Control Positions

Question 1

Control of P & D

Answer 1

Control of P&D is done from two positions:
•Primary Control Position (PCP)
•Secondary Control Position (SCP)

•On the older ships this may be done from the Machinery Control Room (MCR) or the main switchboard (Main SW/BD).

Question 2

PCP -Primary Control Position

Answer 2

•Primary control positions is located in Ship’s Control Centre.
PCP shows:
- Plan of whole electrical distribution system up to the EDC.
- States of all breakers and generators.

Question 3

PCP Control positions

Answer 3

PCP Controls/ operates:

• All main breakers
• All generator voltages
• All generator frequencies
• Anti-condensation heaters in switchboard.

Question 4

SCP Secondary control position

Answer 4

•Secondary control position is located in machinery sections.
SCP shows:
-Plan of electrical distribution system fed from the section
-State of all breakers and generators controlled by the section.

Question 5

SCP Operations

Answer 5

•SCP controls/operates:

• Breakers controlled by section switchboard.
• Voltages of generators controlled by section switchboard.
• Frequency of generators controlled by section switchboard.
• Anti-condensation heaters in switchboard.

Question 6

Control positions

Switchboards

Answer 6

•Switchboards primarily for generator indication and control.
•Switchboards also control distribution of power:
-ship generated
-shore supply/ship alongside.
•Accordingly there are a number of meters, controls and indicators.

Question 7

Control positions:

6 Meters

Answer 7

• Voltmeter
• Frequency meter
• Watt meter
• Ammeter
• Syncroscope
• Earth fault indicator

Question 8

Control positions

Secondary control positions meters

Answer 8

Propulsion motor meters:
•PM watt meter
•PM amp meter.

Question 9

Control positions

Controls

Answer 9

• start/stop switch——diesel start
• selector switch ——select generator voltage of frequency
• control switch——PCP/SCP Control
• Discrepancy switch—— open/close breakers.

Question 10

Indicator lights

Answer 10

• Control available (green)/ Not available (red)
• Generator running (green)
• Fire detected(red)
• Over temperature(yellow)
• Breaker tripped (discrepancy switch illuminates)
• Earth Fault (light indication & audible alarm)