Fault
Current
Sustaining. A close inspection
of
Figure 1 will show that the
Lima®
MAC generator
derives its excitation from load current. Thus, these units will support in the order
of
500%
of
rated
current in fault current during fault conditions assuring fault clearance without the addition
of
any
form
of
excitation support system.
In
a sense, the exciter is a total current boost system.
OPERATION
Pre-Start
Inspection. Before starting the unit for the first time, the following inspection and checks
are recommended:
1.
A visual inspection should be made for any loose parts, connections,
or
foreign materials such as
cut offtiewrap ends, scrap insulating tape, tools,
hardware, etc
..
2. Check for clearance in the generator and exciter air gap. Insure that the set turns freely.
Bar
the
set over by hand for at least 2 revolutions
to
be
sure that there is no interference.
WARNING
NEVER
"BAR
OVER"
THE
ENGINE-GENERATOR
SET
USING
THE
GENERATOR'S
FAN
AS A FULCRUM.
FAN
MATERIAL
IS
LIGHT
WEIGHT
ALUMINUM
AND
NOT
DESIGNED
FOR
TIDS
PURPOSE.
BARRING
OVER
THE
SET
WITH
THE
FAN
COULD
DAMAGE
THE
FAN AND
RESULT
IN
INJURY
TO
PERSONNEL
OR
DAMAGE
TO
THE
EQUIPMENT.
3. Check all wiring against the proper connection diagrams, and insure that all connections
on
the
terminal strip are securely tightened.
4.
Insure that
all
equipment is properly grounded (earthed).
5.
Inspect for any remaining packing materials and remove any loose debris, rags, etc., that could
be drawn into the generator.
6. Check
all
fasteners for tightness.
7.
Check
all
covers, screens and guards.
If
they have been removed for assembly
or
inspection,
reinstall and check for security.
8. Review
all engine pre-start instructions, and insure that
all
recommended steps and procedures
have been adhered to.
Starting-up
the
Generator
Set. The following procedure should be followed for starting-up the
generator set for the first time.
1.
The generator output must be disconnected from the load.
Be
sure that the
main
circuit breaker
on
the open position.
8
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