Retsch GM 300 User manual

© Retsch GmbH, 42781 Haan, Retsch-Allee 1-5, Germany 12.11.2012 0006
Manual
Knife Mill GM 300
Translation

2
Copyright
© Copyright by
Retsch GmbH
Haan, Retsch-Allee 1-5
D-42781 Haan
Federal Republic of Germany

3
1Notes on the Operating Manual ............................................................................................................5
1.1 Explanations of the safety warnings.................................................................................................. 6
1.2 General safety instructions ................................................................................................................ 7
1.3 Repairs............................................................................................................................................... 8
2Confirmation ...........................................................................................................................................9
3Transport, scope of delivery, installation..........................................................................................10
3.1 Packaging........................................................................................................................................ 10
3.2 Transport.......................................................................................................................................... 10
3.3 Temperature fluctuations and condensed water ............................................................................. 10
3.4 Conditions for the place of installation............................................................................................. 10
3.5 Removing the transport safeguard .................................................................................................. 11
3.6 Installation of the machine............................................................................................................... 11
3.7 Electrical connection........................................................................................................................ 11
3.8 Type plate description...................................................................................................................... 11
4Technical data.......................................................................................................................................13
4.1 Use of the machine for the intended purpose.................................................................................. 13
4.2 Protective equipment....................................................................................................................... 13
4.3 Emissions......................................................................................................................................... 14
4.4 Degree of protection ........................................................................................................................ 14
4.5 Drive output...................................................................................................................................... 15
4.6 Rated power .................................................................................................................................... 15
4.7 Rated voltage................................................................................................................................... 15
4.8 Rotation speed................................................................................................................................. 15
4.9 Dimensions and weight.................................................................................................................... 15
4.9.1 Height with Hood Cover Closed................................................................................................... 15
4.9.2 Height with Hood Cover Open..................................................................................................... 15
4.9.3 Weight.......................................................................................................................................... 15
4.10 Required floor space........................................................................................................................ 15
5Operating the machine ........................................................................................................................16
5.1 Views of the Instrument................................................................................................................... 16
5.2 Operating elements and displays .................................................................................................... 17
5.3 Overview table of the parts of the device ........................................................................................ 19
5.4 Switching On and Off....................................................................................................................... 20
5.5 Opening and closing of the grinding chamber................................................................................. 20
5.6 Handling the Knife ........................................................................................................................... 20
5.7 Inserting the grinding jar .................................................................................................................. 22
5.7.1 Grinding container - use with different materials ......................................................................... 24
5.8 Grinding Jar Lid Sealing Rings........................................................................................................ 24

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5.9 Starting the grinding process........................................................................................................... 25
5.10 Interrupting and continuing the grinding process ............................................................................ 25
5.11 Stopping the grinding process......................................................................................................... 25
5.12 Menu structure................................................................................................................................. 26
5.12.1 Setting Possibilities on the Display Menu................................................................................ 26
5.13 Setting the grinding time.................................................................................................................. 28
5.14 Setting the Speed ............................................................................................................................ 28
5.15 Setting the Direction of Rotation...................................................................................................... 29
5.16 Setting the interval........................................................................................................................... 29
5.17 Emergency unlocking ...................................................................................................................... 29
6Working instructions............................................................................................................................31
7Fault messages.....................................................................................................................................31
8Cleaning and service ...........................................................................................................................32
9Accessories ..........................................................................................................................................34
10 Disposal.................................................................................................................................................35
11 Index ......................................................................................................................................................36
Appendix ............................................................................................................................... following pages

Notes on the Operating Manual
5
1 Notes on the Operating Manual
This operating manual is a technical guide on how to operate the device safely and
it contains all the information required for the areas specified in the table of
contents. This technical documentation is a reference and instruction manual. The
individual chapters are complete in themselves.
Familiarity (of the respective target groups defined according to area) with the
relevant chapters is a precondition for the safe and appropriate use of the device.
This operating manual does not contain any repair instructions. If faults arise or
repairs are necessary, please contact your supplier or get in touch with Retsch
GmbH directly.
Application technology information relating to samples to be processed is not
included but can be read on the Internet on the respective device’s page at
www.retsch.com.
Changes
Subject to technical changes.
Copyright
Disclosure or reproduction of this documentation, use and disclosure of its contents
are only permitted with the express permission of Retsch GmbH.
Infringements will result in damage compensation liability.

Notes on the Operating Manual
6
1.1 Explanations of the safety warnings
In this Operating Manual we give you the following safety warnings
Serious injury may result from failing to heed these safety warnings. We give you
the following warnings and corresponding content.
WARNING
Type of danger / personal injury
Source of danger
–Possible consequences if the dangers are not observed.
•Instructions on how the dangers are to be avoided.
We also use the following signal word box in the text or in the instructions on action
to be taken:
WARNING
Moderate or mild injury may result from failing to heed these safety warnings.
We give you the following warnings and corresponding content.
CAUTION
Type of danger / personal injury
Source of danger
–Possible consequences if the dangers are not observed.
•Instructions on how the dangers are to be avoided.
We also use the following signal word box in the text or in the instructions on action
to be taken:
CAUTION
In the event of possible property damage we inform you with the word
“Instructions” and the corresponding content.
NOTICE
Nature of the property damage
Source of property damage
–Possible consequences if the instructions are not observed.
•Instructions on how the dangers are to be avoided.
We also use the following signal word in the text or in the instructions on action to
be taken:
NOTICE

Notes on the Operating Manual
7
1.2 General safety instructions
CAUTION
Read the Operating Manual
Non-observance of these operating instructions
–The non-observance of these operating instructions can
result in personal injuries.
•Read the operating manual before using the device.
•We use the adjacent symbol to draw attention to the
necessity of knowing the contents of this operating
manual.
Target group : All persons concerned with the machine in any form
This machine is a modern, high performance product from Retsch GmbH and
complies with the state of the art. Operational safety is given if the machine is
handled for the intended purpose and attention is given to this technical
documentation.
You, as the owner/managing operator of the machine, must ensure that the people
entrusted with working on the machine:
•have noted and understood all the regulations regarding safety,
•are familiar before starting work with all the operating instructions and
specifications for the target group relevant for them,
•have easy access always to the technical documentation for this machine,
•and that new personnel before starting work on the machine are familiarised
with the safe handling of the machine and its use for its intended purpose,
either by verbal instructions from a competent person and/or by means of
this technical documentation.
Improper operation can result in personal injuries and material damage. You are
responsible for your own safety and that of your employees.
Make sure that no unauthorised person has access to the machine.
CAUTION
Changes to the machine
–Changes to the machine may lead to personal injury.
•Do not make any change to the machine and use spare parts and
accessories that have been approved by Retsch exclusively.
NOTICE
Changes to the machine
–The conformity declared by Retsch with the European Directives will lose
its validity.
–You lose all warranty claims.
•Do not make any change to the machine and use spare parts and
accessories that have been approved by Retsch exclusively.

Notes on the Operating Manual
8
Reperaturen
1.3 Repairs
This operating manual does not contain any repair instructions. For your own
safety, repairs may only be carried out by Retsch GmbH or an authorized
representative or by Retsch service engineers.
In that case please inform:
The Retsch representative in your country
Your supplier
Retsch GmbH directly
Your Service Address:

Confirmation
9
Bestätigung
2 Confirmation
This operating manual contains essential instructions for operating and maintaining
the device which must be strictly observed. It is essential that they be read by the
operator and by the qualified staff responsible for the device before the device is
commissioned. This operating manual must be available and accessible at the
place of use at all times.
The user of the device herewith confirms to the managing operator (owner) that
(s)he has received sufficient instructions about the operation and maintenance of
the system. The user has received the operating manual, has read and taken note
of its contents and consequently has all the information required for safe operation
and is sufficiently familiar with the device.
As the owner/managing operator you should for your own protection have your
employees confirm that they have received the instructions about the operation of
the machine.
I have read and taken note of the contents of all chapters in this operating
manual as well as all safety instructions and warnings.
User
Surname, first name (block letters)
Position in the company
Signature
Service technician or operator
Surname, first name (block letters)
Position in the company
Place, date and signature

Transport, scope of delivery, installation
10
3 Transport, scope of delivery, installation
3.1 Packaging
The packaging has been adapted to the mode of transport. It complies with the
generally applicable packaging guidelines.
NOTICE
Storage of packaging
–In the event of a complaint or return, your warranty claims may be
endangered if the packaging is inadequate or the machine has not been
secured correctly.
•Please keep the packaging for the duration of the warranty period.
3.2 Transport
NOTICE
Transport
–Mechanical or electronic components may be damaged.
•The machine may not be knocked, shaken or thrown during
transport.
3.3 Temperature fluctuations and condensed water
NOTICE
Temperature fluctuations
The machine may be subject to strong temperature fluctuations during transport
(e.g. aircraft transport)
–The resultant condensed water may damage electronic components.
•Protect the machine from condensed water.
3.4 Conditions for the place of installation
NOTICE
Ambient temperature
–Electronic and mechanical components may be damaged and the
performance data alter to an unknown extent.
•Do not exceed or fall below the permitted temperature range of the
machine (5°C to 40°C / ambient temperature).
Atmospheric humidity:
Maximum relative humidity 80% at temperatures up to 31°C, decreasing linearly up
to 50% relative humidity at 40°C

Transport, scope of delivery, installation
11
NOTICE
Atmospheric humidity
–Electronic and mechanical components may be damaged and the
performance data alter to an unknown extent.
•Do not exceed the admissible range for atmospheric humidity.
3.5 Removing the transport safeguard
Remove the cardboard cross, which serves to protect the knives during transport),
from the inside of the grinding jar.
3.6 Installation of the machine
Installation height: maximum 2000 m above sea level
NOTICE
Installation of the machine
–It must be possible to disconnet the machine from the mains at any time.
•Install the machine such that the connection for the mains cable is
easily accessible.
3.7 Electrical connection
WARNING
When connecting the power cable to the mains supply, use an external fusethat
complies with the regulations applicable to the place of installation .
•Please check the type plate for details on the necessary voltage and
frequency for the device.
•Make sure the levels agree with the existing mains power supply.
•Use the supplied connection cable to connect the device to the mains power
supply.
3.8 Type plate description
Fig. 1: Type plate lettering
1
2
3
4
5
6
7
8
9
10
11
12
14
13

Transport, scope of delivery, installation
12
1 Device designation
2 Year of production
3 Part number
4 Serial number
5 Manufacturer’s address
6 CE marking
7 Disposal label
8 Bar code
9 Power version
10 Mains frequency
11 Capacity
12 Amperage
13 Number of fuses
14 Fuse type and fuse strength
In the case of questions please provide the device designation (1) or the part
number (3) and the serial number (4) of the device.

Technical data
13
4 Technical data
4.1 Use of the machine for the intended purpose
Target group: Operators
Machine type designation: GM 300
The GRINDOMIX GM 300 laboratory knife mill serves to mill, homogenise and mix
soft to medium-hard, aqueous, fatty, fibrous and dry materials
within seconds
so that they will be suitable for analysis.
It can process sample volumes of up to 4.5 litres quickly and reproducibly.
The GRINDOMIX GM 300 is designed for quantities up to approx. 4500 ml, large
volume materials up to 1000 ml. The feed size is < 130 mm.
It is particularly engineered to cut up the following materials:
fish, meat, vegetables, cheese, fodder pellets, seeds, bacon, sausage, dry bakery
products and pasta, all products with high water, fat and fibrous content and similar
materials.
The GRINDOMIX GM 300 meets the special laboratory and analysis requirements
and in its range of performance it far outstrips that of commercially available
household mixers.
Our applications laboratory will be happy to give you more information.
Fast and gentle size reduction and homogenisation of food
Speed selectable from 500 - 4,000 rpm
Powerful 1.5 KW industrial motor
All parts which come in contact with the sample material are autoclaveable
Easy changing and cleaning of the grinding tools
Interval operation and reverse mode possible
Mode for preliminary size reduction and fine size reduction
Digital parameter preselection
10 parameter combinations can be stored
NOTICE
Area of use of the machine
–This machine is a laboratory machine designed for 8-hour single-shift
operation.
•This machine may not be used as a production machine nor is it
intended for continuous operation.
4.2 Protective equipment
Manual access into the GRINDOMIX GM300 grinding chamber is prevented by an
electromechanical locking device.

Technical data
14
The device can be started only if the housing cover is closed and can be opened
only if the motor has stopped completely.
The actual speed is displayed during operation.
The safety device checks that the grinding jar and cover are in place before the
grinding process can be started.
If the speed deviates by more than 15 %, the device will switch off automatically.
4.3 Emissions
CAUTION
Damage to hearing
The level of noise can be high depending on the type of material,
the knife used, the speed set and the duration of the grinding
process.
- Noise that is excessive in terms of level and duration can cause
impaired or permanently damaged hearing.
•Ensure suitable sound-proofing measures or wear
hearing protection.
CAUTION
Possibility of acoustic signals not being heard
Loud grinding noises
-Acoustic alarms and voice communication might not be heard.
•Consider the volume of the grinding noise in relation to other
acoustic signals in the work environment. You may wish to use
additional visual signals.
Noise characteristics:
The noise is measured in conformance to DIN 45635-031-01-KL3.
The noise characteristics are influenced by the properties of the material being
ground.
Example 1):
Sound-power level LWA = 93.5 dB (A)
Workplace-related emissions level Lp Aeq = 78.7 dB (A)
Operating conditions:
Container = plastic container with cover
Grinding organ = stainless steel knives
Feed material = quartz sand
Feed volume = 2.5 l
Speed = 3000 min-1
4.4 Degree of protection
Grinding chamber and keyboard IP45
In the area of the ventilation slots IP20

Technical data
15
4.5 Drive output
3-phase asynchronous motor with frequency converter
4.6 Rated power
Continuous duty 1.5 KW, peak performance 3 kW
4.7 Rated voltage
–220 - 230 V 50 / 60Hz + 0,1Hz
4.8 Rotation speed
The knife speedcan be set in 100-rpm steps from 500 to 4000 rpm.
4.9 Dimensions and weight
4.9.1 Height with Hood Cover Closed
Height: 340 mm
Width: 440 mm
Depth: 440 mm
4.9.2 Height with Hood Cover Open
Height: 700 mm
Width: 440 mm
Depth: 430 mm
4.9.3 Weight
approx. 30 kg
4.10 Required floor space
440 mm x 440 mm; no safety margins required

Operating the machine
16
5 Operating the machine
5.1 Views of the Instrument
0
Fig. 2: Front view
Fig. 3: Rear view
B
A
C
D
E
F
G
H
I
J
O
M
A
B
N
C
H
L
K
NE

Operating the machine
17
Fig. 4: Detailed views of housing
Fig. 5: Detail of grinding jar disassembly
5.2 Operating elements and displays
P
Q
E
R
S
W
X

Operating the machine
18
Fig. 6: Graphical View of the Control Panel
G
H
I
J
F

Operating the machine
19
5.3 Overview table of the parts of the device
Element
Description
Function
A
Grinding jar cover
Closes the grinding chamber
B
Flap
Prevents interference with the grinding chamber
C
Grinding chamber
Accommodates the sample material
D
Knife
Grinds the sample material
E
Jar holder (base frame)
Accommodates the grinding jar
F
Display window
To check settings and operating conditions
G
Control knob
To adjust the device
H
START button
To start the grinding process
I
STOP button
To stop the grinding process
J
Button to open the flap
Releases the flap lock
K
Not assigned
No function
L
Serial port
Software update and service
M
On/off button
Disconnects device from the power supply
N
Housing fan
Cools the drive
O
Electrical connection
IEC connector
P
Tightening
Is held by the electromechanical interlock
Q
Seal of tightening
Prevents penetration of dirt
R
Cone dome
Seals the knife bearing
S
Bearing flange
Supports the knife shaft
W
Coupler
Connects bearing flange and drive
X
Centring ring
Guides the coupler

Operating the machine
20
5.4 Switching On and Off
•Switch on the mill by pressing the ON/OFF switch (M) at the back.
When the GM300 is switched on for the first time, the language menu is displayed.
You can select your national language here by turning the operating knob (G).
Pressing this knob confirms the selection and the display shows “Open Lid”.
5.5 Opening and closing of the grinding chamber
•Press the (J) key.
The electromagnetic safety interlock opens and the flap can be folded back. The
grinding jar is now freely accessible.
NOTE
After the interruption or end of a grinding process, the flap must be opened once.
Closing the grinding chamber is only possible if the GM300 is connected to the
power supply and the main switch on the back of the device is switched on.
•Shut the housing lid (B) and press it downwards until the lid closure is
activated .
A sensor detects the closure of the housing lid and the motor-driven lid closure is
switched on. The housing lid is closed automatically.
5.6 Handling the Knife
CAUTION
Injuries in the form of cuts
Sharp knife blades
–The knife blades are very sharp and if handled incorrectly, they can lead to
injuries in the form of cuts.
•Touch the knife only at the recessed grips.
•Do not reach into the grinding jar as long as sample material is
covering the knife.
•Only reach into the grinding jar if it is outside the mill.
•Before taking out the knife, remove the sample material until the
recessed grips are free. Use a scraper or shake off the material.
NOTE
Insert the knife before feeding the material to be ground; otherwise, the
material to be cut up can settle between the knife and the driving shaft.