Woodward 8200-513 DVP Digital Valve Positioner

Each of the three ProTech units must be reset before the turbine is started. A unit

is reset by pressing the front panel RESET button or by momentarily closing the

remote reset contact (TB5-4 to TB5-5). After the power-up self-tests, each

ProTech unit begins executing its speed-sensing algorithm. If the speed does not

exceed the MPU FAIL SETPOINT speed within the MPU FAIL TIMEOUT value,

the unit trips. At this time the MPU FAIL LED turns on and remains on until the

next reset. This trip is not affected by the TRIP ON MPU FAILURE option. The

ProTech overspeed protection system will trip on an overspeed condition during

start-up.

Normal Operation

If an overspeed is detected, the unit trips. As the speed exceeds the currently

displayed peak speed, the peak speed is updated and stored in non-volatile

memory. The operator interface is still active. That is, all parameters can be

displayed, and tunable parameters can be changed.

Peak speed is not stored in non-volatile memory if an overspeed condition has

not occurred.