GE IS215VPROH1B Turbine Protection Module

FUNCTIONAL DESCRIPTION:

The IS215VPROH1B is a Turbine Protection Board designed for the Mark VI system. The Turbine Protection Board (VPRO) and its associated terminal boards (TPRO and TREG) provide an independent emergency overspeed protection system. The protection system consists of three redundant VPRO boards in a module separate from the turbine control system, which control the trip solenoids via TREG. VPRO also has an Ethernet connection for IONet communications with the control modules.

IS215VPROH1B  Installation

To install the VPRO board

1. Turn off the VME I/O processor rack.
2. Insert the VPRO board and use your hands to push the top and bottom levers in to seat the edge connectors.
3. Tighten the captive screws on the front panel’s top and bottom.
4. Power up the VME rack and check the diagnostic lights at the top of the front panel

Cable connections to the TPRO and TREG terminal boards are made at the VPRO front panel connectors J3, J4, J5, and J6. To secure the cables, these are latching connectors. J7 is a 125 V dc power connector. Refer to the section on diagnostics in this document for more information. You may need to update the VPRO firmware to the most recent version.

Diagnostics

Three LEDs at the top of the VPRO front panel indicate status. The normal RUN condition is a flashing green, while the FAIL condition is a solid red. The third LED is STATUS, which is normally off but displays a steady orange if the board has a diagnostic alarm condition. VPRO performs diagnostic checks and generates faults in the following ways:

• Feedback from the trip relay driver and contacts
• Solenoid voltage and source of solenoid voltage
• Economizer relay driver and contact feedbacks
• Relay driver and coil K25A
• Contact feedback and servo clamp relay driver
• All analog inputs have high and low limits.
• If any of the above signals fails, a composite diagnostic alarm L3DIAG VPROR, S, or T is generated. Individual diagnostic signals can be latched and then reset with the RESET DIA signal if they become healthy.

Features

• The Board protects against backup synch checks and detects speed differences.
• The thermocouple and analog inputs are both supported by the board. Two circuit boards are stacked one on top of the other in this module.
• The top board, an IS200VPRW, is inserted into standoffs and connects to the lower board by four screw connections. Integrated circuits, a transformer, multiple transistors, as well as resistors, capacitors, and diodes, are all present on the board. Carbon composite material is sometimes used to make resistors.
• There are various inductor coils on the board, as well as numerous connectors, including plugs. A heat sink can be found on the right front side.
• The module’s bottom board has two backplanes. There are capacitors and resistors, as well as many integrated circuits, in it. Oscillating chips are included in this category. The top board’s standoffs are set towards the board’s margins.
• The module uses the TREG board to regulate trip solenoids. The controller’s application software is used to start tests on these trip solenoids. These can also be tripped manually.
  A faceplate is included with the board. LED indicators, a power switch, cable connectors, and Ethernet connectors are all found on the faceplate. Screws attach this faceplate to the boards.

Service