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MistBuster Troubleshooting

MistBuster photo with parts pointed out
NOTE: The blower and motor in the MistBuster are integrated. The unit will not function unless the door interlock switch is depressed (i.e., the filter access door is closed).

INDICATOR LIGHT IS ON AND MOTOR DOES NOT RUN

MistBuster Troubleshooting Guide
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  1. Inspect the motor by checking to see if the motor spins freely by hand. If the motor does not spin freely by hand check for obstructions or replace motor as necessary.
  2. If the motor spins freely by hand try spinning the motor clockwise or counterclockwise then with the motor spinning turn the unit on. If the motor runs and the fan speed can be adjusted by the speed controller replace the motor capacitor.
  3. Try bypassing the speed controller by hooking the supply voltage going into the speed controller directly to the wire that goes from the speed controller to the motor (see schematic). If the motor works with the speed controller bypassed replace the speed controller.

MistBuster caution message

INDICATOR LIGHT IS OFF AND MOTOR RUNS

  1. Remove all electronic cells, close the access door and turn the unit back on. If the indicator light remains out and the motor continues to run, replace the high voltage power supply.
  2. If indicator light comes back on when the electronic cells are removed, there is a short circuit in
    at least one of the electronic cells. Wash and inspect the cell. For instructions on how to wash
    the cell see the routine maintenance section of the owner’s manual.
    Inspect the cell for the following:

    • Damaged or bent collector plates
    • Damaged or bent ionizer grid fins
    • Broken ionizing wires
    • Dirt accumulation on the insulators
    • Dirt accumulation on the collector plates
    • Damaged or corroded electrical contacts
    • Small metal shavings from machining
    • Deformation of the cell
    • The collector plates are properly seated into the slots of the comb on the cell
    • Excessive corrosion on the cell

An ohmmeter may be used to check resistance between the outside frame of the cell
and both the ionizer and collector contacts. In each case, the resistance should be
infinite (open circuit). Anything that is bridging the gap or shrinks the gap between the
energized collector plates or the energized ionizing wires can cause the indicator light to
extinguish or constantly blink due to the electricity shorting out to ground. Occasional
snapping or the occasional light blinking is normal.

INDICATOR LIGHT IS CONSTANTLY BLINKING AND THE MOTOR RUNS

  1. If coolant selector switch (in back on MB 500 and MB 850, in front on MB 2000, front of all MB units with toggle switch) is in oil mode,
    move coolant selector switch to the water-based mode. (Skip to step 3 if you have a toggle coolant selector switch on the front.)
  2. If indicator light now stops flashing in the water-based mode, but flashes in the oil mode, there
    is a short circuit in the collector fins of the electronic cell. See Figure 10 above for cell parts
    identification.
  3. If indicator light flashes in both the water-based mode and the oil mode, remove all electronic
    collector cells, close the door and energize the unit again.
  4. If indicator light continues to flash even without the electronic cell(s) installed, clean or replace the contact boards mounted in the cabinet (Note – clean the red, phenolic material of the
    board, not the electrical contacts themselves).
  5. If the indicator light blinks in either the water soluble or oil mode, and stops blinking when the
    electronic cells are removed, there is a problem with at least one of the electronic collector
    cells. Wash and inspect the cell. For instructions on how to wash the cell see the routine
    maintenance section of the owner’s manual.Inspect the cell for the following:

    • Damaged or bent collector plates
    • Damaged or bent ionizer grid fins
    • Broken ionizing wires
    • Dirt accumulation on the insulators
    • Dirt accumulation on the collector plates
    • Damaged or corroded electrical contacts
    • Small metal shavings from machining
    • Deformation of the cell
    • The collector plates are properly seated into the slots of the comb on the cell
    • Excessive corrosion on the cell

INDICATOR LIGHT IS OFF AND MOTOR DOES NOT RUN

  1. Make sure the unit is getting power and is getting the correct voltage.
  2. Check to make sure the interlock switch is working properly. Make sure there is voltage passing
    through the interlock switch when the button for the interlock switch is depressed. With the
    power disconnected to the unit an ohm meter can be used to check if the interlock switch has
    continuity when the switch is depressed. The interlock switch has two sets of contacts that are
    individually switched and will not have continuity between the two separated contacts. If there
    is no continuity replace interlock switch as needed.
  3. With the unit on check to see if the power supply and motor are getting voltage. If the interlock
    is functioning properly and there is no power reading to the power supply or motor check wiring
    and replace the speed controller as needed.

INDICATOR LIGHT IS ON AND MOTOR DOES NOT CHANGE SPEED

  1. Adjust the speed controller fine adjustment. To get to the fine adjustment on the speed
    controller pull the knob off the speed controller and slide the silver plate behind the speed
    controller knob up (there is no fasteners holding the speed controller knob or the silver plate
    on). There is a small hole next to the main adjustment for the speed controller that you can
    insert a small screwdriver to adjust.
  2. If adjusting the fine adjustment does not change the fan speed replace the speed controller.

INDICATOR LIGHT IS ON, MOTOR RUNS, AND MIST / SMOKE IS COMING OUT THE EXHAUST

  1. Try reducing the speed of the motor to increase the amount of time the electrostatic cells have
    to collect the mist / smoke.
  2. If reducing the motor speed does not help and if the coolant selector is in the water soluble
    mode switch the selector switch to the oil mode while the unit is not filtering mist / smoke. If
    the light turns off or flashes when placed in the oil mode, go to the troubleshooting section for
    when the indicator light is constantly blinking and the motor runs. The reason for switching the
    selector into the oil mode is because in the water soluble mode the indicator light will not
    indicate a short in the collector side of the cell. (MB with a toggle coolant selector switch on the front will indicate a short in water or oil mode.)
  3. If the application that the unit was installed in has changed (i.e. higher coolant pressure, shorter cycle times, machine has changed, etc.) the unit might not be able to handle the increased load.

INDICATOR LIGHT IS ON, MOTOR RUNS, AND MIST / SMOKE IS NOT BEING EVACUATED / CAPTURED

  1. Make sure there are no obstructions in the ducting or the unit.
  2. Make sure there is proper airflow. If the unit is installed too close to openings on the machine
    cavity the unit will pull in fresh air from the opening and not move / draw into the unit from
    where the mist / smoke is being generated.
  3. If long lengths of ducting / tubing are used the airflow can be drastically reduced. The same
    issue can result when using ducting / tubing that has a very small diameter.

For additional assistance with troubleshooting or to order replacement parts, please contact
your local sales office or call 1-800-328-0787 for the manufacturer.

Air Quality Engineering

Air Quality Engineering