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Chassis Dynamometer Safety

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Chassis Dynamometer Safety Cummins Southern Plains, Ltd. Chassis Dynamometer Safety Setting Up the Truck Inspection Running the Truck Ventilation System Additional ... – PowerPoint PPT presentation

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Title: Chassis Dynamometer Safety


1
Chassis Dynamometer Safety
Cummins Southern Plains, Ltd.
2
Chassis Dynamometer Safety
  • Setting Up the Truck
  • Inspection
  • Running the Truck
  • Ventilation System
  • Additional Considerations

3
Setting up the Truck
  • Attach the rear safety chain.
  • The rear tie-down chain is the first restraint to
    be installed, and the last to be removed.
  • Do not wrap the rear tie-down chain around brake
    lines or other items that may be easily damaged.

4
Setting up the Truck
  • Rear Safety Chain

Orange hook is a safety back up in case tensioner
fails.
A keeper to the boomer or load tensioner to
keep handle from popping off.
5
Setting up the truck (cont.)
  • The front tie-down straps are the primary
    restraints that provide safety in the event of a
    problem.
  • The rear chain prevents forward movements, but
    side-to-side movements may occur at the rear of
    the vehicle.
  • Before beginning, know your dyno hood clearance
    distance and that a FE is in the area.

6
Setting up the Truck
  • Before placing vehicle on roller, make sure air
    to the facility is turned on. If no air, truck
    will roll off roller and may hit wall. Rollers
    have air applied brakes/spring released.
  • Picture shows a dent in the back wall from a unit
    that rolled off.

7
Inspection
  • Always inspect the tie-down straps and ratchet
    mechanisms for wear. Do not use excessively worn
    or damaged parts.

On tie down straps inspect all strap material
and bolts.
Tie down chains inspect all bolts and keys.
8
Running the Truck
  • Always remain in the drivers seat when conducting
    a test.
  • Never allow observers to be in the room when
    conducting a test.
  • Sensors may be connected to fluids under
    pressure, or may still be hot after a cool-down
    period. Use extreme caution when disconnecting
    sensors.
  • Safety glasses and hearing protection must be
    worn during a test.

9
Running the Truck
  • Never apply the brakes or turn the steering wheel
    while a test is in progress.
  • Always set the vehicle parking brakes and the
    dynamometer roll lock when not executing a test.
  • Emergency stop button is located on the
    wall-mounted interconnect box. In the event of an
    emergency, press the button.
  • Nobody else should be in area when in operation.

Hole in the rear wall from a rock dislodge from a
tire during a test run.
10
Ventilation System
  • Engine exhaust fumes contain particulate matter,
    Carbon Dioxide, and Carbon Monoxide..
  • Never run the engine or conduct a test without
    the proper room ventilation and evacuation for
    exhaust fumes.
  • At least one door of the chassis dyno must be
    open during operation of the ventilation system.

11
Ventilation System
  • These are different exhaust tubes designed for
    different exhaust systems. The curved one in the
    right picture is for busses with exhaust out the
    top. Larger one in front for RVs. Be careful not
    to place the tubes close to housing as it may
    bubble the paint on an RV.

A variety of hose extensions should be available
12
Additional Considerations
Minimum ladder needed to take opacity
measurements on stacks is 8 ft.
Housekeeping with the hoses on the swing out rack
should be maintained at all times.
13
Static Electricity
  • The rotation of rubber tires on steel rolls
    causes static electricity build-up.
  • If the rear tie-down chain is wrapped directly
    around the rear axle or frame cross member, no
    further grounding should be necessary.
  • In all other cases it will be necessary to use a
    grounding clamp attached to the dyno frame or
    other suitable connection point to earth ground.

14
Fuel Safety
  • Keep sparks and open flames away from fuel
    measurement system and the output of the vent
    connection.
  • Personal protective clothing should be worn to
    prevent diesel fuel contact with the skin or
    eyes.
  • Only diesel fuel can be used with the SF-602 fuel
    measurement system. Other fuels may produce
    dangerous vapors. The system is NOT explosion
    proof.
  • The fuel can vent on the side of the cabinet must
    be open to a safe place in the atmosphere.
  • A blocked vent could cause the can to burst or
    leak.

15
Calibration
  • Calibration arm and weight (500 lbs.) for
    calibrating the sensor on the absorption unit.
    Need two people for this lift and a cherry
    picker. Calibration takes place once a year.
  • Need to open pit to access the mounting point for
    the torque arm onto the absorption unit. Uses
    cones and warning line around the pit to keep
    people out.

16
Additional Safety Notes
  • Always remove all test lead and exhaust
    management devices before removing straps and
    chains. This will save you from driving off with
    expensive equipment.
  • Trip hazards from the test equipment and leads
    can be a problem in the dyno room. Keep main
    walkway clear as much as possible.
  • Oil and coolant spills are common. Housekeeping
    is essential.

17
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