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SPECIFICATIONS:
Part Number: IS230SPROH2A
Manufacturer: General Electric
Series: Mark VIe
No.of Analog Voltage Inputs: 6
Product Type: Backup Protection Terminal Board
Magnetic speed pickup pulse rate range: 2Hz to 20,000Hz
Magnetic speed pickup pulse rate accuracy: 0.05%
Magnetic speed pickup sensitivity: 27 mV pk
Speed Input Sensitivity: 0-2 kHz
Technology: Surface Mount
Common Mode Voltage Range: ±5 V
Size: 15.9 cm high x 17.8 cm wide
Operating temperature: 30 to 65 °C
Repair: 3-7 Days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721D
FUNCTIONAL DESCRIPTION:
IS230SPROH2A is a Simplex Backup Protection Terminal Board manufactured and designed by General Electric as part of the VIe Series used in GE Distributed Gas Turbine Control Systems. The SPROH2A terminal board is designed to host a PPRO I/O pack and is responsible for conditioning speed signal inputs before they are processed by the PPRO. It also incorporates a pair of potential transformers (PTs) that provide voltage inputs for both the generator and the bus. Positioned next to the PPRO pack connector is a DC-37 pin connector, which allows connection through a cable to a Mark VIe backup trip relay terminal board, enabling communication with the system’s backup protection circuitry.
The SPROH2A variant is equipped with 24 barrier terminals arranged in a pluggable terminal block, while the SPROH2A version uses 24 pluggable Euro-style box terminals to facilitate wiring and installation flexibility. Within a Mark VIe control system, the SPRO terminal board and PPRO I/O pack work together with cabling connected to a trip relay terminal board to provide backup protection functionality. The system’s primary protection, however, is managed through the PTUR and TTUR modules along with a primary trip relay terminal board, ensuring reliable monitoring and protection of turbine and generator operations.
INSTALLATION:
The SPROH2A and a plastic insulator are mounted on a sheet metal carrier, which mounts on a DIN rail. Optionally, the SPRO and insulator are mounted on a sheet metal assembly, which bolts directly to a panel. Speed signals and PT inputs are wired directly to the terminal block using typical #18 AWG wires. The SPROH1A barrier terminal block is removable for board replacement. The SPROH2A Euro-Block type terminal block has terminals that can be removed for board replacement. The PPRO I/O pack mounts directly on connector JA1 of the SPRO. A DC-37 pin conductor cable plugs into connector JA3 of SPRO with the other end attached to the selected backup trip terminal board.
OPERATION:
The PT inputs to the SPRO terminal board are connected through terminals 1 to 4, which are designated for receiving voltage signals from the potential transformers. These inputs allow the board to monitor both bus voltage and generator voltage, enabling accurate voltage measurement and conditioning before the signals are processed by the connected PPRO I/O pack. The conditioning of these voltage signals ensures reliable data transmission to the protection system and supports the proper operation of backup protection functions within the control architecture.
The speed signal inputs are connected through terminals 19 to 24, where three independent speed input channels are provided. These inputs typically receive signals from speed sensors or pickups installed on the turbine or generator shaft. The SPRO board conditions these speed signals and forwards them to the PPRO I/O pack for further processing, which is essential for monitoring turbine speed and detecting abnormal conditions such as overspeed.
Terminals 7 to 15 are allocated for future control feature expansion. Although these terminals are not actively used in the current configuration, they are internally routed to the JA1 connector, which interfaces with the PPRO pack. This design provides flexibility for future system upgrades or additional protection and monitoring features without requiring major hardware modifications.
Terminals 5 and 6, along with terminals 16 to 18, do not have any internal connection on the board. These terminals remain unused and are intentionally left without circuitry to maintain layout consistency and allow potential future implementation if required.
The JA1 and JA3 connectors play a critical role in the board’s integration within the protection system. The JA1 connector serves as the mounting and communication interface for the PPRO I/O pack, enabling signal transfer and processing between the terminal board and the controller. The JA3 connector is used to connect the cable leading to the trip relay terminal board, ensuring that processed signals can be transmitted to the backup trip protection system.
WOC maintains the largest inventory of OEM replacement parts for GE Distributed Control Systems, ensuring that you have access to the components you need without delay. In addition to supplying unused and fully rebuilt boards, we also offer expert repair services to restore faulty boards to like-new condition, all backed by a reliable warranty for your peace of mind. Our experienced team is available 24/7 to provide guidance and support for any OEM or automation-related requirements, helping you minimize downtime and keep your systems running smoothly. For pricing, availability, or technical assistance with parts and repairs, simply reach out to our team via phone or email, and we’ll ensure you receive prompt, personalized support.
How does IS230SPROH2A condition speed signals for the PPRO I/O pack?
The board receives raw turbine speed signals via terminals 19–24 and routes them through dedicated input conditioning circuits that include filtering, impedance matching, and isolation. This ensures that high-frequency noise or transient spikes from magnetic pickups do not propagate to the PPRO. The conditioned signals maintain waveform integrity, enabling precise overspeed detection and rotational speed monitoring.
How are PT voltage inputs isolated and processed to maintain protection reliability?
PT inputs on terminals 1–4 are routed through precision isolation circuits before reaching the PPRO I/O pack. This prevents ground loops and crosstalk between bus and generator voltage signals. The board ensures accurate amplitude and phase representation of PT signals, which is critical for reliable backup trip decisions.
Why are terminals 7–15 reserved for future expansion, and how is signal integrity maintained?
Terminals 7–15 are internally routed to the JA1 connector but left unpopulated to accommodate future control or monitoring features. Even when unused, their traces are physically separated from active signal paths to avoid introducing interference or capacitance that could affect speed or voltage signals. This modular approach enables seamless future upgrades without impacting existing protection functions.
How does the SPROH2A interface with the trip relay board for backup protection?
Conditioned speed and voltage signals are transmitted via the JA3 connector to the trip relay terminal board. The relay board independently evaluates these signals, providing a backup trip path separate from the primary PTUR/TTUR route. This redundancy ensures that turbine overspeed or voltage anomalies trigger protective actions even if the primary path fails.
Why are terminals 5–6 and 16–18 left unconnected, and what is their future potential?
These terminals are intentionally left without connections to maintain terminal block uniformity and reduce the risk of accidental cross-connection. Their traces are physically isolated, preventing interference with active circuits. They can be repurposed in future designs for additional speed channels, voltage inputs, or diagnostic signals without redesigning the PCB.
How do the JA1 and JA3 connectors maintain signal fidelity under high-density wiring conditions?
JA1 and JA3 use high-density, keyed connectors that provide controlled impedance paths and secure mating with the PPRO pack and trip relay cable. Signal traces leading to these connectors include differential routing and isolation planes to minimize electromagnetic interference. This ensures that both speed and voltage data are delivered reliably, even in electrically noisy environments.
