Retransfer And Shutdown; Automatic Operation; Weekly Exercise Cycle - Generac Power Systems Guardian 004988-1 Owner's Manual

Liquid-cooled, prepackaged standby generators
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6. Adjust differential pot to make the recovery to
load changes even faster and minimize load
change undershoot and overshoot. If it is set too
high it may introduce oscillations at some load. It
can be set to zero (full CCW) if a small amount
causes oscillations at some load.
Figure 3.2 — Engine Governor Adjustment
U7
C4
C30
R49
U1
V .
R E
0 6
4 9
0 E
0 0
B #
P C
DIFFERENTIAL
STABILITY
3.5

RETRANSFER AND SHUTDOWN

When utility power source voltage has been restored,
electrical loads may be transferred back to that
source and the generator can be shut down as follows:
• Verify that UTILITY power supply voltage to the
transfer switch has been positively turned OFF,
using whatever means provided (such as utility
main line circuit breaker).
• Set the generator's main circuit breaker to its OFF
or OPEN position.
• Let the generator engine run at no-load for a few
minutes, to stabilize internal unit temperatures.
• On the generator console, set the AUTO/OFF/
MANUAL switch to OFF. Wait for engine to come to
a complete stop.
• For transfer to UTILITY position, refer to the
Owner's Manual of the particular transfer switch.
• Turn on the UTILITY power supply to the transfer
switch, using whatever means provided (such as a
utility main line circuit breaker). The utility power
source now powers the loads.
3.6

AUTOMATIC OPERATION

To set the system for fully automatic operation, pro-
ceed as follows:
• Check that load circuits are connected to the
utility power supply.
14 Generac
®
Power Systems, Inc.
Section 3 — Operation
Guardian Liquid-cooled 27 kW and 30 kW Generators
R44
C27
Q2
C9
C26
D10
C21
C2
RL1
RL2
R1
R48
D17
L3
D19
DIP SWITCH
1
POSITION 1
POSITION 2
UNUSED
50/60 HZ
GTS/ATS Select
3
ON = 50 HZ
ON = GTS
2
GTS/ATS
OFF = ATS (standard mode)
OFF = 60 HZ
4
50/60 HZ
• Set the AUTO/OFF/MANUAL switch to its AUTO
position.
• Set the generator main circuit breaker to its ON or
CLOSED position.
3.7

WEEKLY EXERCISE CYCLE

The engine control board will start and run the gen-
erator once every seven days for approximately 12
minutes. If utility should fail during this exercise
period, the engine control board will transfer the load
to the generator output and continue to run until util-
J2
ity returns.
On the day, and at the time of day chosen for the gen-
erator to exercise, set the weekly exercise cycle as fol-
lows:
1. Place the AUTO/OFF/MANUAL switch in the
AUTO position.
2. Press and hold the "Set Exercise" switch for three
seconds, then release.
At this time all five red LEDs will flash for approxi-
mately 10 seconds, then the engine will start and run
for it's 12 minute exercise period, then shut down.
The generator will now start and run each week at the
J1
same time.
If DC power to the control board is lost, the weekly
exercise setting will be lost. This is indicated by all
five red LEDs continually flashing. In this state the
generator will still start and run in manual mode, or
automatically start and run if UTILITY is lost while in
Auto mode, but it will not perform a weekly exercise
cycle.
If a failure occurs while running in this mode, the five
red LEDs will stop flashing, the individual fault LED
will turn on and the engine will shut down. Once the
AUTO/OFF/MANUAL switch has been switch to OFF ,
the individual fault LED will turn OFF and the five
red LEDs will begin flashing to show exercise has still
not been set.
Figure 3.2 - "Set Exercise" Switch
FUSE
4A
BAT.
CHARGER
FUSE
15A
MAIN
OFF
ON
SET
EXERCISE
TIME
F
AUTO
OFF
MANUAL

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