Doosan G20 SIIIA, Operation & Maintenance Manual

Page: 110 / 122

110 G20, 30, 40 SIIIA Operation & Maintenance Manual
Connection checks
WARNING
Electrical installations must comply with the current
legislation in force in the country of use.
Check that:
• The residual circuit-breaker conforms to legislation on
protection of personnel, in force in the country of use,
and has been correctly installed on the alternator
power output as close as possible to the alternator. (In
this case, disconnect the wire of the interference
suppression module linking the neutral).
• Any protection devices in place have not been
tripped.
• If there is an external AVR, the connections between
the alternator and the cabinet are made in
accordance with the connection diagram.
• There is no short-circuit phase-phase or phase-
neutral between the alternator output terminals and
the generator set control cabinet (part of the circuit not
protected by circuit breakers or relays in the cabinet).
• The machine should be connected with the busbar
separating the terminals as shown in the terminal
connection diagram.
• The alternator earth terminal inside the terminal box is
connected to the electrical earth circuit
• The earth terminal (ref 28) is connected to the frame.
The connections inside the terminal box must never be
subjected to stress due to cables connected by the user.
COMMISSIONING
WARNING
The machine can only be started up and used if the
installation is in accordance with the regulations and
instructions defined in this manual.
The machine is tested and set up at the factory. When
first used with no load, make sure that the drive speed is
correct and stable (see the nameplate). With the
regreasable bearing option, we recommend greasing the
bearings at the time of commissioning (See “BEARINGS”
on page 112). On application of the load, the machine
should achieve its rated speed and voltage; however, in
the event of abnormal operation, the machine setting can
be altered (follow the adjustment procedure (See
“SETTING UP” on page 110). If the machine still
operates incorrectly, the cause of the malfunction must
be located (See “BEARINGS” on page 112).
SETTING UP
The various adjustments during tests must be made
by a qualified engineer. Ensure that the drive speed
specified on the nameplate is reached before
commencing adjustment. After operational testing,
replace all access panels or covers. The AVR is used
to make any adjustments to the machine.