Guardian 4721, Repair Manual

Page: 103 / 115

OPERATIONAL TESTS
AND ADJUSTMENTS
SECTION 5.2
ADJUSTMENTS — LIQUID COOLED UNITS
PART 5
Page 99
SETTING WEEKLY EXERCISE CYCLE
The generator will start and exercise once every
seven (7) days, on a day and at a time of day select-
ed by the installer or operator. The unit will run for
approximately 13-15 minutes during this “exercise”
cycle, and will then shut down. Transfer of electrical
loads to the “standby” power source will not occur
during the exercise.
A switch located on the generator control console per-
mits the day and time of exercise to be selected. To
select the day and time of day for the system to exer-
cise, proceed as follows:
• Place the AUTO-OFF-MANUAL switch to its OFF
position.
• Hold the set exercise time switch at its ON position
for about five (5) seconds.
• After five seconds, release the set exercise time
switch to its OFF position. Wait 30 seconds, then
place the AUTO-OFF-MANUAL switch at AUTO.
The generator will exercise every seven (7) days at
the selected time.
NOTE: Failure to wait 30 seconds before placing
the AUTO-OFF-MANUAL switch to AUTO may
result in engine cranking and startup. If the
engine does crank and start, it will shut-down
automatically within about two (2) minutes.
Figure 1. The “Set Exercise Time” Switch
ENGINE STEPPER MOTOR ELECTRONIC
GOVERNOR
INTRODUCTION:
The governor system consists of a governor module
mounted inside the generator control panel, a stepper
motor mounted near the carburetor, and interconnect-
ing wires and connection boxes. (See Figure 2)
FUSE
15-A
AGC
FAULT
INDICATOR
AUTO
OFF
ON
SET
EXERCISE
TIME
MANUAL
HOURMETER
12 VDC
GROUND
HZ METER
RED
BLACK
BLUE
FREQUENCY
DIRECTION
YELLOW
BROWN
GAIN
STABILITY
DROOP
ORANGE
BLACK
STEPPER MOTOR PART #98290
LOCATED NEAR CARBURETOR
TURN COUNTERCLOCKWISE
TO OPEN THROTTLE SET
DIRCTION SWITCH TO "OFF"
CONTROL MODULE PART #98647
LOCATED IN CONTROL PANEL
Figure 2. Stepper Motor and Control Module