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QT070

GENERAC QT070 Liquid Cooled Gas Engine Generator Sets

Standby Power Rating
70 kW 60 Hz

GENERAC QT070 70kW Liquid Cooled Gas Engine Generator for large homes and Buildings

GENERAC - 6.8L ENGINE
Naturally Aspirated - Gaseous Fueled

STANDARD EQUIPMENT

  
  • All input connections in one single area
  • High coolant temperature shutdown
  • Low oil pressure shutdown
  • Low coolant level automatic shutdown
  • Low fuel pressure
  • Overspeed automatic shutdown
  • Adjustable cranking timer
  • Adjustable exercise timer
  • Oil drain extension
  • Cool flow radiator
  • Closed coolant recovery system
  • UV/Ozone resistant hoses
  • Watertight state of the art electrical connectors
  • Mainline circuit breaker
  • Oil drain extension to frame rail
  • Radiator drain extension
  • Battery charge alternator
  • 2 Amp static battery charger
  • Battery and battery cables
  • Battery rack
  • Fan and belt guards
  • Isochronous governor

FEATURES

  
  • Innovative design and fully prototype tested
  • UL2200 Listed
  • Solid state frequency compensated digital
    voltage regulator
  • Dynamic and static battery charger
  • Sound attenuated acoustically designed enclosure
  • Quiet test for low noise level exercise
  • Acoustically designed engine cooling system
  • High flow low noise factory engineered exhaust system
  • State of the art digital control system with H-100 microprocessor control panel
  • Built-in kW, kVAR and power factor meters
  • Watertight electrical connectors
  • Rodent proof construction
  • High efficiency, low distortion Generac designed alternator
  • Vibration isolated from mounting base
  • Matching Generac transfer switches engineered and tested to work as a system
  • All components easily accessible for maintenance
  • Electrostatically applied powder paint

APPLICATION & ENGINEERING DATA

GENERATOR SPECIFICATIONS
TYPE............................................................................................................Synchronous
ROTOR INSULATION...........................................................................................Class H
STATOR INSULATION..........................................................................................Class H
TOTAL HARMONIC DISTORTION.........................................................................<3.5%
TELEPHONE INTERFERENCE FACTOR (TIF).........................................................<50
ALTERNATOR OUTPUT LEADS 3 PHASE............................................................4 wire
BEARINGS.....................................................................................................Sealed Ball
COUPLING...................................................................................................Flexible Disc
LOAD CAPACITY (STANDBY RATING).................................................................70 kW
EXCITATION SYSTEM......................................................................................Brushless

NOTE: Generator rating and performance in accordance with ISO8528-5, BS5514, SAE J1349, ISO3046, and DIN6271 standards.

VOLTAGE REGULATOR
TYPE................................................................................................................Full Digital
SENSING............................................................................................................3 Phase
REGULATION........................................................................................................± 1/4%
FEATURES........................................................................Built into H-100 Control PanelV/F Adjustable - Adjustable Voltage and Gain

GENERATOR FEATURES

  • Revolving field heavy duty generator
  • Directly connected to the engine
  • Operating temperature rise 120 °C above a 40 °C ambient
  • Insulation is Class H rated at 150 °C rise
  • All prototype models have passed three phase short circuit testing

CONTROL PANEL FEATURES

TWO FOUR LINE LCD DISPLAYS READ:

  • Voltage (all phases) • Current (all phases)
  • Power factor • kW
  • kVAR • Transfer switch status
  • Engine speed • Low fuel pressure
  • Run hours • Service reminders
  • Fault history • Oil pressure
  • Coolant temperature • Time and date
  • Low oil pressure shutdown • High coolant temperature shutdown
  • Overvoltage • Overspeed
  • Low coolant level • Low coolant level
  • Not in auto position (flashing light) • Exercise speed
  • ATS selection

INTERNAL FUNCTIONS:

  • I2T function for alternator protection from line to neutral and line to line short circuits
  • Emergency stop
  • Programmable auto crank function
  • 2 wire start for any transfer switch
  • Communicates with the Generac HTS transfer switch
  • Built-in 7 day exerciser
  • Adjustable engine speed at exerciser
  • RS232 port for GenLink® control
  • RS485 port remote communication
  • Canbus addressable
  • Governor controller and voltage regulator are built into the master control board
  • Temperature range -40 °C to 70 °C

ENGINE SPECIFICATIONS
MAKE................................................................................... Generac
MODEL....................................................................................V Type
CYLINDERS.............................................................................10
DISPLACEMENT......................................................................6.8 Liter
BORE.....................................................................................3.55
STROKE.................................................................................4.17
COMPRESSION RATIO............................................................9:1
INTAKE AIR SYSTEM.......................................Naturally Aspirated
VALVE SEATS.............................................................Hardened
LIFTER TYPE..................................................................Hydraulic

GOVERNOR SPECIFICATIONS
TYPE.....................................................................................Electronic
FREQUENCY REGULATION..............................................Isochronous
STEADY STATE REGULATION...............................................± 0.25%
All functions are factory preset
Individual parameter adjustments can be made via GenLink®

ENGINE LUBRICATION SYSTEM
OIL PUMP..................................................................................Gear
OIL FILTER..............................................Full flow spin-on cartridge
CRANKCASE CAPACITY......................................................5 Quarts

ENGINE COOLING SYSTEM
TYPE....................................................................................Closed
WATER PUMP.................................................................Belt driven
FAN SPEED............................................................................2030
FAN DIAMETER...............................................................22 inches
FAN MODE..........................................................................Pusher

FUEL SYSTEM
FUEL TYPE...............................................Natural gas, propane vapor
CARBURETOR...............................................................Down Draft
SECONDARY FUEL REGULATOR....................................Standard
FUEL SHUT OFF SOLENOID.............................................Standard
OPERATING FUEL PRESSUR.....................................11” - 14” H2O

ELECTRICAL SYSTEM
BATTERY CHARGE ALTERNATOR..................................12V 30 Amp
STATIC BATTERY CHARGER............................................12V 2 Amp
RECOMMENDED BATTERY.................................Group 24F, 525CCA
SYSTEM VOLTAGE................................................................12 Volts
Rating definitions - Standby: Applicable for supplying emergency power for the duration of the utility power outage. No overload capability is available for this rating. (All ratings in accordance with BS5514, ISO3046 and DIN6271). (All ratings in accordance with BS5514, ISO3046, ISO8528 and DIN6271).

OPERATING DATA
KW RATING 70
ENGINE SIZE 6.8 Liter V-10
GENERATOR OUTPUT VOLTAGE/KW - 60 Hz

KW

AMP CB Size
120/240V, 1-phase, 1.0 pf
120/240V, 3-phase, 0.8 pf
120/208V, 3-phase, 0.8 pf
277/480V, 3-phase, 0.8 pf 		70
70
70
70		 292
210
243
105
 300
250
300
125
GENERATOR LOCKED ROTOR KVA
AVAILABLE @ VOLTAGE DIP OF 35%
Single phase or 208-240 3-phase
480V 3-phase

145
160
ENGINE FUEL CONSUMPTION (Natural Gas) (Propane) Natural Gas
Propane
  (ft3/hr.) (gal/hr.) cu ft/hr
Exercise cycle
25% of rated load
50% of rated load
75% of rated load
100% of rated load 		110
260
499
696
1020

 1.20
2.85
5.46
7.62
11.17		 44.2
104.9
200.9
280.4
411
ENGINE COOLING
Air flow (inlet air including alternator and combustion air) ft3/min.
System coolant capacity US gal.
Heat rejection to coolant BTU/hr.
Max. operating air temp. on radiator °C (°F)
Max. ambient temperature °C (°F)

5200
4.5
287,000
60 (150)
50 (140)
COMBUSTION AIR REQUIREMENTS
Flow at rated power 60 Hz cfm		   205  
SOUND EMISSIONS IN DBA
Exercising at 7 meters
Normal operation at 7 meters
  
61
65		  
EXHAUST
Exhaust flow at rated output 60 Hz cfm
Exhaust temp. at muffler outlet °F		  
557
890		  
ENGINE PARAMETERS
Rated synchronous RPM 60 Hz
HP at rated KW 60 Hz
 
1800
110.7		  

POWER ADJUSTMENT FOR AMBIENT CONDITIONS
Temperature Deration

3% for every 10 °C above - °C
1.65% for every 10 °F above - °F

Altitude Deration

1% for every 100 m above - m
3% for every 1000 ft. above - ft.

  


25
77



183
600		  

RATING: All three phases units are rated at 0.8 power factor. All single phase units are rated at 1.0 power factor. STANDBY RATING: Standby ratings apply to installations served by a reliable utility source. The standby rating is applicable to varying loads for the duration of a power outage. There is no overload capability for this rating. Ratings are in accordance with ISO-3046-1. Design and specifications are subject to change without notice. kW rating is based on LPG fuel and may derate with natural gas.


GENERAC ® POWER SYSTEMS, INC. • P.O. BOX 8 • WAUKESHA, WI 53187
262/544-4811 • FAX 262/544-4851
© 2008 Generac Power Systems, Inc. All rights reserved. All specifications are subject to change without notice.

 

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