Hobart 90CU24, Руководство по эксплуатации и обслуживанию

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c. Testing the No. 1 Output Circuit (See Fig. 1)
(1)
Make certain that the orange No. 2 contactor on-off push button switch (22, Fig. 1) is in the OFF
position, which is indicated when its internal indicating light doesn’t glow. Then press the yellow
No. 1 load contactor push button switch (24, Fig. 1). The No. 1 contactor power ON indicating
light within the push button switch should glow, and an amperage value should appear on the AC
ammeter (12). Hold in this position momentarily.
(2) Release the No. 1 load contactor push button switch. The No. 1 load contactor should open
immediately, and the No. 1 ON indicating light within the push button switch should go OFF.
This is because the interlock circuit of the control PC board is not receiving power from an
outside source of 28 V DC. It indicates that the No. 1 interlock circuit is OPEN as it should be
when the interlock circuit is not receiving 28 V DC power.
(3) Open the control panel door and place the No. 1 test bank switch (30) in TEST BANK position.
(4) Press the No. 1 load contactor push button switch (24). The No. 1 contactor power ON
indicating light within the push button switch should glow and remain ON when the push button
switch is released. This indicates that the No. 1 test bank switch is functioning to bypass the
plug interlock circuit.
(5) Return the No. 1 test bank switch to AIRCRAFT position. The No. 1 load contactor should open
at once and the yellow indicating light within the No. 1 load contactor push button switch should
go OFF.
(6) Connect a source of 24 V-DC power (two twelve-volt batteries connected in series) to terminals
N and F (or E) at the output terminal panel. Connection polarity is important. Connect plus (+)
to terminals E or F, and minus (-) to terminal N.
(7) With test-bank switch in AIRCRAFT position, press the No. 1 contactor operating push button
switch (24) . The No. 1 contactor power ON indicating light, within the push button switch,
should glow and remain on when the push button switch is released. This indicates that the load
contactor is closed and the plug interlock circuit is functioning properly.
(8) Apply 1/3 to 1/2 load (30 to 45-KVA) at the load bank and allow the unit to run for 15 to 30
minutes. Observe operation of all monitoring instruments.
(9) Increase load at the load bank to 90-KVA.
(10)
Check operation of the governor by observing the frequency meter (9, Fig. 1) when generator is
switched from no load to full load. and vice versa. Use the No. 1 contactor control push button
switch to apply and remove load several times. Steady-state frequency droop should be no
more than 1 Hz. Adjust governor if necessary [see Para. 3, E, (3)].
(11)
Follow instructions in Para. 3, B, (2) (b) to set voltage regulator line drop compensation for the
length and size of cable being used.
(12)
Check voltage regulator, at intervals, from no load to full load and on up to 125% load. Observe
and note voltage at various loads. Steady-state voltages should vary no more than +/- 1% from
normal output voltage.
(13) Operate the No. 1 output circuit of the unit not less than 10 minutes under full 90-KVA load. The
overload device (Ref. 1-1; 1, Fig. 9) MUST NOT trip.
(14) Operate the No. 1 output circuit of the unit at 125% load (325 amperes) for 5 minutes
immediately following the full load run. The overload device MUST trip within 5 minutes, and the
overload indicating light on the engine generator control panel must come ON to indicate an
overload condition.
(15) Reduce load to normal. Turn off overload indicating light by pressing reset push button switch
(19, Fig. 1).
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
November 27/1997 Chapter 2-3
Page 5