Woodward 8251-0003 UG Actuators

The active voltage regulation concept intends to substitute a traditional

voltage regulation configuration by simplifying the overall topology. The

easYgen internal controller regulates generator output voltage by sending a

pulse width modulation (PWM) signal to the excitation module. The excitation

module controls generator excitation and therefore generator output voltage.

This topology eliminates the redundant voltage and current sensing from a

traditional voltage regulator and also makes a feedforward control architecture

at AVR level simplifying the cascaded PID control topology. For power input,

EX-10 interfaces with any of the following excitation systems: Self/Shunt

Excitation, Auxiliary winding/AREP Excitation and Permanent Magnet (PMG)

Excitation systems to make it a standard yet versatile solution.

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.

To reset a unit's peak speed, place the key switch in the PROGRAM position,

then press the RESET key. The message "RESET PEAK? ADJ  = YES ADJ 

= NO" appears. Press the ADJ  key to reset the peak speed. After pressing

either the ADJ  or the ADJ  keys, the unit resumes normal operation. If

neither key is pressed within 10 seconds, a "no" response is assumed and the

prompt disappears. Return the key switch to the MONITOR position.