SPE DFG500-2 User manual

DFG500-2
Twin Speed
Diamond Floor Grinder
Operating Manual
This manual is provided to persons purchasing an
SPE machine and may not be reproduced in part or full
without written permission of
SPE International Ltd.
This manual provides the basic information required
and is only to be used as a guideline.
The SPE machines are manufactured and covered by
SPE design registrations granted and pending.
SPE International Ltd reserves the right to alter the
equipment design and specification as required
without notice.
The SPE product range is subject to amendment and
improvement as a result of on going research
Honeyholes Lane, Dunholme, Lincoln LN2 3SU, England
Tel: [phone] Fax: [phone]
Email: [e-mail]

DFG500 - 2
Operating Manual
DFG500 Twin Speed
Diamond Floor Grinder
OPERATING MANUAL
This manual covers to the best of our knowledge the operation and maintenance of the
DFG 500 - 2 diamond floor grinder. Before operation of the equipment the manual should be
read and understood by the operator. The safety regulations must be followed at all times.
Service of electrical and hydraulic components should be carried out by authorised personnel.
Failure to follow these instructions could result in damage to the machine and/or serious
personal injury or death.
WARNING
Failure to follow these instructions may result in serious personal injury or death. SPE
disclaims all responsibility for damage to persons or objects arising as a consequence of
incorrect handling of the machine and failure to inspect the machine for damage or other faults
that may influence the operation prior to starting work.

DFG500 - 2
Operating Manual
INDEX
Page No
1 Starting Work
2 Changing Grinding Plates
Wet Grinding
Weights
3 Maintenance
4 Safety
5-6 Reversing Phases
Twin Speed Operation
7-8 Accessories
9 Spare Parts Breakdown
10 Body Components
11 Drive Components
12 Undercarriage Components
13 Hydraulic Components
14 Electric, Vacuum & Water Components
15-16 Wiring Diagram
17 Electrical Components
18 Specifications
19 Noise/Vibration Assessment
20 Warranty
21 Declaration of Conformity
22 Conditions of Sale

DFG500 - 2
Operating Manual
STARTING WORK
BEFORE STARTING WORK CHECK SET UP OF THE MACHINE AND GRINDING
PLATES HAS BEEN COMPLETED.
1. Ensure the power supply is correct.
DFG 500 - this should be a 380/415v 32 amp supply from the mains or generated with a
minimum of 20 kva on 50 cycles.
2. DFG 500 - the plug on the machine is a 380/415v 32 amp red plug.
3. After connecting the machine to the power supply, turn the red isolator switch to the On
position red light will illuminate on the electric panel. To check that the 3 phase power
supply is phased to suit the machine, press the raise and lower buttons on the handle bar.
If the machine works correctly on the buttons the supply is phased to suit the machine. If
not 2 of the 3 phases must be reversed – see page 5.
4. Raise the machine high enough to gain access to the dust skirt, slacken the screws thus
ensuring the skirt is free to move up and down as required.
5. Lower the machine on to the grinding plates and make sure the jockey wheels are free
moving and off the floor surface.
6. It is vital that the machine should grind the floor along the same plane (Incorrect set-
up will result in uneven diamond wear, deep grinding marks, vibration and damage
to flexible couplings that support the heads).
7. Set the machine down on the floor to be prepared and check the level of the floor with a
spirit level. Place the spirit level on the front side of the machine and adjust the rear wheel
height using the black hand wheel until the level of the machine is the same as the level of
the floor. Then lock the hand wheel.
8. Fit the dust skirt to the correct height, approx 0.5mm clear of the floor and tighten up set
screws.
9. Lift the floor grinder up on to the jockey wheels using the raise button on handlebar.
Examine grinding plates for any damage and check allen screws bolts are tight – see page
2 changing grinding plate for torque settings. Connect vacuum hose or water supply to
control dust. WARNING – DO NOT ALLOW WATER TO MAKE CONTACT WITH ANY
ELECTRICAL COMPONENTS. The floor grinder is now ready to commence work.
10. Start both motors up by pressing the start buttons one at a time and allow the machine
to run for approximately 30 seconds.
11. Lower the machine on to the floor whilst moving the machine either forwards or
backwards. Try to grind the surface in a figure of eight pattern for best finish.
12. When lifting machine to cease grinding the heads should be lifted off the floor slowly
with the dust extraction still operating in order to allow the dust to clear from the work area.
13. If the operator has any difficulty whilst operating the machine press the red stop button
located at the back of the machine.
NEVER ALLOW THE MACHINE TO REMAIN STATIONARY WHILST THE PLATES ARE
ROTATING AND IN CONTACT WITH THE SURFACE.
NEVER CHANGE SPEED SETTING WHILST MACHINE IS IN USE – SEE PAGE 5
1

DFG500 - 2
Operating Manual
CHANGING GRINDING PLATES
1. Make sure heads have stopped rotating, lift the DFG off the floor to its maximum height.
2. Disconnect from power supply.
3. Tilt the machine backwards on to its handles. The machine must be secured and
supported.
4. Make sure the grinding plate is cool to the touch.
5. Use an 8mm Allen key to undo the countersunk screws securing the diamond plate to
the flexible couplings.
6. Remove grinding plate and replace.
7. Ensure grinding plates are seated to coupling correctly prior to tightening counter sunk
screws diagonally to a maximum torque of 75Nm.
8. Lower the machine back to an upright position.
9. Reconnect to the power supply.
10. Two equally worn heads must be fitted as a pair.
11. Set the machine level to floor, see starting work.
CHECK FOR CORRECT WEAR RATE AFTER QUARTER OF AN HOUR AND AGAIN AT
HALF AN HOUR INTERVAL. - THIS WILL GIVE AN IDEA OF WEAR RATE
SEE SPECIFICATION SHEET FOR AVAILABLE PLATES – SEE PAGES 7-8
12. Adjust machine level as the plate reduces through wear.
WET GRINDING
When grinding wet a hose is connected to the water tap on the side of the machine where
an adjustment handle for the water supply is mounted. The water is ejected forward under
the grinding plate.
When grinding wet the machine should still not be allowed to stop moving whilst the plates
are in contact with the surface
WARNING: DO NOT ALLOW WATER TO MAKE CONTACT WITH ANY ELECTRICAL
COMPONENTS
WEIGHTS
It is recommended that the ballast weights are removed at the commencement of grinding
and ONLY ADDED if an increased pressure is needed on the surface.
2

DFG500 - 2
Operating Manual
MAINTENANCE
AFTER USE:
- Clean the machine to remove all build up of dust and surface residue. If using a hose
pipe or pressure washer take care that water is not directed onto electrical components
and switches.
(Note: Motors and switches are not waterproof)
- Ensure the height adjustment thread is cleaned and then lightly oiled. Periodically it
should be removed and the female, threaded section cleaned out and oiled to maintain a
light, smooth height adjustment.
- The drive belts will give a long and trouble free operating life if basic procedures are
followed. The drive belts are tensioned by sliding the motor along the adjusting slots. It is
important that the drive belt is not over tensioned. Serious damage could be caused to
the drive shaft, drive shaft bearings and drive motor if the belt is excessively tight.
- All components should be checked daily for tightness and the drive belts for tension
weekly.
- The flexible drive couplings that support the grinding heads should be checked on a
weekly basis, the couplings should be firm without excessive movement.
- Any excess vibration due to uneven headwear should result in the heads being changed
to eliminate damage to couplings and bearing assembly support units.
3

DFG500 - 2
Operating Manual
SAFETY
Only trained operatives should be allowed to work the DFG500 range of floor grinders.
Note: It is possible that the noise level produced by the Diamond Floor Grinder could
exceed 90dbA. Appropriate PPE must be worn and the equipment must be used in line
with guidelines laid down by the Health & Safety Executive.
Never leave the DFG500 unattended whilst in use. Always stop the motors and lift the
heads of the machine prior to leaving the machine.
Always ensure that all power leads and hoses are disconnected before attempting to
service the machine. Never tip the machine backwards until the grinding plates have
stopped rotating and the machine has been isolated at main supply.
Noise and vibration will occur at various levels dependent on the attachments and work being
completed. SPE have assessments conducted under test conditions detailed in the operating
manual, see page 19. However, it is recommended that additional tests are taken on site to
provide the operator with accurate information on using the equipment within the guidelines
laid down by the Health & Safety Executive.
NOTE:
1. NEVER OPERATE THE DIAMOND FLOOR GRINDER WITHOUT BELT GUARDS
FITTED
2. NEVER OPERATE THE DIAMOND FLOOR GRINDER OUTDOORS IN WET
CONDITIONS AS THE ELECTRICAL COMPONENTS ARE NOT WATERPROOF
4

DFG500 - 2
Operating Manual
REVERSING PHASES
If the machine does not raise or lower correctly on the buttons on the handle bar, the power
supply is phased incorrectly for the machine. Disconnect power cable and reverse phases
as shown on page overleaf.
Reconnect power cable and retest. If the phases have not reversed and machine does not
work correctly, seek advice of qualified electrician.
TWIN SPEED OPERATION
The DFG500-2 is fitted with a switch located on the electric panel allowing a high and low
speed grinding option. The high speed setting is recommended for the majority of
applications such as concrete grinding and coating/adhesive removal. The slow speed
setting is recommended for polishing applications using the polymer diamond system.
The speed setting must be selected prior to starting the grinding heads.
DO NOT CHANGE SPEED SETTING DURING USE AS THIS MAY CAUSE SERIOUS
DAMAGE TO ELECTRICAL COMPONENTS.
5

DFG500 - 2
Operating Manual
Part No
Description
Application
6401
Economy grade 250mm
10 segment (blue)
Economical removal of most types of
adhesives and surface contaminants.
Excellent for using on rougher surfaces as a
first grind. Can be used wet or dry.
6402
Super Agressive 250mm
10 segment (red)
Designed for the removal of S/L and epoxy
coatings in a commercially viable way. Can
be used for the majority of aggressive
grinding applications and will give extended
wear on heads.
Can be used wet or dry.
6403
Standard Grade 250mm
16 segment (blue)
Removal and grinding of most types of
concrete floor in preparing for follow on
coatings. General all purpose head for most
grinding works.
Can be used wet or day.
6404
High performance 250mm
20 segment (blue)
Fast removal and grinding of most types of
plain and painted concrete floors. Will key
floors for coatings, removal of high spots, lip
edges etc. Suitable for first and second
stage grinding to terrazzo and aggregated
seamless floors.
Can be used wet or dry.
6405
Button head 250mm
16 segment (blue)
For the removal of the thicker adhesive on
sand / cement screed whether open or
closed. Will cope with large volume areas in
a cost effective manner. To be used with
softer elastomeric and thin film coatings.
6408
Polymer diamond backing plate
Backing drive plate for the polymer diamond
system.
Takes 16 polymer button inserts.
7
Accessories

DFG500 - 2
Operating Manual
6420
6409
6410
6411
6412
6413
6414
GREEN ULTRA COARSE 16no
BLACK EXTRA COARSE 16no
BROWN COARSE 16no
RED MEDIUM 16no
YELLOW FINE 16no
WHITE EXTRA FINE 16no
BLUE ULTRA FINE 16no
Polymer diamond system to be used only on
the DFG 500 twin speed (slow speed option)
for second stage grinding and polishing of
terrazzo, stone and marble etc. The buttons
fit securely into the aluminium backing plate.
Wet use only.
6422
6423
COARSE STEEL POLYMER
16No
MEDIUM STEEL POLYMER
16No
Steel polymer diamond system to be used
on DFG 500 twin speed (slow speed option).
For second stage grinding and finishing of
cementitious, polyurethane and epoxy
based terrazzo, terrazzo tiles and concrete
flooring. Provides rapid action and long life.
Wet use only.
6403C
Fine grit 250mm 16 segment (purple)
Finishing and polishing of cementitious
polyurathane, epoxy based terrazzo,
terrazzo tiles and decorative aggregated
concrete flooring.
Can be used wet or dry.
6415
Carborundum grinding and wire brush
block holder drive plate.
Drive plate for the carborundum grinding
blocks and wire brush blocks.
6416
6417
6418
Carborundum grinding blocks
Fine
Medium
Coarse
For economical polishing and grinding
removal of high spots, over watered slabs,
rain damaged slabs, lip edges etc.
6419
6421
16 gauge round wire block
Spring steel block
General scarifying, removal of rubber carpet
backing, grease and oil build-up without
damage to substrate.
8

DFG500 - 2
Operating Manual
9

DFG500 - 2
Operating Manual
DFG500 TWIN SPEED
ELECTRICAL COMPONENTS
QTY
DESCRIPTION
SPE PART NO
1
Panel
SP58017
1
Back Panel
SP55817
7
Contactor
-
1
Aux Switch
SPLADN40
2
Overload
SPLRD12
2
Overload
SPLRD16
1
Stop Switch
SPZB4BZ102
2
Start Switch
SPZB4BZ101
2
Start Button
SPZB4BA3
1
Stop Button
SPZB4BS44
1
Lens
SPZB4BV04
1
Panel Lamp
SPZB4BV5
2
Switch Box
SPXALBO1
4
Contact Switches
SPXENL1111
2
Start Button
SPZA2BA3
2
Trip
SPC60HD316
1
Trip
SPC60HD304
1
Trip
SPC60HC202
2
Glands
-
3
Brass Bushes
-
1
Coupler
-
4
Glands
9258/200
1
Glands
-
1
Isolator
SPFWA4/3C
1
Transformer
5020A
1
32amp 5Pin Phase Rev.
surface Plug
SP630PH
4
Bobbins
9245/500
1
700/400 R.P.M. Sticker
-
2
Conversion Kit
-
1
Two Speed Switch
-
1
N/O X N/C Contact Block
-
1
N/O Contact
-
1
N/C Contact
-
17