Transport And Storage; Installation And Commissioning; Check Before Installation; Insulation Test - MarelliGenerators MJB 250 Instrucciones Y Advertencias De Seguridad

Degree of protection - characteristics
The protection degree of the generators and the rated data are shown on the name plate.
Frequency
The generators are suitable for operation at 50 and 60 Hz, according to the data reported on the name-plate: for correct operation
for 50 or for 60 Hz, it is necessary to verify that the settings of the voltage regulator are proper for the required operation and that the
use of the generator is in accordance with the values on the name-plate.
Accessories
According to the customer's order the generators can be equipped with accessories, such as anticondensation heaters, thermistors,
etc.

2. TRANSPORT AND STORAGE

The generator is shipped ready for installation. It should be carefully inspected on arrival in order to verify if damage has occurred
during transport; if any, they should be referred directly to the haulier and to MarelliMotori
For lifting and handling the purpose made eyebolts must be used.
The lifting eyes are designed to support only the weight of the generator and they are not to be used for lifting the complete
gen-set that incorporates the generator. Check that the lifting means available are suitable for the movement of all parts which
have to be handled. Check also that all the working conditions are suitable to operate without dangers for safety of personnel.
The eyebolts on the endshield are to the alignment of the generator during the fase of coupling to the engine.
Following are the weight of the generators:
Size
MJB 250
MJB 315
MJB 355
If the generator is not put into operation immediately, it should be stored in a covered area or in a clean, dry and vibration-free place. If
it is stored in a damp ambient, the windings should be dried before using it.
The rolling contact bearings do not require maintenance during storage; periodic rotation of the shaft will help to prevent contact
corrosion and hardening of the grease.

3. INSTALLATION AND COMMISSIONING

3.1 Check before installation

Before installing the generator
- make sure that name plate data corresponds to the power supply and operating conditions and that the installation
complies with the manufacturer's recommendations
- clean any protecting varnish from all connecting surfaces (such as surface of couplings and flanges and shaft
extension for two-bearing generators).
The single support generators come supplied with a bracket that holds together the coupling flange and the adapter flange or with
a bolt that blocks the rotor to the non drive side endshield. Before installation, remove the bracket and/or the bolt.

3.2. Insulation test

If the alternator has been kept in storage for a long period of time, it is a good practice to test the stator windings for ground insulation
before starting up.
Before doing this test, it is necessary to disconnect the voltage control system (AVR or similar devices).
If this test, performed using a ohmmeter or another similar instrument, shows that ground resistance is below 5 Mohm, it is necessary
to dry the generator and then the test should be repeated.
Average weight of the generators
SA4 SB4
/ /
830 Kg 920 Kg
1250 Kg 1550 Kg
13
Pack length
MA4 MB4
530 Kg 590 Kg
1060 Kg 1200 Kg
1800 Kg 2030 Kg
13
ENGLISH
LA4 LB4
660 Kg 710 Kg
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