Section 2 General Information; Synergy Operating Principle; Benefits; Start Up - Generac Power Systems 6055 Owner's Manual

General Information
Sect ion 2
2.1 — Synergy Operating Principle
2.1.1— Benefits
The Synergy 20 kW generator brings exciting new technology to the Home Standby generator product. The generator
is significantly more fuel efficient than constant speed generators at normal loads, provides premium power quality, and
is significantly quieter while operating at exercise and normal loads.
Exceptionally quiet exercise at 57 dB
Quieter operation - 3 dB with improved tonal qualities at exercise and under normal loads
Cleanest Standby power available with 1.5 THD
Significant fuel savings: more fuel efficient under normal loads
Lower operating speed at 2700 rpm at low loads
Tuned Helmhortz resonator and muffler to further lower sound levels
Variable Speed / Constant Frequency operation
2.1.2— Start Up
When the generator starts up, the engine ramps up to 3600 RPM to produce maximum power. This ensures that there
is sufficient power to carry the load when the transfer switch operates. The engine RPM then gradually ramps down to
a speed appropriate for the attached load.
For example, if there is no load, the engine ramps down to approximately 2700 RPM. The time it takes to ramp down to
2700 RPM is approximately 4-5 minutes. Since the ramp rate is linear, less time would be required for it to ramp down
to only 3400 RPM.
During startup, as the engine ramps up to 3600 RPM, the Automatic Voltage Regulator (AVR) electronics performs a
self test (before transfer) involving an overall system check of the unit. If a fault is detected, the unit shuts down and
displays an alarm.
2.1.3— Normal Running
The engine operates between 2700 RPM - 3600 RPM depending on the attached load. When the load increases or
decreases, the speed increases or decreases accordingly.
2.1.4— Small Load Changes
The system is designed to maintain the current engine speed for small load changes. Larger load changes result in a
change in engine speed to appropriately handle the load.
2.1.5— Large Load (Not Overload)
The engine always runs at a speed appropriate for the attached load. When a large load is applied, the fast Loadshed
signal is activated. All loads attached to the Loadshed controller in the transfer switch are dropped and the engine
speed immediately increases to 3600 RPM. Five seconds later, the Loadshed signal is deactivated and Loads 3 and 4
are sequenced back on, spaced 15 seconds apart. Loads 1 and 2, which are designed for air conditioners, are
sequenced back on after 5 minutes.
The engine speed remains at 3600 RPM for a programmable time (20 minutes default) and then ramps down to the
speed appropriate for the attached load. The programmable time can be changed by the dealer to prevent annoying
ramps up and down in engine speed if large loads turn on and off frequently.
Synergy Automatic Standby Generator Owner's Manual 5