Section 3 —
Guardian
Do not attempt manual transfer switch operation until all power voltage supplies to the transfer switch have been positively turned off. Failure to turn off all power voltage supplies will result in extremely hazardous and possibly fatal electrical shock.
4.Manually set the transfer switch to the STANDBY position, i.e., load terminals connected to the generator's E1/E2 terminals. The transfer switch operating lever should be down.
5.Set the generator's Auto/Off/Manual switch to MANUAL. The engine should crank and start immediately.
6.Let the engine stabilize and warm up for a few minutes.
7.Set the generator’s main circuit breaker to its ON (or closed) position. Loads are now powered by the standby generator.
8.Turn ON electrical loads. Apply an electrical load equal to the full rated wattage/amperage capacity of the installed generator.
9.Connect an accurate AC frequency meter across terminal lugs E1 and E2. Voltage should be greater than 230 volts; frequency should be greater than 58 Hertz.
10.Let the generator run at full rated load for
11.When testing under load is complete, turn OFF electrical loads.
12.Set the generator's main circuit breakers to their OFF (or open) positions.
13.Let the engine run at
14.Set the Auto/Off/Manual switch to OFF. The engine should shut down.
3.5CHECKING AUTOMATIC
OPERATION
To check the system for proper automatic operation, proceed as follows:
1.Check that the Auto/Off/Manual switch is set to OFF.
2.Manually set the transfer switch to the UTILITY position, i.e., load terminals connected to the util- ity power source side.
3.Turn ON the utility power supply to the transfer switch, using the means provided (such as a util- ity main line circuit breaker).
4.Set the Auto/Off/Manual switch to AUTO. The sys- tem is now ready for automatic operation.
5.Turn OFF the utility power supply to the transfer switch.
With the Auto/Off/Manual switch at AUTO, the engine should crank and start when the utility source power is turned OFF. After starting, the transfer switch should connect load circuits to the standby side. Let the system go through its entire automatic sequence of operation.
With the generator running and loads powered by generator AC output, turn ON the utility power sup- ply to the transfer switch. The following should occur:
•After about six seconds, the switch should transfer loads back to the utility power source.
•About one minute after retransfer, the engine should shut down.
3.6ADJUSTING THE LOAD BLOCK
When the natural gas system is being used, the load block is fitted with an adjustment screw that has been calibrated to provide maximum power. However, because of variations in the Btu content of natural gas across the country, it may be necessary to readjust the load block.
• Connect a frequency meter to the output of the generator.
• Start the unit and apply full load according to the following chart:
Unit | 120 Volts | 240 Volts |
6 kW | 50 amps | 25 amps |
8 kW | 66.7 amps | 33.3 amps |
10 kW | 83.3 amps | 41.6 amps |
Sound Attn.: | 66.7 amps | 33.3 amps |
• Allow the unit to stabilize; then, turn the adjust- ment screw slowly clockwise or counterclockwise and watch the frequency.
• When the highest frequency is reached, turn the adjustment screw counterclockwise 1/4 turn.
• The fuel system is now set.
• For LP gas operations, the hose and blanking plug must be reconfigured as shown in Figure 1.3, Page 7. The unit is set to provide maximum power using LP gas.
Do not make any unnecessary adjustments. Factory settings are correct for most applica- tions. However, when making adjustments, be careful to avoid overspeeding the engine.
Generac® Power Systems, Inc. 23
