Installation Instructions
22.10.19 Kapitel/Chapter 5: Installation Instructions - Seite/Page 87
5.11 Generator AC system installation
Attention! Before the electrical system is installed, READ the
SAFETY INSTRUCTIONS of this manual FIRST! Be sure
that all electrical installations (including all safety
systems) comply with all required regulations of the
regional authorities. This includes lightening conductor,
personal protection switch etc.
All electrical safety installations have to be made on board.
A power source selector switch must be installed between the generator (or if applicable, AC-Control box)
and the ship's electrical supply system. This switch must used to ensure that all AC consumers can be
switched off at once. This switch should also be installed to keep the generator and shore (grid) power
systems separate.
Fig. 5.11.0-1: 3-Way cam switch3-Way cam switch
A 3-way cam switch should be used. This switch basic
positions: „Shore power“ - „OFF“ - „Generator“. If an (DC-AC)
inverter is used, a fourth position will be required.
0. OFF
I. Generator
II. Shore power connection
III. Inverter
The cam-type switch must have 2 poles, so that „MP“ and „phase“ can be switched off.
If a 3-phase current system is also installed with the option of supplying from either the generator or shore power, an
additional switch must be installed to keep these systems separate.
An alternative to a manual rotating switch is an automatic power relay. When the generator is not running, the relay
remains in the shore power position. As soon as the generator is running, the power relay switches automatically to
the generator position.
Note: If the system has both single and 3-phase AC, it is CRITICAL that the two systems remain SEPARATE!
Protection conductor
The generator is provided with a PEN safety system, as standard, which connects the 3-phase delta centre point „N“
to the safety ground strap.
If a separate ground protection cable is necessary (i.e. due to national safety regulations), the bridge between the
generator housing and ground (in the AC-Control box) must be disconnected. Once such a ground protection cable
is installed, it must be connected to the ground straps of all on board electrical devices.
In order to monitor the electrical system, it is recommended to install a voltmeter (and, if possible, a current meter)
down line from the power source selector switch so that all respective power sources can be monitored. A separate
voltmeter for the generator, itself, is therefore not required.
Electrical fuses
It is absolutely essential that the electrical system installation is inspected by a qualified electrical technician. The
generator should have its own AC input electrical fuses. The fuses should be sized such that the rated current of the
generator on each of the individual phases is not exceeded by more than 25 %.
Data for gensets with power output greater than 30 kW on request!
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