PG 820
GB
ES
Operator’s manual
Please read the operator’s manual carefully and make sure you
understand the instructions before using the machine.
Manual de
instrucciones
Lea detenidamente el manual de instrucciones y asegúrese de
entender su contenido antes de utilizar la máquina.
PG 680
DE
FR
Bedienungsanweisung
Lesen Sie die Bedienungsanweisung sorgfältig durch und machen
Sie sich mit dem Inhalt vertraut, bevor Sie das Gerät benutzen.
Manuel d’utilisation
Lire attentivement et bien assimiler le manuel d’utilisation avant
d’utiliser la machine.
HUSQVARNA CONSTRUCTION PRODUCTS
PG 820
GB ES DE FR
Contents
2 - English
Contents
English
Contents
Key to symbols 4
Safety Instructions 6
Introduction 7
Transport 7
Storage 7
What is what 8
Setting up/Operation 10
Changing the diamonds 12
Variable speed drives/
frequency converters 13
Faults and trouble shooting 16
Diamonds 18
Diamond selection 19
Maintenance 23
Maintenance schedule 27
Technical data 28
English - 3
Key to symbols
4 - English
Key to symbols
Key to symbols
The symbols below are used on the machine and in
this Operator’s Manual. It is important that the user
understands the signifi cance of these in order to work
with the machine safely.
Please read the operator’s manual
carefully and make sure you understand the instructions before using the
machine.
WARNING! Dust forms when grinding
which can cause injuries if inhaled. Use
an approved breathing mask. Always
provide for good ventilation.
Always wear:
• Approved protective helmet
• Approved hearing protection
• Protective goggles or a visor.
• Dust forms when grinding, which can
cause injuries if inhaled. Use dust
mask.
Always wear sturdy non-slip boots with
steel toe-caps.
Inspection and/or maintenance should
be carried out with the motor switched
off and the plug disconnected.
Visual check.
Regular cleaning is required.
This product is in accordance with applicable EC directives.
Always wear approved protective
gloves.
English - 5
Safety Instructions
Safety Instructions
WARNING
Under no circumstances may the machine be
started without observing the safety instructions. Should the user fail to comply with
these, Husqvarna Construction Products
Sweden AB or its representatives are free
from all liability both directly and indirectly.
Read through these operating instructions
and make sure that you understand the
contents before starting to use the machine.
Should you, after reading these safety instructions, still feel uncertain about the safety
risks involved you must not use the machine,
please contact your dealer for more information.
• Please read the operator’s manual carefully.
• Only qualifi ed staff should be allowed to operate
machinery.
• Never use a machine that is faulty. Carry out the
checks, maintenance and service instructions described in this manual. All repairs not covered in this
manual must be performed by a repairer nominated
by either the manufacturer or distributor.
• Never use the machine if you are tired, if you have
drunk alcohol, or if you are taking medication that
could affect your vision, your judgement or your coordination.
• Never use a machine that has been modifi ed in any
way from its original specifi cation.
• Be on your guard for electrical shocks. Avoid having
body contact with lightning-conductors/metal in the
ground.
• Never drag the machine by means of the cord and
never pull out the plug by pulling the cord. Keep all
cords and extension cords away from water, oil and
sharp edges.
• Make sure the cord is not pinched in doors, fences
or the like.
• Check that the cord and extension cord are intact
and in good condition. Never use the machine if the
cord is damaged, hand it in to an authorized service
workshop for repair.
• Do not use a rolled up extension cord
• The machine should be connected to an earthed
outlet socket.
• Check that the mains voltage corresponds with that
stated on the rating plate on the machine.
• Always wear personal safety equipment such as
sturdy non-slip boots, ear protection, dust mask and
approved eye protection.
• The machine should not be used in areas where
potential for fi re or explosions exist.
• Machinery should only be started when grinding
heads are resting on the ground unless carrying out
a testing procedure as outlined in this manual.
• The machine should not be started without the
rubber dust skirt attached. It is essential a good
seal between machine and fl oor be established for
safety, especially when operating in dry grinding
applications.
• When changing the grinding discs ensure power
supply to the unit is OFF by engaging the Emergency Stop button and the power-plug disconnected.
• The machine should not be lifted by handles, motor, chassis or other parts. Transportation of the
machine is best done on a pallet / skid to which the
machine must be fi rmly secured.
• Ensure the cord is behind you when you start to use
the machine so that the cord will not be damaged.
At no time should lifting of machinery be attempted
without mechanical means such as a hoist or fork
lift.
WARNING!
Overexposure to vibration can lead to circulatory damage or nerve damage in people
who have impaired circulation. Contact your
doctor if you experience symptoms of overexposure to vibration. These symptoms include
numbness, loss of feeling, tingling, pricking,
pain, loss of strength, changes in skin colour
or condition. These symptoms normally appear in the fi ngers, hands or wrists.
• Extreme caution must be used when moving
machinery by hand on an inclined plane. Even the
slightest slope can cause forces/momentum making
the machinery impossible to brake manually.
6 - English
Introduction
Introduction
The Husqvarna PG 680/820 fl oor surfacing machines
are designed for wet or dry grinding of marble, terrazzo, granite and concrete. Their applications range from
rough grinding through to a polished fi nish.
This manual covers the Husqvarna PG 680/820 series
of fl oor grinders equipped with twin motor drive here
after referred to as Dual Drive Technology™.
It is extremely important all users be familiar with the
contents of this manual before
commencing operation of either machine. Failure to
do so may result in damage to machinery or expose
operator to unnecessary dangers.
IMPORTANT!
The machine should not be lifted by handle,
motor, chassis or other parts. Transportation
of the machine is best done on a pallet/skid
to which the machine must be fi rmly secured.
Do not attempt to slide the tines/forks from
a fork lift under grinding heads unless on a
pallet/skid. Failure to do so can cause irreparable damage to grinding heads of machine
and internal parts.
It is recommended that machinery be transported with
a set of diamonds attached at all times to ensure protection of locking mechanism for diamond plates.
IMPORTANT!
Only staff that have received the necessary
education, both practically and theoretically
concerning their usage should operate the
machinery.
Transportation
The machine comes equipped with inbuilt advanced
electronic systems called variable speed drives or
frequency converters. These drives enable the variable
speed and direction component of each of the motors.
The drives are located in the steel cabinet mounted on
the machine chassis.
As with all electronic equipment, the drives are sensitive to excessive vibration, rough treatment and high
levels of dust. Much care and attention has been given
by the manufacturer to ensure maximal protection is
given to the drives. Note the shock absorbing mounting system used to mount the steel cabinet on the
machine chassis/frame.
Storage
The machine should always be stored in a dry place
when not in use.
When transporting, it is important to ensure the machinery is properly secured at all times to eliminate
“bouncing” of the variable speed drives. Ensure the
chassis or frame section of the machine is secured
down at all times when in transit.
The machine should always be transported under
cover limiting the exposed to natural elements – in
particular rain and snow.
English - 7
What is what
1.
3.
2.
4.
5.
11.
10.
9.
6.
7.
What is what
1. Hour counter
2. Electrical cabinet
3. Planetary head motor 1.5kW/1Hp
4. Grinding/Satellite heads motor 11kW/15Hp
5. Lifting lugs
6. Cover/Shroud
7. Skirt
8.
8. Chassis/Frame
9. Handle bars
10. Control Panel
11. Handle bar adjuster
8 - English
What is what
The machine can be divided into two main parts. These
can be identifi ed as follows:
1. Chassis/Frame section – comprising handle bars,
electrical cabinet, steel frame and wheels.
2. Head – comprising of motors, cover, grinding/satel-
lite/
planetary heads and internal components.
The machine has been manufactured to allow movement between the chassis and head via the connection
point at the lifting lugs and chassis pins. This movement is important during the grinding process as it
creates a “fl oating” effect for the head.
The fl oating gives the head a self-leveling effect, negat-
ing the need to adjust the height of the head as the
machine passes over fl oor areas with different slopes
or undulations.
Control panel
The control panel consists of a number of switches and
dials giving 8 separate controls (see picture).
IMPORTANT!
Planetary head and grinding heads are set
to both turn in the same direction (i.e. both in
clockwise rotation or both in counter-clockwise rotation).
Clockwise rotation of speed control will increase speed of planetary head and grinding
heads.
Grinding satellite/ heads
Planetary head
Power - This button, when depressed, will turn on
power supply to the unit when the EMERGENCY
STOP button has been released.
Emergency Stop - When pushed will immediately
shut down machine by totally stopping power supply to
drives/ frequency converters in electrical cabinet.
Head Speed - Direction control for planetary head rotation.
Fwd/Rev (Yellow) - Direction control for planetary head
rotation.
Disc Speed - Speed control for grinding heads.
Fwd/Rev (Red) - Direction control for grinding heads.
Reset - Will clear fault function/error message on
drive/frequency converter (located in electrical cabinet)
in case of fault occurring.
Stop/Run - To start or stop machine during normal
operation.
IMPORTANT!
Dust extraction port
It is important to use the STOP/RUN switch
to control the running of the machine, not
the EMERGENCY STOP button. Each time
the EMERGENCY STOP button is pressed
it shuts down the drive/frequency converter.
Frequently powering up and down of the
drive/frequency converter will reduce the life
span of the drive/ frequency converter.
Control panel
English - 9
Setting up/Operation
Setting up/Operation
Position grinder on the working area. Make sure there
are diamonds underneath machine and that the head
locks/shear pins are tight.
IMPORTANT!
When using the machine, each grinding head
must always have the same diamond type
and number of diamonds as the other grinding heads. Each grinding head must have
diamonds the same height as the other grinding heads.
Adjust rubber skirt so that a good seal is established
between the fl oor and head of machine (see picture
below). Ensure join in skirt is at the front of the machine. Setting of the skirt is essential to obtain good
dust extraction and eliminate the possibility of airborne
dust when dry grinding.
Powering up machine
i. Ensure the STOP/RUN switch is set on Stop
(rotate counter clockwise).
ii. Plug power supply to machine. Only turn power on
at
switch once fully connected.
Set handle to most comfortable working height using
adjustment lever.
IMPORTANT!
It is recommended that this height be set as
close as possible to the height of the operator’s hip bone. When the machine is running,
there will be a grinding force/pull to one side
that can be felt through the handlebars. Use
the hip to resist this force instead of trying to
control this through the arms (such positioning will be much easier for the operator using
the machine over prolonged periods of tim.
iii. Disengage Emergency Stop button (twist clockwise).
iv. Depress Power button. On doing so, a soft “clunk”
should be heard to come from within the electrical cabinet. This indicates the line contactors have engaged,
supplying power to the drives/frequency converters.
Setting Speed and direction
On the control panel there is a FORWARD/REVERSE
and Speed dial knob. Generally, when starting the
machine for the fi rst time on any given application, it is
advised the speed setting should not exceed 7, initially.
When the operator is comfortable with the application,
speed may be increased.
10 - English
Setting up/Operation
Speed and direction setting is often a matter of personal choice. Operators are encouraged to experiment
to fi nd which settings best suit the given applications.
The following table lists some suggested set-ups for
different applications.
Application Planetary
head
direction
Ceramic tile adhesive removal FWD 6-7 FWD 8-10
Carpet glue removal FWD 5-7 FWD 8-10
Epoxy paint removal FWD 5-10 FWD 8-10
Rain damaged concrete FWD 7-10 FWD 8-10
Smoothen exposed aggregate FWD 7-8 FWD 8-10
Lippage removal in terrazzo/stone tiles FWD 5-7 FWD 8-10
Concrete polishing with resin bond pads FWD 10 FWD 8-10
PIRANHA™ scraper tool REV 3-5 REV 3-5
FLEXOR™ fl exible heads FWD 5-7 FWD 5-7
Bushhammer/Scarrifi er tools FWD 5 FWD 5-7
Re-grouting procedure during HiPERFLOOR™
process
IMPORTANT!
In the above table, FWD & FWD are listed
together to indicate direction settings in the
same direction (i.e. It can also be REV/REV).
The only application where direction settings must be in the same directions and also
direction specifi c is when using the PIRA-
NHA™ scraper tools. In this particular application the setting must be in the REV/REV
direction.
Direction of rotation
The correlation between FWD/REV & Clockwise/Counter clockwise rotation can be said as follows if looking
at the grinding discs from underneath the machine:
1. REV—Clockwise.
2. FWD—Reverse.
FWD 8-10 FWD 3-5
Direction is also a matter of personal preference. It
should be noted, however, that when both grinding
discs and planetary heads are running in the same
direction, a more powerful grinding force is created between the diamond abrasives and fl oor being ground.
The end result is higher productivity than when the
discs are set to run in opposite directions. It is here
that you will also experience the beneift of Dual Drive
Technology™.
Production tip - To improve the cutting effi ciency of
diamonds, change directions on a regular basis. This
will work both sides of the diamond crystals, keeping
the abrasives as sharp as possible by creating maximal exposure of the diamond crystal.
Once both a speed and direction have been
nominated, switch on dust extraction or vacuum device.
Planetary
head
speed
Grinding disc
direction
Grinding disc
speed
As mentioned, when the machine is in operation it will
“pull” to one side. The direction of pull is determined by
the planetary head direction of rotation. The head of
the machine will pull to the right (and therefore, will be
felt on the right hip of the operator) when the planetary
head is set in the REVERSE direction.
This sideways pull can be very useful when grinding,
particularly along a wall. Set the machine so that it
pulls towards the wall, and then control the machine so
it can just touch the wall. This will ensure a grind close
to the wall or object.
IMPORTANT!
It is highly recommended to use the Husqvarna DC 5500 dust extraction system
for complete dust control.
Standing behind machine with handlebars set as
described earlier, apply a small amount of downward
pressure on the handle. Switch the machine to run
mode using the STOP/RUN switch on the control
panel. The machine should start smoothly and accelerate to the selected speed over a period of 5 seconds
English - 11
Changing the diamonds
Changing the diamonds
As different applications require different selections of
diamond tools, there will be many occasions when the
grinding discs need to be changed.
Following is a guide for this procedure.
Preparation
1. Ensure STOP/RUN switch is in STOP position as
unintentional starting of machine while changing
discs
can result in serious injury.
2. Have a set of gloves ready, as diamonds can get
very
hot during dry grinding applications.
Changing
1. Set handle in upright position (illustrated right).
2. Pull back on handle to lift grinding head off the
ground.
4. Lay machine back on the ground.
5. Put on gloves.
6. Remove grinding disc by slightly rotating disc and
then
pull off (direction that the discs will need to be rotated
will depend on the direction the machine was last
running).
7. Check to ensure all head locks/shear pins are tight.
8. Once new diamonds have been attached, reverse
procedure to lower machine to ground.
9. As new diamonds may be a different height to set
being previously used, re-adjust skirt to ensure
good seal is established with the fl oor.
12 - English
Variable speed drives/frequency converters
Variable speed drives/
frequency converters
Each Husqvarna PG 680 & 820 is equipped with 2
variable speed drive or frequency converter. This
unit is incorporated into the machine for the following
reasons:
1. Functional
• Manipulate incoming power to enable increase/
decrease in speed & direction change.
• Regulate current and voltage supply to the motors
to ensure motors run at optimum levels (e.g.
torque boost).
2. Protection/Diagnostic
Protection
• Monitors incoming power to ensure suitability for
machine and application being performed.
• Controls current being drawn by motors to ensure
motors are running within safe operational limits (to
prevent damage to motor).
• Monitors load on machine to ensure the grinder is
not being overloaded thus offering protection for
belt, bearings and other internal components.
2.
1.
8.
7.
• Protects motors from faulty power supply (e.g. running on 2 phases).
Diagnostic
• Identifi es electrical faults with the machine and
registers fault code.
• Has monitoring menus that help isolate cause of
potential electrical faults.
• Monitoring menus also enable operator to gauge
how hard machine is working. Whilst it is not essential for an operator to intimately know every feature
of the variable speed drives or frequency converters, it is useful to be familiar with both the fault
codes as well as some of the monitoring menus.
Keypad/Display
Each variable speed drive or frequency converter has
a keypad which will appear as illustrated on the right
when the machine has power connected to it.
4. 3.
1. Run direction (fwd or rev)
2. Indicates if unit is either stopped or running
3. Up key
4. Left key
5. Down key
6. Reset button
7. Output mode (Hertz in this example)
8. Output value
5.
Keypad display
6.
English - 13
Variable speed drives/frequency converters
Monitor screen Information provided
OUTPUT FREQUENCY Frequency motor is running at when machine is running.
REF. FREQUENCY Frequency speed control dial is set to.
MOTOR SPEED Speed of motor when machine is running.
MOTOR CURRENT Current draw of motor when machine is running.
MOTOR TORQUE Percentage of motor torque when machine is running.
MOTOR POWER Percentage of motor power when machine is running.
MOTOR VOLTAGE Percentage of motor voltage when machine is running.
DC LINK VOLTAGE Indicates quality of power supply.
The menu tree illustrated on this page outlines the
important menu options that provide useful information
for monitoring and diagnostic purposes when using the
machine.
As can be seen on the menu tree to the right, when
the machine is turned on, the variable speed drives or
frequency converters are set to display the Output Frequency to the motor (a zero value will register when the
machine is in stand-by mode).
The Output Frequency page also falls under the Monitor
Menu.
It can be seen from the left hand column, the two primary
menus important to the operator are the Monitor Menu
and Fault History menu.
Navigation through the menu tree is achieved by using the up, down, left and right keys on the keypad (see
previous page).
Parameter Menu
Keypad
Control Menu
Active Faults Menu
Faults History Menu
System Menu
Expanded Boards
Menu
DC Link Voltage
Motor Voltage
Motor Power
Motor Torque
Motor Current
Motor Speed
14 - English
Monitor Menu
Output Frequency
Variable speed drives/frequency converters
Menus and information they provide
The following menu items/screens on the variable
speed drive/frequency converters provide the following
useful information to the operator.
OUTPUT FREQUENCY (Monitor Menu)
This screen tells the operator the frequency the motor
is running at when the machine is in operation. The
value for output frequency should be constant when
the machine is running. If there is a fl uctuation in
output frequency when the machine is running, generally this indicates the motor is running at or near the
limit of its programmed current limit. The current limits
(predetermined and set by Husqvarna Constructions
Products) are as follows:
1. Large motor (which information is found on the large
variable speed drive/frequency converter) - 25
amps.
FAULT HISTORY
The fault history menu stores the last series of faults
experienced by the variable speed drive/frequency
converter. If there is a recurring fault pattern experienced by the machine, the information can be obtained
from the fault history menu. For more on faults, see
trouble shooting faults
2. Small motor (which information is found on the small
variable speed drive/frequency converter) - 5 amps.
If there is a fl uctuation in output frequency when the
machine is in operation, it is advisable to check the
motor current as well. This can be found by pressing
the UP arrow on the keypad 3 times. For trouble free
operation concerning current issues, it is best to keep
output current at or around 21 amps (for the large motor). The current draw of the motor can be reduced by
reducing the speed of the motor using the speed dial
on the control panel near the handle bars.
Generally speaking, most over-current problems will
be associated with the large motor (and therefore,
monitored on the large variable speed drive/frequency
converter). Keep the current draw on the small motor
under 3.5amps for consistent operation.
MOTOR CURRENT (Monitor Menu)
This screen displays the current draw of the corresponding motor (i.e. large variable speed drive/frequency converter monitors function of large motor,
small variable speed drive/frequency converter monitors function of small motor) when the motor is running.
See comments already covered under OUTPUT FREQUENCY relating to motor current.
DC LINK VOLTAGE (Monitor Menu)
This screen displays the quality of the power supply to
the machine. It will read higher values when the machine in standby and lower values when the machine
is in operation.
English - 15
Faults and trouble shooting
Faults and trouble shooting
When either one of the variable speed drives or frequency converters in the machine experience a fault and “trip”
out, they will cease to run and an error message will appear fl ashing on the keypad display (see picture below).
The following list are the most commonly experienced
faults and possible action steps.
Fault Code Possible Cause Action
1—OVERCURRENT Motor being worked too hard and
drawing extra current.
Short circuit on output side of variable speed drives or frequency converters.
Motor failure (very rare) Have motor tested and replace if required.
3—EARTH FAULT Short circuit on output side of vari-
able speed drives or frequency converters.
Motor failure (very rare) Have motor tested and replace if required.
9—UNDERVOLTAGE Insuffi cient voltage supply to ma-
chine.
Power supply to variable speed
drives or frequency converters has
been turned off.
11—OUTPUT PHASE
SUPERVISION
14—UNIT OVER TEMPERATURE
Short circuit on output side of variable speed drives or frequency converters.
Motor failure (very rare) Have motor tested and replace if required.
Variable speed drives or frequency
converter over temperature due to
high temperature working environment or faulty temperature sensor.
Check current being drawn when machine is
running. Reduce speed setting and current draw
back into acceptable limits as described on
previous page.
Check wiring in plugs connected to motor cables
or inside connection boxes on motors.
Check wiring in plugs connected to motor cables
or inside connection boxes on motors.
Check power supply and ensure correct voltage.
Re-connect power to grinder.
Check wiring in plugs connected to motor cables
or inside connection boxes on motors.
Open door on electrical cabinet to increase ventilation.Have variable speed drives or frequency
converter tested by service agent.
Fault code
15—MOTOR STALLED Motor being worked too hard and
drawing extra current.
Mechanical jam preventing motor
from turning.
16 - MOTOR OVERTEMPERATURE
16 - English
Motor being worked too hard and
drawing extra current.
Check current being drawn when machine is
running. Reduce speed setting and current draw
back into acceptable limits as described on
previous page.
Try rotating grinding discs and planetary head by
hand to see if jam exists
Check current being drawn when machine is
running. Reduce speed setting and current draw
back into acceptable limits as described on
previous page.
Faults and trouble shooting
Further problems that may be experienced when using the grinder and potential solutions are as follows:
Problem Possible Cause Potential Solution
GRINDER IS HARD TO HOLD
ONTO
GRINDER SOUNDS LIKE IT IS
OVERREVVING
GRINDER IS JUMPING AROUND Grinding heads may be worn-out or
Not enough diamonds under the
machine (if grinding thick glue or
soft fl oors, too few diamonds under
the machine will greatly increase
the load on grinder and operator).
Usually also accompanied by high
current draw by large motor.
Large motor not working (this can
be caused by fault with motor, fault
with wiring to motor, or fault with
large variable speed drive or frequency converter).
Drive belt is slipping. Remove belt tensioner cover plate on bottom of
Drive belt is broken (this can be
confi rmed by turning one of the
grinding heads by hand. If all grinding heads rotate together, belt is not
broken. If only one grinding head
turns, belt is broken).
Small planetary drive motor not
plugged in.
Small motor not working (this can
be caused by fault with motor, fault
with wiring to the motor, or fault
with large variable speed drive or
frequency converter).
damaged.
Diamonds may not be fi tted cor-
rectly or different height diamonds
may be on the grinding heads.
Increase number of diamonds under machine to
reduce load on grinder and operator.
Check large motor is plugged in. Check there
are no faults on larger variable speed drive or
frequency converter. Check that large variable
speed drive or frequency converter is on. Check
that large variable speed drive or frequency
converter is func tioning properly (unplug both motors, set display on keypad to Output Frequency,
switch machine to RUN, see if numbers on screen
change from zero and begin counting up. If numbers stay on zero, large variable speed drive or
frequency converter is not receiving run command
from switch on control panel. Machine needs to
be checked by an electrician or by Husqvarna
Construction Products
machine and check there is no water or dust on
the inside of the machine that may be causing the
belt to slip on the drive pulleys.
Replace internal drive belt.
Check small planetary drive motor is plugged in.
Check small motor is plugged in. Check there are
no faults on small variable speed drive or frequency converter. Check that small variable speed
drive and frequency converter is on. Check that
small variable speed drive or frequency converter
is functioning properly (unplug both motors, set
display on keypad to Output Frequency, switch
machine to RUN, see if numbers on screen
change from zero and begin counting up. If numbers stay on zero, small variable speed drive or
frequency converter is not receiving run command
from witch on control panel. Machine needs to be
checked by an electrician or Husqvarna Construction Products.
Check grinding heads for broken parts or excess
movement.
Check to ensure all diamonds are fi tted correctly
and are the same height.
Head locks may be loose or missing.
Check to ensure all head locks are present and
tight.
English - 17
Diamonds
Diamonds
Background
Diamond abrasives usually consist of 2 components:
1. Diamond powder (also known as diamond crystals
or grit). By changing the size of the diamond powder
or grit, we can change how coarse or fi ne the
scratches will be that are left behind from the
grinding process.
2. A binding agent (metal or resin). Diamond powder
is mixed and suspended in either a metal or resin
binding agent. When suspended in a metal binding
agent, the fi nished product is referred to as a Metal
Bond or Sintered diamond segment. When suspended
in a resin binding agent, the fi nished product is
referred to as a Resin Bond diamond segment or
pad. By changing the hardness of the binding agent,
we can change how fast or slow the diamond abrasive
will wear.
General Principles
The following are general rules regarding diamond segments in grinding applications. As with all general rules
there are exceptions or cases when it is not the case.
DIAMOND GRIT SIZE
Changing the size of the diamond grit to a smaller particle/grit size will effect the performance of the diamond
tool in the following ways:
• Create a fi ner scratch pattern.
• Increase the life of the diamond tool.
NUMBER OF DIAMOND SEGMENTS/PADS UNDER
THE MACHINE
Increasing the number of segments under the machine
will:
• Reduce pressure on each individual diamond segment.- Reduce wear rate on diamond segments.
• Reduce load on the machine and cause the grinder
to draw less current.
• Create a smoother scratch pattern (particularly on
soft fl oors).
The opposite will occur when decreasing the number
of segments under the machine.
WET AND DRY GRINDING
When using diamond segments wet, the following
principles apply:
• Production rates will be higher than dry grinding.
• Diamond segments will wear faster (due to presence of slurry) and therefore, harder bonds can be
used (when comparing with dry grinding).
• Scratches from diamond grit will be deeper.
When using diamond segments dry, the following principles apply:
• Production rates will be slower on harder materials
than if wet grinding.
• Softer bond segments will be required in order to
encourage segment wear (as there will be not slurry
to help diamond segments to wear).
The opposite will occur when changing to a larger
particle/grit size.
BINDING AGENT—METAL BOND OR RESIN BOND
Increasing hardness of bond will:
• Increase life of diamond tool.
• Decrease production rate.
• Cause diamond tool to leave fi ner scratches in dry
- grinding applications (when compared to a softer
bond diamond tool with the same diamond grit size).
The opposite will occur when making the metal or resin
bond softer.
• Scratches from diamond grit will not be as deep
compared to if it were also used for wet grinding.
• There will be more heat generated by the diamond
segment.
Summary of diamond principles
Diamond segments need to wear in order to achieve
productivity. Diamond segment wear can be infl uenced
by the following factors:
• Pressure.
• Hardness of bond.
• Diamond grit size.
• Presence of water.
• Number of segments under the machine.
• Adding an additional abrasive (e.g. sand, silicone
carbide) on the fl oor will increase wear.
18 - English
Diamond selection
Diamond Holder Disc
Full set of single segments
Position for Diamond segment
Full set of twin segments
Generally speaking, the faster a diamond segment
wears, the faster the productivity will be. By varying the
above factors, changes can also be made to effect the
following:
• Scratch pattern.
• Current draw of machine.
• Flatness of fl oor (see next section).
Half set of single segments
Half set of twin segments
Diamond selection
The following section covers important factors to
consider when selecting the diamond segment you are
going to use for a given application.
Grinding disc set-up
The way diamond segments are set-up on the grinding
heads of the machine will also greatly infl uence the
performance of the machine, the productivity levels
and also the fi nished fl oor quality.
• Ease of operation.
There are basically two types of diamond confi gura-
tions that can be used when using the grinder:
1. Full set of diamonds – when there are diamonds
placed
at each of the six positions on the diamond holder
discs
(see pictures above).
2. Half set of diamonds – when there are diamonds
placed
at three alternating positions on the diamond holder
discs (see pictures above).
English - 19
Diamond selection
Full and half sets of diamonds
By changing the way the diamonds are set-up on the
diamond holder discs, an operator can signifi cantly ef-
fect the performance of the machine and therefore, the
fi nished product.
HALF-SET OF DIAMONDS
When the diamonds are set-up as a half-set, they tend
to follow the surface of the fl oor. Similar to a tripod for a
camera, which can be placed on an uneven surface and
yet still fi nd a stable footing.
The half-set diamond confi guration should only be used
when a fl at fl oor fi nish is not required.
FULL-SET OF DIAMONDS
When the diamonds are set-up as a full-set, they tend
not to follow the surface of the fl oor. If the fl oor has undu-
lations, the machine will grind the high areas yet miss
the low spots (unless the high areas are ground down
fi rst).
The full-set diamond confi guration should be used when
a fl at fl oor fi nish is desired.
The below table gives some examples of possible applications for the two arrangements:
Application Full set is best Half set is best
Ceramic tile adhesive removal X
Carpet glue removal X
Epoxy paint removal X
Vinyl adhesive removal X
Rain damaged concrete X
Smoothen exposed aggregate X
Lippage removal in terrazzo/stone tiles X
Surface polishing of concrete fl oors X
Grinding to expose aggregate in concrete polishing application X
Remove lippage from terrazzo/natural stone tiles X
Flatten undulations in concrete fl oors X
Re-polish fl oors that have been ground before X
20 - English
Diamond selection
Selecting the correct diamonds for your application
The following suggestions cover the basic principles for
diamond selection for different applications.
Application Metal
bond
Flatten fl oor - Hard concrete SOFT 16 or 30 X S
Flatten fl oor - Medium concrete MEDIUM 16 or 30 X S
Flatten fl oor - Soft concrete HARD 16 or 30 X T
Ceramic tile adhesive removal HARD 6, 16 or 30 X S/T
Vinyl or Carpet glue removal - Hard concrete SOFT 16 or 30 X S/T
Vinyl or Carpet glue removal - Medium concrete MEDIUM 6 or 16 X T
Vinyl or Carpet glue removal - Soft concrete HARD 6 or 16 X T
Epoxy paint removal - Hard concrete SOFT 6, 16 or 30 X X S
Epoxy paint removal - Medium concrete MEDIUM 6, 16 or 30 X S
Epoxy paint removal - Soft concrete HARD 6, 16 or 30 X S/T
Rain damaged concrete HARD 16 or 30 X S/T
Smoothen exposed aggregate HARD 16 or 30 X S/T
Lippage removal in terrazzo - stone tiles SOFT 30 or 60 X S
Surface polishing of concrete fl oors - Hard concrete SOFT 60 X S/T
Surface polishing of concrete fl oors - Medium concrete MEDIUM 60 X S/T
Surface polishing of concrete fl oors - Soft concrete HARD 60 X T
Grinding to exposed aggregate in concrete - Hard concrete SOFT 16 or 30 X S
Grinding to exposed aggregate in concrete - Medium con-
crete
Grinding to exposed aggregate in concrete - Soft concrete HARD 16 or 30 X T
Flatten undulation in concrete fl oors - Hard concrete SOFT 16 or 30 X S
Flatten undulation in concrete fl oors - Medium concrete MEDIUM 16 or 30 X S
Flatten undulation in concrete fl oors - Soft concrete HARD 16 or 30 X T
MEDIUM 16 or 30 X S
Grit size Full-
set
Half
set
Singles /
Twins
English - 21
Diamond selection
Determining the hardness of concrete
All concrete may feel hard (particularly if you fall over
on it), so what do we mean when we talk about hard,
medium and soft concrete?
All concretes are measured by their compressive
strength and depending on which part of the world you
are from, different compressive strength indices (e.g.
PSi & MPa). Generally speaking, the higher the compressive strength rating, the harder the concrete and
therefore, the harder it will be to grind.
However, other factors beside compressive strength
ratings determine how hard the fl oor will be, and
therefore, the correct diamond selection. Since grinding normally only deals with the surface of the concrete
(top 5mm or 1/4 inch), often the way the concrete fl oor
has been fi nished or the condition of the surface will
have a greater bearing on what type of diamond to
select, rather than the compressive strength rating of
the concrete.
SURFACE FACTORS TO CONSIDER WHEN MAKING A DIAMOND SELECTION
Generally speaking, if a concrete surface is very
smooth (i.e. Most likely it has been heavily trowelled/
helicoptered), the concrete will behave as if it has a
high compressive strength and therefore, require a soft
bond segment.
Accordingly, if a concrete surface is coarse/aggressive
(e.g. rain-damaged, shot blasted, scarifi ed, exposed
aggregate e.t.c.), the concrete will behave as if it has a
low compressive strength and therefore, require a hard
bond segment.
Surface coatings/contaminants (e.g. Epoxy coatings,
ceramic tile adhesives, levelling compounds/screeds)
will often have a larger bearing on what diamond to select, than will the compressive strength of the concrete.
As a general rule, when grinding a concrete slab for
the fi rst time and you are unsure about its hardness,
always begin with harder bond diamonds under the
machine. This will ensure the least amount of wear on
the diamond segments. If a hard diamond segment
is not suited to the application, all it has cost is a little
amount of time without wearing out the diamonds.
If performed the other way around (i.e. a soft segment
is used to begin with) and the concrete is soft or possesses an abrasive surface or surface contaminant, it
is quite possible to wear-out a considerable amount of
diamond in very short period of time.
22 - English
Maintenance
Maintenance
Used correctly, the machine is an extremely low-maintenance and reliable.
This section covers the general maintenance items
that need attention on a periodic basis.
There are three main mechanical items to check:
1. Grinding Heads.
2. Planetary drive system.
3. Planetary seal.
Grinding heads
There are 2 different grinding head options:
11. Conventional / Demolition heads—designed for
heavy duty preparation grinding where an extremely
robust system is required.
2. Spring steel head system—designed more for fi nish-
ing or lighter grinding applications.
CONVENTIONAL/DEMOLITION HEADS
The below diagram illustrates the main parts compris-
ing this type of grinding head.
The head pins are fi xed to the head plate giving rigid-
ity and stability. The head mate is situated above the
head plate and is held in place by a series of holes
– head pin holes.
1.
2.
1. Head mate 1. Head plate
2. Head pin hole 2. Head pins
Between the head plate and head mate are 3 white
silicone springs which give shock absorption and fl ex-
ibility in the system.
The head pins are able to move within the head pin
holes, creating a shock absorber type system similar to
that in most motor vehicles.
Over an extended period of time, the head pin holes
wear open. Along with this, the head pins wear and
reduce in diameter. This combined wearing of the two
creates excessive movement or “slop” within the grinding heads. This “slop” will eventually cause vibration
whilst the machine is operating.
1.
2.
2.1. 4. 3.
1. Head mate
2. Head plate
3. Head lock
4. Head spring
The interrelation between the above four components
enables a dynamic system which is both robust and
fl exible.
Routine checks for slop in the grinding heads are
recommended. Life expectancy for grinding heads can
vary between 6 and 12 months depending on amount
of usage.
Replacement heads are available and simply bolt into
place when the old ones are removed
English - 23
Maintenance
Spring Steel Heads
The below diagrams illustrate the main parts comprising
this type of grinding head.
Diagram 1
1. Spring steel spring
2. Head plate
3. Cushion ring
4. Head mate
Diagram 1. Spring Steel Head
1.
4.
3.
Between the head plate and head mate are a series of
white silicone springs, spacers and the spring steel spring
which give shock absorption and fl exibility in the system.
Unlike with the conventional/demolition heads, the spring
steel heads are able to move in a fl exible manner without
any moving parts due to the presence of the spring steel
spring.
Over an extended period of time the spring steel spring
fatigues and the spring steel “fi ngers” begin to break
off. This creates irregular movement within the grinding
heads and will cause vibration when the machine is in
operation.
Routine checks for broken “fi ngers” in the spring steel
grinding heads are recommended. Life expectancy
for grinding heads can vary between 6 and 12 months
depending on the amount of usage.
Replacement spring steel springs are available and can
be replaced without throwing the grinding head away.
The spring steel heads can also be made less fl exible
by the addition of a second spring steel spring.
2.
Diagram 2
1. Spring steel springs
2. Bolts
3. Silicone spring
4. Head mate
5. Cushion ring
6. Head buddy
7. Spacers
8. Head plate
Diagram 2
1.
7. 8.
24 - English
3. 4. 5.6.
2.
Maintenance
Grinding Heads Drive System
The grinder comes equipped with Dual Drive Technology™. As the grinding discs are driven by the large motor via an internal belt, and because the belt is sealed
inside the machine, there is no maintenance regarding
this drive system until a major service (belt and bearing
replacement) is due. This is typically following 12-36
months of operation.
Planetary Drive System
The second component to the Dual Drive Technology™ system is the planetary head drive system which
is powered by the secondary or small motor and
gearbox arrangement. This system is on the outside
of the machine and will require routine maintenance.
The planetary drive system can be seen as illustrated
diagram 1.
Diagram 1
1. Grinding heads motor
2. Motor terminal box
3. Machine cover
4. Gearbox mounting bracket
5. Gearbox fl ange bracket
6. Gearbox
7. Motor terminal box
8. Planetary drive motor
IMOPRTANT!
Lubrication of this system will cause dust to
build up in chain ring and drastically shorten
the life of both the chain ring and planetary
drive sprocket.
Diagram 2 Diagram 3
1. 2. 1. 2.
1. Planetary drive sprocket
2. Gearbox fl ange bracket
Diagram 3
1. Machine cover
2. Chain ring
1.
8.
7.
6.
3.
2.
Diagram 1. Planetary Drive System
Beneath the gearbox and concealed by the mounting
brackets and machine cover, there is a planetary drive
sprocket situated on the output shaft of the gearbox.
This planetary sprocket engages with the chain ring
(also located beneath the machine cover) and
together form the main drive mechanism for the planetary drive system. This system is a dry system (i.e. it
is not required for there to be lubrication between the
planetary drive sprocket and chain ring), to allow any
dust that may come into contact with the chain ring to
fall back out again.
4. 5.
Diagram 4
1. Planetary seal
As the chain ring and planetary drive sprocket are
located beneath the cover of the machine, yet on the
outside of the machine, there lies the potential that
they can be exposed to dust and other debris created
during the grinding process.
To prevent this as much as possible, a planetary seal
has been installed to stop dust and other particles from
coming into contact with the planetary drive mechanism.
Diagram 4
1.
Planetary seal - closeup
English - 25
Maintenance
The effectiveness of the planetary seal can be monitored by the simple removal of the planetary motor
/ gearbox system by removing the four bolts shown
below.
Remove 2 bolts either
side.
Remove 2 bolts either
side.
Remove this bolt.
Inspect for dust build
up here
If the planetary seal is working effectively, there should
be a very minimal amount of dust observed under
the cover of the machine. If there is a build-up of 56mm (1/4 inch), then it is more than likely it is time to
remove the machine cover and check the condition of
the planetary seal.
Remove this bolt.
Remove cover off motor
terminal box.
Remove these bolts.
26 - English
Lift off machine cover to reveal chain ring and planetary
seal.
If planetary seal is worn or needs replacement, contact
your Husqvarna Construction Products distributor for a
new planetary seal replacement kit.
Maintenance schedule
Maintenance schedule
Item Action Frequency
Check that head locks
are tight.
Inspect heads for slop/
broken “fi ngers” if using
spring steel heads.
Check effectiveness of
planetary seal.
Check condition of
chain ring.
Tighten head locks and re-set in thread-locking compound if required (Suggested thread-locking compound
Loctite 680)
Examine machine heads while machine tipped back.
Disconnect Planetary Drive motor (small motor) and run
discs at lowest speed. Check to see how concentric/true
grinding heads are running.
Remove planetary head motor/gearbox system and
check for presence of dust under machine cover .
Remove planetary head motor/gearbox system and inspect chain links in chain ring. Ensure links are clean and
free from build-up.
Daily
Daily
Weekly
Weekly with Planetary Seal
Check condition of
Drive Sprocket.
Inspect internal components of machine.
Clean contents of electrical cabinet.
IMOPRTANT!
Prior to removing belt tensioner cover plate,
ensure cover plate and area surrounding cover
plate are totally clean. Avoid debris from entering into inside of machine.
Remove planetary head motor/gearbox system and
inspect condition of planetary drive sprocket.
Remove belt tensioner cover plate and check inside
machine for dust, moisture or belt fragments. Ensure to
re-seal cover plate with silicone sealant.
Blow out inside of electrical cabinet and variable speed
drives or frequency converters with DRY compressed air.
Weekly with Planetary Seal
6 monthly
Every 2 months
English - 27
Technical Data
Technical Data PG 820 PG 680
Grinding width 820mm (32") 680mm (27")
Grinding disc 3x270mm (10.5") 3x240mm (9.5")
Weight 440kg (970lbs) 385kg (850lbs)
Grinding pressure total 335kg (737lbs) 300kg (660lbs)
Grinding pressure per disc 112kg (246lbs) 100kg (220lbs)
Motor Power 3-Phase 380-480V
3-Phase 380-480V
12.5kW(17.0hp)
12.5kW(17.0hp)
Power per grinding disc 4.15kW (5.7hp) 4.15kW(5.7hp)
Grinding disc speed 250 - 1100rpm 600 - 1200rpm
Planetary head speed 5 - 65rpm 5 - 70rpm
Direction of rotation Independent FWD/REV direction control
on both grinding discs and planetary head.
Power supply 3 phase 3 phase
Noise emissions (see note 1)
Sound power level, measured dB(A) 105
Sound power level, guaranteed L
dB(A) 106
WA
Sound levels (see note 2)
Sound pressure level at the operators ear, dB(A) 88
Vibration levels, a
Handle right, m/s
Handle left, m/s
(see note 3)
hv
2
2
2,7
4,8
Note 1: Noise emissions in the environment measured as sound power (L
) in conformity with EN 61029-1.
WA
Note 2: Noise pressure level according to EN 61029-1. Reported data for noise pressure level has a typical statistical
dispersion (standard deviation) of 1.0 dB(A).
Note 3: Vibration level according to EN 61029-1. Reported data for vibration level has a typical statistical dispersion
(standard deviation) of 1 m/s
2
.
28 - English
Technical Data
EC-declaration of conformity
(Applies to Europe only)
Husqvarna AB, SE-433 81 Göteborg, Sweden, tel: +46-31-949000, declares under sole responsibility that the Husq-
varna PG 680, PG 820, from 2010´s serial numbers and onwards (the year is clearly stated in plain text on the rating
plate with subsequent serial number), conforms with the requirements of the COUNCIL’S DIRECTIVE:
• of May 17, 2006 “relating to machinery” 2006/42/EC
• of December 15, 2004 ”relating to electromagnetic compatibility” 2004/108/EC.
• of December 12, 2006 ”relating to electrical equipment” 2006/95/EC.
The following standards have been applied: EN ISO 12100:2003, EN 55014-1:2006, EN 55014-2/A1:2001, EN 61000-
3-2:2006, EN 61000-3-3/A1/A2:2005, EN 13862/A1:2009.
Göteborg December 29, 2009
Henric Andersson
Vice President, Head of Power Cutters and Construction Equipment
Husqvarna AB
(Authorized representative for Husqvarna AB and responsible for technical documentation.)
English - 29
Índice
30 - Spanish
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