Load Shed Functionality; Automatic Voltage Regulator (Avr) Cooling Fans - Generac 20 kW Synergy Guia De Instalacion

NOTE: Main AC (E1, E2 and Neutral) wiring must be in accordance with local jurisdiction and codes.
Strip insulation from wire ends. Do not remove excessive insulation.
1.
Remove two cap plugs located behind the breaker door and to the right of the Main Breaker.
2.
Loosen the lugs of the Main Breaker through the access holes.
3.
Insert a power wire (E1 or E2) through the opening in the back cover and into the bottom lug. Torque to the
4.
proper specification.
NOTE: Remove three screws inside the top of the breaker panel (behind the breaker door), and carefully pull
out entire breaker box. When reinstalling, be sure that tabs at the bottom lock into place.
Connect the Neutral wire to the Neutral Lug and torque to specification. See Figure 6-1.
5.
Connect the Ground wire to the Ground Lug and torque to specification. See Figure 6-1.
6.
NOTE: Neutral Bonding - For installations that require the neutral to be bonded to the ground, this is to be
done on the customer connections terminals inside the generator. Connect a suitably sized wire from the neu-
tral bar to the ground bar. This is normally required when the generator is the source in a separately derived
system. It is not required when the generator is a backup source in a utility supplied electrical system with a 2-
pole transfer switch. See Figure 6-1.
NOTE: Torque all wiring lugs, bus bars and connection points to the proper torque specifications. Torque
specifications for the Main Line Circuit Breaker (MLCB) can be found on a decal located on the inside of the
Main Line Circuit Breaker Door.
6.4 — Load Shed Functionality
The Synergy product Transfer Switch includes an Overload Prevention Control Board (OPCB) to shed critical loads.
The OPCB, commonly referred to as the Load Shed Board, has "Fast Load Shed" capability, which effectively prevents
large loads from stalling the engine.
CONNECTED TO THE OPCB. If natural gas is the selected fuel type, then all loads greater than 9kW
must be connected to the OPCB.
pump, etc.
When the generator senses the application of a large load (greater than 10 kW or 2HP) while the engine is at low
speed, the load is instantly shed (within milliseconds) and the engine is instructed to run at 3600 RPM. This action pre-
vents stalling of the engine. The loads are then reapplied when the engine is back up to speed. Normal loads take
about six seconds. Large loads, such as an air conditioner, have specially designated connections on the OPCB, and
are only reapplied after five minutes (to protect the air conditioner motor).
See the Transfer Switch Owner's Manual for a complete description.
6.5 — Automatic Voltage Regulator (AVR) Cooling Fans
The system is equipped with two fans to cool the AVR electronics. The primary fan is powered by AC during operation.
The secondary fan is powered by 12V DC through the controller. The fans are monitored during operation and if a fail-
ure occurs, an alarm is displayed.
The secondary fan continues to operate for up to one hour after the generator is shut down. Proper cooling must occur
before removing either battery connections or 7.5 amp fuse for maintenance or other service activity.
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The secondary 12V DC fan continues to operate for up to one hour after the generator is shut
down, even if the 7.5 amp ATO fuse in the controller is removed. To prevent hand injury,
always exercise caution when working near the AVR fan housing.
NOTE: The AVR cooling air inlet includes a filter. Verify the filter is installed and properly seated at time the
unit is installed. Check the filter at regular maintenance intervals to verify proper airflow. See the Maintenance
section of the Owner's Manual for details.
Installation Guidelines for Air-Cooled Generators
ALL LOADS GREATER THAN 10 kW OR 2 HP (MOTORS) MUST BE
Examples of a large load are a 3T air conditioner, 3 HP well pump, 3 HP sump
Electrical Connections
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