Automatic Transfer Operation; Automatic Sequence Of Operation; Mains (Utility) Power Failure; Cranking - Generac Power Systems G0071450 Owner's Manual

Operation

Automatic Transfer Operation

Proceed as follows to select automatic operation:
1. Verify generator set is not running.
2. Verify normal mains power source voltage is avail-
able to loads connected after transfer switch.
3. Press AUTO button on control panel.
4. Verify generator set MLCB (generator set discon-
nect) is set to ON (CLOSED).
The generator set will start automatically when mains
power source voltage drops below a preset level. Loads
are transferred to standby power source after unit starts.

Automatic Sequence of Operation

Mains (Utility) Power Failure

If the generator set is set to AUTO, when mains power
fails (below 156 volts), a five second line interrupt delay
timer is started (voltage and delay timer are dealer pro-
grammable). The engine cranks and starts if mains
power is still gone when the timer expires. An engine
warmup timer will be initiated once started. Timer dura-
tion varies depending on whether or not Cold Smart Start
is enabled. The controller will transfer the load to the gen-
erator set when the warmup time expires. If mains power
is restored (above 190 volts, dealer programmable) at
any time from the initiation of the engine start until the
generator set is ready to accept load (warmup time has
not elapsed), the controller completes the start cycle and
runs the generator set through its normal cooldown cycle.
However, the load will remain on the mains power
source.

Cranking

The system will go through five cyclic cranking cycles as
follows: 16 seconds cranking, 7 seconds resting, 16 sec-
onds cranking, 7 seconds resting, followed by three addi-
tional cycles of 7 seconds cranking followed by 7
seconds resting. An alarm will be triggered if the genera-
tor set does not start after five attempts.

Cold Smart Start

The Cold Smart Start feature is enabled at the factory, but
can be disabled in the EDIT menu. The generator set will
monitor ambient temperature when Cold Smart Start is
enabled. The warmup delay will be adjusted based on
prevailing conditions.
If the ambient temperature is below a fixed temperature
(based on model) upon startup in AUTO mode, the gen-
erator set will warm up for 30 seconds before a load is
applied. The generator set will start with the normal war-
mup delay of five seconds if the ambient temperature is
at or above the fixed temperature.
A check for proper output voltage buildup is performed
when the generator set engine is started.
24

Cleaning Cycle

If some condition impedes normal voltage creation, such
as frost crystals or dust/dirt preventing a good electrical
connection, the start sequence will be interrupted for a
cleaning cycle of the internal electrical connections.
Cleaning cycle is an extended warmup period which lasts
for several minutes as normal generator set voltage out-
put is determined to be low. During this cycle, generator
set controller will display "Warming Up".
Generator set controller display will show "Under Volt-
age" if the cleaning cycle fails to clear the obstruction.
After several minutes, the alarm message can be cleared
and the generator set restarted.
Make no further attempts to start if problem persists.
Contact an IASD.

Load Transfer

Load transfer priorities when the generator set is running
depend upon the transfer switch design. See transfer
switch owner's manual.
Shutting Generator Set Down While
Under Load Or During A Mains Power
Outage
Automatic start-up. Disconnect mains
power and render the equipment
inoperable before attempting repairs or
maintenance.
IMPORTANT NOTE: To avoid equipment damage,
follow these steps, in order, during mains power out-
ages. Shutdowns may be required during mains
power outages to perform routine maintenance or to
conserve fuel.
To turn generator OFF:
1. Turn off mains power supply to transfer switch
using means provided (such as a mains MLCB).
2. Set main circuit breaker in distribution panel to
OFF (OPEN) to remove all loads from generator
set.
3. To shut down generator set:
– Allow generator set to run for five minutes at no
load.
– After five minutes, use emergency stop button to
shut down generator set.
– Wait 15 minutes to allow internal temperature to
stabilize.
NOTE: Failure to follow this procedure may expose user
to hot surfaces. See Hot Surfaces
Owner's Manual for 50 Hz Air-Cooled Generator Sets
ISO000191a
in Section 1.