IS215VPROH2BD GE MKVI, VME Protection Module (Std. Capacity)

Description:

IS215VPROH2B is a Turbine Protection Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic gas turbine 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:

Turn off the VME processor I/O rack.
After positioning the edge connectors with your hands, slide the VPRO board into place.
Tighten the front panel's top and bottom captive screws.
Turn on the VME rack and examine the front panel's top diagnostic lights.
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 controller. The communications allow the 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 IS215VPROH2B is an Emergency Turbine Protection card (VPRO.)  This PCB, along with its associated terminal boards (TPRO/TREG,) provides a system of independent emergency overspeed protection for the Mark VI.  Trip solenoids for this module, which is separate from the turbine control system, are located on the TREG board. The turbine can be tripped by either terminal board.  The TREG board provides a positive connection to the solenoids and the TPRO provides the negative. BE aware the VPROH2 is a lower power board that is only able to support one TREG.  If two TREG boards are necessary, please order a VPROH1 board.

The IS215VPROH2B has a front faceplate.  This is built with several components built into the panel, including a power plug, an Ethernet ID connector, an IONet port (Ethernet,) and a parallel port.  There are five additional D-shell ports and several LED indicators located on its surface.

The rear part of the IS215VPROH2B contains two boards stacked together. The top board includes a female power plug that wires into the front faceplate, two backplanes, TP test points, capacitors, integrated circuits, and a number of integrated circuits.  The board also has several vertical connectors and a heat sink component that spans the entire width of the board. The bottom board shares many of these components and has several vertical pin male connectors.  The boards are connected together using screw connections threaded through standoffs.

Datasheet Link:

IS215VPROH2BD GE MKVI, VME Protection Module Datasheet General Electric