Generac DUARDIAN 04077-2 - Manual (Page 11)

Section 2 — O peration
Guardian Air-cooled 6 kW, 8 kW and 10 kW Generators
OPERATION
pit
D. utility Voltage Pickup Sensor
• This sensor monitors utility power supply volt­
age. When that voltage is restored above 80 per­
cent of the nominal source voltage, a retransfer
time delay starts timing.
E. Retransfer Time Delay
• This timer runs for about 15 seconds.
• At end of a 15-second delay, circuit board
action de-energizes transfer relay in the trans­
fer switch.
• Retransfer to utility power source then occurs.
F. Engine Cool-down Timer
• When the load is transferred back to utility
power source, the engine cool-down timer
starts timing.
• The timer will run for about one minute, and
the generator will then shut down.
2.4 MANUAL TRANSFER OPERATION
♦ 2.4.1 TRANSFER TO GENERATOR
_______POWER SOURCE________________
To start the generator and activate the transfer
switch manually, proceed as follows;
1. Set the generator’s Auto/Off/Manual switch
to OFF.
Set the generator’s main circuit breaker to its
OFF (or open) position.
Turn OFF the utility power supply to the trans­
fer switch using the means provided (such as a
utility main line circuit breaker).
2 .
3.
A
DANGER
Do not attempt to activate the transfer switch
manually until all power voltage supplies to
the switch have been positively turned off.
Failure to turn off all power voltage supplies
may result in extremely hazardous and possibly
fatal electrical shock.
Figure 2.2
-
Manual Transfer Switch Operation
\
IDAI CfilMECTEI TO imUTY PONEH SOURCE
LOU COMECTEl TO STMS8Y HmU SOMCI
4. Use the manual transfer handle inside the
transfer switch to move the main contacts to
their "Standby” position, i.e., loads connected to
the standby power source (Figure 2.2).
5. Turn ON the utility power supply to the trans­
fer switch using the means provided (such as a
utility main line circuit breaker).
6. To crank and start the engine, set the
Auto/Off/Manual switch to MANUAL.
7. Let the engine stabilize and warm up for a few
minutes.
8. Set the generator’s main circuit breaker to its
ON (or closed) position. The standby power
source now powers the loads.
♦ 2A2 TRANSFER BACK TO UTILITY POWER SOURCE
When utility power has been restored, you will want
to transfer back to that source and shut down the
generator. This can be accomplished as follows:
1. Set the generator’s main circuit breaker to its
OFF (or open) position.
2. Let the engine run for a minute or two at no-
load to stabilize the internal temperatures.
3. Set the generator’s Auto/Off/Manual switch to
its OFF (or open) position. The engine should
shut down.
4. Chepk that utility power supply to the transfer
switch is turned OFF.
A
5.
DANGER
Do not attempt to activate the transfer switch
manually until all power voltage supplies
to the switch have been positively turned off.
Failure to turn off all power voltage supplies
may result in extremely hazardous and possibly
fatal electrical shock.
Use the manual transfer handle inside the
transfer switch to move the main contacts back
to their “Utility” position, i.e., loads connected
to the utility power source (Figure 2.2).
Turn ON the utility power supply to the trans­
fer switch using the means provided.
Set the system to automatic operation as out­
lined in “Automatic Transfer Operation,” section
2
.
2
.
2.5 SETTING THE EXERCISE TIMER
Your generator is equipped with an exercise timer.
Once it is set, the generator will start and exercise
once every 14 days, on the day of the week and at
the time of day you complete the following
sequence. During this exercise period, the unit
runs for approximately seven minutes and then
shuts down. Transfer of loads to the generator out­
put does not occur during the exercise cycle.
Senerao® Power Syst:ems, Inc. S