marposs G25 User manual

Installation and user manual
G25 P32
Gear grinding application
Manual Code:D3630000GF

This product conforms with EMC requirements as defined by the directive
2014/30/UE
Applied Standard: EN61326-1
This product has been designed to be operated in industrial environments; the
equipment should be connected to a SELV type 24 Vdc power supply, as defined by
EN60950-1 and NOT to the mains electrical power supply.
Electrical safety
The product has been manufactured in conformity with the Standard EN 61010-1
Manufacturer:
Marposs S.p.A.
Address: Via Saliceto 13, Bentivoglio (BO) Italy
www.marposs.com
Product:
G25 probe with P32 interface
Manual code:
D3630000GF
Date issued:
07.2013
Edition:
11.2016
MARPOSS S.p.A. is not obliged to notify customers of any changes to the product.
The descriptions in this manual shall in no way be interpreted as permission for tampering by
unauthorised personnel.
The warranty covering the equipment shall be void if any evidence of tampering is found.
© Copyright Marposs S.p.A. 2014 -2016

About the Directive “RoHS” regulating the presence of certain hazardous substances in
Marposs electrical and electronic equipment, refer to
http://www.marposs.com/compliance_detail.php/eng/rohs
About possible use in Marposs products of materials coming from conflict areas, refer to:
http://www.marposs.com/compliance_detail.php/eng/conflict_minerals
INFORMATION FOR USERS
concerning the terms of the National Legislation enforcing the Directive 2012/19/EU on
waste electrical and electronic equipment (WEEE).
The wheelie bin symbol with a cross through it on the equipment or its packaging indicates
that the product must be disposed of separately from other waste materials at the end of its
working life.
If the user wishes to dispose of this equipment, he/she must do so in accordance with the
applicable National regulations governing the separation of the unit into its waste materials at
the end of its working life.
Separating waste materials correctly before submitting the equipment for recycling, treatment
and environmentally compatible disposal can help to prevent potentially negative effects on
health and the environment, as well as making it easier to reuse and/or recycle its constituent
materials.
Failure to dispose of this product in accordance with these indications is punishable in
accordance with the applicable laws.

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Contents
1. GENERAL REGULATIONS AND INSTRUCTIONS........................................... 7
1.1 Introduction ................................................................................................. 7
1.2 Testing and Warranty ................................................................................. 7
1.3 General Safety Regulations........................................................................ 7
1.4 Operating Principle ..................................................................................... 8
2. Technical specifications .................................................................................. 9
2.1 G25 Probe Technical Specifications........................................................... 9
2.1.1 Technical Specifications ..................................................................... 9
2.1.2 Overall dimensions ............................................................................. 9
2.2 P32 Interface Technical Specifications..................................................... 10
2.2.1 Technical Specifications ................................................................... 11
2.2.2 Overall dimensions ........................................................................... 12
2.3 Touch and Scanning Speed ..................................................................... 13
2.4 Using the System...................................................................................... 13
3. INSTALLATION................................................................................................ 15
3.1 Mounting the G25 Probe........................................................................... 15
3.1.1 Support for G25 Probe...................................................................... 15
3.2 Mounting the Stylus .................................................................................. 16
3.3 Extensions ................................................................................................ 17
3.4 Electrical Connections .............................................................................. 18
3.4.1 Inhibit Function ................................................................................. 19
3.4.2 Analogue output connection ............................................................. 20
3.5 Operating Cycle Charts ............................................................................ 22
3.6 Output Signals .......................................................................................... 23
4. MAINTENANCE ............................................................................................... 25
4.1 Routine and Extraordinary Maintenance................................................... 25
4.2 Routine Maintenance................................................................................ 25
4.2.1 Cleaning and checks ........................................................................ 25
4.2.2 Substituting the outer seal ................................................................ 26
4.3 Fault finding .............................................................................................. 27

6 Touch and Probing

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1. GENERAL REGULATIONS AND INSTRUCTIONS
1.1 Introduction
This instruction manual provides all specific information necessary for familiarising
yourself with and correctly using your MARPOSS equipment.
The descriptions in this manual are intended for the following type of personnel:
- MARPOSS or Customer Personnel who are responsible for installation of the
equipment.
- Customer technical personnel who must operate directly with MARPOSS equipment.
- Customer technical personnel responsible for maintenance of the production line in
which the MARPOSS equipment is installed.
All rights reserved. This manual is only for in-house use by the Customer.
Any other use is prohibited
1.2 Testing and Warranty
Material defects are covered by the warranty with the following limitations:
•Warranty period:
the warranty covers the product and all repairs carried out within the terms
agreed.
•Subject of the warranty:
the warranty applies to the product and its parts marked with the serial number
or other identification number used by MARPOSS.
The above warranty applies unless other agreements are reached between
MARPOSS and the Customer.
1.3 General Safety Regulations
The equipment was built in conformity with EN 61010-1
Caution:
In some cases it is possible that the probe e
rroneously indicates the
probe home position condition. Do not rely exclusively on the probe
signals to stop machine movement.

8 Touch and Probing
1.4 Operating Principle
The G25 + P32 application is a surface touch and scanning system based on
transducer technology.
It can be used in two ways:
•As a touch probe (Figure 1) for part checking and positioning.
•As a rapid surface scanning probe (Figure 2)
Figure 1: Touch function.
Figure 2: Surface scanning.
Probe approach
Output signal
Probe approach
Output signal

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2. TECHNICAL SPECIFICATIONS
2.1 G25 Probe Technical Specifications
2.1.1 Technical Specifications
(Specifications refer to 35 mm stylus)
PROBE TYPE
G25
PROBE AXES
±X, ±Y, ±Z*
Unidirectional repeatability (2σ)
0.4 µm
Triggering force in XY plane
0.9 N
Triggering force in Z direction
5.5 N
Overstroke in XY plane
12°
Overstroke in Z direction
3.9 mm
Ingress Protection Rating
IP67
Operating environment temperature
5 – 60°C
(*) With restrictions
2.1.2 Overall dimensions
Figure 3: G25 probe dimensions

10 Touch and Probing
2.2 P32 Interface Technical Specifications
The equipment allows TOUCH probes equipped with a transducer to be interfaced
with the machine logic and also supplies an analogue output whose voltage is
proportional to the movement of the contact which touches the surface scanned.
On the front of the equipment are the terminal boards for the I/O (D), analogue
output (F), probe input (G), sensitivity adjustment (E) connections and three
LEDs for the following indications:
Green LED (A): when lit indicates that the equipment power is ON.
Yellow LED (B): lit when the head is deflected or in an error condition (linked to
lighting up of the red LED C.).
Red LED (C): lit when there is a probe or connection fault condition, or a probe
output overload (see following pages).
Figure 4: P32 interface
Caution:
Inside the equipment the “0 V” power supply input and the frame earth
are connected. The frame earth must in turn
be connected to the
machine frame.
Therefore, absolutely avoid any machine power
source which is not compatible with this feature.
D
E
A
B
C
F
G

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Caution:
Before proceeding with connections, follow these instructions:
•Make sure that there is no power supplied to th
e P32 device
(green LED A OFF);
•Use insulated tools;
•
If you absolutely have to use metal tools, touch them on a
metal surface connected to the earth system to discharge any
electrostatic charge built up by the operator.
CAUTION!
Handle components sensitive to electrostatic discharges very carefully.
2.2.1 Technical Specifications
TECHNICAL SPECIFICATIONS
•Power supply voltage: 24V DC SELV type, as define in the EN 60950-
1 norm
(from 18 to 30 V with negative connected to the frame).
•Current draw: max.
100 mA
INPUT SPECIFICATIONS
•Input for touch probe with transducer.
•Input for INHIBIT signal (non-polarized optically isolated) max. 15-30V 10mA.
OUTPUT SPECIFICATIONS
•PROBE OUTPUT: non-
polarized solid state relay max. 50V, max. 40mA, closing
resistance max. 45 Ω, with electronic overcurrent protection.
•LED: 10 mA.
•
ANALOGUE OUTPUT: 60 mV/µm (in Z) for controlling differential or unbalanced
inputs. Output impedance 600
Ω
.
INGRESS PROTECTION RATING: (according to IEC 60529) IP20.
CONTROLS ON PANEL: multi-
turn trimmers with screw control for precision
adjustment of analogue output sensitivity in a range of ±20%.
INTERNAL PROGRAMMING POINTS (see Figure 12 sec. 3.4).
•Jumpers for probe input Normally C
losed (default) or Normally Open
programming.
•Jumper for programming the debounce time to 20 ms or to 50 ms (default).
ENVIRONMENT OPERATING CONDITION
•Environment temperature 5 – 55°C

12 Touch and Probing
[
Note:
After any variation in the touch signal the debounce circuit
keeps the
value fixed for a certain period (which can be set to 50 or 20 ms) to avoid
multiple switches.
2.2.2 Overall dimensions
Figure 5: P32 interface overall dimensions.

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2.3 Touch and Scanning Speed
The calibration speed and the touch speed must match: this allows adjustment of the
measurements with the same systematic error K1 calculated during the calibration
procedure.
For best performance, limit the touch and scanning speed to 1500 mm/min.
2.4 Using the System
•The gauging system is multi-directional in the x/y/+z: axes; the Z axis is
subject to certain restrictions, therefore it is important to make sure you select
the appropriate stylus (stylus mounted on L-shape adaptor. Contact your local
Marposs dealer for more information.
•The stylus touch on the surface of the part to be inspected generates a signal
used by the machine tool to save the point of contact and to stop the machine
axes (part positioning).
•Contact between the stylus and the surface of the part to be inspected
generates a signal used by the electronics to display the profile of the surface
inspected (profile scanning). To optimise probe performance, use a constant
gauging speed.
•The gauging speed selected must allow the machine axis to stop within the
overstroke limits of the probe used.
•To guarantee optimum probe performance, perform calibration in the touch
directions actually used. To calibrate the system, gauge points in the machine
which have a known value (R) and calculate the differences between these and
the values gauged (R+K1). Said difference (K1) must be saved in the CNC and
retrieved each time gauging is performed in the same direction.

14 Touch and Probing

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3. INSTALLATION
3.1 Mounting the G25 Probe
The G25 probe can be mounted on the machine tool using a support to which it is
screwed with the wrench supplied.
•The unit is fixed to the machine using two screws (V).
Figure 6: G25 Probe and supports mounting diagram.
3.1.1 Support for G25 Probe
Figure 7: Support for G25 Probe.
V
2915335490

16 Touch and Probing
3.2 Mounting the Stylus
The rules used for selecting the stylus are even more important for probes with null
pre-stroke. For the G25 we suggest the use of ceramic styli.
Advantages
Disadvantages
Ceramic
•Very rigid material
•Guarantees electrical isolation
- Not usable with very thin styli
Steel /
Tungsten carbide
•Styli with smaller diameters - High elastic coefficient
- Needs crash protection pin
Figure 8: Mounting the Stylus.
Screw the Stylus (A) into the special thread (B) on the G25 probe.
Caution:
For correct stylus tightening, use the pair of wrenches supplied.
Improved precision
A
B

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3.3 Extensions
The extension is an optional accessory for use in deep gauging.
•Check that the O-rings (B-D) are in perfect condition.
•Screw the probe (A) onto the extension (C) using the wrench supplied with a 10
Nm tightening torque.
•Screw the probe extension onto the selected support (E).
Figure 9: Extensions.
A
B
D
C
E

18 Touch and Probing
3.4 Electrical Connections
Figure 10: “Normally closed” configuration
Figure 11: “Normally open” configuration
INHIBIT input
INHIBIT input
Normally open PROBE output
Normally closed PROBE output
Remote LED (if
present)
Remote
LED (if
present)
Power supply
voltage
Power supply
voltage
I/O CONNECTOR
I/O CONNECTOR
Numeric control
Numeric control
Disable
Disable
P32
P32

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Figure 12: Programming points.
Caution:
Ensure the following conditions have been satisfied before selecting
the output polarities or debounce time:
•
Make sure that the P32 is disconnected from its power supply
(Green LED (A) off Figure 4 ).
•Use non conductive tools.
If you cannot avoid using metal tools, we recommend that they be
electrically connected to a metallic surface which is, in turn, connected
to the earthing system in order to discharge any electrostatic charges
accumulated by the operator.
3.4.1 Inhibit Function
When the INHIBIT input is activated (pins 1 and 2 of the I/O connector), the PROBE
and ERROR indicators are kept OFF and the status of the PROBE output
corresponds to the head not deflected situation (irrespective of the status of the head
and the related wiring), unless you activated the PROBE output electronic protection,
which in that case will be open. The INHIBIT function can advantageously be used,
for example, if you need to substitute the probe with the interface switched on,
without it sending false signals to the machine logic.
CONNECTOR FOR
VOLTMETER
DEBOUNCE
TIME
PROBE OUTPUT
POLARITY
N.O.
N.C.

20 Touch and Probing
3.4.2 Analogue output connection
The analogue output of the P32 interface allows connection both of user devices with
differential input, and of user devices with unbalanced input.
3.4.2.1 User devices with differential input
For maximum immunity against interference it is a good idea to use a differential
connection, whose correct set-up is shown in Figure 13. In theory the optimum
situation is when in the user device the analogue earth is internally connected to its
frame earth, because this minimises common-mode interference at the ends of its
input differential amplifier.
3.4.2.2 User devices with unbalanced input
If, instead, the user device has an unbalanced input, the connection to be made is shown
in Figure 14. Again in this case care must be taken, since the analogue earths of the P32
and the user device must be connected; because, as already indicated, the analogue earth
of the P32 is internally connected to its frame, which is in turn connected to the machine
frame, it is essential to avoid connection with user devices that are incompatible with these
features, that is to say, with an analogue earth connected to a potential which is different
from that of the machine frame or which require isolation between the analogue earth and
the frame. Similarly to the above, a compatibility check is easily run by connecting a
multimeter between the analogue earth of the user device input and the machine frame: if
the light comes on, or if there are error or other fault indications, the connection is
absolutely not possible. With the unbalanced type of connection, given the lower immunity
to interference, you must also reduce as much as possible the length of the connecting
cable for the analogue signal between the P32 and the user device, and make the P32 and
user device connections to the machine frame at points which are as close as possible
(coinciding if possible). In fact, although a cable with good shielding can protect against
capacitive interference, its effectiveness is very limited against electromagnetic
interference on “earth coils” or due to “common impedance coupling”.