Mueller flame detectors (335 V dc excitation)
Diagnostic Feedback: Normally closed relay contacts monitored for coil/contact status; supply voltage monitoring
ID Device: Read-only chip on connectors JR1, JS1, JT1 for board identification, serial number, and revision check
No Field Jumpers: No user-configurable jumpers or switches – plug-and-play operation
Dual I/O Terminal Blocks: Removable terminal blocks for easy wiring and maintenance
MOV and Current Limiting: Built-in protection per ETD circuit
Compatibility: Works with VTUR (Mark VI) and PTUR on TURHIC (Mark VIe) controllers
Functional Description of IS200TRPGH1BCC
The IS200TRPGH1BCC is a terminal board that provides the primary turbine trip function. It is controlled by the Primary Turbine Protection controller (VTUR in Mark VI systems or PTUR in Mark VIe systems). The board contains nine magnetic relays arranged in three separate voting circuits—one circuit per trip solenoid (ETD). For TMR applications (which the IS200TRPGH1BCC supports), each trip solenoid is driven by three relays whose contacts are wired in a hardware two-out-of-three voting configuration (relay ladder logic). This ensures that even if one relay or its control path fails, the solenoid can still be properly energized or de-energized based on the majority vote.
The I/O pack/board (VTUR or PTUR) controls the relays on the IS200TRPGH1BCC by energizing or de-energizing their coils. The controller also monitors the current flow in each relay driver line to determine the relay’s state and the status of the relay coil contacts. A normally closed (NC) contact from each relay is fed back to the diagnostics to verify proper operation. Supply voltages (125 V dc solenoid bus, 28 V dc relay coil supply, and 335 V dc flame detector excitation) are also monitored. If any signal exceeds acceptable limits, a diagnostic alarm is generated.
The primary overspeed trip command originates in the controller, passes through the I/O pack, and then to the IS200TRPGH1BCC, which activates the appropriate relays to trip the solenoids. The IS200TRPGHH1BCC works in tandem with the TREG board (emergency trip) to fully drive the three ETDs.
Flame Detection
For gas turbine applications, the IS200TRPGH1BCC accommodates inputs from up to eight Geiger-Mueller flame detectors. These detectors are powered by 335 V dc (supplied via connectors J3, J4, J5). When no flame is present, the detector charges up to the supply voltage. When a flame is present, the detector repeatedly charges and discharges through the IS200TRPGH1BCC. As flame intensity increases, the discharge frequency increases. Each discharge produces a voltage pulse that is fanned out to all three control modules (in TMR). Pulses above 2.5 V generate a logic high, and the pulse rate is counted over a 40 ms period. The rate varies from 0 to 1000 pulses per second, providing a measure of flame intensity.
Version Differences and IS200TRPGH1BCC Characteristics
The IS200TRPGH1BCC corresponds to the TRPGH1B version in GE documentation, with “CC” indicating a specific factory configuration or revision (consult factory for exact details). Key characteristics of the H1B type (and thus the IS200TRPGH1BCC) are:
Feature | IS200TRPGH1BCC (H1B type) |
TMR Support | Yes |
Simplex Support | No |
Output Contact (125 V dc, 1 A) | Yes |
Output Contact (24 V dc, 3 A) | Yes |
28 V Power Use | Normal |
Special Handling of 28 V Control Power | No (H1B uses normal; H3B uses special) |
Note: The H1A and H2A versions are not used for new applications. The IS200TRPGH1BCC is the recommended TMR version for new installations requiring primary turbine trip and flame detection.
Installation and Wiring for IS200TRPGH1BCC
The IS200TRPGH1BCC features two removable I/O terminal blocks for simplified wiring and maintenance:
Power and signal connections:
J1 plug – 125 V dc power for trip solenoids.
J2 plug – Transfers power to the TREG emergency trip board.
J3, J4, J5 plugs – Supply 335 V dc power for flame detectors (connect to detector power inputs).
JR1, JS1, JT1 connectors – Provide 28 V dc supply for relay coils and contain ID devices for board identification.
Wiring guidelines:
Up to two #12 AWG wires per terminal point.
Wire insulation rating: 300 V minimum.
Use shielded cables for flame detector signals to avoid noise.
The IS200TRPGH1BCC is typically mounted in the turbine control cabinet and connected via molded-plug cables to the VME rack (Mark VI) or directly to TURHIC (Mark VIe). No configuration jumpers or switches are present on the board; it operates as a passive terminal board under controller command.
Diagnostics and Fault Monitoring
The IS200TRPGH1BCC provides extensive diagnostic feedback to the I/O pack/controller, including:
Relay driver current monitoring – verifies coil energization.
Normally closed relay contact status – checks if relay mechanically operates.
Solenoid power bus voltage – ensures 125 V dc supply is within limits.
Flame detector excitation voltage – monitors 335 V dc for under/over voltage conditions.
ID device interrogation – each plug connector (JR1, JS1, JT1) contains a read-only chip with:
If a mismatch is detected between the expected and actual ID device, a hardware incompatibility fault is generated. Any unhealthy diagnostic signal (beyond limits) triggers a diagnostic alarm, allowing operators to identify and replace faulty components before a critical trip event.
Replacement and Ordering Information for IS200TRPGH1BCC
When replacing a IS200TRPGH1BCC, observe the following:
De-energize the turbine control system and follow lock-out/tag-out procedures.
Identify the correct board version (TMR, H1B type) – IS200TRPGH1BCC is a direct replacement for TRPGH1B in TMR applications.
Remove wiring from terminal blocks (blocks are removable for convenience).
Unplug connectors J1–J5 and JR1–JT1.
Mount the new IS200TRPGH1BCC and reconnect all wiring.
After power-up, verify that the controller recognizes the ID devices and that diagnostic alarms are clear.
To order the IS200TRPGH1BCC, provide:
Full part number: IS200TRPGH1BCC
Turbine controller model (Mark VI or Mark VIe)
System serial number (if available)
Contact GE or an authorized distributor for pricing and availability.
Why Choose IS200TRPGH1BCC for Your Gas Turbine?
The IS200TRPGH1BCC is a field-proven, high-integrity trip interface board for GE gas turbine control systems. Its hardware-based two-out-of-three voting logic provides fail-safe operation without relying on software, ensuring that a single relay failure cannot cause an inadvertent trip or prevent a necessary trip. Integrated flame detection and comprehensive diagnostics make the IS200TRPGH1BCC an essential component for safe and reliable turbine operation.
Key advantages include:
TMR architecture for high availability
No software voting delays – hardware relay logic for instant response
Integrated flame detector interface – reduces external components
Removable terminal blocks – easy maintenance
Automatic ID checking – prevents wrong board insertion
MOV protection – extends solenoid life
