$30.00
Operation and Installation Manual
Model BP1620, BP1628, & BP1640
Granulators
Important! Read Carefully Before Attempting to Install or Operate Equipment
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Safety Considerations
Sterling granulators are designed to provide safe and
reliable operation when installed and operated within
design specifications, following national and local safety
codes.
To avoid possible personal injury or equipment damage
when installing, operating, or maintaining this granulator,
use good judgment and follow these safe practices:
X LEARN AND OBEY your company’s safety policy
regarding granulating equipment.
X MOVING OR LIFTING THE GRANULATOR:
Although our equipment is built and engineered for
great ruggedness in operation, care must be taken when
moving the machine along the floor or lifting it.
Damage may occur to sheet metal covers, electrical
cabinets, or small brackets if pressure is applied to
them when moving the granulator. When lifting the
granulator, be certain of total machine weight and the
capability of the lifting equipment (see the Granulator
Specification Sheets for machine weights and
dimensions).
X GRANULATOR LOCATION: Adequate area for
routine maintenance should be provided in order to
open the machine for knife, screen, or cleanout service.
Proper service area clearances also should allow
people who are working on the machine to be clearly
visible to others, thereby reducing the potential safety
hazards.
X SAFE HOUSEKEEPING: The work area must be
kept clean and uncluttered to allow personnel safe
movement around the granulator during periods of
operation or maintenance. No hand tools or other
metal objects should be left on or about the machine.
Any tools or other metal objects which mistakenly fall
into the hopper feed opening can cause severe damage
BP1620, BP1628 & BP1640 Granulators
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to internal cutting chamber and screen chamber
components.
X SAFETY GLASSES OR A FACE SHIELD MUST
ALWAYS BE WORN when servicing or operating
the machine. Although our machines are designed for
the maximum in flyback control, caution must be used
when operating near the area of the hopper feed
opening in order to guard against unexpected material
flyback.
X EAR PROTECTION may be required when
operating the machine during granulation or very
hard/noisy materials. The Occupational Safety and
Health Act of 1970 has established guidelines for
Permissible Noise Exposures (OSHA 1910.95) that
should be followed.
X NEVER attempt to operate the granulator unless it is
fully assembled with all guards and interlocks in place
and functional.
X OBSERVE all danger, warning, caution and safety
labels on the equipment.
X Upon completion of any machine maintenance, be
certain ALL SAFETY GUARDS AND COVERS are
securely and properly fastened prior to resuming
machine operation. All fasteners must be in place and
properly tightened. ANY SHORTCUTS MAY
RESULT IN INJURY TO PERSONNEL OR
DAMAGE TO EQUIPMENT.
X NEVER wear any loose fitting clothes, neckties, or
dangling items such as earrings, belts or shoestrings.
Jewelry such as wristwatches, bracelets, or rings
should NEVER be worn. Long hair must be tied back
or placed in a tight fitting hairnet. NEVER lean
against or rest hands/feet on the granulator when it is
in operation or open for maintenance. NEVER stand
on the granulator when it is in operation.
X ROTATION OF MOTORS: All rotating items in the
granulator are clearly marked on the machine. Always
check for proper rotation of motors.
X ELECTRICAL GROUNDING: All electrical
equipment on the granulator must be grounded in
accordance to all local codes and Article 250 of the
National Electric Code.
BP1620, BP1628 & BP1640 Granulators
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X ALWAYS DISCONNECT AND LOCKOUT THE
MAIN ELECTRICAL POWER TO THE
GRANULATOR BEFORE PERFORMING ANY
SERVICE.
X SAFETY INTERLOCKS MUST NOT BE
BYPASSED. The mechanical and electrical safety
interlocks ensure the safety of personnel. They should
never be tampered with or removed for ANY reason.
They should be frequently checked by a qualified
mechanic for proper operation.
X NEVER modify the machine configuration or any
individual component without written consent from
Sterling.
For further information on granulator safety, installation, and operation, see the American
National Standard for Plastics Machinery - Granulators, Pelletizers, And Dicers Used
For Size Reduction of Plastics - Construction, Care, and Use. ANSI B151.11-1982.
Sterling has long recognized the importance of safety and has designed and manufactured
it’s equipment with operator safety as a prime consideration. As a user, we expect you
will abide by the foregoing recommendations in order to make operator safety a reality.
SAFETY IS NO ACCIDENT
BP1620, BP1628 & BP1640 Granulators
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Table of Contents
1 General Information
9
1-1 Introduction
9
1-2 General Description
1-3 Granulator Specifications
10
11
2 Shipping Information
12
2-1 Unpacking and Inspection
2-2 In the Event of Shipping Damages
2-3 If the Shipment is Not Complete
2-4 If the Shipment is Not Correct
2-5 Returns
12
12
13
13
13
14
2-6 Uncrating
3 Installation
15
3-1 Scope
15
15
15
17
18
3-2 General
3-3 Set-up
3-4 Electrical Service Connections
3-5 High Amperage Readings
4 Accessing Cutting Chamber
19
19
19
4-1 Opening Cutting Chamber
4-2 Closing Cutting Chamber
5 Accessing Screen Chamber
20
20
21
5-1 Opening Screen Chamber
5-2 Closing Screen Chamber
6 Sequence of Operation
22
22
22
6-1 Scope
6-2 Electrical Test
BP1620, BP1628 & BP1640 Granulators
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Table of Contents
7 Startup Checklist
24
7-1 Introduction
24
24
7-2 Fan Evacuation
7-3 Granulator Startup Checklist
24
8 Operation
26
26
26
26
27
8-1 Operation Instructions
8-2 Temporary Machine Stops
8-3 Final Machine Stops
8-4 Emergency Stops
9 Routine Maintenance
28
9-1 Lubrication Specifications
9-1-1 Description
28
28
29
29
32
33
34
38
35
36
38
38
9-1-2 Screw Jack Lubrication Instructions
9-2 Motor & Belts Servicing
9-3 Knife Removal & Adjustment
9-4 Rotor Knife Removal
9-5 Rotor Knife Sharpening
9-6 Rotor Knife Installation
9-7 Bed Knife Sharpening
9-8 Bed Knife Installation & Setting
9-9 Preventative Maintenance Service
9-10 Recommended Torque For Knife Bolts
10 Troubleshooting
11 Spare Parts
39
42
42
43
12-1 Recommended Spare Parts
12-2 Additional Parts
BP1620, BP1628 & BP1640 Granulators
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Charts and Figures
Granulator Specifications Table
1
2
3
11-12
Granulator Dimensions
Belt Span and Deflection
33-34
36
Belt Deflection Force Table
Rotor Knife Drawings
4
37
Recommended Knife Replacement Blades
5
39
Bed Knife Drawings
6
41
Recommended Bolt Torque
7
46
General Drawings
BP1620, BP1628 & BP1640 Granulators
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1
General Information
1-1 Introduction
This manual is intended to be used as a guide and reference
for personnel who will be installing, operating, and
maintaining the Sterling BP1600 Series Granulator. The
purpose is to aid these individuals in applying efficient,
proven techniques, which will enhance productivity.
This Introduction includes a brief functional description, a
physical description, and machine specifications for these
granulators. Additional sections within the manual provide
instructions for installation, pre-operation, preventative
maintenance, and corrective maintenance.
Section 2, Shipping Information, includes all required data
for receiving, unpacking & inspecting the granulator.
Section 3, Installation, provides information on the proper
setup of the granulator. Also included are illustrations,
which will aid in utilizing techniques to accomplish these
tasks efficiently. We can provide the assistance of a factory
trained technician, for a nominal charge, who will help in
training your operator(s).
Pre-operation Instructions include procedures, checks, and
adjustments, which should be followed before commencing
with operation of the granulator. These instructions are
intended to supplement standard shop procedures performed
at shift, daily, and weekly intervals.
The Troubleshooting Section is intended to serve both as a
guide for identification and location of most common
problems and as a source of detailed assembly and
disassembly instructions for those areas of the equipment
requiring service.
The Spare Parts Section contains a partial list of
recommended parts, which may require replacement. Refer
to the Spare Parts Manual for a comprehensive listing of
components, which can be purchased.
BP1620, BP1628 & BP1640 Granulators
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1-2 General Description
Sterling granulators are designed to uniformly and
consistently size reduce your scrap. They have been
engineered to consistently deliver clean granulate with a
minimum of “fines”.
The rotor, on which the cutting knives are mounted, is a
fabricated steel unit supported by bearings mounted outside
the cutting chamber. A motor drives the rotor, which is
capable of producing high torque loads. The granulator is
equipped with a magnetic starter that is protected by
manually resettable overload heaters. The slanted rotor
knives produce a scissors cutting action which reduce the
possibility of feedstock jamming in the cutting chamber.
Motors are individually fused for maximum protection in
compliance with the National Electric Code.
The control enclosure houses all of the necessary wiring,
fuses, overload heaters, motor starter coils, along with the
115V control transformer and granulator operating controls.
The control enclosure is built to meet NEC, JIC (M.T.), and
ANSI-B regulations.
BP1620, BP1628 & BP1640 Granulators
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1-3 Granulator Specifications
Figure 1
Granulator Dimensions
Model
BP1620
BP1628
“A” Dimension
Weight
Est. Throughput
51.25” (1301.8 mm)
3025 lbs (1372 kg)
900 lbs/hr (408 kg/hr)
59.25” (1505 mm)
3400 lbs (1542.3 kg)
1500 lbs/hr (680 kg/hr)
BP1620, BP1628 & BP1640 Granulators
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2
Shipping Information
2-1 Unpacking and Inspection
You should inspect your Sterling BP1600 Series granulator
for possible shipping damage. If the container and packing
materials are in re-usable condition, save them for
reshipment if necessary.
Thoroughly check the equipment for any damage that might
have occurred in transit. In case of breakage, damage,
shortage, or incorrect shipment refer to the following
sections.
2-2 In the Event of Shipping Damages
Important!
According to the contract terms and conditions of the Carrier,
the responsibility of the Shipper ends at the time and place of shipment.
X Notify the transportation company’s local agent if you
discover damage.
X Hold the damaged goods and packing material for the
examining agent’s inspection. Do not return any goods
to Sterling before the transportation company
inspection and authorization.
X File a claim against the transportation company.
Substantiate the claim by referring to the agent’s report.
A certified copy of our invoice is available upon
request. If the shipment was prepaid, call us for a
receipted transportation bill.
X Advise Sterling regarding your wish for assistance and
to obtain an RMA (return material authorization)
number.
BP1620, BP1628 & BP1640 Granulators
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2-3 If the Shipment is Not Complete
Check the packing list. You should have:
X Sterling BP1600 Series granulator
X Bill of lading for equipment shipped
X Operating and Installation packet
X Electrical schematic and panel layout drawings
Re-inspect the container and packing material to see if you
missed any smaller items during unpacking. Determine that
the item was not inadvertently taken from the area before
you checked in the shipment. Notify Sterling immediately
of the shortage.
2-4 If the Shipment is Not Correct
If the shipment is not what you ordered, contact the
Sterling shipping department immediately. For
shipments in the United States and Canada, call 1 (800)
229-2919; for all other countries, call our international desk
at (508) 399-6400. Have the order number and item
number available.
Hold the items until you receive shipping instructions.
2-5 Returns
Important!
Do not return any damaged or incorrect items
until you receive shipping instructions from Sterling.
BP1620, BP1628 & BP1640 Granulators
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2-6 Uncrating
BP1600 Series Granulator
BP1600 Series granulators are shipped mounted on a wooden
skid then blocked and banded to prevent movement. All non-
painted items subject to corrosion are coated with a quality rust
preventative and the machine is then covered with heavy duty
polyethylene to protect it from moisture and dirt.
Sterling granulators are normally shipped completely
assembled unless the size of the machine or an agreement for
special shipping arrangements causes partial disassembly.
If inspection revealed no shipping damage, unpack the unit by
removing the polyethylene covering and banding. For detailed
uncrating information, follow the instructions listed below:
1. Remove the nails holding the box to the skid and lift the
box off carefully, avoiding staples in the 1’ x 4’ wood
supports. Cut steel banding.
2. Use a pry bar to remove the blocks securing the unit to the
skid.
3. Insert forks between skid and granulator from the side
(guard side) until they protrude beyond the opposite side
of the unit. The forks must be equidistant from the
centerline of the unit and the unit must be balanced on the
forks.
4. Lift the unit off the skid with a fork truck. Lift slowly and
only high enough to clear the skid. Use a pry bar if
necessary to carefully remove the skid from the unit.
5. Lower slowly. The unit should land on its foot pads or
optional casters and can then be moved into position.
6. Temporary hardware has been installed to prevent side
panels from shifting in transit. Remove hardware.
Important!
Retain the crating material for reshipping the granulator in case hidden
shipping damage is found.
- Notes-
BP1620, BP1628 & BP1640 Granulators
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3
Installation
3-1 Scope
This section contains all instructions required for
experienced installation personnel to install the Sterling
granulator and prepare it for production. It is essential to
follow all instructions carefully and in the sequence
presented. Be sure to observe all DANGER, WARNING,
and CAUTION statements in order to prevent personal
injury or machine damage, and to observe all NOTE
statements which are designed to assist in the performance
of procedures.
3-2 General
3-3 Set-up
The site selected for installation of the granulator should be
prepared in advance. Be certain that the area to be
occupied by the machine is clean, level and free of
obstructions. The site selected must have a floor rated to
easily support the weight of the machine. A concrete floor
of 4” minimum in thickness is recommended.
Make certain the floor is clean, level, and free of
obstructions before placing the machine into position.
Visually inspect the hopper infeed opening to insure that no
stray packing material or debris are present.
BP1620, BP1628 & BP1640 Granulators
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Fastener (turn
counter-clockwise to
loosen)
Loosen the fastener in the right side front door. Note that
this fastener does not need to be completely removed from
the front access door, as it is designed to be captive for
convenience.
NOTE: DO NOT USE ANY OTHER MEANS TO CRANK
OPEN THE MACHINE OTHER THAN THE HAND
CRANK PROVIDED. Using other methods of turning
the jack could result in damage to the unit.
Hand Crank (RH
Side of Machine)
Rotate the hand crank clockwise to open the cutting
chamber approximately 90o (For more information on
opening the cutting chamber refer to Section 4).
BP1620, BP1628 & BP1640 Granulators
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CAUTION!
The knives mounted on the rotor and also located at the front and rear of the
cutting chamber are extremely sharp. Always wear heavy gloves and exercise
care when working in the cutting chamber.
Wipe out the inside of the hopper and upper cutting
chamber. Carefully inspect the interior of the cutting
chamber for foreign material or debris. Slowly turn the
rotor by hand to verify that it rotates freely and without
obstruction or contact between the rotor and bed knives.
Before closing the cutting chamber, check the chamber to
insure that nothing has been left inside the machine. Rotate
the hand crank counter-clockwise until the cutting chamber
is fully closed. Remove the discharge transition or bin, by
sliding out from under the screen chamber..
Lower the screen chamber until it comes to rest
Remove the screens and place them on their side. Wipe out
the screen chamber and transition. Once cleaned, place the
screen back into position. Raise the screen chamber and
tighten the fasteners to hold the screen chamber and cutting
chamber securely closed. Connect the fan transition
(optional) or replace the bin to prepare the machine for
operation. Position and connect any optional accessory
equipment such as fans, conveyors, and separators. Ensure
all tubing joints are securely clamped and supported.
Make certain all electrical connections are properly made
and supported between accessories and the control
enclosure. (Refer to the wiring diagrams for wire and
terminal connections.)
Open the sheave guard (LH) by removing the fasteners
attaching the cover. Check the belts for proper tension and
alignment (refer to Section 9-2). Upon completion, close
the sheave guard by placing the cover back into position,
insert all of the fasteners originally removed, and tighten
them fully.
3-4 Electrical Service Connections
Carefully check the diagrams packed with the machine. All
internal wiring has been done at the factory and safety
BP1620, BP1628 & BP1640 Granulators
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interlocks have been verified for proper functioning before
shipment. It is only necessary to connect the electrical
power source to the machine at the control enclosure.
WARNING!
All equipment must be grounded in compliance with Article 250 of the National
Electric Code. The customer’s disconnecting means and branch circuit
protection must also be in compliance with the National Electric Code and all
Local Codes.
3-5 High Amperage Readings
NOTE: Make sure the granulator is not drawing excessive
amperage during operation.
1. Check appropriate amperage as listed on the motor
nameplate.
2. Measure amperage with ammeter by connecting
ammeter to incoming power feed wires. Make sure
machine is not drawing more than amperage listed on
the nameplate. The amperage will change according to
motor size.
3. If amperage exceeds the amount listed on nameplate,
check the following:
•
•
Sharpness of knives
Quoted feed rate of granulator
TYPE KM
HP
FRAME
AMPS
PH3
HZ60
SERVICE
FACTOR
NEMA
CODE
TEMP
RISE
LOW VOLTAGE LINE
VOLTS
RPM
•
•
•
Amperage
230/460
208
4
5
6
May not meet NEMA
torque on 208V systems
Y
BEARINGS DRIVE/OPP
NEMA
NEMA
NOM. EFF.
MAX
AMB INS
B
DESIGN
CONT
SERIAL
TV
HIGH VOLTAGE LINE
@
AC Motor
DUTY
MADE IN USA
BP1620, BP1628 & BP1640 Granulators
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4
Accessing Cutting Chamber
4-1 Opening Cutting Chamber
1. Allow material to run out of the cutting chamber.
2. Shut OFF and LOCKOUT all power, including the main
disconnect switch.
3. Release latch that holds (2) front doors closed. Loosen the
handle (knob) on the front right hand door. This hand-knob
when fully loosened stays captive to the door.
4. Loosen fasteners on front of machine. They are designed to
remain with the upper screen chamber.
5. Rotate handle (right side of machine) clockwise to open the
cutting chamber
WARNING!
DO NOT USE ANY OTHER MEANS TO CRANK OPEN THE MACHINE OTHER
THAN THE HAND CRANK PROVIDED. Using other methods of turning the jack will
result in damage to the unit.
NOTE: The cutting chamber is designed to open 90o to access the
knives, but can be left open at any position on the way up
depending on the reason for opening. The jack screw is a
self-locking acme screw that will not back travel.
CAUTION!
New or resharpened knives should be handled with extreme care. It is
suggested that the sharp cutting edges be covered with tape to prevent damage
to the knives or injury to personnel during installation.
4-2 Closing Cutting Chamber
1. Double check the cutting chamber area for tools, rags, and
other debris left in the area.
2. Rotate the crank handle counterclockwise to close..
3. Raise screen cradle and tighten the fasteners.
4. Close and latch the (2) front doors. Tighten the hand knob
on the right side door.
5.
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5
Accessing Screen Chamber
5-1 Opening Screen Chamber
1. Allow all material to run out of the cutting chamber and
screen chamber.
2. Shut OFF and LOCKOUT all power including the main
disconnect switch.
3. Remove discharge chute located below the screen chamber.
2 fasteners holding
the screen cradle in
position.
Hopper (Located under
screen chamber.)
4. Loosen (2) fasteners holding the screen cradle in position.
As the fasteners are designed to remain with the screen
chamber, it is not necessary to totally remove them from the
screen chamber.
5. Guide the screen chamber to it’s resting position.
Screen
Screen chamber in
resting position.
BP1620, BP1628 & BP1640 Granulators
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WARNING!
DO NOT LET THE SCREEN CHAMBER DROP!! Guide cradle to it’s resting
position.
6. Remove the screen(s) and place them upright on their side.
CAUTION!
The knives mounted on the rotor, and the bed knives located at the edges of the
cutting chamber, are extremely sharp. Always wear heavy gloves and exercise
care when working in the cutting chamber.
5-2 Closing Screen Chamber
1. Ensure all tools, screws, and debris is removed from the
inside of the screen chamber.
2. Place the screen back into its original position, ensuring it
is fully seated within the cradle, then CAREFULLY raise
the chamber to its closed position. Tighten the captive
screws.
3. Insert hopper into the two clips located on either side of the
unit walls (see photo).
Discharge should be
inserted into these
clips located on either
side of the unit.
4. Before leaving the area, make sure all components are
connected properly.
5. Replace access cover and close doors on optional
enclosures.
BP1620, BP1628 & BP1640 Granulators
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6
Sequence of Operation
6-1 Scope
This section contains the information required to carry out pre-
operational procedures, and the checklist of items, which
should always be reviewed prior to a production run.
DANGER!
Before undertaking any machine repairs or maintenance, always make certain that
the machine disconnect switch is turned to the OFF position or that the control
enclosure is disconnected from the main power source. Lock out all sources of
power including the main disconnect switch and follow all of your plant lockout
procedures.
6-2 Electrical Test
Before applying power to the machine, check the incoming
voltage from L1 to L2, L2 to L3, and L1 to L3 (see the wiring
diagram packed with the machine). The voltage should be the
same as indicated on the silver tag in the control enclosure. If
the voltage is not the same, contact Sterling for voltage
modification instructions at 1 (800) 229-2919.
Once it has been determined the voltages are proper, it is
necessary to start the motors and check for the proper direction
of rotation.
• Turn the main disconnect switch to the ON position.
• Press the granulator start pushbutton to power the
granulator motor. Visually compare the direction of the
motor shaft rotation to the rotation arrow label
(clockwise when viewed from the shaft end). If the
motor turns in the opposite direction, reverse any two
incoming power leads.
Once the rotation direction is correct, the remaining electrical
controls need to be tested as follows:
• Press the granulator stop pushbutton and allow the
machine to stop.
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• For granulators equipped with conveyors, fans, etc., test
their operation also by pressing the appropriate
pushbutton. Check fan outlets for proper airflow.
• For granulators with emergency stop pushbuttons, test
the buttons to insure all motion stops.
• With the granulator running, loosen the handknob on the
front access doors and screen chamber to verify the
safety interlock switch shuts the machine off. If the hand
knob is completely loose and the power does not
disconnect, the interlock switch is not working and the
cause of the malfunction must be determined.
Alternate Procedure for testing interlock switch operation
1. Depress the stop/start push button to shut down the granulator
2. Disconnect and lockout the main power supply to the granulator as required by
OSHA’s Lockout/Tag out requirements.
3. Using the wiring diagram supplied with your granulator or by tracing the wires
from the interlock switches, locate the interlock switch wire numbers on the
terminal strip in the control panel. They will usually be marked #1 & #3, #3 & #4
and #4 & #5 etc. depending on how many switches are used on your machine.
4. Connect the leads of and ohm meter across each interlock switch or across all
interlock switches (wires #1 and #5). Set the ohm meter on the lowest resistance
scale. When the interlock actuator bolts are in place and properly activating the
switch, the ohm meter will read zero resistance.
5. Loosen the actuator bolt of each interlock switch (usually about 3 or 4 turns) one
at a time, until the ohm meter reads infinite resistance. If the meter reads infinity
before the bolt can be completely removed, the interlock is working. If the
actuator bolt can be completely removed and the resistance DOES NOT read
infinity, the interlock is not working and the complete mechanism including the
switch must be removed and disassembled to determine the cause of the
malfunction.
If testing determines that an interlock is not working, BE SURE TO SHUT
DOWN THE GRANULATOR, PULL IT OUT OF SERVICE AND LOCKOUT
THE MAIN POWER before removing the front cover, opening the hopper or
attempting to gain access to the interlock switches. The interlock switches and
mechanisms can be accessed by removing the belt guard on the right side of the
granulator. In some cases, it may be necessary to remove or slide back the
flywheel to completely remove the interlock switch assembly.
BP1620, BP1628 & BP1640 Granulators
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7
Startup Checklist
7-1 Introduction
After all electrical and mechanical machine elements have been
inspected and any defects corrected, the machine can be put
into production once the start-up checklist has been referred to.
7-2 Fan Evacuation
Sterling granulators can be supplied with an optional fan
system to provide efficient, continuous evacuation of granulate
from the machine. Sterling offers a large variety of fan
configurations. The following information is intended to be
representative of the basic functioning and design of a fan,
rather than being specific to one particular configuration.
Please follow the instructions listed below for optimal fan
operation, if your unit is equipped with this option.
7-3 Granulator Startup Checklist
X Have all installation and preparation instructions been read
and followed?
X Have the granulator operator and all other necessary
personnel been fully trained on machine operation and all
safety mechanisms?
X Have sufficient service location clearances been allowed?
X Has the equipment been grounded as required by local
codes and/or Article 250 of the National Electric Code?
X Have all motors been checked for rotation?
X Have all machine controls, pushbuttons, and interlock
switch safeties been checked for proper functioning?
X Have the cutting chamber and screen chamber been
checked for foreign matter?
X Have the drive belts and optional fan drive belts been
checked for alignment and tension?
X Is the machine properly closed with all visible fasteners
tight?
BP1620, BP1628 & BP1640 Granulators
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X Are all accessory components electrically and mechanically
connected with proper support and with all fasteners tight?
X Are cyclonic air separator and filter units empty? (optional
equipment)
X Has the fan (optional) been verified for proper rotation
direction?
X Are all electrical enclosure boxes tightly closed and
clamped shut?
X Are all personnel clear of the machine and optional fan?
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8
Operation
8-1 Operation Instructions
1. Prior to machine startup -- All doors, covers, guards, and
interlock switches must be in place, securely fastened, and
functional. All accessory components must be properly
connected. If the granulator has a bin, make sure it is
installed.
2. Turn the main disconnect to the ON position.
3. Start the granulator and fan (optional) by pressing the
appropriate pushbutton at the operator station.
4. Load feedstock at a uniform rate that does not exceed the
capacity of the machine.
NOTE: For color and/or material changes, allow all existing material to
clear the granulator and it’s downstream equipment before
stopping the machine in order to minimize cleaning
requirements.
Refer to Sections 4 and 5 for how to open the cutting chamber
and screen cradle in order to obtain access to other machine
areas for cleanout.
NOTE: If there is an optional access door on the hopper for inspection or
cleanout purposes that is limit switch interlocked, make certain
that the limit switch actuator bracket is re-installed and is
properly in contact with the limit switch or the machine will not
start.
8-2 Temporary Machine Stops
When temporarily stopping the machine, allow all material
to run out of the cutting chamber. NEVER try to restart the
machine with material remaining inside the cutting
chamber.
8-3 Final Machine Stops
When shutting the machine down, allow all material to
drop into the bin or pass through the fan and into the
cyclonic air separator (optional) before pressing the
granulator stop pushbutton.
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8-4 Emergency Stops
Feedstock must be cleaned out of the hopper and cutting
chamber prior to restarting the machine.
NOTE: The Sterling BP1600 Series granulators are not designed for
small purging, chunks of solid plastic or other heavy wall cross-
sectional pieces.
BP1620, BP1628 & BP1640 Granulators
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9
Routine Maintenance
9-1 Lubrication Specifications
9-1-1 Description
All Sterling BP1600 Series machines are equipped with
rotor bearings that are pre-lubricated & sealed from the
factory.
Mounting of the bearings on the Sterling BP1600 Series
machines results in trouble free, low maintenance, and long
lived bearing design.
If seals are damaged and the rotor bearings required
lubrication, use a high quality, lithium based, extreme
pressure (or EP) type of grease, which conforms to NGLI
Grade 2 consistency. This grease has been chosen due to
its suitability for use in heavy-duty applications under
heavy shock loads. It also contains rust inhibitors, has high
temperature stability, and exhibits good water resistance.
Recommended Grease Product Names
Amoco
Castrol
Exxon
Gulf
Amolith EP2
EP2
Ronex MP
Crown #2
Mobil
Shell
Mobilith AW2
Alvania EP LF #2
Sunaplex #2
Multifack EP2
Sunoco
Texaco
NOTE: The bearings should be lubricated with care. Too much
grease applied to the bearings at one time can rupture the
bearing seals. Under normal operating conditions, a
moderate amount of grease applied every 2000 hours
should be adequate to ensure long life. Severe-operating
conditions will require more frequent lubrication intervals.
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9-1-2 Screw Jack Lubrication Instructions
Lifting screws should be checked periodically to ensure that
they are adequately lubricated. It is recommended that the
screw jack be lubricated at monthly intervals, unless
experience indicates that re-greasing should occur at more
regular intervals.
Recommended Grease Product Names (Screw Jack)
Exxon
Mobil
Arco
Nevulla EPO
-20 to 150oF
-10 to 220oF
-10 to 220oF
-20 to 220oF
Mobilux EPO
Litholine HEP1
Gulf Crown EPO
Gulf
9-1-3
Motor Lubrication
See information supplied with motor for lubrication
requirements
9-2
Motor & Belts Servicing
Prior to startup of this machine, it is recommended that the
drive belt tension be checked for proper “RUN IN”
deflection force as listed in column A of the table on the
next page.
After the equipment has run between 24 and 48 hours, drive
belt tension must be checked for proper “OPERATIONAL”
deflection as listed in column B of the table on the next
page.
A V-belt drive will successfully transmit its rated capacity
if the belts are properly tensioned. The method of
tensioning is explained here in detail for your information.
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Belt pulleys
(Located on left-hand
side of unit, under the
sheave guard.)
1. Verify that the alignment of the pulleys is correct.
Utilizing a straightedge of sufficient length to span from
one pulley to the other, place it along the sides of both
pulleys. The entire edge of each pulley should fully
contact the straightedge.
2. Measure the belt span (see Figure 2).
3. Using a spring scale, apply a perpendicular force to any
ONE of the belts at the midpoint of the span.
4. Measure the force (lbs.) required to deflect any ONE of
the belts 1/64th of an inch for every inch of span. For
example: the deflection for a 32 inch span would be
1/64th of an inch times 32 inches, or 1/2 inch. The
force required to deflect the belt is listed in column A
for new belt installations.
5. The motor position should be adjusted until the actual
deflection force matches the forces listed in column A
on page 32 for new belt installations.
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Motor adjusting screws
Loosen these 4 nuts on the
bolts holding the motor on the
motor base. Slide the motor
either backwards or forwards
to achieve the proper belt
tension and retighten the nuts.
6. There will normally be a drop in belt tension during the
first 24 to 48 hours of operation due to stretch and the
belts seating themselves in the sheave grooves.
7. After this initial “RUN IN” period, the machine should
be stopped and the belts should be re-checked for
tension. The motor position should be adjusted until
the deflection force matches the values in column B.
8. In no case should the belts be overtensioned as this can
significantly reduce belt and/or bearing life.
Figure 2
Belt Span and Deflection
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Table 2
Belt Deflection Force
BELT DEFLECTION FORCE (in lbs.)
SMALL SHEAVE
DIAMETER (INCHES)
2.65 to 4.0
A
RUN IN
6.00
B
RUNNING
4.00
BELT
3V
4.12 to 7.0
8.25
6.75
7.10 to 10.9
21.00
25.75
51.00
58.00
4.90
6.00
7.30
9.00
10.30
11.60
17.10
20.00
22.70
32.70
37.30
14.25
17.00
34.50
39.50
3.40
4.10
5.00
6.20
7.00
5V*
11.80 to 16.0
12.50 to 16.0
18.00 to 22.4
3.00 to 3.6
3.80 to 4.8
5.00 to 7.0
4.60 to 5.6
5.80 to 6.8
7.00 to 8.6
7.00 to 8.5
9.00 to 11.0
12.00 to 16.0
12.00 to 14.0
14.50 to 17.0
8V*
A*
7.90
B*
C*
11.70
13.70
15.40
22.40
25.50
D*
E
18.00 to 22.0
20.00 to 32.0
42.30
51.80
28.80
34.50
* For V-band belts, multiply the force shown in the table by the number of belts in the band.
9-3 Knife Removal & Adjustment
NOTE: The rotor and bed knives are subjected to severe work and it
is recommended they be inspected periodically for
sharpness. The sharper the knives are kept, the better the
machine will operate and the better the quality of granulate
it will produce. Waiting until the knives have been
severely rounded, chipped, or otherwise damaged will
result in heavy shock loading during operation causing a
subsequent reduction in knife life. For resharpening
diagrams, refer to Figure 4.
1. Shut OFF and lockout all power including the main
disconnect switch.
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DANGER!
Before undertaking any machine repairs or maintenance, always make certain that
the machine disconnect switch is turned to the OFF position or that the control
enclosure is disconnected from the main power source. Either place a sign indicating
that the main disconnect switch is to remain off or on the switch and/or lock the switch
to prevent accidental activation by someone unaware of work in progress.
2. Follow instructions in Section 4 on opening the cutting
chamber.
3. See drawings in the appendix for the general cutting
chamber drawings.
4. Loosen the fasteners holding the bed knives, shields,
and clamps, working from the knife edges inward to the
center. NOTE the relative position of each part before
they are removed.
5. As the last screw is backed out, the up-stoke knife
clamp and knife will require some support to prevent
them from moving.
6. Clean the bed knife seats thoroughly with a scraper
and/or emery paper to remove any foreign material and
rust.
7. Inspect the components and replace or resharpen as
required.
9-4 Rotor Knife Removal
1. Carefully lock the rotor with the locking pin to prevent
it from turning with the knife in the top position.
2. Loosen the hex head rotor knife bolts and carefully
remove all rotor knives.
3. Rotate the rotor and reposition the locking pin for the
removal of each knife.
4. Clean the rotor knife seats thoroughly with a scraper
and/or emery paper to remove any foreign material or
rust.
5. Inspect the knives and replace or resharpen as required.
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9-5 Rotor Knife Sharpening
The rotor knives must be sharpened to within .003”
(0.076 mm) of each other. Greater dimensional variations
prevent the proper setting of the knife gap and may create
other serious complications.
Grinding the cutting edge until it is free of nicks can be
wasteful. It is not harmful to allow small nicks to remain in
the cutting edge.
WARNING!
Do not install rotor knives that are smaller than the minimum dimension shown,
because the fasteners that secure these knives may interfere with the cutting circle.
The rotor will not be able to rotate and the knives will be damaged.
It is important to note that the minimum dimensions given for the rotor knife and bed
knife cannot be combined simultaneously to produce a cutting combination.
NOTE: Replacement knife sets and knife resharpening services are
available from Sterling. Contact the Customer Service
Department at (800) 229-2919.
Figure 3
Rotor Knife Sharpening
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9-6 Rotor Knife Installation
1. Carefully lock the rotor with the locking pin to prevent
it from turning.
2. Re-install the rotor knives onto the rotor. Do not torque
the hex head rotor knife bolts fully at this point -- snug
them down only.
CAUTION!
New or resharpened knives should be handled with extreme care. It is
suggested that the sharp cutting edge be covered with tape to prevent damage
to the knives or injury to personnel during installation.
3. Check that the heel of the rotor knife is tight up against
the knife seat. Utilizing a .0015” feeler gauge, try to
insert it between the heel of the knife and the knife seat
at both ends and across the rotor knife. If the feeler
gauge will not go down between the heel of the knife
and the knife seat, the knife is installed correctly.
4. Torque down the rotor bolts. Start from the center of
the knife and torque down the bolts equally, working
towards the ends of the knife. Refer to Section 9-11 for
the correct torque values based upon bolt sizes and
thread pitch. After the bolts on each knife have been
fully torqued, re-check with a .0015” feeler gauge
between the knife and seat. Use the same procedure on
all remaining rotor knives.
9-7 Bed Knife Sharpening
Each bed knife is provided with two (2) cutting edges.
When the exposed edges become blunt, the knives can
be turned over and repositioned to present the new
cutting edges.
It is not necessary to grind bed knives to the closely
matched tolerance of the rotor knives and as with the
rotor knives small nicks in the cutting edges will not
seriously affect knife cutting efficiency. Bed knives
smaller than the minimum dimension shown must be
replaced along with their fasteners.
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It is important to note that the minimum dimensions
given for the rotor knife and bed knife cannot be
combined simultaneously to produce a cutting
combination.
NOTE: Replacement knife sets and knife resharpening services
are available from Sterling. Contact the Customer
Service Department at (800) 229-2919.
Figure 5
Bed Knife Sharpening
9-8 Bed Knife Installation & Setting
1. Install the new or resharpened bed knives, and clamps
in the reverse of removal. Make sure the knives are
fully back against the knife adjusting screws and loosen
the adjusting screw checknuts slightly. Do not torque
the hex head screws fully at this point -- snug them
down only.
CAUTION!
New or resharpened knives should be handled with extreme care. It is
suggested that the sharp cutting edge be covered with tape to prevent damage
to the knives or injury to personnel during installation.
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2. Align a rotor knife with the primary bed knife, in the
front of the granulator. With a .006” feeler gauge
between the rotor and bed knife, start to adjust the bed
knife into the rotor knife using the adjusting screw.
During the movement of the bed knife, slowly rotate the
rotor back and forth checking the clearance. The proper
clearance will be established across the length of the
knife when a slight “drag” is felt on the feeler gauge.
Partially tighten the bed knife hex head screws. Follow
this procedure for all remaining bed knives.
Rotor knives
Bed knife screws (in
metric)
Primary Bed Knife
3. If you find a “high” rotor knife, mark it and adjust to
this knife.
Bed knife adjusting
screws (in metric)
4. Once knife adjustments are completed, equally and
fully torque the bed knife cap screws, working from the
center out towards the ends of the knife. Refer to
Section 9-11 for the correct torque values based upon
bolt size and thread pitch.
5. Re-check the clearance once the bolts have been fully
torqued and reset if necessary.
6. Turn the rotor so that the knives are aligned with a
secondary bed knife on the rear of the granulator and
continue with the same procedure used to setup the
primary bed knife.
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7. After the clearance setting of both the primary and
secondary bed knives is complete and checked, turn the
rotor by hand to ensure that none of the rotor knives hit
the bed knives.
8. Double check inside the machine to make sure no tools
or other articles are left in the cutting chamber or have
fallen into the screen area.
9. Close the cutting chamber and tighten the fasteners
(refer to Section 4-2).
9-9 Preventative Maintenance Service
Follow a systematic preventative maintenance program to
help avoid costly down time. Call the Sterling Service
Department to arrange a schedule of inspections. This
service can be tailored to fit your maintenance
requirements.
9-10 Recommended Torque For Knife Bolts
NOTE: For Rotor knife applications, use Grade 10.9 ad cap screws.
For Bed knife applications, use Grade 10.9 hex head
screws.
Table 6
Recommended Bolt Torques (Metric)
FT/LBS TORQUE
METRIC SCREW SIZE
(DRY)
M8
28
M10
M12
M14
M16
M18
M20
M24
54
100
155
232
340
472
610
**The above listed torque values are standard specifications.
***Metric Knife Bolt/Screw Tightening Torque for Grade 10.9 Fine Thread
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10
Troubleshooting
Problem
Possible Cause
Solution
Verify that the correct
pushbuttons are being
depressed and that the
main disconnect switch is
in the ON position.
No power.
Try to locate grounds, a
locked rotor or other
reasons.
Fuses are blown.
Replace fuses with the
size and type shown on
the wiring diagram
(located in the control
enclosure).
Motor/(optional) fan
motor will not start.
Check for motor and fan
overloads.
If required, reset #1
MOL, #2 MOL.
Check the limit switches
at the cutting chamber,
screen chamber, and
hopper cleanout doors.
Ensure proper actuation
and replace if required.
Check safety limit switch
to be sure it is making
contact.
If a limit switch is open.
If fan is hinged type
design (optional)
Check jumper on
terminals #3 & #5.
If not equipped with fan
After completing above
inspection, machine will
still not start.
Call Service Department.
Reduce amount of
feedstock put into
machine per unit of time.
Clear the jammed
Machine is overloaded
with feedstock.
Machine stalls/(optional)
fan stalls
material then visually
inspect the rotor to
ensure it is not damaged
and that the knife gaps
are correct.
Pieces of feedstock
jammed in the rotor.
Possible Cause
Solution
Problem
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Inspect, and if
Machine has loose or
Machine stalls/(optional) thrown belts.
fan stalls
acceptable for use,
reinstall and tighten per
instructions.
(Optional) Fan wheel is
loose on shaft.
Tighten screws as
required.
Reduce the amount of
feedstock put into the
machine per unit of time.
Sharpen or replace
knives and reinstall.
Adjust knives to proper
gap specification.
Overloading of the
machine
Knives are dull
Excessive power
required-blown fuses
Knife gap is too large
Clearance between the
rotor knives and screen
is too small.
Check that the screen is
properly seated in the
screen chamber.
Lubricate per (or replace
bearing) maintenance
instructions (refer to
Section 9-1)
Lack of lubrication
Bearings sound noisy or
are excessively hot
Reduce the amount of
feedstock put into the
machine per unit of time.
Consult the Cumberland
Service Department for
replacement instructions.
Tighten per maintenance
instructions.
Overloading of the
machine
Bearings have exceeded
their rated life.
Belts are too loose
Reduce the amount of
feedstock put into the
machine per unit of time.
Loosen and align as
required.
Overloading of the
machine.
Belts slip or squeal
Pulleys are not properly
aligned.
Inspect, and if
Machine has thrown
belts.
acceptable for use,
reinstall and tighten per
maintenance instructions.
Replace with larger unit
or fan wheel.
Fan is too small
Transition or tubing is
clogged due to
overloading of machine.
Return air vents are
covered or too small.
Reduce the amount of
feedstock put into the
machine per unit of time.
Ensure the vents are
open.
Granulate builds up in
the transition or tubing
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Problem
Possible Cause
Fan wheel is loose on
shaft.
Solution
Tighten set screws as
required.
Transition or cyclonic air
separator tubing is
clogged.
Clean as required.
Granulate builds up in
the transition or tubing
Check for loose fan
wheel on shaft, worn fan
wheel, or loose drive
belts.
Fan is not evacuating
properly.
Material being placed
into the machine for
processing is too large
for the hopper, cutting
chamber, or rotor
diameter.
Reduce the initial size of
the feedstock.
Feedstock hangs up in
the hopper or cutting
chamber
Sharpen or replace
knives and re-install.
Knives are dull.
Regulate the infeed of
scrap to uniformly feed
the machine over an
extended time period.
Overloading of the
machine.
Feedstock may be hung
up inside hopper.
Shut the machine down
and check.
Screens are plugged.
Clean the screens.
Replace with larger unit
or fan wheel.
Fan is too small.
No granulate
Fan line may be clogged. Clean as required.
Fan wheel is damaged or Replace or repair as
worn.
required.
Fan tubing is not
connected properly.
Connect as required.
Adjust knives to proper
gap specifications.
Knife gap is too large.
Knives are dull.
Sharpen or replace
knives and reinstall.
Stringy granulate
Reduce the amount of
Overloading of feedstock. feedstock put into the
machine per unit of time.
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Problem
Possible Cause
Knives are dull.
Solution
Sharpen knives (refer to
Section 9) and re-install.
Plastic is clogging the
screens or transition,
preventing proper fan
evacuation.
Shut the machine down
and clean.
Fines
Rotor speed is too fast.
Change the pulleys.
Change to a screen with
larger holes.
Screen size is too small.
12
Spare Parts
12-1 Recommended Spare Parts
In order to reduce the amount of down time required to
service a granulator, it is recommended that the following be
kept in stock at your facility:
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(1) set of rotor knives and bolts
(1) set of bed knives and bolts
(1) screen or set of screens, (depending if your model
requires multiple screens)
(1) set of belts
(1) set of fuses
(1) set of motor starter heaters
(1) cyclone filter bag (optional)
12-2 Additional Parts
If additional spare parts are required for your granulator,
please consult the Sterling Spare Parts Express Department.
The serial number of the specific granulator will be required
when ordering parts from Sterling.
NOTE: Refer to part numbers on the drawing when ordering
replacement parts. Check the parts carefully as knives and
screens generally have their numbers etched or stamped on
them. The serial number of the machine will be required
when ordering parts from Sterling. This listing of
recommended parts does not include all parts, which are
available for purchase. The Sterling Parts Department can
be reached via a toll free number (1-800-229-2919).
Appendix: General Drawings
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Service Notes
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Service Notes
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