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We are Canada's largest manufacturer of vibratory feeder bowls and related

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VIBRATORY FEEDER BOWL - TUNING INSTRUCTIONS

When purchased without a feeder bowl, it is necessary to 'tune' the unit after the feeder bowl has been installed to obtain proper performance.To determine the tuning condition of a feeder bowl, the following steps should be followed:

       

  1. Gain access to the springs.
  2.    
  3. Check the air gap - it should not be less than .060" for this test.
  4.    
  5. Set the controller at '5' dial setting.
  6.    
  7. While observing, slightly loosen one of the spring clamp bolts and note the change of vibration:
  8. If the vibration decreases - the unit is under-tuned.Proceed as follows:
    An under-tuned unit is evident by a reduction of vibration when a material load is placed in the bowl. The spring system is not stiff enough. The condition can be corrected either by adding springs to the racks or replacing the present ones with thicker springs. A small change to the spring racks will show a significant change in vibration. Any alterations should be made in small increments. When changing or adding springs, ensure that a symmetrical pattern is maintained on the racks at all times. After each alteration, the air gap should be checked and adjusted if required.
    If the vibration increases - the unit is over-tuned.Proceed as follows:
    If the current exceeds the name-plate rating, the air gap should be checked and adjusted as per air gap instructions. With the air gap properly adjusted and the current within limitations, check the vibration. If the bowl speeds up excessively when bolt is loosened, it is over-tuned. Simply remove springs or replace with thinner ones, being sure to keep a symmetrical pattern on the racks at all times. After each alteration, the air gap should be checked and adjusted if required.

Air Gap Adjustments

The air gap should be set wide enough to prevent striking of the armature and coil faces under normal operation. At the same time, the air gap should be set close enough so the feeder bowl will not exceed its current limitations as stamped on the name plate. Note: Too close will cause striking, too much gap will heat up the coil and lower maximum speed of the feeder bowl. The rule is as close as possible without striking.To adjust the air gap: use a set of ignition feeler gauges to ensure consistent spacing across the coil face (for the bowl, .030" for non-rectified or .060" for rectified; for the hopper, .045" for the in-line, .050"). Never open the air gap more than necessary as an excessive air gap draws more current and reduces the power of the electromagnet resulting in poor performance.

TROUBLESHOOTING VIBRATORY FEEDER BOWLS

PROBLEM

POSSIBLE CAUSE

CORRECTION

UNIT HUMS BUT DOES NOT VIBRATE Defective controller

Controller not properly set

Replace.

Check to see controller is set properly for type of drive unit.

R.C. Units - "Half Wave / 60"

A.C. Units - "Full Wave /120"

UNIT STRIKING Air gap set too close

 

Adjust spacing as close as possible without striking under load. Ensure armature and core faces are parallel across entire area.
Bowl or inline too close together Move bowl back using the clearance in mounting feet of the bowl.
COIL HEATING UP - EXCESSIVE CURRENT DRAW Air gap set too wide

 

Under normal operation coil will run warm but NEVER too hot to touch. Adjust air gap closer but not too close as to cause striking.
  Improper tune on feeder bowl causing controller to be turned up too high Tune drive unit. (See Tuning Section)
UNIT DOES NOT OPERATE Lack of power supply to controller or between controller and unit.

Voltage and frequency not as per name plate.

Coil burned out or grounded.

 

Check wiring, fuses, loose components in Controller, etc.

Correct as required.


Check for magnetism using a thin scale between coil and striker plate - replace if defective.

or:

  High level track sensor blocked.

Clear interrupted signal.

Check for damaged sensor.

Check for dirty fibre optic sensor.

 

FEEDER BOWL OPERATING BELOW CAPACITY - FEED RATE LOW BUT SPEED O.K. Overloaded feeder bowl.


Worn out feeder bowl or worn "rate making" areas.


Incorrect manifold air pressure.


Orienting features not adjusted correctly.

"Rate making" air jets broken or position changed

See Operating and Installation Section.

Repair or replace as required. *Repairs should be performed by Crown.

Unless otherwise specified air pressure should be set at 50 psi.

Position properly and tighten.


Position properly or replace broken parts.

DECREASED FEEDER BOWL OUTPUT Low voltage.

Feeder bowl touching rigid surface.

Defective or dirty leaf springs.


Spring clamping bolts improperly torqued.

Feeder bowl or bowl mounting arm cracked

Unit improperly tuned

Air Gap set too wide

Orienting features altered or damaged

Bowl surface too smooth - eliminating friction needed to transfer parts

Repair as required.

Reposition correctly.


Clean or replace. (See Spring Replacement Section)

Ensure torqued to 140 inch-pounds.

Repair or replace as required.


Adjust to correct. (See Tuning Section)

Adjust to correct. (See Air Gap Adjustment Section)

Check for loose hardware and tighten. *Repairs should be performed by Crown.

Grind bowl tracks and bowl bottom. (Call Crown first before performing such repair)