Installation And Commissioning; Insulation Test - MarelliMotori MJB 160 Nstrucciones Y Advertencias De Seguridad

The eyebolts on the end - shield are to the alignment of the generator during the phase of coupling to the engine.
Following are the weight of the generators:
Size
XA4
106 Kg
MJB 160
/
MJB 200
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.
For periods of inactivity for periods of longer than three months, perform the tasks for "prolonged periods of storage" (available on
request).
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.

4. INSTALLATION AND COMMISSIONING

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.
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.

4.1 Insulation test

On the premises of the constructor of the group, if the alternator has remained inactive for a long period of time (more than one
month) it is opportune to execute an insulation test towards ground of the windings of the main stator, before putting it into
service. Before executing this test, it is necessary to disconnect the connections leading to the regulation devices (Voltage
regulator or other devices).
The insulation resistance of windings to heart should be measured using a suitable DC
instrument ("Megger" instrument or a similar one), which output voltage (test voltage) is
equal to 500 V for low voltage generators and not less than 1000 V for medium voltage generators.
Reading of insulation resistance will be done after having applied Megger output for 1 minute to winding.
For a new generator, the stator winding insulation resistance larger of 100 MΩ represent one of essential safety requirements.
SIN.UM.805.6
Average weight of the generators
SA4 SB4
117 Kg 128 Kg
210 Kg 220 Kg
Pack length
SC4 MA4
138 Kg 158 Kg
/ 255 Kg
5
MB4 LA4
170 Kg /
290 Kg 325 Kg
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ENGLISH