Guardian 4389 Repair Manual page 114

SECTION 4.4
DIAGNOSTIC TESTS
Unit 120 Volts
7 kW 50.0 amps
12 kW 100.0 amps
15 kW 108.3 amps
5. When full load has been achieved, connect a frequency
meter to the output lugs of the generator main line cir-
cuit breaker.
The fuel regulator is fitted with one (7 kW), or two (12 &
15 kW) adjustment screws. While watching the frequen-
cy meter, slowly turn the adjustment screw(s) clockwise
or counterclockwise one at a time until highest frequen-
cy is read on the meter.
Note: Only limited adjustment is available
between the set pins on fuel regulators. Under no
circumstance should any of the pins be removed
(see Figures 30 & 31).
6. When the highest frequency is reached, maximum
power has been set. From this point turn the adjustment
screw(s) 1/4 turn counterclockwise. The regulator is
now set.
V-TWIN
(12 & 15 KW)
ADJUSTMENT
SCREW
(BOTH SIDES)
Figure 30
Figure 31
Page 112
240 Volts
25.0 amps
50.0 amps
54.1 amps
SINGLE CYLINDER
(7 KW)
ADJUSTMENT
SCREW
(ONE SIDE
ONLY)
SET
PINS
PART 4
7. Turn utility power to the main distribution panel back on.
This can be done by switching the service main breaker
to the "ON" or closed position. Allow the generator to
shut down.
DO NOT MAKE ANY UNNECESSARY ADJUST-
MENTS. FACTORY SETTINGS ARE CORRECT FOR
MOST APPLICATIONS. HOWEVER, WHEN MAKING
ADJUSTMENTS, BE CAREFUL TO AVOID OVER-
SPEEDING THE ENGINE.
TEST 64 - CHECK BATTERY CHARGE
OUTPUT
DISCUSSION:
The battery charging system is a two amp trickle
charge. It is capable of maintaining a charge on a
functional battery. It is not intended to, nor capable of
charging a completely dead battery.
The system will charge when utility source power is
available to the generator or if the generator is run-
ning. The system consists of a transformer (TX), bat-
tery charge relay (BCR), battery charger (BC), and a
battery charge winding. The BCR contacts allow AC
voltage to the battery charger. When the BCR is de-
energized, voltage from the TX is available to the bat-
tery charger. When the generator starts, Wire 14
energizes the BCR. This allows battery charge wind-
ing AC output to power the battery charger.
PROCEDURE:
1. Check the 5 amp fuse (F2).
2. Set the AUTO-OFF-MANUAL switch to OFF.
Note: Utility source voltage MUST be available to
the generator.
3. Set a VOM to measure DC amps.
4. Disconnect Wire 13A (purple) from the 5 amp fuse (F2).
5. Connect the positive (+) test lead to Wire 13A, and con-
nect the negative (-) test lead to the fuse (F2) terminal
from which Wire 13A was removed. The VOM should
measure 50 milliamps to 2.5 amps, depending upon the
state of the charge of the battery.
6. Repeat Step 5. This time set the AUTO-OFF-MANUAL
switch to MANUAL. Allow the generator to start and
then measure the current again as in Step 5.
RESULTS:
Follow the Problem 13 Flow Chart in Section 4.3.
DC CONTROL