Introduction:
The
document is prepared on the basis of study done in rectifying defects in ACS in
P444 Series of Supper Dovra MK III .
Background:
P444
Series of Super Dvora MK III joined SLN
fleet on 01st April 2010. Currently SLN fleet has 6 no’s of Super Dvoras
.
Name
|
Date
of Join to SLN fleet
|
Location
|
P4442
|
01st
April 2010
|
East
|
P4443
|
18th
July 2010
|
West
|
P4444
|
24th
September 2010
|
East
|
P4445
|
08th
November 2010
|
East
|
P4446
|
16
March 2011
|
East
|
P4447
|
25th
February 2011
|
West
|
P 4445 which joined on 08th
November 2010, developed a defect in steering which non synchronizing of propeller
movement with the wheel moment (Error message popped up as “System encountered
an uncorrectable hardware error”)
ACS defect Summary in 444 Series
Craft
|
Defect
|
Date
|
DTG
|
P442
|
AL-RCL Speed demand defect appear on blue vision system
|
19/06/2010
|
191258
|
Intermittent failure of ACS control System
|
04/04l2011
|
417080411
|
|
ACS Shutdown three times
|
18/08/2011
|
181818
|
|
ACS PC malfunction
|
27/09/2011
|
2618280911
|
|
ACS PC malfunction indicating CAN1 & CAN 2 communication
error
|
09/11/2011
|
913081111
|
|
Malfunction of ACS System
|
27/11/2011
|
2718581111
|
|
ACS System SCC steering card defective
|
10/09/2012
|
101123
|
|
P4443
|
CAN 1 & CAN 2 Error switched to NFU alarm whilst operating at pier
|
16/03/2011
|
1617080311
|
ACS Malfunction with written displays
|
03/11//2011
|
221181111
|
|
ACS Computer Frozen three times during last patrol
|
18/12/2011
|
181518
|
|
Blue-vision malfunction
|
28/02/2012
|
2816580212
|
|
AL GCU =211 A 002 – A 030 Faulty
|
31/10/2012
|
3117581012
|
|
Alarm appearing continuously
i. AL GCU=211+A002-A030 Faulty
ii. AL ECU Error/check error code
iii. AL RCL combined alarm
|
7/12/2012
|
71448
|
|
CAN 1 & CAN 2 communication error indicating continuously in ACS
display and struck in non-follow up
mode
|
21/12/2012
|
212481212
|
|
P4444
|
ACS control System PC restart intermittently
|
25/05/2011
|
2521080511
|
ACS System follow up mode defective
|
08/06/2012
|
815380612
|
|
P445
|
Unable to start STBD M/E
|
23/12/11
|
2316021211
|
ACS Defective
|
21/09/2012
|
212001
|
|
P4446
|
Unable to switch ON ACS computer
|
08/08/2011
|
81520
|
Unable to boot up blue vision system
|
26/04/2012
|
2617010412
|
|
P4447
|
Unable to start ACS computer
|
11/04/2012
|
111638
|
My Experience:
I would like to mention that I have observed the above defect from P
4445 when I was serving as an officer under trainee during the second session of
the sea training. During the period of
training, I observed that error message on ACS System repeatedly and I was instructed
by OIC to investigate the matter. I would like to brief on ACS System with the experience
I gained during this investigation.
Arneson Control System
Introduction
The ACS is an innovative craft/ship
digital steering and trim control system based on the well-known Arneson
Surface Drive (ASD) system. The system uses state of the art hardware and
software technology to implement PID (Proportional Integral Differential)
control algorithm to drive and control the craft propellers.
ACS system structure and block diagram
The
main parts of the ACS system are:
·
Two control panels (which are also uses
as displays)
·
An industrial PC
·
An Adaptors box
·
An SCC (Solenoids Control Card) box
·
Steering wheels
·
Three dual proportional solenoids
·
Four Electronic In Cylinder Transducer
(EICT)
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