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TECHNICAL SPECIFICATIONS:
Part Number: IS215VPROH2B
Manufacturer: General Electric
Series: Mark VI
Functional Acronym: VPRO
Product Type: Emergency Turbine Protection Assembly Module
Number of Inputs: 3
Number of Outputs: 6
Board Dimensions: 33.0 cm H x 17.8 cm W
Product Weight: 2.4 kg (5.00 lbs)
Onboard Power Supply Input: 125 V dc from cabinet PDM
Generated Voltages: 5 V dc and 28 V dc
Redundancy Setup: Triple Modular Redundant (TMR) - R8, S8, and T8
Supported Terminal Boards: TPRO and 1 x TREG
Front Panel Ports: 1 x Power Plug, 1 x Ethernet ID, 1 x IONet (Ethernet), 1 x Parallel port, 5 x D-shell ports
Speed Sensing Support: 6 passive, magnetic speed pickups
Repair Lead Time: 3-7 Business Days
Availability: In Stock
Country of Origin: United States
Manual Reference: GEH-6421J
The IS215VPROH2B is an Emergency Turbine Protection Board designed and manufactured by General Electric for the Speedtronic Mark VI gas and steam turbine control system series. The Turbine Protection Board (VPRO) and associated terminal boards (TPRO and TREG) provide an independent emergency overspeed 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 TREG. VPRO also has an Ethernet connection for IONet communications with the control modules. The VPRO board in the Protection Module P provides the emergency trip function. Up to three trip solenoids can be connected between the TREG and TRPG terminal boards. TREG provides the positive side of the 125 V dc to the solenoids, and TRPG 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. The original VPROH1A has been superseded by the functionally equivalent VPROH1B. VPROH1A and VPROH1B support a second TREG board driven from the VPRO connector J4. VPROH2B is a lower-power version of VPRO that omits support for the second TREG board. Applications using a second TREG board connected to J4 must use VPROH1A or VPROH1B, not VPROH2B.
OPERATION:
The main purpose of the protection module is emergency overspeed (EOS) protection for the turbine, using three VPRO boards. In addition, VPRO has backup synchronization check protection, three analog current inputs, and nine thermocouple inputs, primarily intended for exhaust over-temperature protection on gas turbines. The protection module is always triple redundant with three completely separate and independent VPRO boards named R8, S8, and T8 (originally named X, Y, and Z). Any one of these boards can be powered down and replaced while the turbine is running without jeopardizing the protection system. Each board contains its own I/O interface, processor, power supply, and Ethernet® communications (IONet) to the controller. The communications allow initiation of test commands from the controller to the protection module and the monitoring of EOS system diagnostics in the controller and on the operator interface. Communications are resident on the VPRO board, which is the heart of the system. The VPRO board has a VME interface to allow programming and testing in a VME rack; however, the backplane is neutralized when plugged into the protection module to eliminate any continuity between the three independent sections.
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 controllers, which use the median signal for speed control and primary overspeed protection. The second three are separately connected to the R8, S8, and T8 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 R8, S8, and T8 VPROs. Separate overspeed trip settings are programmed into the application software for the primary and emergency overspeed trip limits, and a second emergency overspeed trip limit must be programmed into the I/O configurator to confirm the EOS trip point.
The speed is calculated by counting passing teeth on the wheel and measuring the time involved. Another protection feature is the calculation of the rate of change of speed, which is compared with 100% and transmitted to the controller to trip the unit if it is detected after the turbine reaches a predetermined steady-state speed. This steady-state speed limit is a tuning constant located in the controller’s application software. Another speed threshold, which is monitored by the EOS system, is 10% speed. This is transmitted to the controller to verify that there is no gross disagreement between the first set of three speed pickups being monitored by the controller (for speed control and the primary overspeed protection) and the second set of three speed pickups being monitored by the EOS system.
INTERFACE TO TRIP SOLENOIDS:
The trip system combines the Primary Trip Interface from the controller with the EOS Trip Interface from the protection module. Three separate, triple-redundant trip solenoids (also called Electrical Trip Devices - ETDs) are used to interface with the hydraulics. The ETDs are connected between the TRPG and TREG terminal boards. A separately fused 125 V dc feeder is provided from the turbine control for each solenoid, which energizes in the run mode and de-energizes in the trip mode.
BACKUP SYNCH CHECK PROTECTION:
Backup sync check protection is provided in the Protection Module. 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. The synch algorithms are based on phase lock loop techniques. Phase error between the generator and bus voltages is less than a degree at nominal voltage and 50/60 Hz. A frequency range of 45 to 66 Hz is supported, with the measured frequency within 0.05% of the input frequency. The algorithm is illustrated under TTUR, generator synchronizing.
World of Controls specializes in supplying high-quality, warranty-backed OEM replacement parts, including unused surplus and professionally rebuilt components, for critical turbine control and industrial automation systems like the General Electric Mark VI platform. To minimize customer downtime and ensure original equipment standard compliance, every component undergoes rigorous inspection, testing, and verification in an advanced electronics lab. Beyond parts distribution, the company delivers comprehensive, global support through 24/7 technical assistance, expert troubleshooting, component repair services, and rapid shipping, ensuring optimal efficiency and long-term reliability for critical industrial operations worldwide.
What is GE IS215VPROH2B?
It is an Emergency Turbine Protection Board developed by General Electric for Mark VI Speedtronic turbine control systems, providing independent emergency overspeed and stop protection.
How does the VPRO assembly achieve high-dependability fault tolerance?
The module runs in a Triple Modular Redundant (TMR) configuration utilizing three independent VPRO boards (R8, S8, T8), allowing any single card to be replaced live while the turbine is running.
What is the primary difference between the VPROH2 and VPROH1 boards?
The VPROH2 (including the H2B) is a lower-power card engineered to support only one connected TREG terminal board, whereas the VPROH1 assembly can drive two TREG boards.
How is the emergency trip circuit electrically protected and voted?
The VPRO controls 12 relays on the TREG board. Nine of these relays are split into three groups of three to form a hardware voting matrix that independently manages up to three trip solenoids.
What internal power distribution functions are located on the board?
Each VPRO card houses its own on-board power supply that accepts a primary 125 V dc feed from the cabinet's power distribution module (PDM) to generate localized 5 V dc and 28 V dc rails.
