Manual 85018V1
505E Digital Governor
Woodward
3
6. AUX DIRECT ENTERED SETPT: Changed Aux Entered setpoint to be reset/
stopped on a shutdown pulse rather than held disabled on a shutdown
condition. This change allows the Aux Limiter function direct setpoint entry
even when the unit is tripped.
7. AUX, CASC, and EXTR DROOP: Changed the droop feedback lag-tau
tunable range from a max of 10 to a max of 1000.
8. DECOUPLED CASCADE CONTROL: Added a lag to the speed the speed
setpoint is using during a utility tie breaker open setback. Also updated the
logic used to reset the speed setpoint to minimize to bump experienced when
Decoupled Casc is disabled. Changed logic to fix a problem where breaker
opening while in the Cascade decoupled mode would cause the HP valve to
close then open unexpectedly.
9. MODBUS: Changed the Gen and Tie Open alarms for Aux, Casc, and
Remote to match the Modbus listing—the software eventlatch inputs were
reversed/backwards with the Modbus listing.
10. CONTROLLED STOP: Made the Controlled Stop abort if speed raise/lower is
selected or another control mode is selected. This can be tuned-out by
setting CNTRL_STOP.RL_STOP.IN_2=*false in the debug mode.
11. ANALOG INPUTS: Changed max setting on the delay time’s tunable range
from 3 ms to 3000 ms. The analog input failure delay setting is defaulted to
zero but can be adjusted up to 3000msec using the debug mode
MAIN.AIx.LATCH_DLY where x is the analog input number. Added a tunable
single pole filter (LAG) to each analog input. Output/input = 1/(1+st) where t =
1/(2(pi)f) = LAG_TAU. The Lag-tau is defaulted to zero but can be adjusted
in the debug mode using MAIN.AIx_LAG.LAG_TAU where x is the analog
input number (1-6).
General Description
General
The 505E is a 32-bit microprocessor-based control designed to control single
extraction, extraction/admission, or admission steam turbines. The 505E is field
programmable which allows a single design to be used in many different control
applications and reduces both cost and delivery time. It uses menu driven
software to instruct site engineers on programming the control to a specific
generator or mechanical drive application. The 505E can be configured to
operate as a stand-alone unit or in conjunction with a plant’s Distributed Control
System.
Operator Control Panel
The 505E is a field configurable steam turbine control and operator control panel
(OCP) integrated into one package. A comprehensive operator control panel,
including a two- line (24 characters each) display, and a set of 30 keys is located
on the 505E’s front panel. This OCP is used to configure the 505E, make On-
Line program adjustments, and operate the turbine/system. Easy to follow
instructions are presented in English through the OCP’s two-line display and
operators can view actual and setpoint values from the same screen.
