Impressed Current System ICCP Instruction Manual CCEL Control Unit 100A,ADS-1, IP44, Rev 01

Impressed Current System (ICCP) (ICCP) Instruction Manual Ship: Yard: Hellesøy Verft Yard No.: 150

Instruction Manual ICCP System, BN 150, Hellesøy Verft

TABLE OF CONTENTS 1.

INTRODUCTION .......................................................................................... .................................................. 3

1.1 1.2 1.3

GENERAL .................................................. ........................................................... ........................................ 3 CORROSION AND CATHODIC PROTECTION ......................................................................................... .......... 3 IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM .............................................................................. 3

2.

PROPELLER SHAFT ................................................................ ............................................................ .......... 4

3.

RUDDER BONDING ............................................................................. .......................................................... 4

4.

SYSTEM OPERATION .......................................................... ............................................................... .......... 4

5.

CONTROL UNIT OPERATION ......................................................... ........................................................... 5

5.1 CONSTRUCTION ......................................................................................... .................................................. 5 5.2 I NTERFACE PANEL ............................................................................................... ........................................ 5 5.3 OPERATION......................................................... ........................................................... .............................. 5 5.3.1 Main picture ......................................................... .................................................................... .......... 5 5.3.2 Alarm limits ...................................................... .............................................................. .................... 6 5.3.3 Regulation Mode ........................................................... ..................................................................... 6 5.3.4 Set Point ........................................................................ ........................................................... .......... 6 5.3.5 Manual Current.............................................................. .......................................................... .......... 7 5.3.6 Miscellaneous........................................................................ ............................................................. 7 6.

TROUBLE SHOOTING ............................................................................................ ...................................... 8


1.

INTRODUCTION

1.1

General

The purpose of the installed impressed current cathodic protection (ICCP) system is to prevent corrosion on the external surfaces of the ship’s underwater hull. The system will have no, or only limited effect on shielded areas as water inlets, sea chests, thruster tunnels, rope guard, etc.

1.2

Corrosion and Cathodic Protection

On metal surfaces submerged in seawater different local electrical voltages (anode-cathode cell) will exist. This involves a current flow resulting corrosion on the areas where the current dissipates (anodic area) and protection of the areas where the current enters the metal surface (cathodic area). The principle of cathodic protection is to make the area to be protected a cathode. The anodic reaction takes place at the anodes. Current is supplied from a control unit via the anodes, through the seawater and into the hull surface. The current is flowing in the less resistance path, hence, it will flow to the surfaces with


2.

PROPELLER SHAFT

Due to a potential difference between the propeller and the hull special shaft bonding equipment is recommended to be installed to avoid spark corrosion in bearings. An installed shaft slipring arrangement will reduce the potential difference between the shaft and the hull and the current will flow through the brushes rather than through the bearings. It is recommended that the potential difference between the shaft and the hull is kept lower than 75 mV.

3.

RUDDER BONDING

In order to include the rudder in the protection by the impressed current system a bonding cable should be connected between the rudder stock and the hull. This bonding will also reduce the risk of current flowing through the bearings creating spark corrosion. Rudder flaps shall always be equipped with sacrificial anodes.

4.

SYSTEM OPERATION

When a good and dense paint system is applied (for new building or after dry-docking) the


5.

CONTROL UNIT OPERATION

5.1

Construction

The CCEL control units are in principle built up by the following main components: 1. Transformer 2. Rectifier bridge 3. Control circuit board with display The input and output terminal blocks are situated in the top of the cabinet and marked with terminal numbers and declarative text.

5.2

Interface Panel

The control unit controller module is equipped with push-buttons for navigating the menu tree: ENT (ENTER), ,  and ESC. The arrow keys are used to move up and down in the menu listing, adjust limits and select options. The ENTER-key is used to go one level into the menu system and to confirm changes made to limits and settings. The ESC-key takes you one level up in the menu listing. It is also used to cancel any changes made to limits or settings. To get back


5.3.2

Alarm limits

The system is equipped with alarm for underprotection (HI limit) and overprotection (LO limit). The values should normally be set to: 

HI Limit: 350 mV



LO limit -150 mV

It is also possible to connect up to four shaft potential measurements to the control unit. High and low alarms for these potentials together with an upper temperature alarm is possible to set in this menu.

5.3.3

Regulation Mode

The system is normally set up for automatic regulation according to the highest of the reference potential readings from the installed reference electrodes.


5.3.5

Manual Current

If manual regulation mode is selected the current output will be according to setting made for manual current under the menu “Mode settings”. This is only recommended if both reference electrodes for any reason are not functioning.

5.3.6

Miscellaneous

In the above we have only described the menus normally required for the operation of the system. Other settings can be made, however, these are mainly for service personnel. Attachment A shows all menus and how to navigate make adjustments.


6.

TROUBLE SHOOTING

6.1

Display reading

Minor fluctuation in the control unit display reading may occur at low current requirement. However, this will not have any negative effect on the cathodic protection system performance. Possible fluctuation may be caused by the following: Low current requirement. Contamination on the shaft slip ring contact surface. Electrical noise created by other systems being picked up by the reference electrodes and/or cabling.   

6.2

Fault findings

Important safety Even with the front door isolator in “Off” position there are live terminals inside the cabinet.

Whenever the front door is open the front door isolator should be left in “Off” position and the supply to the control unit isolated elsewhere.


7.

RECOMMENDATIONS

7.1

General

In order to secure continuous proper operation it is recommended that the ICCP system is being serviced by an Cathwell service engineer at dry-dockings.

7.2

Log Readings

In order to ensure continuous proper operation of the ICCP system a log sheet has been prepared for system operation data completion. Completed log sheets are recommended dispatched to Cathwell for evaluation and comments.

7.3

Dry-docking

It is recommended to switch off the ICCP system approximately 1 week prior to dry-docking in order to dissolve the build up salt deposit.


8.

APPENDICES 1. Display screens a. Main display screen b. Setting display screens 2. Drawings a. 1905-MIA, ICCP System Arrangement, NB 150, Hellesøy Verft b. 1045-MIA, Disc anode type ADS-1, Arrangement drawing c. 1044-MIA, Zinc reference electrode type RSH, Arrangement drawing d. 1979-MID-01, ICCP control unit cabinet type 24/100-CCEL IP44 e. 1979-MID-02, ICCP control unit interface diagram type 24/100-CCEL IP44 3. Control Unit Data Sheet 4. Standard log sheet


APPENDIX 1


Main Display Screens

Display 1 ( ↓-key to next) Time Output Vdc Current shunt

Date ##.# V ### A

CS1: ## A CS3: ## A CS5: ## A T1: ## C

CS2: ## A CS4: ## A CS6: ## A T2: ## C

Display 2 (↓-key to next) Ref cell 1: Ref cell 2: Ref cell 3: Ref cell 4: Shafts S1: ### mV S1: ### mV

### mV ### mV ### mV ### mV S2: S2:

### mV ### mV

Display 3 (↓-key to next) Alarms

CW

V#.##

## Hz

## Hz

Note CW could display as CCW counter clockwise phase rotation


Setting Display Screens

Alarm limits (↓-key to next) Enter >R1 Upper mV 350 Enter Highlighted to desired ↑ ↓ value Enter

Overcurrent (↓-key to next) Enter >Shunt Max A 1000 Enter Highlighted to desired ↑ ↓ value Enter

↓

↓

R1 R1 R2 R2 R3 R3 R4 R4 Shaft 1 Shaft 1 Shaft 2 Shaft 2 Shaft 3 Shaft 3 Y Shaft 4 Temp. Esc Esc

Upper Lower Upper Lower Upper Lower Upper Lower Upper Lower Upper Lower Upper Lower

mV mV mV mV mV mV mV mV mV mV mV mV mV mV

350 -100 350 -100 350 -100 350 -100 75 -5 75 -5 75 -5

Lower Upper

mV C

-5 100

C.S.1 C.S.2 C.S.3 C.S.4 C.S.5 C.S.6 Esc Esc

Max Max Max Max Max Max

A A A A A A

1000 1000 1000 1000 1000 1000

Mode Settings (↓-key to next) Enter >Operating mode Enter Slave Current Ref. Cell * Test Mode Esc ↓

Manual current Set potential Fan start temp Alarm alert slow FW trip current FW voltage FW Timer FW enabled Esc Esc

A mV C A V h

## 140 60 N 500 23 24 N

System Settings (↓-key to next) Enter >Set time/date Enter >Hours hr Enter Highlighted to desired ↑ ↓ value Enter Minutes min Date dd Month mm Year yy Esc ↓

3 Phase System Hourly logging Shunt rating C.S.1 rating C.S.2 rating C.S.3 rating C.S.4 rating C.S.5 rating C.S.6 rating Voltage Max Shunt voltage Enter 75 mV 60 mV Esc

A A A A A A A %

Shunt Shunt

Y/N N 300 150 150 150 150 150 150 100

*

↓

Shunt/sensor select Enter Shunt Current sensor Esc Write SD settings Enter Read SD settings Enter Write SD offsets Enter Read SD offsets Enter

*

Esc Fitted Options (↓-key to next) Enter >Ref 1 Enabled Y Enter Enabled N Enter Enabled Y ↓

Ref Ref Ref Shaft Shaft Shaft Shaft C.S. C.S. C.S. C.S. C.S. C.S. Therm Therm Esc Esc

2 3 4 1 2 3 4 1 2 3 4 5 6 1 2

Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled

Y N N N N N N Y Y N N N N Y Y


APPENDIX 2







APPENDIX 3



APPENDIX 4


Impressed Current System ICCP Instruction Manual CCEL Control Unit 100A,ADS-1, IP44, Rev 01

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