C18 (60 Hz) Tier 4

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The C18 diesel generator sets have been developed for your mission critical, standby and prime applications. Producing reliable power from 455 to 500 ekW at 60 Hz, meeting ISO 8528-5 transient response requirements and built to accept 100 percent rated load in one step. The engines are certified to the US EPA Tier 4 Final emissions levels.

Generator Set Specifications

  • Minimum Rating 455 ekW 455 ekW
  • Maximum Rating 500 ekW 500 ekW
  • Emissions/Fuel Strategy U.S. EPA Tier 4 Final U.S. EPA Tier 4 Final
  • Voltage 480 Volts 480 Volts
  • Frequency 60 Hz 60 Hz
  • Speed 1800 rpm 1800 rpm
  • Duty Cycle Standby, Prime Standby, Prime

Engine Specifications

  • Engine Model C18 ATAAC, I-6, 4-Stroke Water-Cooled Diesel C18 ATAAC, I-6, 4-Stroke Water-Cooled Diesel
  • Bore 1455.7 in 145.0 mm
  • Stroke 7.2 in 183.0 mm
  • Displacement 1106.4 in³ 18.1 l
  • Compression Ratio 14.5:1 14.5:1
  • Aspiration Air to Air Aftercooled Air to Air Aftercooled
  • Fuel System Electronic unit injection Electronic unit injection
  • Governor Type Adem™A4 Adem™A4

Cat Generator Set Package

  • Cat generator set packages have been fully prototype tested
  • Accepts 100% block load in one step and meets other NFPA 110 loading requirements
  • Conform to ISO 8528-5 steady state and transient response requirements
  • Cat Diesel Engine

  • Reliable, rugged, durable design
  • Field-proven in thousands of applications worldwide
  • Four-stroke-cycle diesel engine combines consistent performance and excellent fuel economy with minimum weight
  • SR5 Alternator

  • Superior motor starting capability minimizes need for oversizing alternator
  • Designed to match performance and output characteristics of Cat diesel engines
  • Robust Class H insulation
  • EMCP Control Panel

  • User-friendly interface and navigation
  • Scalable system to meet a wide range of installation requirement
  • Expansion modules and site-specific programming for specific customer requirements
  • Cooling System

  • Designed to operate in standard ambient temperatures up to 55°C (131°F)
  • Contact your Cat Dealer for specific ambient and altitude capabilities
  • Certifications

    Fully prototype tested with certified torsional vibration analysis available

    One Safe Source

  • Components used in the generator set are selected based on seamless design integration to provide the optimum performance
  • The generator set is fully assembled at a Caterpillar facility following our quality guidelines
  • Each generator set package is tested before leaving the Caterpillar facility
  • Cat product support, including dealer service, parts and warranty covers the entire Cat power system
  • World Wide Product Support

  • Cat dealers have over 1,800 dealer branch stores operating in 200 countries
  • Your local Cat dealer provides extensive post-sale support, including maintenance and repair agreements
  • Cat Clean Emissions Module (CEM)

  • The Tier 4 Final engine has been optimized to work with the Cat CEM.
  • The CEM is a reliable, compact, and lightweight system that gives maximum installation flexibility.
  • It features a diesel oxidation catalyst for particulate matter (PM) and hydrocarbon (HC) control.
  • Selective catalytic reduction (SCR) reduces NOx output and provides integrated sound attenuation.
  • The CEM is controlled by a separate dosing module that has been integrated into the standard generator set controls for complete monitoring, protection and closed loop NOx control.
  • For more information on the CEM, refer to cut sheet LEHE0359.
  • UL 2200 / CSA - Optional

  • UL 2200 listed packages
  • CSA Certified
  • Certain restrictions may apply.
  • Consult with your Cat® Dealer.
  • C18 (60 Hz) Tier 4 Standard Equipment

    Exhaust System

    • Exhaust manifold; dry

    Fuel System

    • Primary fuel filter w/integral water separator & secondary filter
    • Fuel cooler
    • Fuel priming pump
    • Flexible fuel lines
    • Engine fuel transfer pump

    Governing System

    • Cat Electronic Governor (ADEM A4)

    Lube System

    • Oil cooler
    • Lubricating oil
    • Oil filter and dipstick
    • Oil drain lines with valve; piped to edge of base
    • Fumes disposal; piped to front of radiator

    Protection System

    • Safety shutoffs for: Higher water temperature - Overspeed - Low oil pressure

    Cooling System

    • Coolant drain line with valve; terminated on edge of base
    • Fan and belt guards
    • Coolant Level Sensor
    • Thermostats and housing, full open temperature 92 deg C (198 deg F)
    • Coolant level sight gauge.
    • Jacket water pump, gear driven, centrifugal
    • Caterpillar Extended Life Coolant


    • 24-volt electric starting motor
    • 24V, 45 amp charging alternator.


    • Paint, Caterpillar yellow
    • Vibration damper
    • Parts book
    • Operation and maintenance manual pack and OMM Storage Compartment

    Control System

    • EMCP 4.2
    • Controls include: Run / auto / stop control - Speed adjust - Voltage adjust - Engine cycle crank - Emergency stop pushbutton
    • Digital indication for: rpm - DC volts - operating hours - Oil pressure (psi, kPa or bar) - Coolant temperature (C or F) - Volts (L-L & L-N), frequency (Hz) - Amps (per phase & average) - Power factor (per phase & average) - kW (per phase & average) - kVA (per phase & average) - kVAr (per phase and average) - kW-hr (total) - kVAr-hr (total)
    • Warning / Shutdowns with common LED indication of shutdowns for: Low oil pressure - high coolant temperature - Overspeed - Emergency stop - Failure to start (overcrank) - Low coolant temperature - Low coolant level
    • Programmable protective relaying functions: Generator phase sequence - Over / Under voltage (27/59) - Over / Under frequency (81 o/u) - Overcurrent (50/51)
    • Programmable Input / Output: 2 programmable digital inputs - 2 programmable relay outputs (Form A) - 2 programmable relay outputs (Form C)
    • Communications: Customer data link (RS485 Modbus RTu) - Serial annunciator module data link for local and remote annunciator IVR - Integrated Voltage Regulation (Digital) - EM10 Excitation Module
    • Control panel mounting location
    • Local annunciator
    • Remote annunciators
    • Control panel options: Dust proof control panel - volt free contact - Device server - Ground fault relay
    • Optional external analog input
    • Breaker box mounting location
    • Suitable for use as service equipment label
    • Separation plate

    Generator and Attachments

    • Brushless, self-excited 2/3 pitch, random wound.
    • IP23 Protection
    • Insulation Class H and temperature rise
    • Power center, IP22 bottom cable entry
    • Segregated low voltage (AC/DC) wiring panel
    • AREP generator
    • CIP - generators

    Air Inlet System

    • Single element air filter
    • Air cleaner - Single element
    • Air cleaner - Heavy duty

    Extended Service Coverage

    • Silver, Gold and Platinum coverage

    Circuit breakers

    • 3 Pole 100% rated

    C18 (60 Hz) Tier 4 Optional Equipment

    Control System

    • EMCP 4.4
    • Control panel mounting
    • Local annunciator
    • Remote annunciators
    • Dust proof control panel
    • Volt free contact
    • Device server
    • Ground fault relay
    • Optional external analog input
    • Breaker box mounting location
    • Separation plate
    • Remote E-stop button

    Generators and Attachments

    • AREP Generator
    • CIP generators
    • Generator mounting and duct plate
    • Space heater

    Air Inlet System

    • Single element air filter
    • Dual element air cleaner


    • IBC certification wind load
    • Certificate of compliance

    Circuit breakers

    • Package mounted single circuit breakers
    • Motorized single circuit breaker
    • Dual breakers first circuit breaker (CB1) LS/I package mounted
    • Dual breakers first circuit breaker (CB2) LS/I package mounted
    • Auxiliary contacts
    • Neutral bars
    • Current transformers
    • Power cables

    Cooling System

    • Standard radiator
    • Aftertreatment guard


    • Sound attenuated enclosures

    Exhaust System

    • Exhaust flexible fittings
    • Flange kits

    Fuel System

    • 660 gallon base tank

    Generator Attachments

    • Permanent magnet generator

    Mounting System

    • Standard base Wide
    • Optional CB shroud
    • Locking fuel fill
    • 5 gallon spill containment
    • Overfill prevention valve

    Starting / Charging System

    • 10 Amp dual battery charger
    • Battery disconnect switch
    • Jacket water heater
    • Shore power control group


    • PGS test report @ 1.0 power factor
    • PGS test report @ 0.8 power factor
    • Generator test report
    • 4 Hour factory test (un-witnessed)

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