Commissioning - MarelliGenerators MJB 160 Instrucciones Y Advertencias De Seguridad

The generator can also be connected to zig zag (voltage of 220 – 240 Volt 50Hz or 220 – 240 Volt at 60 Hz) and single
phase load should be connected to terminals U1/T1 and V1/T2.
V2
T 5
V1
T 2
V5
T 8
Supply of leading loads only
It is possible to supply symmetrical leading three phase loads for a maximum (in KVAR) equivalent to 0,25 times the power (in KVA)
indicated on the nameplate.

4.7 Commissioning

Before putting into service it is necessary to check the insulation with a Megger at 500 Vdc after 1 minute of the application of the
test voltage.
For a new generator, the stator winding insulation resistance larger of 100 M
ALREADY OPERATING GENERATORS OR AFTER PROLONGED PERIODS OF INACTIVITY THE MACHINE MUST
NOT BE OPERATED IF THE INSULATION RESISTANCE IS LESS THAN 30 M
this case, it is suggested to dry the winding previously to the generator star-up.
THE MACHINE MUST NOT BE OPERATED IF THE POLARISATION INDEX IS LESS THAN 1,5. (§ 4.8)
In order to prevent risks of electric shock, connect the windings briefly to the ground immediately after measurement.
BEFORE INITIAL START-UP, MAKE THE FOLLOWING CHECKS:
Mechanical checks
- If fixing bolts are securely fixed.
- That the alignment and coupling is correct.
- That the ventilation air is sufficient and that no impurities are drawn in.
- That the protection grids are in place.
- For single bearing generators, that the bolts of the disks are fixed with the correct torque.
Electrical checks
- The plant is provided with the correct electrical protection devices, according to applicable standards.
- That the connection to the terminal block is correctly performed (bolts of terminals properly tightened).
- That no misconnection or short-circuits are present between generator and external breakers: the generator is normally
not protected against short circuits on the connection between generator and external breaker.
In order to avoid any damage to current transformers and to the generator, all current transformers installed on the
generator have to be connected to proper loads: in case the current transformers were not used, they must be
shortcircuited.
SIN.UM.017.11
C o n n e c t i o n z i g – z a g
W 5
T 9
W 6
V6 W 1
T 12
T 3
T 1 1
U 2 U 1
T 4 T 1
W 2
T 6
U 6
U 5
T 1 0
T 7
L O A D
Verify that:
Verify that:
W 6
(T 12 )
W 2 (T 6 )
(T 9)
W 5
U 6 (T 10 )
(T 3 ) V1
U 2 (T 4) W 1
(T 11 )
V6
V2 (T 5 )
1 20 -11 0 V
represent one of essential safety requirements.
23
ENGLISH
B IAN CO – W H I T E
N E R O – B L A C K
R OS S O – R E D
V5 (T 8 ) (T 7)
U 5
(T 2) U 1 (T 1 )
2 4 0 - 22 0V
AT THE TEMPERATURE OF 20° . In