Blastrac BG-250E User manual

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BG-250E &
BG-250P
Version 1.1
Operating manual BG-250E & BG-250P
O
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manual

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Operating manual BG-250E & BG-250P 2/12
Table of contents
ECDeclarationofConformity 02
1. Introduction 04
2. Machinedescription 04
Application
Accessories
3. Safety 05
Safety precautions
Safety regulations
Safety instructions
4. Initialoperation 07
Checkpoints of electrical safety
Checkpoints of machine safety
Removing the diamond disc
Mounting the diamond disc
5. Operating 08
Switch on the BG-250E
Switch off the BG-250E
Switch on the BG-250P
Switch off the BG-250P
Operating during grinding
6. Maintenance 10
Replacing the flexible coupling
7. Technicaldata 11
Contact 12

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Operating manual BG-250E & BG-250P 3/12
1. Introduction
It is important that all persons who are working or maintaining with this machine will
read the manual carefully and understand it fully. Keep this manual near to the machine,
so it can always be consulted.
Only authorized and trained personnel may operate this machine.
2. Machine description
The BG-250 is an electric or gas driven floor grinding machine for treating horizontal
surfaces.
The machine has a rotating adapter plate where the diamond disc can be fixed on
The rotating parts are covered by a protection cap with a connection for a dust hose.
With a suitable Blastrac dust collector you can work without causing dust.
Application
The BG-250 can be used on almost any floor to plane, to remove coatings or glue
residues or to make ready for coatings.
1 Steer handle 7 Drive motor 13 Flexible coupling
2 Cord & key for deadman switch 8 Lifting handles 14 Lever handle
3 On / Off emergency switch 9 Dust cap 15 Gas throttle
4 Socket with phase inverter 10 Brush for dust cap 16 Contact switch
5 Dust hose connection 11 Bearing unit 17 Stop button
6 Lifting eye 12 Grinding disc 18 Machine support

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Operating manual BG-250E & BG-250P 4/12
3. Safety
Before operating the machine, the personnel must be familiar with the safety instructions
given in this manual.
Keep this manual with the machine, so it can always be consulted.
Safety precautions
The surface to be treated must be swept clean to remove stones, screws etc.
Never use the machine when the surface is not clear and if there is a risk of
tripping.
Be careful with water on the treated surface. Electrical cables must not come into
contact with water.
Remove any electrical cable and or dust hose from the surface to be treated
Always use a dust collector when grinding dry.
Don’t get disturbed during the activities.
Safety regulations
Persons who are not operating the machine must not be permitted to stay in the
surrounding area of the machine.
Don’t change anything on the machine. Use always cables which are approved and
grounded cables. The machine is always equipped with a grounded connection, do
not change this and use always grounded cables with a grounded plug.

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Operating manual BG-250E & BG-250P 5/12
Connect main power supply cable to an installation with a ground leakage circuit
breaker.
Inspect and test the electrical components regularly. The electrical components
have to satisfy the requirements which apply to these components.
Always call a skilled electrician or your distributor when you have questions about
the safety of the electrical components.
Work on electrical equipment or operating materials may only be undertaken by a
skilled electrician or by trained persons under the guidance and supervision of a
skilled electrician as well as in accordance with the electrical engineering
regulations.
Disconnect the main plug (on electrical versions) during inspection, maintaining,
disc change and/or repairing on the machine.
Never use the machine in the rain.
The machine contains rotating parts, so always leave the diamond disc on the floor
while the motor is turning.
The flexible coupling can become obsolete with use, because of this there can be
higher vibrations than normal. Check for this reason regularly the flexible
coupling.

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Operating manual BG-250E & BG-250P 6/12
The following sticker is placed on the machine.
Meanings of these symbols are:
Ear protection is obliged
Safety glasses with lateral protection are obliged
CE-mark on this machine
Safety shoes obliged
Consult the manual before operating the machine
Personnel must tie back long hair and not wear loose clothing or jewellery including rings.
Wear gloves and dust mask during operating the machine.
Safety instructions
Do not stand the machine on the diamond disc or coupling when it is not in use,
this will cause deformation to the flexible coupling. Put the machine always on the
machine support which is made for this reason.
Make sure the machine is clean and that the handgrips are dry and free of grease
and oil.
Make sure the brush seals are in good condition, this to avoid dust.
Disconnect the main plug (on electrical versions) when changing the disc or
flexible coupling.
It is not allowed to lift the machine without use of appropriate appliances as a lift
or crane.
Lift the machine up on the lifting eye.

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Operating manual BG-250E & BG-250P 7/12
4. Initial operation
Before using the machine it is committed to inspect the machine.
It is not permitted to use the machine if the machine safety is not according the
checkpoints below.
Checkpoints for electrical safety
Use only extension cables for extending the main cable that are sized and marked
in accordance with the overall power consumption of the machine.
Electrical cables must be rolled entirely off of the reels.
Any damage to electric cables is not permitted
Use an electrical power supply connection with earth connection
Be careful with water on the treated surface. Electrical cables must not come into
contact with water.
Checkpoints of machine safety
Check if:
The safety functions and operating functions work correct.
The flexible coupling is not deformed or damaged
The diamond disc is not damaged
There are no damages on the electrical components.
There is no oil or petrol leaking out of the petrol engine.
There are not any loose nuts or bolts
There is no damage to the dust hose and if it is connected well.
Removing the diamond disc
Make sure the key of the deadman switch and the power supply plug (on electrical
versions) are out of the machine
Lay down the machine so it is lying on the handle. Make sure the machine will not
fall back down. A second person can stands on the handle to make sure it will not
fall back down.
Loosen the 4 bolts with an appropriate key.
Remove the diamond or multiflail disc.
Mounting the diamond disc
Make sure the power supply plug is out of the machine.
Lay down the machine so it is lying on the handle. Make sure the machine will not
fall back down. A second person can stands on the handle to make sure it will not
fall back down.
Fix the diamond or multiflail disc underneath the adapter plate and turn the 4
bolts with an appropriate key tight.

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Operating manual BG-250E & BG-250P 8/12
5. Operating
During operating the BG-250, the following additional safety instructions must be
followed closely.
Switch on the BG-250E
Turn on the dust collector before switching on the machine.
Connect the dust hose with the machine
Stand behind the machine
Make sure that the machine stands on the machine support.
Take the steering handle (2) with one hand and push the start button (3)
•Check if the machine turns the right direction. The fan has to turn clockwise when
looking on top of the fan.
•If not, push the stop button (4) and turn the phase inverter in the socket (5) and
start the machine again.
•Lift the machine support with the lever handle (6) and let down the machine till
the diamond disc hits the floor
•Start grinding
Switch off the BG-250E
Push the red button (4) on the electrical box
Wait until the machine stops rotating before
you set the machine on the support with the
lever handle (6)
Disconnect the main power supply
Shut down the dust collector.

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Operating manual BG-250E & BG-250P 9/12
Switch on the BG-250P
Turn on the dust collector before switching on the machine.
Connect the dust hose with the machine
Open the fuel valve (1)
Stand behind the machine
Make sure that the machine stands on the machine support.
Put the cord of the deadman switch (2) on to your arm or put it on to your
clothing.
Check if the key of the deadman switch (2) is in and the emergency stop button
(6) is turned up.
Take the steering handle (3) with one hand pull the gas throttle (4) up to the half
and turn the contact switch (5) to start the engine.
•When the accu is empty, the machine could
always be started with the cord (7)
•Lift the machine support with the lever
handle (8) and let down the machine till the
diamond disc hits the floor
•Start grinding and pull the gas throttle (4)
for more grinding speed.
Switch off the BG-250P
Push the gas throttle (4) to the front.
Push the red button (6)
Wait until the machine stops rotating before
you set the machine on the support with the
lever handle (8)
Pull out the power supply and the key of the
deadman switch (2)
Close the fuel valve (1)
Shut down the dust collector.
Operating during grinding
To get an optimum result during grinding, the machine may not stand still. The machine
must always be in movement so it does not grind to deep into the floor. Move the
machine from left to right and from forward to backwards to get a nice flat result.

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Operating manual BG-250E & BG-250P 10/12
6. Maintenance
Work only with original Blastrac parts.
Check regularly to see if the diamond disc is in good condition. Replace immediately the
diamond disc when this is damaged or worn out.
Check if the flexible coupling is stiff enough after every day working. Replace if any
deformation or damage is found.
Unusual vibrations on the machine check immediately the diamond disc and flexible
coupling
Replacing the flexible coupling:
Pull out the key of the deadman switch. (gas
version)
Pull out the main plug (electric version)
Remove the diamond disc
Remove the dustcap
Loose the bolts of the adapter plate and the
flexible coupling
Take a new flexible coupling (part number:
000118-3) and 12x new bushes (part
number: 000118-3/BUSH) assemble this
together with the adapter plate on the fixed
coupling on the motor axle.
Mount the dustcap.
Prevent premature wear by keeping the machine as
dust free as possible. Clean the machine for this
reason regularly with a dust collector
Clean the machine every day with air and non-
aggressive materials. Never use a high pressure
water cleaner to clean the machine.
Remove the diamond disc after using the machine
Store the cleaned and dry machine in a dry and humid free room. Protect the electrical
motor from moisture, heat, dust and shocks.
All repair work must to be done by qualified Blastrac personnel, this to guarantee a safe
and reliable machine.
Any guarantee on the machine is expired when:
Non original Blastrac parts and diamond discs have been used
Repair work is not done by qualified Blastrac personnel
Changes, add on´s or conversions are undertaken without written permission of
Blastrac.

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Operating manual BG-250E & BG-250P 11/12
7. Technical data
BG250EMKII BG250PMKII
Power consumption 5hp 13hp
Electrical connection 230V / 60Hz -
Diameter diamond disc 10” 10”
Working width 10” 10”
Rotation speed 1950 min-1 2000 min-1
Length 4’ 4’
Width 1.5’ 1.5’
Height 3.5’ 3.5’
Weight 322 lbs 313 lbs
Disc pressure 121 lbs 110 lbs
Noise level (under load) 83dB(A) 90dB(A)
Dust hose connection 3” 3”
Suitable filter unit Contact Blastrac
We will assist you with a properly matched unit
Design and specifications are subject to change without notice by Blastrac

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Operating manual BG-250E & BG-250P 12/12
Blastrac
13201 North Santa Fe Avenue
Oklahoma City, OK 73114
Tel: [phone]
Fax: [phone]
www.blastrac.com