Eriez HD-46 Manual

1
Vibratory Feeder: Models HD-46, HD-56, & HD-66
Installation, Operation
and Maintenance
Instructions
ERIEZ MAGNETICS HEADQUARTERS: 2200 ASBURY ROAD, ERIE, PA 16506–1402 U.S.A.
WORLD AUTHORITY IN SEPARATION TECHNOLOGIES
VM-3157G
VIBRATORY
FEEDERS
MODELS - HD-46,
HD-56, & HD-66

2
Introduction
This manual details the proper steps for installing,
operating and maintaining the Eriez Vibratory Feeder.
Careful attention to these requirements will assure
the most efficient and dependable performance of
this equipment.
If there are any questions or comments about the
manual, please call Eriez at 814/835-6000 for
Vibratory Feeder assistance.
©2019 ERIEZ MAGNETICS ALL RIGHTS RESERVED
CAUTION: Safety labels must be affixed to this
product. Should the safety label(s) be damaged,
dislodged or removed, contact Eriez for replacement.

3
Vibratory Feeder: Models HD-46, HD-56, & HD-66
Table of Contents
INSTALLATION ..................................................................................................... 4
Mounting.......................................................................................................... 4
Electrical Connections ..................................................................................... 4
OPERATION AND MAINTENANCE ...................................................................... 4
Tuning Guide ................................................................................................... 4
Tuning for Non-standard Trays........................................................................ 5
Tuning for Different Conditions of Tray Loading .............................................. 6
REPAIRS ............................................................................................................... 6
Coil Replacement ............................................................................................ 6
Spring Replacement ........................................................................................ 8
Armature Replacement.................................................................................... 9
TROUBLESHOOTING ........................................................................................ 11
ERIEZ VIBRATORY FEEDER - MODELS HD-46, HD-56 & HD-66

4
Installation
MOUNTING
This Hi-Vi model should be mounted on a flat surface,
fastened with bolts or screws of proper size. Use lock
washers under the bolt heads. Do not operate the unit with associated equipment
touching any part of the unit.
To start the feeder after all connections have been
made, apply power to the line connected to the feeder.
If a controller is used, operate the switch on the
controller and adjust the output voltage to maximum by
rotating the control knob to the full clockwise position.
Ordinarily (at ambient room temperatures) the unit
will take about two minutes to reach full steady-state
displacement.
After full steady-state displacement has been attained,
use the controller to adjust the unit to the desired feed
rate.
No routine maintenance or lubrication is required,
except that any accumulation of foreign matter should
be periodically removed from between the tray-tiebar
assembly and the body, and from between the body
and the mounting surface to prevent restriction of
movement of the vibratory elements.
IMPORTANT NOTE:
Special Trays and Attachments
Always consult Eriez before designing or constructing
special trays for your feeder drive. Also, contact Eriez
before modifying or attaching to any tray supplied by
Eriez. Changes made without Eriez’ prior approval will
void the warranty.
TUNING GUIDE
General Information
The tuning means is provided solely for the purpose
of mechanically tuning the unit, with its tray, to the
desired vibratory displacement at full voltage. When
a unit is furnished complete with tray, it is properly
tuned to the tray at the factory. Such tuning is naturally
somewhat different for trays of different size or weight.
Tuning is accomplished by changing the stiffness of
the tuning spring stacks of the feeder (see Figure 2).
Variations in stiffness are obtained by changing the
number of springs in the stacks and/or by changing
the thickness of fiberglass springs.
FIGURE 1
ELECTRICAL CONNECTIONS
NOTE: The Eriez Vibratory HD Feeder is designed
to be operated from an AC source through a special
Eriez 30Hz control (see IOM - 414). It cannot be
operated from a DC source.
All wiring should conform to all applicable
electrical codes.
1. Check the specifications of the power line to be
certain that they are the same as those shown on
the nameplate.
2. Connect the black and white wires in the feeder
power cord to the power source or to the proper
terminals in the control box.
3. Connect the green wire to the ground or to the lug
provided in the control box.
4. If using a control box, make all connections as
indicated on the control wiring diagram.
5. Connect the lug in the control box to a good earth
ground (a cold water line is excellent).
6. On multiple drive feeders (two or more drives on
one tray) all drives should be wired electrically in
phase and in parallel. The black wires from each
power cord should be connected together and the
white wires connected together. The black wires
should be connected to the line side of the input
voltage and the white wires should be connected
to the neutral side.
YOU ARE NOW READY TO START YOUR
VIBRATORY FEEDER.
Operation &
Maintenance

5
Vibratory Feeder: Models HD-46, HD-56, & HD-66
Deflection (Displacement)
HD units are normally set at approximately 3/16"
(4.7 mm) tray stroke. This can be checked with an Eriez
deflection sticker.
The sticker is read while the equipment is operating,
by looking at the optical illusion in which the printed
circles appear as double. Read the deflection where a
pair of circles just touch together.
A sticker is shown actual size in Figure 3B.
FIGURE 3B
The following general rules, which apply only to the
feeder operating ideally on the “normal” side of its
“tuning curve,” should be borne in mind when making
tuning adjustments to increase or decrease the
displacement:
1. To DECREASE the tray displacement,
DECREASE the stiffness of the tuning springs.
2. To INCREASE the tray displacement, INCREASE
the stiffness of the tuning springs.
If decreasing or increasing the tuning spring stiffness
has an opposite effect, it means that the spring
stiffness is great enough that the unit is operating
on the “opposite” side of its tuning curve. The spring
stiffness should be reduced until the behavior is in
accordance with rules 1 and 2. The unit can then be
properly tuned to the desired displacement.
As a guide to the stiffness of individual tuning springs,
each spring is marked with a code number, i.e., 5-27.
The first number (5) is the number of fiberglass plies
in the spring. The following number (27) indicates the
relative stiffness of the spring; the higher this number,
the stiffer the spring.
The total stiffness of the tuning spring stack is the
sum of the relative stiffness numbers. By various
combinations of different ply springs having different
relative stiffnesses, practically any desired total
stiffness can be obtained.
TUNING FOR NON-STANDARD TRAYS
(Note: See “Special Trays and Attachments”)
If it is necessary to tune the unit to an off-size or non-
standard tray, follow this procedure:
1. Attach the tray, making sure that all lockwashers
are in place and the fasteners tight.
2. Energize the unit at the nameplate voltage
and frequency.
TIE BAR REAR TUNING
SPRING STACK
FIGURE 2
In normal operation at full voltage, the total tray stroke
for standard size trays, measured at the back of the
tray is 3/16" (4.7 mm). For trays substantially larger
than standard, this normal displacement range should
be reduced. Refer to the serial number plate on your
feeder for the amplitude that your unit was tuned for.
How to Measure Displacement
Position an Eriez displacement sticker on the outer
side of the tray, near the rear of the tray and at an
angle of 25° from vertical (see Figure 3).
5/32"
3/16"
7/32"
This is how the circles
would look if the tray
deflection were
3/16" (4.7 mm)
1/8"
DISPLACEMENT STICKER
FIGURE 3

6
CAUTION: This unit contains Rare Earth Magnets.
Strong magnetic fields are present at assembly.
CAUTION - STRONG MAGNET
This equipment includes one or more extremely
powerful magnetic circuits. The magnetic field may
be much stronger than the Earth’s background
field at a distance several times the largest
dimension of the equipment.
• If you use a heart pacemaker or similar device
you must never approach the equipment
because your device may malfunction in the
magnetic field with consequences up to and
including death.
• To avoid serious pinch‑type injuries caused by
objects attracted to the magnet, keep all steel
and iron objects well away from the equipment.
Do not allow hands, fingers and other body
parts to be caught between the equipment and
nearby steel or iron objects.
• Keep credit cards, computer disks and
other magnetic storage devices away from
the equipment because magnetically stored
information may be corrupted by the
magnetic field.
• Keep electronic devices, such as computers
or monitors, away from the equipment because
exposure to the magnetic field may result
in malfunction or permanent damage to
such devices.
Contact Eriez if you have a question regarding
these precautions.
3. (a) During tuning, if a hammering or striking noise
occurs when the unit is turned off and on quickly,
the displacement is well in excess of normal.
Whether striking or not, if the displacement
exceeds the normal range for that particular size
of tray (see Tuning Guide-General Information),
it must be reduced by substituting a tuning spring
leaf or leaves of less stiffness, or by subtracting
one or more leaves, until approximately normal
full voltage displacement is attained. Then
use the controller for fine or variable control of
displacement and feed rate.
(b) During tuning if the displacement at full
voltage is below the nominal range for that
particular size tray, and greater displacement
is desired, increase the tuning spring stiffness
by substituting leaves of greater stiffness or by
adding more leaves.
TUNING FOR DIFFERENT CONDITIONS
OF TRAY LOADING
Units with Eriez-built trays are factory tuned for normal
displacement with light loading (light head load, light
materials, limited depth of flow of heavier materials).
Normal displacement for HD-46, HD-56 and HD66 is
approximately 3/16" (4.7 mm). Ordinarily this tuning
will not need to be changed. In no case, however,
should the unit be permitted to deflect more than 3/16"
(4.7 mm) without load for HD-46, HD-56 and HD-66.
CAUTION
A small amount of striking during tuning is
permissible, but must not be allowed during
regular operation since damage to the feeder
can result.
NOTE: The front spring stack always remains the
same on the feeder and should not be altered when
retuning the unit. The following applies:
FEEDER DRIVE ONLY (LESS TRAY SUPPLIED)
If a feeder is shipped without a tray, the standard
rear spring combination for the feeder is listed below.
These feeders will need to be tuned to the tray.
Refer to TUNING FOR NON-STANDARD TRAY section.
Repairs
HD-46
HD-56
HD-66
MODEL REAR SPRINGS/PLY FRONT SPRINGS/PLY
2-11 ply, 1-9 ply
4-11 ply
4-11 ply
(2) 11 ply
(2) 11 ply
(2) 11 ply
NOTE: Use 11 ply springs or they will fail
Operation &
Maintenance (cont.)
COIL REPLACEMENT
Refer to the Parts List Drawing and Figs. 4, 5, 6 & 7
The following procedure should be followed in
removing and replacing the electrical assembly, which
includes the coil:

7
Vibratory Feeder: Models HD-46, HD-56, & HD-66
1. Remove both nameplates and insert the two gap
spacers (furnished with the unit) between the
E-frame center leg and the two armature pole
pieces (see Figure 4 & 5).
GAP
SPACERS
FIGURE 4
FIGURE 5
AIR GAPS - ADJUST TO .093" (2.4 MM)
AIR GAP
HD-36 .203
HD-46 .25
HD-56 .25
HD-66 .25
FEEDER AIR GAPS
FIGURE 5
2. Remove, in order, the bolts securing (a) the
upper end of the rear tuning springstack to the
tiebar, (b) the lower ends of the spring lever
arms to the body housing, and (c) the lower end
of the tiebar to the spring bar. Lift the tray-tiebar-
lever assembly away from the body housing
(see Figure 6).
3. Remove the bolts securing the electrical
assembly to the body housing and lift the
assembly out of the body housing
(see Figure 7).
4. If the coil is defective, the entire E-frame
assembly including the coil must be replaced
(order from Eriez parts list).
5. In reassembling the unit, first center the armature
at the bottom of the body cavity; then insert the
E-frame into the body cavity, making sure that the
center leg enters the space between the armature
pole pieces. Insert the bolts securing the electrical
assembly and fasten only finger tight.
6. Place the tray-tiebar-lever assembly into its
original position and replace, in order, the bolts
securing (a) the lower end of the tiebar to the
spring bar, (b) the lower ends of the spring lever
arms to the body housing, and (c) the upper end
of the rear tuning spring stack to the tiebar. Make
sure that all tuning spring spacers are in place
and that all bolts are tight.
FIGURE 6
ELASTOMER SPRING
LEVER ARMS
FRONT
SPRING
STACK
TIE BAR
REAR
TUNING
SPRING
STACK
FIGURE 7
E-FRAME
ELECTRICAL
ASSEMBLY COIL
BODY HOUSING
SPRING
BAR
DIAPHRAGM
7. Loosen the electrical assembly bolts slightly and
roughly center the E-frame center leg between
the pole pieces. Insert the two spacers between
the E-frame center leg and the pole pieces
and adjust the electrical assembly forward or
backward until both spacers move freely in the
gaps. Tighten the electrical assembly plate and
replace the nameplates.

8
Repairs (cont.)
SPRING CHANGE OR REPLACEMENT
Refer to the Parts List Drawing and Figs. 8 & 9.
Although the non-metallic springs used in the feeder
have outstanding life characteristics, failure may
eventually occur, especially if the displacement is greater
than normal. The symptoms of such failure will be:
1. Erratic behavior of the unit, or
2. Greatly reduced displacement.
If spring failure is suspected, the rear tuning spring
stack should be removed after first inserting the two
gap spacers between the center leg of the E-frame
and the two pole pieces (Figure 8). The purpose of this
is to hold the tiebar or tray-tiebar assembly in position
while the tuning springs are removed.
If after inspection of the rear tuning spring stack,
the front stack is suspected, use the ARMATURE
REPLACEMENT procedure as a guide for re-assembly
with special attention to the washer shaped spacers
between the spring bar and armature.
Carefully examine each tuning spring for signs of
delamination or breakage, especially in the area next to
the spring shims. A failed spring can be recognized by
the appearance of the spring surface. If this surface is
discolored or has a patchy whitish appearance, perhaps
accompanied by surface burying or other irregularity, the
spring is defective and should be replaced with a new
spring ordered from the parts list.
If the feeder still exhibits signs of spring malfunction
after the tuning spring has been checked and
replaced, check the two cylindrical elastomer springs
after first inserting the two gap spacers, then removing
the spring lever arms, and finally removing the
elastomer springs in the following manner:
1. Lay the unit on its side, making sure that the gap
spacers stay in place, and use a small hammer
and flattened round bar or dowel to tap the
elastomer spring out of the body housing. Next,
support the tiebar with a small block between the
tiebar and work surface and tap the spring out of
the tiebar.
2. Carefully examine both springs for signs of failure
and replace if such signs are found. A failed
spring will exhibit one or more of the following
characteristics:
(a) Looseness of the spring combined with
signs of rubbing or abrasion at the outer
surface of the cylinder. Looseness of the
metal sleeve.
(b) Small crack in the elastomer around the
end of the metal sleeve, possibly with small
abraded particles of the elastomer present.
(c) Tackiness of the elastomer around the
metal sleeve and at the outer surface of the
cylinder, possibly with some outward
bulging of the elastomer.
3. In replacing the elastomer springs, lay the unit on
its side so that the chamfered ends of the spring
holes are up. After making sure that the holes
and their chamfered ends are clean and free from
obstructions, lubricate the elastomer spring with
a solution of water and 10% of liquid dishwasher
soap (never use a petroleum or silicone lubricant)
and press them partly into place with the thumbs.
Then tap the springs 1/16"-1/8" past center, then
back into place, again using the small supporting
block between tiebar and work surface. Make
sure that the springs go in straight and protrude
equally at both ends of both spring holes (see
Figure 9).
FIGURE 8
GAP SPACER
REAR TUNING
SPRING STACK
FIGURE 9
ELASTOMER SPRING
LEVER ARMS
ELASTOMER
SPRINGS
GAP SPACERS

9
Vibratory Feeder: Models HD-46, HD-56, & HD-66
4. Replace the lever arms, tightening the two
fastening bolts securely, and remove the two
gap spacers. If a new elastomer spring has been
installed, it may be necessary to retune the
feeder. See Tuning Guide.
CAUTION
Make sure that all of the fasteners in the assembly
are tight or torqued to spec at all times. Periodic
checks for tightness should be made to insure
against possible malfunction or damage due to
loose parts.
TABLE 1. TORQUE CHART
46 & 56 Series
Part Bolt Torque
Size m-kgs ft-lbs
Rear Spring Bolts M14-2 11.8 85.3
Front Tie Bar Bolts M14-2 11.8 85.3
Front Spring Bolt M14-2 11.8 85.3
Electrical Ass’y Bolts M8-1.25 2.4 17.4
Tray Mounting Bolts M8-1.25 3.0 22
66 Series
Part Bolt Torque
Size m-kgs ft-lbs
Rear Spring Bolts M16-2 15.2 109.9
Front Tie Bar Bolts M16-2 15.2 109.9
Front Spring Bolt M16-2 15.2 109.9
Electrical Ass’y Bolts M8-1.25 2.4 17.4
Tray Mounting Bolt M12-1.75 7.4 53.5
3. Loosen the bolts securing the lower end of the
spring stacks to the body housing leaving 1-2
threads in the body housing. Carefully slide the
spring stack and the armature assembly back
to the bolt heads and remove the bolts from the
body housing. (Do not remove bolts from the
spring stacks).
4. Remove the armature and spring stack assembly
by grasping the spring stacks and sliding it
through the opening in the body housing. NOTE:
Use a downward pressure when removing this
assembly to keep the magnetic poles of the
armature from coming in contact with the body
housing when going through the opening.
5. Stand the armature and spring stack assembly
on a non-magnetic surface (i.e. wooden table)
as shown in Figure 9. NOTE: Keep armature
away from any steel parts and surfaces.
6. Loosen the bolts securing the spring stacks to the
armature and remove the spring stacks with the
bolts intact. Retain the washer shaped spacers
located between spring bar and armature.
Note the position of the elastomer diaphragm
when reassembling.
7. Center washer shaped spacers on tapped holes
of the armature. (Hint: sing an instant adhesive
will keep the washers and elastomer diaphragm
in position while reassembling) and position
elastomer diaphragm on the armature as shown
in Figure 10. Reverse the above procedure to
reassemble the unit.
8. Insert armature and diaphram assembly through
opening in front of base casting as shown
in Figure 11.
ARMATURE REPLACEMENT
Refer to the Parts List Drawing and Figs. 4, 5, 6 & 7.
CAUTION: This unit contains Rare Earth Magnets.
Strong magnetic fields are present at assembly.
Prolonged striking may damage the armature to an
extent that it will have to be replaced. If this should
become necessary, order a new armature from the
parts list and begin replacement by following the same
instructions as for coil replacement.
1. Continue by removing in order the bolts securing
the elastomer diaphragm clamp to the body
housing.
2. Loosen slightly but do not remove the upper end
of the front tuning spring stacks to the spring bar
and the spring bar to the armature. FIGURE 11
FIGURE 9 FIGURE 10

10
Final assembly as follows:
• CheckthattheelectricalE-frameand
armature assemblies are positioned with gap
bars provided. (Hand tight).
• Attachthetiebartotherearofthebody
housing using the existing rear tuning spring
stack and bolts. (Tighten).
• Attachleverarmassembly.(Handtight).
• Connectthetiebartothefrontofthearmature
adapter. (Torque - see Table 1).
• Checkclearances.(Gapbars).
• Tightenfrontspringstack.
(Torque - see Table 1).
• Tightenrearspringstack.
(Torque - see Table 1).
• TightenelectricalE-frameassembly.(Torque-
see Table 1).
• Tightenleverarmassembly.
(Torque - see Table 1).
• Checkallfasteners.
(Check torque - see Table 1).
THE HI-VI MAGNETIC DRIVE CIRCUIT
(RARE EARTH)
Old-style electromagnetic equipment has an inefficient
attract-release type operation, where a mass mounted
on springs is attracted by a DC electromagnet and
returned to its original position solely by the springs.
The new Hi-Vi method incorporates a lifetime
permanent rare earth magnet and is operated directly
from an alternating current line through Eriez 30/40 Hz
control.
In the Hi-Vi method, the spring-mounted mass is
alternately both attracted and repelled by an AC
electromagnet assisted by the springs.
Intermeshing a fixed polarity permanent magnet with
an alternating polarity AC electromagnet eliminates the
rectifier since you would have an alternating attracting
and repelling force as the polarity of the electromagnet
alternated.
It will be noted that the pole pieces of the permanent
magnet are intermeshed in the air gaps of an
electromagnet. The polarity of the permanent magnet
is fixed; the polarity of the electromagnet alternates at
the line frequency. We have shown the polarity of the
electromagnet as it would exist on one side of the sine
wave. Note that both poles of the permanent magnet
are being attracted toward the unlike electromagnet
poles. They are also being repelled in the same
direction by the like electromagnet poles. This results
in four forces accumulating to drive the armature in the
same direction. It also results in closing the magnetic
circuit through the electromagnet, providing a
magnetizing effect on the permanent magnet on each
side of the sine wave. The demagnetizing force is very
minor for the attracting force and the magnetic lines of
flux would much prefer to be attracted than repelled.
This always tends to place the permanent magnet
in a magnetizing circuit regardless of where the AC
current is on the sine wave. As the polarity of the
electromagnet changes, all of the forces are reversed
and the permanent magnet armature is driven in the
opposite direction.
CAUTION: Operation from portable engine driven
power plants.
Varying and unstable line frequency has a diverse
effect on vibratory feeders because they are tuned
mechanical devices, designed for 30/40 cycle
operating frequency. Shifts in the operating point due
to changes in frequency, (greater than + - 1Hz) can
cause higher than normal spring stress, striking and
high line currents which can cause drive and tray
failure. When operating from portable engine-driven
power plants, be certain that the engine is up to speed
and all other loads are started and at running speed
before starting the electromagnet feeder.
The feeder should always be stopped first when the
engine-driven power plant is shut down.
Repairs (cont.)
NS NNS
AC
POWER
SUPPLY
POTENTIOMETER
ELECTRO-MAGNET
ARMATURE CONNECTED
TO SPRINGS AND
MOVING MASS
PERMANENT
MAGNET
FIGURE 10

11
Vibratory Feeder: Models HD-46, HD-56, & HD-66
Reduced or Low 1 2 5 6 7 8 9 11 13 14 16 19
Output
Noisy but Output 2 3 8 9 10 11 12 13
Okay
Noisy Certain 11 13 14
Periods Only
Completely 2 4 5 7 13 15 16
Inoperative
Operating But 2 3 5 6 7 8 9 10 11 12 13 14 16 17 19
Reduced Output
Output Okay 2 7 8 9 10 11 12 13 14
Too Much Noise
Gradual
Fading 5 7 8 9 10 13 19
Excessive
18
Tray Wear
Turbulent 10 11 14 17
Flow
Inconsistent 2 3 5 6 7 9 10 11 12 13 14 16 17 19
Output
Develop After Satisfactory Initial
Initial Operation Installation
Misapplication Tampering or Changing of Base or Tray Loose Spring Clamp or Tray Mounting Bolts Coil Failure Control Failure Incorrect Voltage Spring Failure Foreign Material Between Tray & Reaction Mass Incorrect Tuning Poor or Broken Weld on Tray Incorrect Factory Adjustment Sympathetic Vibration in Other Equipment In Contact with Other Equipment Line Voltage or Hz Variation Blown Fuse or Circuit Breaker Other Electrical Connections Shockmount Deterioration Corrosive or Abrasive Material Product Variation
NATURE OF
PROBLEM
TABLE 2. SERVICE CHART
Troubleshooting
1. Misapplication
Feeder too small. Product difficult or impossible to
handle. Impossible temperatures or atmospheres.
Impossible dimensional requirements. Feeding
requirements too precise or excessive. Consult Eriez.
2. Tampering or Changing of Base or Tray
Improper disassembly, extensions, covers, weights,
screens or other modifications or attachments
may have affected performance. Reassemble in
accordance with printed instructions or consult Eriez.
3. Loose Spring Clamp or Tray Mounting Bolts
Tighten all bolts.
4. Coil Failure
Replace coil or coil and E-frame assembly.
Order from Eriez parts lists. Follow maintenance
instructions carefully.
5. Control Failure
Check for burned out powerstat or rheostat,
defective capacitor, defective switch, loose wiring,
defective transformer (if used). Order new parts
from Eriez. Possibility special control needed.
Consult Engineering.
6. Incorrect voltage
Check nameplate specifications and line voltage.
7. Spring Failure
See maintenance instructions. Disassemble for
examination. Tuning spring failure will show up
as white areas. Order new parts from factory and
replace per instructions.
8. Foreign Material
Examine and remove foreign material.

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   
9. Incorrect Tuning
See maintenance instructions. To decrease
displacement and output and eliminate striking,
use fewer or thinner tuning springs. To increase
displacement, use more or thicker tuning springs.
10. Poor or Broken Weld on Tray
Check and correct.
11. Incorrect Factory Adjustment
See maintenance instructions.
(Gap adjustments.)
12. Sympathetic Vibration in Other Equipment
Check and correct.
13. Contact with Other Equipment
Check and correct.
14. Line Voltage or Hz Variation
Check and install voltage regulator if necessary.
Check Hz on output side of control. Adjust back to
30 Hz per control manual. 40 Hz for the HD-36.
15. Blown Fuse or Circuit Breaker
Check for short circuits and correct.
16. Other Electrical Connections
Check all connections and correct.
17. Shockmount Deterioration
Check and correct.
18. Corrosive or Abrasive Material
May require special tray. Consult Eriez.
19. Product Variation
If product density, moisture content or other
characteristics vary, customer should take own
corrective measures.
Troubleshooting (cont.)