National GP30 User manual

Read Manual Before Operating Machine
402600 Rev B
GP30 GRINDER
OPERATING MANUAL

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Table of Contents
1.0 Technical Data.............................................1
2.0 Safety Instructions .........................................2
3.0 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.0 Transportation.............................................8
5.0 Starting the Machine .......................................9
6.0 Operation of the Machine...................................11
7.0 Maintenance Schedule.....................................12
8.0 Troubleshooting / Diagnostics ..............................12
9.0 Reference Guide & Procedures..............................13
10.0 Warranty ................................................21
Please note: The following safety instructions must be followed as
shown in this operating manual. Failure to do so may result in
hazard to health or possible death.

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1.0 Technical Data
1.1 Rating
1.2 Unit Specifications
1.3 Operative Range and Correct Usage
1.4 Stand-by Power Supply (Generator)
1.5 Advice for Operators of Grinding Machines
1.6 Machine Type Designation
1.1 Rating
Machine: GP30 Grinder
Manufacturer: National Flooring Equipment (NFE)
9250 Xylon Ave. N
Minneapolis, MN 55445
1.2 Unit Specifications
Dimensions:
Length 86 in 218 cm
Width 30 in 76 cm
Height 52 in 132 cm
Weight 1,320 lbs 599 kg
Connected loads of the electrical system:
Power 30 HP
Electrical Connection 220/230 VAC 3-Phase 60 Hz
1.3 Operative Range and Correct Usage
The GP30 is designed to be used on clean, dry or wet horizontal surfaces without
obstacles. The machine cannot be used for other purposes. The manufacturer will not
be liable for damages resulting from incorrect usage. In case of wrong usage the user is
responsible for all risks.
1.4 Stand–by Power Supply (Generator)
If the GP30 is operated using a generator, the generator must be operated in accordance
with the current local electrical directives (this applies in particular to the protective
ground conductor) to ensure that all safety devices are functioning and ensure the ability to
eliminate possible damage to electrical components.

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1.5 Advice for Operators of Grinding Machines
During the operation of the GP30 it may be possible to exceed the acceptable noise
level of 85 dB(A). This is dependent on the different locations and the local circumstances.
When the noise level is 85 dB(A) or more, the machine operator and the persons working near
the machine must wear sound-insulating devices.
1.6 Machine Type Designation
Machine Type: GP30
Working Width: 30 in (72cm)
Drive: Manual
Grinding Capacity: Variable
Dust Hose Connection: 3 in (76mm) x 25 ft (8m)
2.0 Safety Instructions
2.1 Explanation of Warnings and Symbols
2.2 Organizational Measures
2.3 Personnel Selection and Qualification
2.4 Safety Precautions Applicable to Different Operating Conditions
2.5 Repair Work, Maintenance Activities, and Default Repair on the Jobsite
2.6 Safety-off Position
2.7 Dangerous Aspects of the Machine
2.8 Electrical Engineering Regulations
2.9 Special Instructions
2.1 Explanation of Warnings and Symbols
The following symbols are used in this manual to highlight areas of particular
importance:
Operational Safety
Safety precautions that are to be taken to ensure prevention of injury.
Safety Goggles / Ear Protection
Information, instructions, and restrictions with regards to possible risks to persons or
extensive material damages.
Electrical Warning
Warning against dangerous voltages.

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2.2 Organizational Measures
The Operating Instructions are to be kept near where the machine is located and must
be reachable at all times.
In addition to this manual, general and legal regulations regarding accident prevention and
environmental protection must be complied with. These may for example relate to the handling of
hazardous substances or to the provision and wearing of personal protection equipment, as well
as compliance with local traffic regulations. This manual must be supplemented by instructions
containing the duty to supervise and report particular local working practices, work organization,
work procedures, and personnel allocation.
Personnel working with or on the machine must have read this manual before starting work; in
particular the section on safety.
From time to time the working practices of the staff are to be checked for awareness of safety and
hazards.
Personnel must tie back long hair and not wear loose clothing or jewelry. There is a risk of injury if
loose items become stuck or are drawn into moving machinery.
Use personal protection equipment if necessary or required by regulations. Take notice
of all safety and hazard notices on the machine.
All safety and hazard notices on the machine must be kept complete and legible. For replacement
labels, contact NFE.
If safety-critical changes occur to the machine or its performance, the machine must be shut down
immediately! The cause of the fault must be established and repaired before starting the work
again.
Changes, add-ons, or conversions to the machine which might have an influence on the
safety of the machine must not be undertaken without the permission of the manufacturer.
Spare parts must always comply with the technical requirements and the specifications of the
manufacturer. This is always guaranteed when using spare parts from NFE.
Inspection intervals specified in this manual must be complied with. At the same time it is necessary
to meet the legal requirements.
The location and the operation of fire extinguishers must be made known on each building site.
Take note of the procedures for fire reporting and fighting fires.
2.3 Personnel Selection and Qualification
Only reliable personnel are allowed to work on or operate the machine. Note the statutory minimum
age. Specify clearly the responsibilities of personnel for operation, setting up, servicing and
maintenance work. Define responsibilities regarding traffic safety regulations and empower operator
to decline instructions from third parties which are not complying with the safety requirements.
Personnel being trained may only be deployed under constant supervision of an experienced
operator.

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Work on the electrical parts of the equipment may only be undertaken by a skilled
electrician or by a trained person under the guidance and supervision of a skilled
electrician in accordance with the electrical engineering regulations.
2.4 Safety Precautions Applicable to Different Operating Conditions
Avoid any method of working that impairs safety! All precautions must be taken so that the machine
is only used in a safe and functional status.
Only operate the machine when all safety devices and related safety equipment, e.g.
detachable safety devices, emergency stops, and suction devices, are present and
operational!
The machine has to be visually checked at least once a day for any damage or defects. In the event
of operational malfunctions the machine must be shut down immediately and secured. The fault
must be rectified before starting the machine again.
Secure the work area around the machine in public areas; provide a safety distance of
at least 10 feet around the machine.
All persons in the proximity of the machine must wear safety glasses with lateral
protection, as well as safety shoes. Ear protection may be required. The operator is
obliged to wear close fitting protective clothing.
Use only extension cables that are sized and marked in accordance with the overall power
consumption of the machine and the valid local guidelines.
Before starting the machine, make sure that no one will be endangered when the machines starts
running.
Do not switch off or remove the exhaust or ventilation devices when the machine is
running.
2.5 Repair Work, Maintenance Activities, and Default Repair on the Jobsite
Before starting any service work on the machine, put the machine in the safety off
position (section 2.6) to prevent the machine from being turned on accidentally.
Adjustments, servicing, inspection work, and inspection intervals specified in this manual, as well
as any information on the replacement of parts and systems of the machine must be complied with.
These activities can only be undertaken by qualified personnel. Before starting any maintenance or
repair work, the operator of the machine must be informed about it.
The dust bin of the connected dust collector must be emptied before transportation. Handle in
accordance with the local disposal regulations.
Do not use any aggressive cleaning materials on the machine; use lint-free cleaning cloths.
Always re-tighten any screws that are undone during servicing and maintenance work.

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If safety devices need to be dismantled during setup, maintenance, or repair work, they must be
reinstalled and inspected immediately after completion of the service or repair work.
Make sure that materials and replacement parts are disposed of safely and in an environmentally-
friendly manner.
Make sure that electrical components used for replacement purpose comply with the original parts
and are correctly adjusted if necessary.
2.6 Safety Off Position
The safety off position is the position of the machine when it cannot generate any hazard.
How to put machine in safety off position:
• Turn off the grinder.
• Turn off the dust collector.
• Wait for all drives to stop.
• Pull out main plugs.
• Secure machine against unintended start-up.
2.7 Dangerous Aspects of the Machine
Every machine, if not used according to the regulations, may be hazardous for operating,
setup and service personnel. The operating authority is responsible for compliance with
the safety regulations during operation and maintenance of safety devices supplied with the
machine, as well as the provision of additional safety devices.
2.8 Electrical Engineering Regulations
The machine must only be started when all guards and dust collection parts are attached
and machine is standing flat on work surface.
If work on electrified parts is necessary, a second person must be deployed who can pull out the
plug in an emergency. The working area must be sealed with a red and white safety chain and a
danger sign. Use tools that are insulated against voltages.
Only start work once familiar with the electrical engineering regulations that apply to the area.
Only use voltage testers that comply with the regulations when troubleshooting. From time to time,
check voltage tester to ensure it is operationally efficient.
2.9 Special Instructions
Use proper tools for work. Damaged tools must be repaired or replaced immediately.
Use the required safety equipment and safety clothes (e.g. safety glasses, safety shoes, safety
gloves).

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Instruct operators and repair personnel on the following:
• Cleaning and repair work are only allowed if the machine is shut off and in the safety off position.
• Opening or removing safety devices while the machine is running is not allowed.
• Replace all safety covers and devices after cleaning, repair, or maintenance work.
• Do not touch moving parts and do not walk into the working path of the machine.
• Before restarting machine, make sure all personnel are a safe distance away from the work
area after initial start-up.
3.0 General Information
3.1 Operative Range
3.2 Scope of Supply
3.3 Operating Features
3.4 Electric Motor
3.5 Cutting Area
3.6 Couplers & Tool Plates / Stone Holders
3.7 Variable Speed Drive
3.8 Tooling Change
3.9 Care & Maintenance
3.1 Operative Range
The GP30 is a grinding machine with counter rotating heads that is used for preparation and
polishing horizontal surfaces. Grinding the surface according to NFE specifications thoroughly
removes surface contaminants, coats of paint, sealants, and thin coatings.
A suitable dust collection unit must be connected to the machine in order to collect the dust being
produced by the grinding process. The proper dust collection system ensures dust-free operation
of the machine and clean air at the workspace.
3.2 Scope of Supply
Provided with machine:
• GP30
• Manual (1)
3.3 Operating Features
Key Button Controls Start / Stop
Pushing the key button "Start" will turn the controls on and start the motor. Pushing the key button
“Stop” will stop the motor.

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Up / Down Arrows
While powered on but without the motor running, the red up and down arrow buttons can be used
to set the motor speed faster or slower than the base RPM of the motor.
Rotation
While powered on but without the motor running, the “Rotation” button is used to change the
rotation of the motor. Press the “Rotation” button and press “Enter” within 2 seconds to change the
motor rotation. To change back to previous rotation repeat the process
Auto/Man and Prog/Run
These buttons are for drive diagnostics and programming and are not used by the operator.
"Dead Man" Key
The "dead man" key is intended to be used for the safety of the operator and protection of the
machine from excess damage in the event of an emergency. Lanyard must be worn by operator for
this safety device to work properly. Pull key out to stop the machine motor.
Manual On/Off Switch
The on/off switch is used to turn on or off all power supplied to the grinder.
3.4 Electric Motor
The motor is responsible for turning the gears which turn the abrasive tools on the floor. The motor
is controlled exclusively by the VSD which inputs specific power to generate a given RPM.
3.5 Cutting Area
The area inside the stainless steel shroud and directly beneath the gear deck is the cutting area.
This is the area in which the tools turn to produce the grinding action. It is also the area that keeps
the dust from grinding contained and subsequently evacuated through the dust collection ports.
3.6 Couplers & Tool Plates
The grinder is outfitted with couplers and tool plates. The couplers attach to the tool plates and
provide flex for smooth operation of the diamond tools. The tool plate holds the tools in place for
the grinding application.
3.7 Variable Speed Drive (VSD)
The VSD contains all controls and instruments used for supervision and control of the machine.
The VSD is responsible for monitoring incoming power as well as changing the electronic frequency
to allow the motor to run at different speeds. This unit is a closed panel that is intended to be
operated only with the keypad.

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3.8 Tooling Change
In order to change the tooling, first ensure that the grinder is switched off and disconnected from
the electrical source. Place all pocket weights provided in the weight holders on either side of the
VSD.
Then, push machine down by the handle in a controlled manner until the grinder is resting on the
top casters. Tap the tooling from the outside edging to remove, and install new tooling by sliding
the tooling outward.
Machine must only be tilted back on firm, level surface. There is danger of machine
falling if all weights are not used and surface is not level.
3.9 Care & Maintenance
Regular maintenance of the machine and its parts is imperative for functioning and safety.
In order to prevent unnecessary downtimes, it is recommended to keep original spare and wear
parts in stock.
The following maintenance should take place before and after every operation of
machine:
1. Clean all surfaces with a dry, lint-free cloth.
2. Inspect all electrical cables for cuts and replace damaged cords
3. Check that all electrical connections are secure and snug.
4. Inspect gear box for any signs of oil leakage.
5. Verify functionality of dead man key.
4.0 Transportation
4.1 Transportation
4.2 Transportation by Vehicle
4.3 Operation Conditions
4.1 Transportation
In order to transport the machine from a vehicle to the working area, place the pocket weights in
the weight baskets and tilt the machine back so it rests on the back casters.
When transporting the machine with hoisting equipment like a crane or a lift, check the total weight
permitted (see section 1-Dimensions). Use only qualified hoisting equipment, as well as ropes and
chains.
Do not fix any rope or chain to the handle. The machine must be placed on a pallet or platform
designed to hold the weight of the machine; the platform or pallet can then be lifted or hoisted from
the appropriate points.