marposs E20N User manual

Manual code No. D2200004UA
Operator’s Manual
E20
E20E20
E20N
NN
N
GRINDER ACOUSTIC CONTROLLER

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NOperator’s Manual
This product is in conformity with the EMC requirements as for the directives:
2004/108/CE
This product is intended to operate in industrial locations; it is not intended for connections
to a public mains network but is intended to be connected to a power network supplied
from a high or medium voltage transformer.
This product is in conformity with the “Electrical Safety” requirements as for the directive
73/23/CEE
Electrical safety
The equipment has been manufactured in conformity with EN 61010-1 specifications.
Manufacturer: Marposs S.p.A.
Address: Via Saliceto 13, Bentivoglio (BO) Italia
www.marposs.com
Manual Code: D2200004UA
Issue: September 1995
Edition: (02) January 2006
Iussed by: Marposs S.p.A. , Via Saliceto 13, Bentivoglio (BO) Italia
MARPOSS S.p.A. does not take on the obligation of notifying possible further
changes to the product.
The descriptions reported in this book do not authorize any tampering by non-
authorized personnel.
The warranty on the equipments will decay if such tamperings are found.
© Copyright Marposs S.p.A. 2006
D2200004UA_02.doc (Save Date 20/01/06 15.47)

3
About the Directive 2002/95/EC “RoHS” regulating the presence of certain
hazardous substances in electrical and electronic equipment.
The Member States of the European Community are in the process of completing
the national reception and enforcement of the Directive 2002/95/EC regulating the
presence of certain hazardous substances in electrical and electronic equipment.
The Directive explicitly excludes from its scope of application finished products
such as those manufactured and sold by Marposs. It is still indeed a widely debated
matter whether the complete removal of the regulated substances could affect the
reliability of the product.
Marposs shares in the social responsibility of continuously supporting every form
of innovation that reduces or minimizes any risk of adverse impact on human health
and the environment.
Marposs is therefore voluntarily pursuing the progressive removal of the
regulated substances from our products. Marposs will do so with the clear
understanding that any improvement achieved on the protection of health and the
environment should not come as a compromise for the quality and reliability of our
products.
Marposs will put the greatest consideration in any initiative that our Customers
undertake with the purpose of reducing the environmental risk. Our commitment is
the support of their effort developing products that be of the highest quality and
reliability.

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Preface
The information contained in this manual are aimed to the following type of operator:
•Machine operator, whose task is to check the correct operation of the system
by means of signallings toward the machine logic.
If necessary, he can olso make interventions on the system is order to adapt it to
the programming and to optimize the times of interventions on the system and
therefore its production.
The instructions refer to all possible configurations of the MARPOSS E20N,so only
the parts relevant to specific application must be considered.
Warning
All servicing or special maintenance operations must be carried out by
authorized personnel

5
List of documentation
1. E20N Configuration – Front Panel................................................................... 7
1.1 E20N Configuration..................................................................................... 7
1.2 Front Panel ................................................................................................. 8
2. GAP control programming............................................................................. 10
2.1 Stable and repetitive background noise.................................................... 11
2.2 Variable and oscillating background noise ............................................... 12
3. CRASH control programming........................................................................ 13
3.1 Programming procedure ........................................................................... 13
4. Troubleshooting and Maintenance ............................................................... 14
4.1 Introduction ............................................................................................... 14
4.2 Alarm conditions ....................................................................................... 14
4.3 Ordinary maintenance............................................................................... 15
4.3.1 Cleaning of the electronic unit........................................................... 15
4.3.2 Cleaning of the contactless microphone........................................... 15
4.4 Extraordinary maintenance ....................................................................... 15
List of drawing
Figure 1: E20N Front Panel ........................................................................................ 8

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E20N Configuration – Front Panel 7
1. E20N CONFIGURATION – FRONT PANEL
1.1 E20N Configuration
•E20N with one GAP channel
The E20N is connected to one microphone for GAP control.
•E20N with one CRASH channel
The E20N is connected to one microphone for CRASH control.
•E20N with two GAP channels in switching
The E20N is connected to one or two microphones for GAP control with two
independent and switching channels.
In case of applications with two microphones, each channel is connected to a
given microphone.
Only one channel at a time is active.
When the E20N is switched on, channel 1 is automatically inserted.
•E20N with one GAP channel + one CRASH channel
The E20N is connected to one or two microphones for gap and crash control:
•Channel 1 for GAP control
•Channel 2 for CRASH control
In case of applications with two microphones, each channel is connected to a
given microphone.
Both channels are active at the same time.

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1.2 Front Panel
1 GAP channel 1 CRASH channel
2 GAP channels 1 GAP channel + 1 CRASH channel
Figure 1: E20N Front Panel

E20N Configuration – Front Panel 9
Elements on the front panel
(reference “Figure 1: E20N Front Panel” on
page 8).
ALED Bargraph scale (20 segments) for the visualization of the sound
detected by the microphone. The color of the graduation of the scale
changes from the value of 6,5, triggering point of the command.
A1 LED to display that channel 1 has been selected.
A2 LED to display that channel 2 has been selected.
BProgramming section of GAP control (see chapter 2 “GAP control
programming” on page 10).
CProgamming section of CRASH control (see chapter 3 “CRASH control
programming” on page 13).
Key for enabling the AGC function (automatic gain control of the sensitivity)
during the programming of the GAP control.
Key for the manual selection of channel 1 or channel 2.

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2. GAP CONTROL PROGRAMMING
The GAP cycle can be controlled with the definition of an appropriate ultrasonic limit
value; this limit must be empirically defined according to the characteristics of the
application.
At first the grinding wheel must be driven to rest position, normally spinning and with
the coolant off . The microphone is already mounted and connected to the E20N unit.
The noise displayed by the E20N LED bargraph in this particular condition is the
background noise which is a basic characteristic of the application.
The value of the displayed background noise can be:
•fairly stable and repetitive
•variable and oscillating.

GAP control programming 11
2.1 Stable and repetitive background noise
Press the key , if present, and select the channel to program.
On the programming area of the selected channel proceed as follows:
1. Bring the selector 1 to the right position
(the LED 3 lights up) to select the fixed
gain control procedure ().
2. Rotate the potentiometer 4 counterclockwise to "zero"
3. Bring the wheel almost in contact with the workpiece, reference pin, etc as in
normal working conditions (wheel spinning at work speed, workpiece rotating,
coolant on, etc)
4. Adjust the sensitivity on potentiometer 4 to amplify the displayed noise slightly
below the value of 6,5 on the graduated bargraph scale and just before the
LED 5 switches off.
5. To verify the programming perform a few cycles and verify that the gap
command is triggered at the right time.
i
Note
If the type of wheel, workpiece, etc. is changed it may be necessary to
reprogram the system.
In case of dressing cycle control, intended as continuity check on the grinding wheel
during the traverse of the dresser, it is necessary to make sure that the command is
triggered when there is a contact between dresser and wheel and it is released when
there is a discontinuity (hole or similar) on the wheel.
The dressing can be considered over when, during a complete traverse, the
command is always triggered.

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2.2
Variable
and oscillating background noise
Press key , if present, and select the channel to program.
On the programming area of the selected channel proceed as follows:
1. Bring the selector 1 to the left position
(the LED 2 lights up) to select the
automatic (variable) gain control
() feature.
2. Rotate the potentiometer 4 counterclockwise to "zero".
3. Bring the wheel almost in contact with the workpiece, reference pin, etc as in
normal working conditions (wheel spinning at work speed, workpiece rotating,
coolant on, etc).
4. Keeping the key pressed adjust the sensitivity on potentiometer 4 to
amplify the displayed noise slightly below the value of 6,5 on the graduated
bargraph scale and just before the LED 5 switches off.
5. To verify the programming perform a few cycles and verify that the gap
command is triggered at the right time.
Warning
The background noise acquisition time is 250 ms from the start cycle so
it is mandatory that the grinding wheel reaches the workpiece, reference
pin, dresser, etc. in a greater time.
i
Note
If the type of wheel, workpiece, etc. is changed it may be necessary to
reprogram the system.
In case of dressing cycle control intended as continuity check on the grinding wheel
during the traverse of the dresser it is necessary to make sure that the command is
triggered when there is a contact between dresser and wheel and it is released when
there is a discontinuity (hole or similar) on the wheel.
The dressing can be considered over when, during a complete traverse, the
command is always triggered.

CRASH control programming 13
3. CRASH CONTROL PROGRAMMING
The CRASH control must be intended as an ALARM signal that is given when the
grinding wheel collides against the workpiece or other devices and/or parts of the
grinder due to a malfunctioning or to a bad programming.
3.1 Programming procedure
Press the key , if present, to select the CRASH channel.
1. Set the sensitivity on the potentiometer
1 approximately to the center of its
range (40-60) or to the same value
relative to the GAP control (in case of
dual channel units)
2. Simulate a few cycles and all the possible machine conditions (grinding,
loading, unloading, dressing, etc) to identify the maximum noise condition
and adjust the sensitivity to have the displayed value just below 6.5 on the
graduated bargraph display of the E20N (triggering point of the command).
In case the above procedure leads to the definition of a CRASH limit value
which a much lower sensitivity than in the GAP programming, to have a
reliable crash control it may be necessary:
•to program the sensitivity on potentiometer 1 only 10-20% lower than for
gap control.
•disable the crash control in the normal machine conditions that exceed
the crash value.

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4. TROUBLESHOOTING AND MAINTENANCE
4.1 Introduction
With ordinary mainterance we mean all the operations which have to be carried out
periodically and whose execution does not require any specific capability and
therefore they can be carried out by the users (operators, etc.).
With extraordinary maintenance we mean unexpected interventions due to
mechanical or electrical failures requiring an exact technical competence or
particular capabilities and therefore they should be carried out by qualified personnel
only (maintenance personnel, etc.).
4.2 Alarm conditions
When at least one of the following alarm conditions occur, the GAP and/or CRASH
control is supplied at the output:
•Alarm of cable continuity: it is checked whether the microphone connection is
not interrupted (cut of the cable for the connection or disconnection of the
microphone)
•Alarm of microphone efficiency: it is checked both the microphone correct
operation and the correct interfacing between fixed sensor and revolving sensor
(microphone with contactless transmission)
OPERATIONS TO BE CARRIED OUT
Verify the integrity of the connection cable of the microphone and the correct
connection; verify the correct interfacing between fixed sensor and revolving sensor
of the microphone with contactless transmission (cleaning of faced transmission
surfaces).
If the alarm condition remains, ask for the invention of maintenance personnel.

Troubleshooting and Maintenance 15
4.3 Ordinary maintenance
4.3.1 Cleaning of the electronic unit
To clean out the external side of the electronic unit and the front panel use a damp
cloth.
Do not use solvents or abrasive products.
4.3.2 Cleaning of the contactless microphone
In case of microphone/s with contactless transmission (code 3424802000 +
3424802011), carry out the cleaning operations of the transmission faced surfaces
periodically according to the use conditions (for example, with compressed air).
4.4 Extraordinary maintenance
Warning
All special maintenance operations must be carried out by authorized
personnel.
Fine documento / End of Document / Fin du document / Ende des Dokumentes

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Printed in Italy (20/01/06 16.30)