Generac Power Systems GUARDIAN 04137-0 - Manual (Page 13)

Section 2 — Operation
Guardian Liquid-cooied 8 kW Generators
OPERATION
6 &
# 2.8.1 USING AN OPTIONAL GTS
_________ TRANSFER SWITCH_______________________
When you use a GTS-type transfer swatch, it con­
trols automatic operation and automatic transfer
as follows:
• Solid-state circuits in the transfer switch monitor
utility power source voltage.
• When utilitjr source voltage drops below a preset
level, transfer swdtch action closes the engine cir­
cuit. The engine then cranks and starts as con­
trolled by the generator's control module circuit
board.
* After the engine starts and when the generator
A.C output voltage and frequency have reached a
preset value, transfer switch circuits signal the
transfer switch main contacts to move to the
standby power source side. Generator AC output
then pownrs load circuits.
® When the utiliW power source voltage is restored
above a preset level and the return to utility
timer has timed out. the transfer switch solid-
state circuits signal the switch main contacts to
move back to their utility power source side.
» The engine cooldown timer stains and times out.
Then, the transfer switch circuit board action
opens the engine run circuit. The engine then
shuts down.
NOTE:
If yonr generator is installed in conjunction
with an optional GTS-type transfer switch, refer
to
the applicable transfer switch manual for
exact operating parameters and timing
sequences.