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TECHNICAL SPECIFICATIONS:
Part Number: IS230TPROH3CA
Manufacturer: General Electric (GE) / GE Vernova
Series: Speedtronic Mark VI / Mark VIe Protection Subsystem
Functional Acronym: TPRO
Product Type: Emergency Turbine Protection DIN-Rail Module
Hardware Revision: H3CA
Redundancy Configuration: Compatible with Triple Modular Redundant (TMR) VPRO Protection Systems
Speed Pickup Inputs: Up to 9 passive magnetic speed pickups or active pulse-rate transducers
Thermocouple Inputs: 9 inputs supporting Type E, J, K, S, and T thermocouples
Analog Inputs: 3 isolated analog inputs (4–20 mA current loops)
Voltage Inputs: Generator and Bus Voltage via 2 single-phase PTs
Nominal PT Voltage: 115 V rms secondary
Maximum PT Cable Distance: 100 m (328 ft) using 18 AWG twisted shielded cable
Power Supply: 28 V DC supplied from VPRO for analog transmitters
MPU Input Resistance: 200 Ω with 85 mH inductance
MPU Pulse Rate Range: 2 Hz to 20 kHz
MPU Sensitivity: 27 mV peak at 2 Hz; 450 mV peak at 14 kHz
Thermocouple Input Load: Less than 3 VA per input
Voltage Accuracy: ±0.5% of rated voltage rms
Frequency Accuracy: ±0.05%
Phase Difference Measurement: Better than 1°
Synchronization Voltage Range: 75 to 130 V rms
Operating Temperature: -30°C to +65°C (-22°F to +149°F)
Diagnostic Features: Integrated Board-ID Flash Chip for serial number, revision, and type verification
Mounting Method: Compact DIN-Rail Assembly
Repair Lead Time: 3–5 Business Days
Availability: In Stock / Repair & Exchange Available
Country of Origin: United States
IS230TPROH3CA is an Emergency Turbine Protection DIN-rail Module designed and manufactured by General Electric as part of the Mark VI Series used in GE Speedtronic Control Systems. TPROH3CA provides the VPRO with speed signals, temperature signals, generator voltage, and bus voltage as part of an independent emergency overspeed and synchronization protection system. The protection system consists of triple redundant VPRO boards in a module separate from the turbine control system, controlling the trip solenoids through TREX (TREG, or TREL, or TRES). TPRO supplies inputs to all three VPRO boards. The following figure shows the cabling to VPRO from the TPRO and TREX terminal boards. The VPRO board provides the emergency trip function. Up to three trip solenoids can be connected between the TREX and TRPX (TRPG, or TRPL, or TRPS) terminal boards. TREX provides the positive side of the 125 V dc to the solenoids, and TRPX provides the negative side. Either board can trip the turbine. VPRO provides emergency overspeed protection and emergency stop functions. It controls the 12 relays on TREG, nine of which form three groups of three to vote inputs controlling the three trip solenoids. A second TREG board may be driven from VPRO through J4.
INSTALLATION:
The generator and bus potential transformers, analog inputs, and thermocouples are wired to the first terminal block on TPRO. The magnetic speed pickups are wired to the second block. Jumpers JP1A and JPIB are set to give either a 4-20 mA or a voltage input on the first of the three analog inputs. The wiring connections are shown in the following figure. Two cables go to each of the three VPRO boards.
OPERATION:
The main purpose of the TPRO is to supply speed signals to VPRO for the emergency overspeed (EOS) protection for the turbine. In addition, TPRO supplies generator signals for backup synchronization check protection, three analog current inputs, and nine thermocouple inputs, primarily for exhaust over-temperature protection on gas turbines. VPRO provides 28 V dc to TPRO to power the three analog input transmitters.
SPEED CONTROL AND OVERSPEED PROTECTION
Speed control and overspeed protection are implemented with six passive, magnetic speed pickups. The first three are monitored by the controller, which uses the median signal for speed control and the primary overspeed protection. The second three are separately connected to the three VPROs in the protection module. Provision is made for nine passive magnetic speed pickups or active pulse rate transducers (TTL type) on the TPRO terminal board, with three being monitored by each of the three VPROS.
BACKUP SYNCH CHECK PROTECTION
TPRO provides inputs to the protection module for backup synchronization check. The generator and bus voltages are supplied from two single-phase potential transformers (PTs) secondary outputs, supplying a nominal 115 V rms. The maximum cable length between the PTs and the turbine control is 100 meters of 18 AWG twisted, shielded wire. Each PT is magnetically isolated with a 1,500 V rms rated barrier and a circuit load less than 3 VA.
Each PT input is internally connected in parallel through TPRO to the three VPROS in the protection module. The triple redundant phase slip windows result in a voted logical output on the TREG terminal board, which drives the K25A relay. This relay's contacts are connected in series with the synch permissive relay (K25P) and the auto synch relay (K25) to ensure that no false command is issued to close the generator breaker. Similarly, contacts from the K25A contact are connected in series with the contacts from remote, manual synchronizing equipment to ensure no false commands.
WHY PARTNER WITH WORLD OF CONTROLS
WOC offers the largest inventory of OEM replacement parts for GE Speedtronic Control Systems, ensuring that you have access to high-quality, reliable components when you need them most. In addition to supplying unused OEM parts, we also provide repaired and rebuilt boards, all backed by a warranty for your peace of mind. Our experienced team of automation experts is available 24/7 to assist with any OEM-related requirements, from troubleshooting and repairs to recommending the right replacement parts. Whether you need support for urgent system repairs or routine maintenance, WOC is committed to delivering fast, dependable solutions tailored to your needs. For detailed pricing, availability, or technical assistance regarding parts and repairs, please reach out to our team via phone or email, and we will be happy to provide prompt support.
What is the GE IS230TPROH3CA?
The IS230TPROH3CA is an Emergency Turbine Protection (TPRO) module manufactured by General Electric for its Mark series turbine control systems. It is a compact, ruggedized unit designed to snap directly onto a standard DIN rail inside the control cabinet. It acts as an independent safety barrier that collects and conditions critical, real-time data—including rotor speeds, exhaust temperatures, and grid synchronization voltages—and feeds them directly into the system's independent, triple-redundant VPRO backup safety processors to prevent catastrophic equipment failures.
What is the primary role of the GE IS230TPROH3CA within the control system?
It serves as the physical landing pad and conditioning interface for protective field sensors. It isolates, protects, and cleans up electrical noise for up to 9 magnetic speed pickups, 9 exhaust thermocouples, 3 analog loops, and 2 potential transformers involved in emergency overspeed trips and synchronization check protection.
How does the TPRO module communicate with the turbine trip solenoids?
The TPRO board does not directly activate the trip solenoids. Instead, it sends conditioned field telemetry to the VPRO boards. The VPRO logic then votes on these inputs and operates 12 safety relays located on a connected TREX series board (such as TREG). These relays control the positive and negative legs of the 125 V DC loop required to energize or de-energize the trip solenoids.
Can the IS230TPROH3CA support both passive and active speed sensors?
Yes. The module features an input circuit capacity designed to accept up to nine speed sensors. It accommodates standard passive magnetic speed pickups (MPUs) as well as active, digital TTL-type pulse-rate transducers.
What onboard adjustments must be completed when installing a replacement board?
When dropping in a replacement board, installers must check the physical configuration of the JP1A and JP1B hardware jumpers. These jumpers dictate whether the first analog input channel functions as a standard 4–20 mA current loop or as a direct voltage signal input.
How does the module handle grid synchronization checks without causing main control faults?
The board terminates secondary lines from two single-phase potential transformers (PTs) monitoring the generator and main bus. Each channel is isolated up to 1,500 V rms to prevent ground loops. This voltage data is analyzed by three separate VPRO processors whose outputs are voted on the TREG board via the K25A relay, keeping the emergency safety line completely separate from the main controller.
How does the system ensure the correct revision of the TPRO board is connected?
The board features an internal, non-volatile Board-ID Flash Chip containing hardcoded data, including the board type, revision group (H3CA), and unique factory serial number. Upon system startup, the coupled VPRO board scans this chip to verify hardware compliance before opening safety relays.
