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Page 1

Product Manual 85018V1
(Revision E)

Original Instructions








505E Digital Governor
for Extraction Steam Turbines

Volume 1


Manual 85018 consists of 2 volumes (85018V1 & 85018V2).

Installation and Operation Manual

Page 2

General
Precautions

Read this entire manual and all other publications pertaining to the work to be
performed before installing, operating, or servicing this equipment.

Practice all plant and safety instructions and precautions.

Failure to follow instructions can cause personal injury and/or property damage.







Revisions

This publication may have been revised or updated since this copy was produced.
To verify that you have the latest revision, check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, on the publications
page of the Woodward website:

www.woodward.com/publications

The latest version of most publications is available on the publications page. If
your publication is not there, please contact your customer service representative
to get the latest copy.







Proper Use

Any unauthorized modifications to or use of this equipment outside its specified
mechanical, electrical, or other operating limits may cause personal injury and/or
property damage, including damage to the equipment. Any such unauthorized
modifications: (i) constitute "misuse" and/or "negligence" within the meaning of
the product warranty thereby excluding warranty coverage for any resulting
damage, and (ii) invalidate product certifications or listings.







Translated
Publications

If the cover of this publication states "Translation of the Original Instructions"
please note:

The original source of this publication may have been updated since this
translation was made. Be sure to check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.







Revisions—Changes in this publication since the last revision are indicated by a black line

alongside the text.









Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is
believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly
undertaken.

© Woodward 1997
All Rights Reserved

Page 111

Manual 85018V1 505E Digital Governor






Woodward 99

Steam Map Limiter in Control Extr/Adm Priority Selected
Modbus Command Extr/Adm Priority Active



Relay Clarifications

The Shutdown Condition relay may be programmed to indicate a shutdown
condition on a remote panel or to a plant DCS. The Shutdown Indication relay is
normally de-energized. This relay will energize upon any shutdown condition and
stay energized until all trips have been cleared. The ‘RESET CLEARS TRIP’
function has no effect on the programmable Shutdown Indication relay.

When programmed as a Trip relay, the respective relay will function like the
dedicated “Shutdown” relay (normally energized and de-energizes on a
shutdown) to indicate the position of the dedicated Shutdown relay. This relay
output can be programmed to indicate a 505E initiated trip by setting the ‘Ext
trips in Trip Relay’ option to NO. Using this option, 505E trip annunciation will
only occur if the 505E tripped the turbine and not annunciate when the other
external devices shuts down the unit (external trips).

The Alarm Condition relay may be programmed to indicate an alarm condition on
a remote control panel or to a DCS. The Alarm Indication relay is normally de-
energized. This relay will energize upon any alarm condition and stay energized
until all alarms have been cleared. If the ‘BLINK ALARMS’ option is ‘YES’ the
programmable Alarm Condition relay will toggle on and off repeatedly when an
alarm condition has occurred. With this configuration if a reset command is given
and the alarm condition still exists, the relay will stop toggling and stay energized.

The 505E Control Status OK relay is normally energized, and will only de-
energize if unit input power is lost, the 505E’s CPU fails, or the 505E is in the
program mode.

The Overspeed Test Enable relay will energize when an Overspeed Test is
performed. This relay functions like the 505E OSPD key’s LED (it repeatedly
toggles on and off when turbine speed is above the turbine Overspeed trip
setting).

An Underspeed Switch function can be programmed to indicate a turbine
underspeed or overpower condition. If the Underspeed option is configured, once
turbine speed reaches a level above the minimum governor speed setting, then
decreases 100 rpm below the minimum governor speed setting, the respective
relay energizes (indicating an underspeed condition). The ‘Underspeed setting’ is
adjustable through the Service mode, under the ‘Speed Values’ header.

When the Sync Enabled function is programmed, the assigned relay energizes
when a synchronize command is given. After the unit generator or utility tie
breaker is closed this function becomes disabled and the relay de-energizes. The
505E’s Synchronization function can be used to synchronize across a generator
breaker or utility tie breaker.

When the Sync / Load Shr Active function is programmed, the assigned relay
energizes when a synchronizing or Load Sharing is active. When both the
generator and utility tie breaker inputs are closed (Load Sharing not selected)
this function becomes disabled and the relay de-energizes.

Page 112

505E Digital Governor Manual 85018V1






100 Woodward

When the (F3,F4) Key Selected function is programmed, the assigned relay
energizes when the respective function key is pressed and an enable/disable
command issued. This feature allows the 505E’s F3 and F4 function keys to be
used as panel switches to select and/or enable system related functions (i.e.
synchronizing).

When the Modbus Command function is programmed, the assigned relay
energizes when the respective Modbus command “Turn On Modbus Relay X” is
issued, then de-energizes when the respective Modbus command “Turn Off
Modbus Relay X” is issued. This feature allows a 505E relay to be driven directly
from Modbus to control a system related function (i.e. synchronizing). In addition,
the assigned relay can be momentarily energized using the Modbus command
“Momentarily Energize Modbus Relay X” is issued (i.e. voltage raise/lower
commands). Refer to Chapter 6 of this manual for more information on Modbus
commands.

Page 221

Revision History


Changes in Revision E—
Changed field wiring requirement (pages vi, 2, 24)

Page 222

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Send comments to: [email protected]

Please reference publication 85018V1E.












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