Renishaw PI 7-2 User manual

Installation guide
H-1000-5015-13-C
PI 7-2

© 2002 - 2009 Renishaw plc. All rights reserved.
This document may not be copied or reproduced in whole or in part, or
transferred to any other media or language, by any means, without the
prior written permission of Renishaw.
The publication of material within this document does not imply
freedom from the patent rights of Renishaw plc.
Disclaimer
RENISHAW HAS MADE CONSIDERABLE EFFORTS TO ENSURE
THE CONTENT OF THIS DOCUMENT IS CORRECT AT THE
DATE OF PUBLICATION BUT MAKES NO WARRANTIES OR
REPRESENTATIONS REGARDING THE CONTENT. RENISHAW
EXCLUDES LIABILITY, HOWSOEVER ARISING, FOR ANY
INACCURACIES IN THIS DOCUMENT.
Trademarks
RENISHAW® and the probe emblem used in the RENISHAW logo are
registered trademarks of Renishaw plc in the UK and other countries.
apply innovation is a trademark of Renishaw plc.
All brand names and product names used in this document are trade
names, service marks, trademarks, or registered trademarks of their
respective owners.
Renishaw part no: H-1000-5015-13-C
Issued: 01 2009

1
PI 7-2
interface for TP7M probe series
installation guide

2
FCC (U.S.A)
Information to user (FCC Section 15.105)
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated
in a commercial environment. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the installation
manual, may cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in which case
you will be required to correct the interference at your own expense.
Information to user (FCC Section 15.21)
The user is cautioned that any changes or modifications not expressly approved by
Renishaw plc or authorised representative could void the user’s authority to operate the
equipment.
Special accessories (FCC Section 15.27)
The user is also cautioned that any peripheral device installed with this equipment
such as a computer, must be connected via a high-quality shielded cable to insure
compliance with FCC limits.
TÜV
This equipment has been independently certified by TÜV Product Services in
accordance with OSHA (US) and SCC (Canada) requirements to the standards
UL61010-1 Second Edition and CAN/CSA-C22-2 No. 61010-1 Second Edition.

3
Safety
If this product is not used in its intended manner, any protection provided may be
impaired.
There are no user serviceable parts inside this equipment.
The PI 7-2 interface unit must be connected to a supply incorporating a protective earth
conductor via a three-core mains cable (line cord).
Electrical ratings
Supply voltage range 100-240 V ac +10%, -15%
Power frequency range 47 Hz - 66 Hz
Power consumption 10 W
SSR contact ratings ±40 mA pk
±50 V pk
Operating conditions
The PI 7-2 interface unit is specified to operate under the following conditions as
defined in BS EN 61010-1:2001.
Protection provided by enclosure IP30
Altitude Maximum 2000 m
Operating temperature 0 °C to +50 °C
Storage temperature -10 °C to +70 °C
Relative humidity Maximum 80 % RH up to +31 °C,
decreasing linearly to a maximum 50%
at +40 °C
Transient voltages Installation category II
Pollution degree 2
The PI 7-2 is isolated from AC power by disconnection of the IEC mains connector on
the rear panel. If any additional means of isolation is required, it must be specified and
fitted by the machine manufacturer or the installer of the product. The isolator must
be sited within easy reach of the CMM operator and comply with IEC61010 and any
applicable national wiring regulations for the country of installation.
Safety

4
Care of equipment
Renishaw probes and associated systems are precision tools used for obtaining precise
measurements and must therefore be treated with care.
Changes to Renishaw products
Renishaw plc reserves the right to improve, change or modify its hardware or software
without incurring any obligations to make changes to Renishaw equipment previously
sold.
Warranty
Renishaw plc warrants its equipment provided that it is installed exactly as defined in
associated Renishaw documentation.
Consent must be obtained from Renishaw if non-Renishaw equipment (e.g. interfaces
and/or cabling) is used or substituted. Failure to comply with this will invalidate the
Renishaw warranty.
Claims under warranty must be made from authorised services centres only, which may
be advised by the supplier or distributor.
Patents
Features of Renishaw’s PI 7-2 and associated products are the subjects of the following
patents and patent applications:
EP 0243766 JP 2,545,082 US 4813151
EP 0388993 JP 2,647,881 US 4916339
EP 279828 B JP 3,346,593 US 5,228,352
EP 0521703
Care of equipment

5
Contents
Contents
1 Introduction ................................................................................................................6
2 Product description ....................................................................................................7
2.1 Technical description ......................................................................................7
2.2 Front panel indicators .....................................................................................8
2.3 Reset switch ...................................................................................................9
2.4 Configuration switches....................................................................................9
2.5 Connector pins .............................................................................................13
2.6 Summary of changes from earlier versions of PI 7.......................................14
2.7 Dimensions...................................................................................................14
3 Replacement of PI 7, PI 7c and PI 7H .....................................................................15
4 Installation procedure ..............................................................................................16
4.1 Rack mounting..............................................................................................16
4.2 System interconnection ................................................................................18
5 Maintenance ............................................................................................................20

6
1 Introduction
The PI 7-2 is a dedicated signal conditioner for interfacing the TP7M series of probes or
touch-trigger probe types such as TP2, TP20 or TP6/TP6A, to the CMM controller.
Introduction

7
2 Product description
2.1 Technical description
The PI 7-2 automatically recognises the probe type, determines the probe status, which
is either triggered or seated (armed), and transmits debounced signals to the CMM
controller. Status and control signals are transferred between the PI 7-2 interface, other
Renishaw equipment and the CMM controller via the product interconnection system
(PICS) ports.
The TP7M probe series employ silicon strain sensors to detect the small gauging forces
applied to the stylus tip. There is no electronic processing in the probe and the sensors
are connected directly to the interface via the Renishaw autojoint connector, the probe
head and associated wiring. The sensor signals are amplified and the resultant ‘probe
signals’, proportional to changes of strain, are compared with reference voltages to
determine the status of the probe.
The initial value of strain in the sensor structure will vary with the mass of the stylus and
the orientation of the probe. At switch-on or following re-orientation of the probe on a
movable head, a process known as ‘autozero’ is used to rapidly null the strain to a zero
reference level.
When the stylus contacts the workpiece, a change of strain occurs in the probe
structure causing the probe signal voltage to exceed the trigger reference level. A
probe trigger signal condition occurs by asserting SYNC on the PICS port. As stylus
deflection increases, the probe signal voltage will exceed the halt reference level and
HALT will be asserted on the PICS port. When the stylus backs-off the workpiece, the
probe signal falls below the reference levels; SYNC and HALT are cleared to the seated
state and the sensor outputs are nulled to the zero reference level in preparation for
the next trigger. Debounce timers allow the motion characteristics to stabilise after the
initial trigger and reseat events, to prevent spurious switching.
A solid state relay (SSR) equivalent of the SYNC output is provided for controllers
requiring a voltage free contact at their probe input.
There is a choice of 2 levels of trigger sensitivity to allow the TP7M series to be used on
a wide range of CMM types or in situations where the ambient vibration levels are not
ideal.
Product description

8
Product description
2.2 Front panel indicators
Figure 1 - PI 7-2 interface front panel
Front panel indicators
Indicator Colour Function
POWER ON Green Mains power on
TYPE STD Green Touch-trigger probe selected
TP7 Green TP7M series probe selected
PROBE
SEATED Green
ON - probe (seated)
OFF - probe triggered or no probe connected
DAMPED Yellow PDAMP asserted

9
Product description
2.3 Reset switch
Automatically, the probe will reset to the armed state when the PI 7-2 is powered
up. Occasionally, it may be necessary to perform a manual reset, for example after
changing the probe stylus.
Press the RESET button on the front panel for 2 seconds to reset the probe to the
armed (seated) state.
CAUTION: Pressing the RESET button inhibits probe triggers. Before pressing
the button, the CMM must be stationary, in manual mode, with the stylus clear
of the workpiece.
NOTE: The action of unlocking and locking the PH10 series motorised head will
perform the same function as the RESET button.
2.4 Configuration switches
Configuration switches
!
Figure 2 - PI 7-2 interface back panel
Version
label
Serial number label

10
Product description
Configuration switches
Switch
no. Function Position Description
1 SSR invert UP
DOWN
SSR closed when probe seated
SSR open when probe seated
2 Buzzer UP
DOWN
Audible indication of probe trigger - OFF
Audible indication of probe trigger - ON
3Kinematic probe
input
UP
DOWN
Autojoint input only
PICS input enabled
4 Probe type UP
DOWN
Optimise for issue ‘01’ (or later) probe
All probe types
5 STOP disable UP
DOWN
No response to PICS - STOP
Trigger outputs respond to PICS - STOP
6 HALT invert UP
DOWN
PICS - HALT output active HIGH
PICS - HALT output active LOW
7 HALT mode UP
DOWN
HALT generated internally
HALT asserted by PICS
8 Auto reset DOWN
UP
Automatic reset disabled
Probe will reset after 2 seconds
9Trigger
sensitivity
DOWN
UP
Level 1 (high sensitivity)
Level 2 (mid sensitivity)
10 No function - unused
Switch 1
The solid state relay (SSR) output contacts may be set to be open when the probe is
seated and closed when the probe is triggered. The output may be inverted to mimic
the action of a kinematic probe.
Switch 2
The internal audible indicator normally gives a short tone burst when the SYNC output
changes from the seated to the triggered state. The switch may be set to enable or
disable the sound.

11
Product description
Switch 3
With switch 3 UP, the PI 7-2 will automatically change operating modes from TP7M to
kinematic probe types (TP2, TP20 or TP6/TP6A) when a TP6A probe or PAA series
adapter is attached to the Renishaw autojoint connector on the probe head. Switch 3
should be set to the DOWN position only when it is necessary to connect a kinematic
probe or an electronic trigger, from an external source, to the PICS input connector.
For example, this will be necessary if the TP7 is fully integrated with the TP200 probe
on the same installation.
Switch 4
Early versions of the TP7M probe required faster resetting than the ‘01’ (or later) issue
(after January 1995). Where only the ‘01’ or later versions are to be used, switch 4
should be set to the UP position to optimise the reset function. This will reduce the
possibility of an incorrectly seated probe occurring in situations where the back-off from
the gauge point is slow or where the stylus ‘skates’ on the surface. Switch 4 should
be set to the DOWN position where the ‘pre-01’ probe or mixed types are used. The
DOWN position provides equivalent function to previous versions of the PI 7.
The TP7M probe types may be recognised by the differences in appearance shown in
figure 3.

15 mm 13 mm 13 mm
Mechanically
engraved
Laser
engraved
Pre-01 probe
Diaphragm
recessed
Issue 01 probe Enhanced
performance
probe
Figure 3
The TP7M probe indicating spacing of stainless steel sleeve and recessed diaphragm
on ‘01’ probe and the enhanced performance probe

12
Product description
Switch 5
With switch 5 DOWN, the SYNC, HALT and SSR outputs will go to the triggered state
when the CMM controller or other Renishaw equipment asserts the PICS STOP line.
Setting switch 5 UP disables the response.
Switch 6
The HALT output at the PICS connector is active low with switch 6 DOWN but may be
inverted by selecting switch 6 UP.
Switch 7
Set switch 7 to the UP position for normal operation with the TP7M or kinematic probes
(TP2, TP20 or TP6/TP6A). For fully integrated operation of the TP7M with the TP200
probe on the same installation, set switch 7 to the DOWN position to allow the HALT
signals from the PI 200 interface to be automatically routed to the CMM controller when
the probe is changed.
Switch 8
Set switch 8 DOWN for normal operation with the automatic reset disabled. Set switch
8 UP to select automatic reseat of the probe 2 seconds after triggering. This facility is
included for compatibility with previous versions of the PI 7.
Switch 9
Set switch 9 DOWN for normal operation with the TP7M at its highest sensitivity
(level 1) and lowest error.
Under certain conditions, vibration may cause false ‘air’ triggers during gauging and
it may be necessary to reduce the probe’s sensitivity. False triggers may occur when
large or heavy stylus arrangements are used, or where there is floor transmission
from nearby machinery or vehicles. Set switch 9 UP to select level 2. This will reduce
sensitivity to vibration but with a small loss of measuring accuracy.
NOTE: All configuration switches are hardware controlled and do not require the PI 7-2
to be switched off and on again to make the selection active.

13
Connector pins
2.5 Connector pins
Refer to the Renishaw installation guide ‘Product interconnection system – PICS’ (part
number H-1000-5000) for the electrical specification of the PICS signals.
PICS output connector
The PICS output connector is a 9 pin ‘D’ type plug. The pin numbers (viewed on the
rear panel) are shown in the table below.
PICS output connector pin numbers
Pin no. Function Pin no. Function
1 STOP 6 HALT
2 PPOFF 7 PDAMP
3 0 V 8 LEDOFF
4 Reserved for Renishaw use 9 Not used
5 SYNC (probe trigger) Shell Screen
PICS input connector
The PICS input connector is a 9 pin ‘D’ type socket. The pin numbers (viewed on the
rear panel) are shown in the table below.
PICS input connector pin numbers
Pin no. Function Pin no. Function
1 STOP 6 HALT IN
2 PPOFF 7 PDAMP
3 0 V 8 LEDOFF
4 Reserved for Renishaw use 9 Probe return (0 V)
5 Probe input Shell Screen

14
Connector pins
Solid state relay (SSR) connector
The SSR output connector is a 7 pin DIN socket. The pin numbers (viewed on the rear
panel) are shown in the table below.
SSR connector
Pin no. Function Pin no. Function
1 0 V 5 Probe status 2
2 Not used 6 Not used
3 Not used 7 Not used
4 Probe status 1 Shell Screen
2.6 Summary of changes from earlier versions of PI 7
• New enclosure
• Universal mains voltages
• Broken gauge detection added
• Auto reset selections reduced to either 2 s or OFF
• Audible warning (buzzer) volume control removed
• Audible warning (buzzer) OFF switch added
• RESET button on front panel added
• PICS HALT o/p invert switch added
• PICS SSR o/p invert switch added
• Optimisation available for ‘01’ type probes
2.7 Dimensions
Enclosure style
Overall dimensions
Mounting method
Weight
1/3 rack (19 “) x 2U
140 mm x 88 mm x 183 deep
Rack mounting or free standing
1.6 kg

15
Replacement of PI 7, PI 7c and PI 7H
3 Replacement of PI 7, PI 7c and PI 7H
The following table relates the PI 7-2 configuration switches to the previous standard
and custom versions of the PI 7.
Function PI 7-2 * PI 7-2 #PI 7 PI 7c PI 7H
SSR invert Sw1
UP
DOWN
Sw1
UP
DOWN
Sw2
UP
DOWN
Sw2
UP
DOWN
Sw2
UP
DOWN
Buzzer off Sw2 Sw2 ‘VOL’ on rear
panel
‘VOL’ on rear
panel
‘VOL’ on rear
panel
Kinematic
probe input
Sw3
UP
DOWN
Sw3
UP
DOWN
Sw6
DOWN
UP
Sw6
DOWN
UP
Sw6
DOWN
UP
Probe type Sw4 Sw4 No function No function No function
STOP
disable
Sw5
UP
DOWN
Sw5
UP
DOWN
Internal
Sw3 on
motherboard
UP
DOWN
Internal
Sw3 on
motherboard
UP
DOWN
Internal
Sw3 on
motherboard
UP
DOWN
HALT invert Sw6
UP
DOWN
Sw6
UP
DOWN
No function Internal Sw1
on LED board
RIGHT
LEFT
Internal Sw1
on LED board
RIGHT
LEFT
HALT mode Sw7
UP
DOWN
Sw7
UP
DOWN
No function No function Internal Sw2
on LED board
LEFT
RIGHT
Auto reset Sw8
DOWN
Sw8
RIGHT
Sw4/5
Sw4 DOWN
Sw5 DOWN
Sw4/5
Sw4 DOWN
Sw5 DOWN
Sw4/5
Sw4 DOWN
Sw5 DOWN
Sw8
UP
Sw8
LEFT
Sw4 UP
Sw5 DOWN
Sw4 UP
Sw5 DOWN
Sw4 UP
Sw5 DOWN
Trigger
sensitivity
Sw9 Sw9 Sw3 Sw3 Sw3
Level 1 DOWN RIGHT DOWN DOWN DOWN
Level 2 UP LEFT UP UP UP
Grounding Function
deleted
Function
deleted
Sw1 Sw1 Sw1
* Version 13 and above. # Version 12 and below.

16
Installation procedure
4 Installation procedure
WARNING: Ensure the PI 7-2 is disconnected from the mains supply during
installation.
WARNING: Do not exceed the operation ambient of 50 °C around the unit.
Do not install near sources of heat. Forced cooling may be required in final
installation.
4.1 Rack mounting
The PI 7-2 may be mounted in a 19 “ equipment rack or may be free standing.
To mount the PI 7-2 alone requires 2 x 1/3 blanking panel kits (part number
A-1018-0123). Refer to figure 4 below.
Figure 4 - Mounting the PI 7-2
To mount the PI 7-2 adjacent to a Renishaw PHC10-2 head controller or ACC2-2
autochange controller requires a rack mounting bracket (part number A-1018-0124) and
an enclosure link bracket kit (part number A-1018-0126).
Remove the blanking plugs from the side of each unit and fit the halves of the link
bracket before screwing them together, as shown in figure 5, with the screws provided.
!
!

17
Installation procedure
To mount the PI 7-2 into an existing installation adjacent to a PHC10 or ACC2 (previous
style of enclosure with extruded side pieces), a link bracket (part number M-1018-0097)
and 2 x M5 screws x 6 mm long (part number P-SC29-0506) are required.
Remove the blanking plugs from the side of the PI 7-2 and screw the bracket in place.
On the extruded style enclosure, prise out the rubber cover from the corner moulding
and loosen the 2 screws. Locate the bracket between the corner moulding and the
front panel, tighten the screws and replace the cover.
Rack mounting
bracket
A-1018-0124
Link bracket kit
A-1018-0126
Figure 5 - Mounting the PI 7-2 adjacent to a Renishaw PHC10-2

18
Installation procedure
Communications to
CMM controller
PHC10-2
Cable 1
Cable 2
Cable 4
Cable 3
PI 7-2
PH10M
SSR
output
PICS
output
Figure 6 - System interconnection
4.2 System interconnection
The interconnections for the TP7 system on a PH10M motorised probe head are shown
in figure 9. The table opposite gives a list of alternative standard Renishaw cable
lengths and part numbers.
Refer to the Renishaw ‘PH10M system’ installation guide (part number H-1000-5071),
for further information