Generac Power Systems 004992-0, 004992-1 Engine Governor Adjustments, Manual Transfer START-UP

Page 16

Section 3 — Operation

Guardian 40kW Liquid-cooled Generators

‹3.2.3 15 AMP FUSE

Fuse protects the control console’s DC control circuit against electrical overload. If the fuse has melted open because of an overload, engine cranking and startup cannot occur. If the fuse needs to be replaced, use only an identical 15-amp replacement fuse. (Type AGC)

‹3.2.4 4.0 AMP INLINE FUSE

This fuse protects the battery charger against electri- cal overload. If the fuse needs to be replaced, use only an identical 4 amp replacement fuse (type AG).

NOTE:

This fuse will not remove the + battery input power from the PCB when it opens. This means the exercise timer will not be reset.

‹3.2.5 SET EXERCISE TIME SWITCH

This switch allows programming the generator to start and exercise automatically. “See Weekly Exercise Cycle.”

‹3.2.6 SYSTEM READY LED

The System Ready LED (green) has two main pro- poses. First, the LED will be ON when the AUTO/OFF/MANUAL switch is in the AUTO position, UTILITY is present, and there are no system alarms. This ON state indicates the system is fully ready for automatic operation.

The system ready LED will be OFF when the switch is in the MANUAL or OFF positions.

3.4ENGINE GOVERNOR

ADJUSTMENTS

Engine speed governing is also controlled by the engine control board. Connector J2 on the engine control board interfaces with a governor driver mod- ule and the Bosch throttle body. The engine governor has been set by the factory during final testing of the generator and, in most cases, should not be adjusted.

If, however, adjustments are necessary, or a new engine control board is installed in the generator, the following procedure should be followed (Figure 3.2):

1.Set all three potentiometers (pots) fully counter- clockwise.

2.Under no load condition, increase the GAIN pot as much as possible without causeing instability.

3.Apply 1/4, 1/2, 3/4 and full load to the unit. Decrease the GAIN pot if there is instability at any load point.

4.Under full load condition, increase the stability pot until the unit returns to 60 Hertz (or 50 Hertz in 50 Hertz applications).

5.Reduce load to 3/4, 1/2, 1/4 and no load. Decrease the stability pot if there is instability at any load point.

6.Adjust differential pot to make the recovery to load changes even faster and minimize load change undershoot and overshoot. If it is set too high it may introduce oscillations at some load. It can be set to zero (full CCW) if a small amount causes oscillations at some load.

Figure 3.2 — Engine Governor Adjustment

The system ready LED is also used to indicate the presence of UTILITY sensing at the PCB when the switch is either in the AUTO or MANUAL modes. The LED will flash at the rate of 1/2 second on, 1/2 sec- ond off if the UTILITY sensing level is below the transfer back threshold.

This secondary function is only available with dip switch two in the OFF position (engineered transfer switch application).

3.3MANUAL TRANSFER AND

START-UP

To transfer electrical loads to the Standby (EMER- GENCY) power source side and start the engine man- ually, refer to the Owner’s Manual of the particular transfer switch.

14 Generac® Power Systems, Inc.

LED1

2

U7

C4

C30

R25

R49

U1

.REV

E4906 PCB#

DIFFERENTIAL STABILITY

 

 

 

R44

 

C9

C27

Q2

 

 

 

 

 

 

J2

 

 

 

 

C26

 

 

 

 

D10

 

 

 

 

C21

 

C2

 

 

 

 

 

RL1

 

RL2

 

R1

 

 

 

 

R48

 

 

 

 

D17

 

 

 

 

 

 

 

J1

 

L3

 

 

 

 

 

 

 

D19

 

DIP SWITCH

 

1

UNUSED

POSITION 1

POSITION 2

3

50/60 HZ

GTS/ATS Select

 

 

2

GTS/ATS

ON = 50 HZ

ON = GTS

OFF = 60 HZ

OFF = ATS (standard mode)

4

50/60 HZ

 

 

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Contents Liquid-cooled, Prepackaged Standby Generators ‹ Operation and Maintenance ‹ HOW to Obtain ServiceIntroduction ‹ Read this Manual ThoroughlyTable of Contents General Hazards Electrical Hazards Transfer Switch GeneratorAutomatic System Operation Generator AC Connection Systems‹ 1.7.1 LOW OIL Pressure Switch ‹ 1.7.2 High Coolant Temperature Switch‹ 1.7.3 LOW Coolant Level Switch Generator Fuel SystemUnpacking Lifting the GeneratorSpecifications Reconfiguring the Fuel System‹ 1.10.1 Generator Specifications ‹ 1.10.2 Engine SpecificationsTorque Specifications Before InstallationEngine OIL Recommendations Coolant RecommendationsGenerator Location Generator Mounting SupportBasic Standby Electric System ‹ 2.1.1 Nfpa StandardsTotal Circuit Isolation Method Emergency Circuit Isolation MethodGenerator AC Neutral Connections Transfer Switch Signal Connections Battery Installation‹ 2.9.1 PRE-PACKAGED ATS ‹ 2.9.2 GTS-TYPE ATSPreparation Before START-UP Using AN Engineered GTS Transfer Switch ‹ 3.2.1 AUTO/OFF/MANUAL Switch‹ 3.2.2 Fault Indicator Leds Control Console ComponentsEngine Governor Adjustments ‹ 3.2.5 SET Exercise Time SwitchManual Transfer START-UP ‹ 3.2.6 System Ready LEDAutomatic Operation Weekly Exercise CycleChecking Fluid Levels Overload Protection for Engine DC Electrical SystemCooling System ‹ 4.5.2 Check Battery ‹ 4.5.8 Check FAN Belt‹ 4.5.9 Inspect Engine Governor ‹ 4.5.1 Check Engine OIL LevelMiscellaneous Maintenance ‹ 4.6.1 Cleaning the Generator‹ 4.5.11 Changing the Engine AIR Cleaner ‹ 4.5.13 Coolant Change‹ 4.6.3 Battery Maintenance ‹ 4.6.4 Battery ReplacementScheduled Maintenance Service Maintenance Interval InformationLevel Maintenance Level Troubleshooting Points Problem Cause CorrectionElectrical Data Electrical Data Electrical Data Electrical Data Carrier Rear Bearing Assy Wire Hold Down BatteryBoot Battery Cable Battery Post Covwer BlackSee Latch Detail Assy GRD Wire 99HSB Assembly BASE-DOOR Ground WireIntake Duct HSB Duct Discharge RH FrontGenerac Power Systems, Inc Assy 2A 12V UL Battery Control BOX HSBCover Front Panel HSB Cover TOP Panel HSBGenerac Power Systems, Inc COVER, Flywheel Access ASSEMBLY, ResistorFlexplate 3.9L HSB MACHINING, 3.9L EnginePump Tank Coolant Recovery Radiator Copper BrassVENTURI,3.9L Cryslr HSB 22FAN Radiator Support L/H SideTo Engine Base AIR Cleaner Plate Hold Down AIR CleanerPlate AIR Cleaner TOP Flange Fuel InletLeads Rotor 390 30KW 1P Direct HSB Rotor 390 40KW 1P Direct HSBSTR-390--40AD HSB 433MM LONG3.9L Chrysler Rear Bearing Carrier 390/DRCTNUT TOP Lock FL M12-1.75 OUTWYE, Pipe 3.9L Chrysler Exhaust Flange 2 PipeInstallation Diagram Guardian 40kW Liquid-cooled Generators Guardian 40kW Liquid-cooled Generators This Warranty Shall not Apply to the Following