IS215VPROH1BH - Turbine Protection Board

SPECIFICATIONS:

Part Number: IS215VPROH1BH
Manufacturer: General Electric
Series: Mark VI
Product Type: Turbine Protection Board
Number of Inputs: 4 - 20 mA
Number of Outputs: 6
Power Supply Voltage: 125 V DC
Thermocouple types: E, J, K, S, T
Span: -8 mV to +45 mV
Common Mode Voltage Range: ±5 V
Dimensions: 16.51 cm High x 17.8 cm
Operating temperature: 30 to 60 °C
No.of Analog Voltage Inputs: 6
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721H

FUNCTIONAL DESCRIPTION:

IS215VPROH1BH is a Turbine Protection Board manufactured and designed by General Electric as part of the VI Series used in GE Speedtronic Control Systems. 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. The VPRO board in the Protection Module

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. A second TREG board may be driven from VPRO through J4.

INSTALLATION:

• Power Down the VME I/O Processor Rack: Before beginning installation, safely shut down the VME rack and disconnect power completely. Ensure all software processes are halted, and all indicator LEDs are off to avoid electrical hazards.
• Insert the VPRO Board: Align the board with the designated VME slot and carefully slide it in. Use both hands to push the top and bottom locking levers inward, ensuring the edge connectors are fully seated for a secure connection.
• Secure the Board: Once inserted, tighten the captive screws at the top and bottom of the front panel. This secures the board and prevents movement or vibration-related disconnection during operation.
• Restore Power and Verify Installation: Switch the power back on and observe the diagnostic LEDs located at the top of the front panel. These indicators will show the initialization and status of the board. Refer to the GE manual for LED definitions and normal operational patterns.

OPERATION:

The VPRO board’s primary function is to provide Emergency Overspeed System (EOS) protection through a triple-redundant setup. It also offers:

• Backup synchronization check protection.
• Three analog current inputs.
• Nine thermocouple inputs, mainly used for exhaust over-temperature protection.

Each VPRO board has its own I/O controller and communicates with the turbine controller to execute test commands and monitor diagnostics. The VME interface allows programming and testing, while the backplane is neutralized in protection mode to maintain isolation between R8, S8, and T8.

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.

WOC has the largest stock of OEM Replacement Parts for GE Speedtronic Control Systems. We can also repair your faulty boards and supply unused and rebuilt boards backed up with a warranty. Our team of experts is available around the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on parts and repairs, kindly contact our team by phone or email.

FREQUENTLY ASKED QUESTIONS:

What type of analog inputs and outputs does the IS215VPROH1BH have?

The board features three analog current inputs (4–20 mA), six analog voltage inputs, and six output signals for system control and monitoring. These inputs are used to monitor turbine operating conditions, while outputs interact with connected systems like the TREG board, enabling real-time protection actions.

What thermocouple types are supported by the Turbine Protection Board?

The board supports five standard thermocouple types: E, J, K, S, and T. These are commonly used in industrial applications to monitor exhaust gas temperatures, especially in gas turbines. The input span supported by the board ranges from -8 mV to +45 mV, and the thermocouples help trigger alarms or trips in case of over-temperature conditions that could damage the turbine or related systems.

What is the typical lead time for Turbine Protection Board repairs?

The standard repair lead time ranges from 3 to 7 working days, depending on the board’s condition and the complexity of the repair required. WOC provides thorough diagnostic testing, component-level repair, and functional verification using OEM test setups. Fast-track repairs may be available upon request, depending on urgency and availability.