Balancing; Installation Condition; Alignment; Electrical Connection - MarelliGenerators MJB 160 Instructions Et Avertissements Pour L'installateur

3.3. Balancing

Unless otherwise indicated the rotor is balanced dynamically with a half-key fitted on the shaft extension, in compliance with IEC 34-14.
3.4. Installation conditions
Install the generator in a ventilated room. If installed in closed areas the alternators should have a possibility to exchange the cooling air
directly with atmosphere. Air outlet and inlet openings should not be obstructed: provisions should be taken to prevent obstacles from
obstructing ventilation openings. The inlet of warm air should be avoided.
Provision should be taken to make inspection and maintenance easy when the generator is installed or during operation.

3.5. Alignment

Carefully align the generator and the driving machine.
Inaccurate alignment may lead to vibrations and damage of the bearings.
It is also necessary to verify that the torsional characteristics of generator and driving machine are compatible. In order to allow
torsional analysis calculation (at customer's charge); MarelliMotori can provide rotor drawings for torsional analysis purposes.
For single bearing generators it is further necessary to verify all dimensions of the flywheel and flywheel housing. Furthermore it is
necessary to check the dimensions of the coupling and of the flange on the generator.

3.6. Electrical connection

Standard generators are supplied with 12 leads (9 terminals).
The entry of the terminal cables in the terminal box is on the right. Entry on the left is possible after having moved the voltage regulator
to the right.
Terminals arrangement permits star series and star parallel connection: it is anyway necessary, when changing the connection from
star series to star parallel, to check and modify the connection to the voltage regulator, according applicable diagrams.
S ta r c o n n e c ti o n
(T 1 )
U 1
U 2
(T 4 )
U 5 (T 7 )
U 6 (T 1 0 )
W 6 V 6
V 5
W 5
W 2
(T 1 2 ) V 2
(T 1 1 )
W 1
(T 9 ) V 1
(T 8 )
(T 6 )
(T 5 )
(T 3 )
(T 2 )
Internal connection diagrams are shown last pages for standard generators (12 leads, with AVR only).
The output cables have to be fixed to the terminal board as indicated in the following figure.
Direction of rotation
Generators are normally supplied to operate correctly when rotating clockwise (looking from shaft end side).
Grounding
Inside the terminal box there is a terminal for grounding, and a second terminal is on a foot of the generator. Grounding has
to be carried out using a copper wire of suitable size, in compliance with applicable standards.

3.7. Single phase loads

The standard three phase generators of this series can be used as single phase if the following instructions are followed:
The generator should be used for a maximum power equivalent to 0,6 times the power indicated on the nameplate for three
phase load.
Wiring diagram for standard generators
W INDING
S ta r p a ra l l e l c o n n e c ti o n
(T 7 )
(T 1 )
(T 4 )
(T 1 0 )
(T 1 2 )
(T 1 1 )
(T 9 )
(T 8 )
(T 6 ) (T 5 )
(T 2 )
(T 3 )
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