;)'7 *YRGXMSREPHIWGVMTXMSR  

 *YRGXMSREPHIWGVMTXMSR

 +IRIVEP
In this ch apter the function al tasks of the WECS are described.
Speed measur ement is separated from oth er measur ing systems
becau se of its special character. In section 7.4 the r est of the
measurement system is described concentratin g on the distribu-
tion ph ilosophy. Safety task includes sever al function s like tim-
ings, alarms, power redu ction, start/shu tdown contr ol an d fuel
limitin g. Th ese issues are described in section 7.3. Th e features
of WEnCoM system are fitted to the WECS. The properties of this
task ar e summar ized in section 7.7.

 7TIIHQIEWYVMRK
Th e engin e speed is measured by means of two touch free indu c-
tive proximity switch es. The two pr oximity switches are mou nted
on th e engine body, an d are giving on e impulse for each cog (of
the camshaft gear ) passing the sensin g head of the sensor. One
proximity switch is conn ected to a DCU /SMU, fr om which it is
su pplied with a 15 V DC voltage. The ou tput of the sensor is
providing a speed proportional pulse train. Th e pulse output
voltage level var ies between two fixed levels: 0 V DC and the
su pply voltage level (15 V DC). The proximity switch is con nected
directly to a frequency inpu t of the DCU/SMU , and the speed
calcu lation is carried ou t in the SMU software. The updating
frequency of th e engine speed measurin g loop is 62.5 Hz. See
section 7.2.1 for more information about SMU speed measur ing.
The oth er proximity switch is also used for speed detection , but
is connected to the Relay Module. The module initiates a sh ut-
down of th e engine in case of overspeed. Also the suppression of
a backup lube oil pressu re stop is dependent of th is second
proximity switch (see section 7.3, Safety system). Th e speed pulse
signal is optocou pled and conn ected to th e MCU, which monitors
the sign al. See Fig 7-1.


  *YRGXMSREPHIWGVMTXMSR  ;)'7

7TIIHQIEWYVMRKMRXLI;)'7

Serial channel
MCU (Overspeed shutd. info, DCU/SMU ENGINE
Speed signal) Speed pick-up MOUNTED
EQUIPMENT

Overspeed shutdown

RELAY MODULE

Control panel
Analog speed signal
Ext. Relay

Safety task Stop block

Energ. stop solenoid 1
Stop solenoid

MCU stop Energ. stop solenoid 2

Stop solenoid

De-en. stop solenoid

Overspeed shutd. info
Stop solenoid

Speed pulse Backup speed pick-up

RS-485 (Modbus)

Engine shutd. info

Stop Override
"Bus speed"

Control panel Stop

Override

EXTERNAL SYSTEM

*MK 080202A9623

 ('9719WTIIHQIEWYVIQIRX
The DCU /SMU speed measur ement cou nts pu lses in a time
window. The frequency can be received by dividing th e nu mber
of pulses with time used. Th e speed can then be calculated from
the frequency by scalin g it. These calculation s ar e done in a
background indepen dent from other measu rement sequences.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

('9719WTIIHQIEWYVIQIRX

53.33 ms 53.33 ms
Counter pulses

Frequency input

A, B = Rising edges A B
following the counter pulse

*MK 080404A9623

F ig 7-2 shows the speed measur ement principles. The time

counter sends a pulse ever y 53.33 ms. The fr equ en cy calculation
stores the values of time and pulse counters at n ext risin g edge
of th e fr equ en cy input. After that the in put frequency is calcu-
lated. In F ig 7-2 th e frequency is calcu lated fr om th e pulse cou nt
and th e time between even ts A and B as follows:
P u lse cou n t A - B= . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Tim e A - B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . = 53,5 ms
F requ en cy . . . . . . . . . . . . . . . . . . . . . . . = 214 pulses / 53,5 ms
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . = 4 000 H z
Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . = 10 RP M/H z
Scaled r es ult . . . . . . . . . . . . . . . . . . . = 4 000 H z * 10 RP M/H z
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . = 40 000 RP M
Th e frequency value is set to zero (0) if no pulse occur with in 10
seconds. In engine speed measuremen t with overspeed detection
the time base is 16 ms instead of 53.33 ms. Oth erwise the
measurement procedure is th e same.

 7EJIX]W]WXIQ
Th e safety system is implemented in the software of the WECS.
In addition , th ere are some redu ndan t safety fun ctions in a
hardwired system (Relay Module). The safety system can be split
up in five major parts; starting, stopping, start blocking, sh ut
down an d power reduction .

 7XEVXMRK
Th e start system of the WECS is illustrated in F ig 7-3. The
starting system doesn’t necessarily include all of th e options
sh own in the figu re.


  *YRGXMSREPHIWGVMTXMSR  ;)'7

There ar e some important properties to be noticed in the star t

system of th e WECS:
• Th e sta r t blockin g sign al doesn ’t block t he MCU sta r t sign a l
in th e Relay Modu le. Th e block in g is done by t he softwar e in
th e MCU ,
• St ar t con dition s a r e a ll con figu ra ble s o th ey ma y va ry de-
pen din g on t h e in sta lla tion ,
• Th e en gine won ’t s tar t, if th e r eset bu tton isn ’t pressed aft er
sh u tdown . If th e Relay Modu le h as cau sed th e sh u tdown it
r equ ires th a t, th e r eset but ton con n ected to th e Rela y Module
is pres sed. Eith er loca l or r em ote r eset can be us ed, if th e
MCU h a s ca u sed th e sh ut down.
The start sequ en ce of th e MCU is shown on F ig 7-4.

7XEVXMRKSTXMSRW

MCU ENGINE
MOUNTED
Local / Remote EQUIPMENT
Safety Control panel
system RELAY MODULE
Local/
task Remote
Hardwired start Info Hardwired start
Start

Start
conditions
Hardwired Start blocking
Start signal Starting solenoid Start solenoid
Start
Start block
Ext. start blocking

HW Remote start
RS-485 (Modbus)
"Bus start"

Control panel EXTERNAL SYSTEM

Start Start

*MK 070302A9623


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

7XEVXWIUYIRGI

1 ENGINE IN STOP MODE

=1

2 C START BLOCKS?

YES NO
3 C START BLOCK
OVERRIDE?

NO YES

6 ENGINE READY TO START

16 ENGINE READY TO START START COMMAND

START COMMAND 7 C SLOW TURNING?

17 SEQUENCE 10 - 15
YES NOT NEEDED
* .X10 8 S
OR NOT IN USE
SLOW TURNING SUCCESSFUL?

4 S NO YES
START BLOCK
MODE 9 S SLOW TURN
FAILURE
START BLOCKS CLEARED
20 s / X9

5 ENGINE READY TO START

10 S - FUEL LIMITER ON
S - LUBE OIL PRESSURE STOP OVERRIDE
S - ALARM BLOCKING ON
30 s / X10 LC ACTIVATE START
SOLENOID 3 - 10 s IF SPEED < 300
11 S ALARM IF
SPEED < 300

FAILED START ATTEMPT SUCCESSFUL START

12 S 14 SPEED > 300 AND STOP SOLENOID NOT ACTIVE

START BLOCK
MODE DS ALARM BLOCKING OFF, t = 3 - 10 s
DS START HOUR COUNTER
DS FUEL LIMITER OFF, t = 2 - 10 s
20 s / X12 IF NOT START BLOCK
OVERRIDE DS OPERATE 300 RPM RELAY
DS LUBE OIL PRESSURE STOP OVERRIDE OFF
13 ENGINE READY TO START t = 2 - 10 s

START SEQUENCE ENDS

15 S ENGINE RUNNING

*MK 0703D9634

 &PEGOSYXWXEVX
In th e WECS it is possible to configu re also a special black out
start input. Black out start is done so that the start outpu t is
activated directly. Consequently the start block checking and the
slow tur ning sequences are skipped. Th is in put may be con nected
on ly to the extern al au tomation system, which in case of black out
will automatically perform this special function .


  *YRGXMSREPHIWGVMTXMSR  ;)'7

 7XSTTMRK
The stop system of the WECS is illu strated in F ig 7-5. The stop
system doesn’t necessarily include all of th e option s shown in th e
figure.

7XSTTMRKSTXMSRW

RELAY MODULE ENGINE

MCU MOUNTED
EQUIPMENT
Safety Stop block Control panel
Hardwired stop info Hardwired stop
system Stop
task
Stop signal Energ. stop solenoid 1 Stop solenoid
Stop override info Stop

Emergency stop info

Energ. stop solenoid 2 Stop solenoid
Stop
De-en. stop solenoid Stop solenoid
Stop
HW Remote stop
RS-485 (Modbus)

Emergency Stop
Stop Override
"Bus stop"

Stop Stop Control panel Stop Emergency

Override Stop

EXTERNAL SYSTEM

*MK 070303A9623

There are some important properties to be noticed in the stop

system of th e WECS:
• Th e em ergency st op signa l isn ’t blocked by t h e stop over r ide
sign al
• Th e stop over r ide an d th e emer gen cy st op s ign a ls ar e con-
n ect ed via t h e Relay Modu le t o t h e MCU,
The stop sequ en ce of th e MCU is shown on F ig 7-6.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

7XSTWIUYIRGI

1 ENGINE IN RUN MODE

STOP ORDER

2 C STOP OVERRIDE

YES NO

3 S RETURN TO RUN MODE 4 C STOP OR SHUTDOWN

STOP SHUTDOWN

7 S INDICATE SOURCE

=1

5 S ACTIVATE STOP SOLENOIDS 8 S ACTIVATE STOP SOLENOIDS

S ALARM BLOCKING ON S ALARM BLOCKING ON

S OPERATE 300 RPM RELAY S OPERATE 300 RPM RELAY

S FUEL LIMITER ON S FUEL LIMITER ON

S STOP HOUR COUNTER S STOP HOUR COUNTER

WAIT FOR RESET

9 S RESET GIVEN?

60 S / X5 YES NO

6 S STOP MODE

*MK 0703E 9634

 7XEVXFPSGOMRKW
A start blocking is n or mally caused by the following con ditions on
a marin e engine:
• low prelu br ica tin g oil pressu re,
• t u rn in g gea r en ga ged,
• local/r emot e swit ch in local pos it ion.
On a standard station ary (power plant) engine th er e are in
addition start blockin gs for the following conditions (these are all
configur able, i.e. they may vary dependin g on the installation ):
• engin e n ot pr eh eat ed (low H T wat er tem per atu r e, en gin e
ou t let ),
• low fu el oil pr essu r e,
• low sta rt ing a ir pres su re.


  *YRGXMSREPHIWGVMTXMSR  ;)'7

If the start blocking is active, it is impossible to perfor m a start of

the engine. On th e Modbus an alarm is given for each star t
blockin g being active. Start blockings are skipped in case of a
black ou t star t.

 7LYXHS[RW
Shu tdowns can be cau sed by many conditions on the engine. Th e
shu tdown con ditions vary depending on the type of engine and
the type of installation. F or example the followin g condition s can
be fou nd on an engine:
• low lu br ica tin g oil pres su re,
• h igh coolin g wat er t emper at ur e,
• h igh cha r ge air t emper at ur e,
• h igh ma in bear ing t emper at ur e,
• h igh exh au st ga s tem per atu r e,
• h igh cylin der liner temper at ur e,
• en gine overspeed.
These conditions will in itiate an immediate shutdown of th e
engine, by means of en er gizing two solen oid valves (or de-en er-
gizin g one of th e solenoid valves) on th e engine. One valve is
directly affecting th e fuel pumps of th e en gin e and th e oth er on e
is attach ed to the speed governor. The sensor s used for sh utdown
are of an alogue type, and the shu tdown levels are defined in th e
WECS software. The sh utdown conn ection of th e WECS is shown
in F ig 7-7.
The shutdown is latch ing, and a shutdown reset h as to be given
before it is possible to re-start th e en gin e. Natur ally, before this,
the reason of th e failure must be in vestigated. In case of a
shu tdown, the r eason of the sh utdown will be indicated on th e
commun ication bu s to th e exter nal systems.
Some sh utdown function s of the WECS are backed u p in th e
Relay Module, wh ich is an independen t h ardwired system. These
function s are:
• low lu br ica tin g oil pres su re,
• over speed tr ip,
• option al sh u tdown s witch .


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

8LIWLYXHS[RGSRRIGXMSRSJXLI;)'7

Local shutdown indication ENGINE

MCU MOUNTED
EQUIPMENT
Safety RELAY MODULE
system
task Shutdown
block Control panel
Shutdown reset info HW shutdown reset
Reset
Optional shutdown info Optional shutdown sw.
Lube oil pressure info Lube oil pressure switch
Overspeed shutdown info Backup speed pick-up

Shutdown Energ. stop solenoid 1

conditions MCU watchdog JP2 Stop solenoid
Stop signal Energ. stop solenoid 2
Stop solenoid
Stop override info
De-en. stop solenoid
Stop solenoid
Remote shutdown ind.
Remote shutd. reset
External shutdown
RS-485 (Modbus)

Shutdown info
Stop override
"Bus Reset"

Reset
Shutdown Control panel Stop Shutdown
override

EXTERNAL SYSTEM

*MK 080203A9623

Also th e emergency stop button is con nected to th is Relay Modu le.

Th e Relay Module is moun ted in the MCU cabinet of the engine.
The lu bricatin g oil pressur e shu tdown is in itiated by a separate
pressu re switch. This sh utdown is su ppr essed by an en gin e speed
dependent fun ction. A blocking is accomplish ed at low engine
speed or at a stand-still.
The Relay Module is using a separ ate speed sensor (proximity
switch) for gen er ating an overspeed trip. The tr ip level is set
sligh tly high er th an the level in the WECS configuration, an d the
fu nction is latching. The reset button connected to the Relay
Module mu st be pressed before r e-star t.
The shutdown in dication an d the shu tdown reset is con nected
to the MCU and will not reset a sh utdown initiated from the Relay
Module. If the shutdown has been initiated fr om the Relay Module
it will requir e that the operator r esets the WECS by pressing the
local reset button connected to th e Relay Modu le.


  *YRGXMSREPHIWGVMTXMSR  ;)'7

 4S[IVVIHYGXMSR
Especially on marine pr ojects it is normal th at on ly few measu re-
ment poin ts are configu red to cau se a sh utdown . On the oth er
h and many points will cau se a power r eduction request in an
abn ormal situation. P ower redu ction limit an d condition are
freely con figur able. P ower reduction request is sent to th e exter-
n al control system eith er via har dwir ed conn nection or via Mod-
bu s serial lin k. The extern al contr ol system or the power
managemen t system reduces the load demand as defined on th at
system.

 (EXEEGUYMWMXMSR
In the WECS the data acqu isition is distributed. This mean s th at
sensor s are conn ected to Distribution U nits (SMU’s or DCU ’s)
that are located close to groups of sensor s. On ly star t and stop
related switches are conn ected to the MCU. Backup sensors are
conn ected to th e Relay Module, see F ig 7-8. More information
about MCU and Relay Module conn ection s is r epresented in
section 4.2.
The distributed data acquisition has many advantages compared
to a cen tr alized system:
• less cablin g,
• n oise im mu n it y becau se of digit al commu n ica tion ,
• flexibilit y,
• ea sy to cu st omize for va riou s en gine t ypes.
In th e WECS measur ed values are transferr ed in analog mode
only from the sensor to the DCU /SMU. After th at the values are
in digital mode. Var ious types of commun ication stan dards and
protocols are used, see Fig 7-8. Example layouts and other impor-
tant information abou t conn ection topologies is represented in
section 4.2.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

7IRWSVGSRRIGXMSRTVMRGMTPIMRXLI;)'7

LDU

External
Control
System

RS-232C Modbus
digital digital
link link
RM MCU
SHUTDOWN RESET
STOP/SHUTDOWN OVERRIDE
ECU WATCHDOG
EMERGENCY STOP
OVERSPEED SHUTDOWN
HARDWIRED STOP
ECU STOP/SHUTDOWN
OPTIONAL SHUTDOWN
LUBE OIL SHUTDOWN BLOCKING
LUBE OIL SHUTDOWN
ENERGIZED STOP SOLENOID FAILURE
OPTIONAL SHUTDOWN SWITCH FAILURE
LUBE OIL SHUTDOWN SWITCH FAILURE

CAN DCU RS-485 SMU

SPEED SWITCH 2
SPEED SWITCH 1
FAILURE ALARM
SLOW TURNING
FUEL LIMITER
ECU START
HARDWIRED START
HARDWIRED START BLOCKING
STOP RELAY

digital digital
link link
VAISALA
POWER

STATUS
CAN

FLASH RESET
VAISALA
U1
U2
MODULE
RELAY

U3
U4
U5 BACKUP

Analog
signals
mA, V, f
etc.
backup switches sensors/ sensors/
sensors/ switches switches
switches

*MK 080204A9623

The data h an dling procedure in th e WECS is shown in Fig 7-9.

Th e sen sor value is normally measured by the I/O section of the
SMU Boar d. F iltering, lin ear ization and err or ch eck operations
are made to the data an d th en it is tr ansferred to a DCU Board.
Th e DCU software verifies the validity of th e measu red data and
checks the valu e again st alarm, power r eduction and shutdown
limits. After th ese operations th e data is saved to the database of
the DCU. Then the data is immediately transferr ed via CAN to
the MCU. The data r eceiving softwar e in th e MCU distributes the
data to the Modbus an d to the database of the MCU . The data
saved to the database of the DCU or th e MCU can be used by
several application modu les (like Math , LDU, etc.). These mod-
ules read values from the database and , in some cases, save
produ ced values to th e database. Data can also be transfer red
from the MCU database to the Modbu s.


  *YRGXMSREPHIWGVMTXMSR  ;)'7

(EXELERHPMRKTVSGIHYVI

SMU Board DCU Board MCU

- Measuring Measurement I/O
- Filtering - validity check
serial
- Linearization - alarm check
- Error check - power reduct. check Measurement
- shutdown check

I/O CAN
Database Database

WEnCoM LDU Modbus Hour LDU

Math Scale Safety Math

serial

Modbus master

*MK 0704A9623

('9719
In the WECS sensors are n ormally connected to DCU /SMU’s. Th e
DCU in cludes the same sensor con nections as th e SMU, but an
additional P CB for CAN communication an d data processin g.
Only two types of Distribu tion Units are needed because their
measurin g ch annels are multiusage type. Var ious types of sen-
sors can be con nected to these chann els:
• 4-20 m A cu r r en t loop,
• cur r en t tr a nsdu cer ,
• volta ge tr an sdu cer,
• P t-100,
• th er mocou ples of type J , K, S a nd T,
• r esista n t,
• poten t iometer,
• switch (m ax. 2 way).
Ever y measu ring chan nel has an option to supply voltage for th e
sensor conn ected to it. Eigh t ch annels (0-7) supply either 12 V DC
or 15 V DC an d two chann els (8-9) supply 5 V DC.
There are also eight (8) digital inputs in th e DCU/SMU’s.
Selector s are recommen ded to be con nected to these inputs (see
Appendix B). F or the speed measurin g th er e ar e two (2) frequ en cy
in puts in the DCU /SMU.
The measu ring frequency of digital inputs an d measurin g chan-
n els may var y, but in most cases it is 1 H z. The frequ en cy
measuremen ts are made with 10 H z frequency, except for th e
engine speed measur ement used for overspeed detection that is
made with 62.5 Hz frequ en cy.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

 -RWXVYQIRXEXMSR
Th e instrumentation con nected to the WECS depen ds on engine
type and in stallation . In this section all the in str umen tation
option s are described in th eir own sections.

 0SGEP(MWTPE]9RMX
Th e Local Display Unit (LDU ) r eplaces the tradition al pr essure
gauge pan el, the thermometers and other in stru men ts.
It is connected to the P rocessor Board of the MCU or to the
RS-232C port of th e DCU. These u nits sen d the necessary data to
the LDU. Th e software of the LDU is possible to use as it is on a
normal P C, i.e. if th e LDU is not included in the WECS it is
possible to get exactly th e same information to a P C con nected to
the serial port reserved for th e LDU. Th e updatin g frequency of
all data (on th e active page) follows the updating frequency of the
database.
The operator is able to give all n ecessary commands with the
four bu tton s existing on the LDU frame. If a P C is used instead
of th e LDU the same keys on the PC keyboard are u sed. The
followin g button s exist:
• Asterisk (*) key ,
• U p ar r ow (↑) k ey,
• Down ar row (↓)key
• E N TER (↵) key.
Th e F ig 7-10 shows the button s on th e LDU frame. The Up and
Down arrow keys ar e used for changin g pages.The LDU can be
resetted by pressing both Asterisk and EN TER keys simu ltane-
ou sly for some seconds. After r eset th e LDU is blan k about 30
seconds an d starts then u ploadin g th e con figuration . The loading
is not succeeding, if page with text Waitin g for parameters is
sh own.
A screen saver r educes intensity of the LDU, if no operator
actions h ave been made for some minutes. The intensity is maxi-
mized again by pressin g any of the LDU control bu ttons. The LDU
retu rns automatically to the meter page, if n o oper ator actions
have been made for 15 minutes.


  *YRGXMSREPHIWGVMTXMSR  ;)'7

'SRXVSPFYXXSRWSJXLI0(9

*MK 0803039503

On the upper r igh t cor ner of the LDU there is a rotating indicator
showin g th at the LDU is r eceiving data. No data is received, when
the indicator is stopped.
The values sh own on th e LDU ar e inverted, if they ar e not
n ormal, i.e. th e value is at old, default, shu tdown, power reduction
or alarm condition or the LDU is not receiving data. Once the data
flow to the LDU has been stopped, it can be refreshed by pressing
Up or Down arrow keys.
The display consists of thr ee different kin ds of pages: the meter
page, the history page and th e status pages. These page types are
described in the following sections.
 1IXIVTEKI
The display ar ea is divided in to thr ee differ ent sub windows: th e
fixed meter win dow, the ch angeable meter window (in software
ver sion 1.0 fixed) an d the message window. F ig 7-11 shows th e
location of each window.
*M\IH1IXIV;MRHS[
Th is window is at th e upper par t of th e display area an d is always
visible. It contains th ree important parameters of the en gin e:
• th e en gine s peed,
• th e load ba lan ce of t h e cylinder s,
• th e fu el r a ck pos it ion.
The load balance of th e cylin ders is sh own as the temperatu re
deviation for each cylinder from the average temperature of all
cylin ders.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

7YF[MRHS[WSJXLI0(9

Fixed meter
window
ENGINE SPEED FUEL RACK

FUEL OIL INLET LUBE OIL INLET HT-WATER INLET LT-WATER INLET CHARGE AIR
Changeable
meter window

FUEL OIL INLET LUBE OIL INLET HT-WATER OUTLET LT-WATER INLET CHARGE AIR
Message
window ENGINE RUNNING

*MK 080205C9503

'LERKIEFPI1IXIV;MRHS[
Th is window is in th e middle of the display. It contains sever al
meters. Th e ch angeable window is the on ly one ch anging when
moving to th e next or to th e previou s meter page. (In software
versions 1.0 an d 1.1 there will be only one meter page.)
1IWWEKI;MRHS[
Th is window is the bottom part of the display area. The win dow
contains the status of the en gin e.
 ,MWXSV]TEKI
Th e statu s message page sh ows the latest even ts of th e engine.
Th e MCU date an d time is shown on the left en d of each row. After
that there is the message itself like --- ENGINE BEIN G
STARTED ---. In the case of sh utdown the sen sor code is also
prin ted ou t. The event queue is clear ed at MCU r eset. On e status
message page with fictional messages is sh own in F ig 7-12.

2SXI 1'9MRXIVREPHEXIERHXMQIMWWIXXS[LIR
VIWIXXMRKXLI1'9


  *YRGXMSREPHIWGVMTXMSR  ;)'7

,MWXSV]TEKI

HISTORY PAGE --

1990-01-01 0:11:25 --- ENGINE BEING STARTED ---

1990-01-01 4:21:37 IMMEDIATE SHUTDOWN: H722 = 0.0 (limit = 64.0)
1990-01-01 4:21:37 --- ENGINE BEING SHUT DOWN ---
1990-01-0112:34:06 --- ENGINE BEING STARTED ---
1990-01-01 20:32:11 IMMEDIATE SHUTDOWN: H722 = 0.0 (limit = 64.0)
1990-01-01 20:32:11 --- ENGINE BEING SHUT DOWN ---
1990-01-01 23:01:05 --- ENGINE BEING STARTED ---
1990-01-02 8:56:48 IMMEDIATE SHUTDOWN: H722 = 0.0 (limit = 64.0)
1990-01-02 8:56:48 --- ENGINE BEING SHUT DOWN ---
1990-01-02 9:25:59 --- ENGINE BEING STARTED ---

*MK 0706C9634

 7XEXYWTEKIW
One status page shows all connections (inclu din g the internal
enclosur e temperature) to one unit or values of a logical sensor
group like main bear ing temperatures. The conn ection s to th e
MCU are also sh own on statu s pages. Th e number of the pages
will be accor din g to the WECS bu ild-up.
All DCU s h ave an LDU configu ration with status pages. There
is on e status page per un it (e.g. DCU1, SMU1-2,..) and on e page
for SMU Board ser ial n umber s and DCU softwar e version.
The status colu mn is blank if the value is normal. The following
status letter s can be shown , if the value is n ot normal:
• O = Old
• D = Defau lt
• M = P ower r edu ction
• S = S hu t down
• A = Alar m
The valu e text is inverted when the valu e is not normal. An err or
code with explaining text is shown , when the sen sor is not
measured corr ectly. One status page with fictional sensors and
values is shown in F ig 7-13.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

7XEXYWTEKISJXLI0(9

SMU3-3
Terminals Sensor Sensor Status Value
code type
1..4 PT201 4-20mA 4,5 bar
5..8 PT311 4-20mA 9,1 bar
9..12 PT401 4-20mA 3,5 bar
13..16 PT451 4-20mA 2,8 bar
17..20 LS204 Switch 0
35..38 TE402 Pt100 95 C
39..42 TE451 Pt100 65 C
43..46 TE452 Pt100 _O____A -905 Sensor Sh
47..50 TE201 Pt100 75 C
51..54 TE622 Pt100 69 C

*MK 3223969601

Terminals, Sensor code an d Sensor type colu mn s can be re-

placed with Sensor names column by pressing the asterisk key.
A status page with sensor names is shown in F ig 7-14. The origin al
layout of the status page is return ed by pressin g th e Asterisk key
again .

7XEXYWTEKI[MXLWIRWSVREQIW

SMU3-3 --
Sensor names Status Value

Lube oil pressure, inlet 4,5 bar

Control air pressure 9,1 bar
HT water pressure, inlet 3,5 bar
LT water pressure, inlet 2,8 bar
Lube oil level (0=OK) 0
HT water temp., outlet 95 C
LT water temp., inlet 65 C
LT water temp., outlet _O____A -905 Sensor Short Error
Lube oil temp., inlet 75 C
Charge air temp., CAC outlet 69 C

*MK 3223979601


  *YRGXMSREPHIWGVMTXMSR  ;)'7

 'SRXVSPW
The main control fun ctions are in clu ded in the contr ol panel. Th e
function s and layout of the contr ol panel may vary depending on
engine type. The possible fun ctions ar e mode of start, star t, stop,
shu tdown reset an d speed selector, which are described more
detailed below.
1SHISJWXEVX
There are two startin g modes, local and r emote. In local mode th e
start cannot be executed from th e control room. H owever, it is still
possible to star t the engine locally from the control panel.
7XEVX
The start button is used to star t the engine locally.
7XST
The stop button is used to stop th e en gin e locally.
7LYXHS[RVIWIX
After an au tomatic shu tdown the contr ol system is to be r esetted
before the engine can be started again. Th is is due to safety
requirements. A blu e light in the r eset button in dicates an auto-
matic sh utdown , after reset the ligh t turns off.
7TIIHWIPIGXSV
The switch is used to indicate eith er the engine speed or th e
tur bocharger speed on the tach ometer .

 'SRXVSPSJ08XLIVQSWXEX STXMSREP

The LT-water thermostat can be con trolled by the WECS. Th e
LT-thermostat control is basically a PID-r egulator fun ction, and
the regu lator sets the position of the th er mostatic valve by mean s
of controlling a DC-motor in a linear actuator. Th is actuator is
attach ed to the body of the thermostatic valve.
The DC-motor provides a linear motion of the thermostatic
valve. The fu nction is adjustin g the temper atu re, by rotating th e
DC-motor either in on e or th e oth er direction (by ch anging polar-
ity of the motors supply voltage). When the cor rect temperatu re
is achieved, the supply voltage to the motor is cu t off.
A feedback signal is taken from a P t-100 temper ature sensor
measurin g the in let water temperatur e to the th er mostat. There
is also a position feedback potentiometer in th e actuator . Th e
temperature set by this system is dependen t on the engine load.
The function will adjust the temperature of th e LT-water ac-
cording to Fig 7-16.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

0SEHXIQTIVEXYVIVIPEXMSRJSVXLI08[EXIVGSRXVSPZEPZI

Temp.

th

tl

bl bh Load

*MK 080206A9503

Th e function maintain s a r elatively high temperature of the

LT-water on low load. In the mid-load ran ge th e temperature will
smooth ly r amp down (at incr easin g load), while th e temper ature
in the h igh -load r ange will be maintained at a relatively low
temperatu re.
The poin ts tl, th, bl, bh as well as oth er parameters are adjust-
able.

 ;)R'S1JYRGXMSRW STXMSREP

 &EGOKVSYRH
Th e or iginal WEnCoM was developed by Wärtsilä Diesel in the
ear ly 80’s and comprised a micr oprocessor based temper ature
measuring system designed for condition mon itor ing of diesel
en gin es. Th e temper atures of th e cylinder lin er s, the main bear-
ings and th e exhau st gas valves were measured with thermocou-
ples, presen ted on a CRT-screen or printer as tables or ch arts and
stored in a separate memory cassette. Th e system also performed
certain mathematical operations of the data. When the alarm
levels were reached, th e system generated alar ms or shutdown
signals for the engine.
Today WEn CoM is divided into two parts: the safety fun ctions
included in th e WECS and th e trend diagrams implemen ted in
the exter nal system. The external system in this meaning is any
control, alar m or monitoring system conn ected to the WECS. The
temperatu re measuring of the cylin der liner s, main bearings and
the exhaust gas valves, the ch ecking again st alar m, power redu c-
tion an d shutdown levels an d the n eeded mathematical opera-


  *YRGXMSREPHIWGVMTXMSR  ;)'7

tions are all included in th e WECS. The presen tation s of all

measured an d calcu lated data sh ou ld be implemented, according
to the r ecommendation s, in the exter nal system conn ected to th e
MCU . Depen din g on engine type and size the amoun t of sensor s
in clu ded for the WEn CoM-function s may vary.

 ']PMRHIVPMRIVW
The cylinder liner temperature reveals not on ly the condition of the
liner, but also those of the piston and the piston rin gs, see F ig 7-17.
The cylin der liner temperatur e is measu red with two or three
sensor s dependin g on engine type. Alarm, power r eduction or
shu tdown is gen er ated if th e valu e exceeds specified limits. Th e
u pdatin g frequency is 1 Hz.

8IQTIVEXYVIWIRWSVWMRXLIG]PMRHIVPMRIV

*MK 080209A9503

It is r ecommended to have trend diagrams of th e cylin der lin er

temperatures in the external system.

 1EMRFIEVMRKW
The temper atu re of the main bearin g is monitored with th e sensor
in dir ect con tact with the bear ing shell, see Fig 7-18. Alarm, power
redu ction or shu tdown is gen er ated if th e value exceeds specified
limits. The updating frequ en cy is 1 H z.


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

8IQTIVEXYVIWIRWSVWSJXLIQEMRFIEVMRK

*MK 080209B9503

It is recommended to have tr en d diagrams of the main bearing

temperatu res in the extern al system.

 )\LEYWXKEWZEPZIW
Th e con dition of the exhau st gas valve is mon itor ed with a sensor
measuring the exhaust gas temperature behind th e exhau st gas
valve, see Fig 7-19. A burn ed spot on th e valve disc will, in time,
resu lt in an in creasing temper ature fluctu ation because of the
rotation of the valves. A malfunction ing valve can be discovered
by analysing th e cyclic variations in exhau st gas temperatures.
Th e exhaust gas temperatures are analysed by performing F FT
and statistical evaluation s of the temperature values.

)\LEYWXKEWXIQTIVEXYVIWIRWSV

*MK 080209C9503


  *YRGXMSREPHIWGVMTXMSR  ;)'7

Each cylin der h ead is fitted with two exhaust gas temperatu re
sensor s; on e for each exhau st valve.
A F ast Fourier Tr ansformation (F FT) is calcu lated at 1/(2 x
cylin ders/DCU) H z frequency. Thus, if there is a DCU calculating
the values for one bank of an 18V engine, i.e. nin e cylinder s/DCU,
the updating fr equ en cy is 1/18 Hz. Th e nu mber of samples u sed
for the calculation is 64 and th e samples are taken on ce a secon d.
A root mean squ are (RMS) value is calcu lated of the amplitu des
within th e frequency win dow 0.055 to 0.25 H z. An alar m is
gen er ated if the RMS value exceeds a given alarm limit.
The following statistical evaluations are made. Alarm, power
redu ction or shu tdown is gen er ated if th e value exceeds specified
limits.
• Avera ge va lue, to expr ess th e exh au st ga s tem per a tu r e of
each cylinder , of th e two cylinder head t emper a tu re sen sor s
is ca lcu lated with an updat ing fr equ en cy of 1 H z,
• Avera ge valu e of all exha u st gas t emper a tu re s en sor s is
calcu lat ed with an u pda tin g fr equ en cy of 1 H z,
• Th e devia tion s between th e aver a ge of ea ch cylinder an d th e
aver a ge of all cylinder s (en gin e aver a ge) ar e calcu lat ed wit h
an u pda tin g fr equ en cy of 1 H z,
• Th e difference between th e a vera ge of th e las t 64 s am ples of
valve C an d valve D is ca lcu lated with a n u pdatin g frequ en cy
of 1/(2 x cylin der s/DCU) H z.
The followin g measur ed and calculated values are gen er ated for
each cylin der as separate data an d are r ecommended to be u sed
in the external system for trend diagrams:
• Exh a us t gas va lve 1 t emper a tu re,
• Exh a us t gas va lve 2 t emper a tu re,
• Exh a us t ga s tem per atu r e (calcu la ted a ver age of valve 1 a n d
2),
• Exh a us t gas t emper at ur e deviat ion fr om en gine a ver age,
• Exh a us t gas va lve 1 RMS,
• Exh a us t gas va lve 2 RMS,
• Exh a us t gas va lves t emper at u re differ en ce.

 7PS[XYVRMRK STXMSREP

F or larger en gin es th e starting fu nction is divided in to two par ts:
slow tur ning and startin g. When star ting, a separate slow turning
solen oid an d the master star t solenoid are activated and th e
engine is turned slowly two revolu tions. Th ere can be a con figur-
able delay between slow tu rning solenoid and start solenoid
activation. If the slow tu rning was successful, only the master
starting valve is activated and the diesel engine acceler ates to th e
speed set by th e govern or control system. If the en gin e recen tly


 ;)'7 *YRGXMSREPHIWGVMTXMSR  

has been in u se (within 30 minu tes) the en gin e will immediately

start without slow tu rning.
When slow tur ning is r equ ested thr ee outpu ts are activated:
• S low tu r n in g sign al
• S tar t s ign al
• S top signa l (t o pr even t fu el inject ion).
Th e slow turn ing is successfu l if th e engine h as tur ned a con fig-
urable amount of revolution s (e.g. 2) within configu red time (e.g.
15 secon ds). If not, th e slow tur nin g is stopped an d slow turn ing
failure alarm is indicated. The configured time between start
attempts (usually 20 secon ds) mu st be waited before next start
attempt. As soon as the engine has tu rned two r evolutions (within
configur ed time) the MCU will switch over to the n or mal start
procedur e.
If the en gin e has been in use (slow tur ning or r unn ing) du ring
the last 30 minutes th e engine should immediately star t without
slow turn ing.
If a SLOW TURNING REQUEST is made, th e slow tu rnin g is
done without any attempt to star t. Naturally the normal start
blockings are checked before th e slow tu rning is made.
If the engine is in STANDBY mode the slow tu rnin g is done at
configur able interval.

2SXI -JXLIWXSTPIZIVMWMRWXSTTSWMXMSRXLIIRKMRI[MPPFIMR7834
QSHIRSXMR78%2(&=QSHI


  *YRGXMSREPHIWGVMTXMSR  ;)'7