Installation guide M A. RGH20 RESR angle encoder system

Transcription

1 Installation guide M A RGH20 RESR angle encoder system

2 Contents Product compliance 1 Storage and handling 2 RESR installation drawing ( A section) RESR installation drawing ( B section) 4 RGH20 installation drawing Select a mounting option Taper mount method Interference fit method 7 RGH20 reference mark options 8 SECTION 2 - RGH20F/REF system Calibration 1 LED indicators 1 General specifications 14 Output signals 14 REF installation drawing 1 Electrical connections 1 Speed 1 Output specifications 17 RGH20 direct output quick-start guide 8 RGH20F/REF quick-start guide 8 Readhead mounting and alignment 9 SECTION 1 - RGH20 direct output readheads General specifications Output signals Electrical connections 11 Speed 11 Output specifications

3 Product compliance C Renishaw plc declares that RGH20 and REF comply with the applicable standards and regulations. A copy of the EC Declaration of Conformity is available on request. FCC compliance This device complies with part 1 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 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. This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 1 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 instruction 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 the user will be required to correct the interference at his own expense. NOTE: This unit was tested with shielded cables on the peripheral devices. Shielded cables must be used with the unit to ensure compliance. RoHS compliance Compliant with EC directive 2011//EU (RoHS) 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. The packaging of our products contains the following materials and can be recycled. Packaging Component Material ISO 1149 Recycling Guidance Outer box Inserts Bags Cardboard Polypropylene Low Density Polyethylene Foam Cardboard High Density Polyethylene Bag Metalised Polyethylene t applicable PP LDPE t applicable HDPE PE Recyclable Recyclable Recyclable Recyclable Recyclable Recyclable Patents Features of Renishaw s encoder systems and similar products are the subjects of the following patents and patent applications: EP8218 JP7819 US01971 US48111 IL1899 JP EP9402 CN998 GB JP4818 US7729 CN11411 EP14999 JP0029 US8987 US8494 JP44219 US778 EP12248 Further information Further information relating to the RGH20 encoder range can be found in the RGH20 system Data sheet. This can be downloaded from our website and is also available from your local representative. This document may not be copied or reproduced in whole or in part, transferred to any other media or language, by any means without the written prior permission of Renishaw. The publication of material within this document does not imply freedom from the patent rights of Renishaw plc. The use of this symbol on Renishaw products and/or accompanying documentation indicates that the product should not be mixed with general household waste upon disposal. It is the responsibility of the end user to dispose of this product at a designated collection point for waste electrical and electronic equipment (WEEE) to enable reuse or recycling. Correct disposal of this product will help to save valuable resources and prevent potential negative effects on the environment. For more information, please contact your local waste disposal service or Renishaw distributor. 1

4 Storage and handling Readhead Ring UHV version only Ring and readhead Ring only Readhead only N-heptane Acetone Acetone CH (CH 2 ) CH CH COCH Chlorinated Solvents CH COCH Chlorinated Solvents Propan-2-ol CH CHOHCH Methylated Spirits Methylated Spirits System Storage Operating Humidity +70 C -20 C + C 0 C 9% relative humidity (non-condensing) to EN

5 RESR installation drawing ( A section) Dimensions and tolerances in mm N holes equally spaced on PCD ØDH Ø. through c/bore top face Ø x deep N holes equally spaced on PCD ØDH M x 0. through c/bore top face Ø. x 4 deep ØDI ØDH ØDO A A NOTE: θ is the angle between one tapped hole and the adjacent clearance hole. The angle between two clearance holes is 2θ. θ Section AA 0. x 4 Scale 2 1 ±0.2 1 x 4 minal external diameter * 0 Line count 20 µm pitch DO *NOTE: There are no tapped holes on the 489 mm ring. DI Mounting holes DH N θ

6 RESR installation drawing ( B section) Dimensions and tolerances in mm N holes equally spaced on PCD ØDH Ø. through minal external diameter 7 Line count 20 µm pitch DO DI Mounting holes DH 1 N θ 0 N holes equally spaced on PCD ØDH M x 0. through A A Section AA θ 2. x 4 Scale. R0. ØDI ØDH ØDO NOTE: θ is the angle between one tapped hole and the adjacent clearance hole. The angle between two clearance holes is 2θ. 4

7 RGH20 installation drawing (RESR A section ring shown) Dimensions and tolerances in mm Limit switch installation 11. (Yaw tol. ±0. ) A * Set-up LED (except RGH20F) *Mount limit switch actuator with dimple facing readhead 4 min 1. (for RGH20 variants D, X, Z, W, Y, H, I, O and B) 11. (for RGH20 variant F) 1..7 R>20 dynamic bend radius R> static bend radius = -0.1 ( +0.2) Ø4.2 ± mounting holes M x 0. through.8 (Pitch tol. ±1 ) 0. A 7.8 (Roll tol. ±1 ) 0.09 Ring and readhead optical centreline A Reference mark sensor/limit switch sensor position Ring and readhead optical centreline 4.8 Rideheight 0.8 ±0.08 Forward direction of ring (increasing count) A Datum A passes through RESR centre of rotation = Required nominal 0.8 gap can be set using blue readhead spacer (supplied) positioned between readhead and actuator when positioning/fixing the actuator.

8 Select a mounting option Taper mount Interference fit Taper mount method Step 2 u Clean shaft taper and internal taper of RESR as recommended in the storage and handling section. A section B section tes t applicable Recommended for all installations Enables simplest adjustment. Offers highest accuracy. Enables eccentricity to be compensated. Offers excellent mechanical stability against thermal cycling, shock and vibration. Minimises cost of substrate preparation. Alternative installation Will not correct eccentricity of the supporting shaft. u Insert the first screws: For RESR rings with, 9 or 18 mounting holes, use equally spaced M screws. For RESR rings with, 1 or 20 mounting holes, use 4 equally spaced M screws. NOTE: Do not lubricate screws. Recommended screw type M x 0.: ISO 472/DIN 9 grade.9 minimum/ansi B18..1M. u Insert the screws so that the RESR is loosely connected to the shaft, then roughly align the ring by eye and touch. u Lightly tighten the screws. Use a Dial Test Indicator (DTI) to check the radial displacement at the screw locations. NOTE: Disregard the radial displacement between the screw locations. Taper mount method Step 1 DTI Mounting shaft specifications 1* 7 min DT 1 ±0.2 Use a DTI with low exertion force to avoid scratching the scale surface. A DTI with a ruby ball stylus is recommended as a further precaution against scratches. Recommended taper roundness Diameter to 2 00 Roundness value (mm TIR) Recommended surface finish Ra 1.2 NOTE: It is recommended that the mounting surface is a turned, rather than ground finish. *Allow 2 mm for 417 mm, 489 mm and 0 mm rings only Recommended taper diameter (DT) DO DT DO DT DO DT DO = minal external diameter u Adjust the screws to reduce the range of radial displacement. When adjusting, identify the screw location with the lowest radial displacement and tighten that screw, aiming for the average of the highest and lowest indicator readings. u Repeat this process until the DTI readings are within ± µm at the screw locations. NOTE: It may be necessary to loosen screws whilst tightening other screws. NOTE: At this stage, the screws should only be lightly tightened (less than 0. Nm) to allow further final adjustment.

9 Select a mounting option (continued) Taper mount method Step Taper mount method Step Taper mount method Step 4 u Insert the next screws: For RESR rings with, 9 or mounting holes, insert all the remaining M screws. For RESR rings with 1 mounting holes, insert equally spaced M screws. For RESR rings with 18 mounting holes, insert equally spaced M screws. For RESR rings with 20 mounting holes, insert 8 equally spaced M screws (in four groups of two) between existing screws. u As described in Step 2, adjust all the screws inserted thus far, so that the radial displacement at each screw location is within ± µm. u Again, at this stage, the screws should only be lightly tightened (less than 0. Nm). NOTE: You may notice that the torque required to achieve the radial displacement tolerance will be slightly higher during step than during step 2. This is normal. u Insert screws into the remaining mounting holes. Diameter to 2 00 to Recommended torque range (Nm) Interference fit method DO Mounting shaft specifications. DS u Rotate the RESR ring, measuring the radial displacement at all of the screw locations. u Tighten the screw with the lowest radial displacement so that it matches the average radial displacement, whilst ensuring the maximum torque specified in the table is not exceded. u Again, rotate the RESR ring and re-check the radial displacement at all of the screw locations, tightening the screw with the lowest radial displacement so that it matches the average. u Repeat this process until the radial displacement at all of the screw locations is within ± µm and that all screw torques are within the specified range. u Excessive tightening of screws can have a small effect on accuracy. Please contact your local representative for more details. NOTE: 417, 489 and 0 mm rings should be taper mounted only. DO = minal external diameter DS = Recommended shaft diameter to enable interference fit DO DS

10 RGH20 reference mark options Dimensions and tolerances in mm 1. Using A Using A This section is a quick-start guide to installing RGH20 and RGH20F/REF systems. More detailed information on installing the system is contained in the following sections of the installation guide. RGH20 direct output quick-start guide Ensure scale, readhead optical window and mounting faces are clean and free from obstruction Connect readhead to receiving electronics and power-up A Ring centreline and readhead optical centreline minal ring diameter +21. max Ring centreline and readhead optical centreline 14 A Install and align the readhead to maximise the signal strength over the full axis of travel as indicated by the LED on the readhead (green) Move the readhead slowly (<0mm/s) past the reference mark in the direction used for the datuming operation If fitted, ensure correct reference mark magnet is fitted and positioned minal ring diameter -18 min M x 0. x long into any existing tapped hole 0. 7 Use A adhesive to affix reference mark actuator Adjust the phasing of the reference mark to give a red flash on the readhead LED as the readhead passes the reference mark The system is now ready for use RGH20F/REF quick-start guide INSTALLATION Ensure scale, readhead optical window and mounting faces are clean and free from obstruction If fitted, ensure correct reference mark magnet is fitted and positioned. Using A Using A Plug the readhead cable into the REF interface. Connect the interface to the receiving electronics and power-up 22.1 A Ensure AGC is switched off the CAL/AGC LED on the interface should be off (if not press and hold the CALIBRATE button on the interface for > seconds) Install and align the readhead to maximise the signal strength over the full axis of travel as indicated by the interface LED (SETUP LED green, ideally blue or purple) Ring centreline and readhead optical centreline Move the readhead slowly (<0mm/s) past the reference mark in the direction used for the datuming operation Ring centreline and readhead optical centreline Adjust the phasing of the reference mark to give a red flash on the SETUP LED on the interface as the readhead passes the reference mark A CALIBRATION Press and release the CALIBRATE button on the interface M The CAL/AGC LED will flash slowly M screw, button head Move the readhead slowly along the scale (<0 mm/s) until the CAL/AGC LED stops flashing The system is now calibrated and ready for use AGC can now be switched on if required by pressing and holding the CALIBRATE button for > seconds. The CAL/AGC LED will be on 8

11 Readhead mounting and alignment Mounting brackets The bracket must have a flat mounting surface, ensure conformance to the installation tolerances, allow adjustment to the rideheight of the readhead, and be sufficiently stiff to prevent deflection or vibration of the readhead during operation. Readhead set-up Ensure that the scale surface, readhead optical window and mounting face are clean and free from obstructions. To set nominal rideheight, place the Blue readhead spacer with the L shaped aperture under the optical centre of the readhead to allow normal LED function during set-up procedure. Adjust the readhead to maximise the signal strength. On RGH20 direct output you should achieve a Green LED on the readhead over the full rotation. For RGH20F/REF systems the SETUP LED on the interface should be at least Green, ideally Blue or Purple over the full rotation. NOTE: When using REF system ensure that Automatic Gain Control (AGC) is switched off. (CAL/AGC LED on the interface is off). NOTE: Ensure readhead fixing screws are tightened to 0. Nm to 0.7 Nm. Pitch 0 ±1 Yaw 0 ±0. Roll 0 ±1 Rideheight 0.8 ±0.08 mm Limit switch A limit switch signal is output when the readhead sensor passes over the magnetic actuator. Reference mark set-up To ensure un-idirectional repeatability, the reference mark requires phasing with the scale in the direction of normal datuming operation. A reference pulse is output in both directions, but repeatability is guaranteed only in the phased direction. Ensure readhead is set up correctly ensuring a Green LED indication over the full rotation and that the reference mark actuator is fitted correctly. NOTE: It is recommended that a datum procedure is performed as part of any power-up sequence to ensure the correct datum position is recorded. Phasing procedure The readhead must be moved over the reference mark in the direction to be used for the datuming operation. The reference mark is phased correctly when the set-up LED on the readhead or interface flashes Red for 0.2 seconds. If it flashes Orange or goes Blank, the reference mark adjuster screw should be turned anti-clockwise by 1 8 turn and the procedure repeated until a Red flash is obtained. RGH20 LED colour, during reference mark traverse only. 1 8 turn RGH20 LED colour, except at reference mark position. Red Orange Blank Green Orange Red RGH20F/REF SETUP LED colour, except at reference mark position. RGH20F/REF SETUP LED colour, during reference mark traverse only. Green Orange Red Blue Purple Red Orange Blank NOTE: Reference mark flashes only occur up to 0 mm/s traverse speed. NOTE: The RGH20F readhead does not have an LED. NOTE: The RGH20F readhead does not have an LED. 9

12 SECTION 1 - RGH20 direct output readheads General specifications Power supply V ±% RGH20D, X and Z <90 ma RGH20W, Y, H, I and O <0 ma RGH20B <1 ma NOTE: Current consumption figures refer to unterminated readheads. For digital outputs a further ma per channel pair (eg A+,A-) will be drawn when terminated with 0R. For analogue outputs a further 20 ma will be drawn when terminated with 0R. Power from a V dc supply complying with the requirements for SELV of standard IEC BS EN Ripple 200 mvpp@ frequency up to 00 khz Sealing IP40 Output signals way D-type plug (termination code D and L) RGH20 D, X, Z, W, Y, H, I and O RS422A digital Function Signal Colour (F) Power V 0 V Brown White Incremental signals + Green A - Yellow way D-type plug (termination code A) Flying lead (termination code F) 9 way D-type (A) 1 way D-type (D) 7, 8 1 2, Acceleration Operating 00 m/s 2, axes Shock n-operating 00 m/s 2, ms, ½ sine, axes B + - Blue Red Vibration Operating 0 m/s 2, Hz to 2000 Hz, axes Reference mark/limit switch Z+/Q- Pink Mass Readhead 11 g Cable 4 g/m Shield Z-/Q+ Inner Grey Inner shield Cable Double-shielded, outside diameter 4.2 ±0.2 mm Flex life >20 x cycles at 20 mm bend radius RGH20 B, 1 Vpp analogue Outer Outer shield Case Case The RGH20 readheads have been designed to the relevant EMC standards but must be correctly integrated to achieve EMC compliance. In particular, attention to shielding and earthing arrangements is essential. Function Power Signal V Colour (F) Brown 9 way D-type (A) 1 way D-type (L) 4, 0 V White 1, 1 Incremental signals + Green 2 9 V 1 - Yellow 1 + Blue 4 V 2 - Red 8 2 Reference mark/limit switch V 0 +/V q - Pink V 0 -/V q + Grey 7 11 Shield Inner Inner shield 9 1 Outer Outer shield Case Case

13 SECTION 1 - RGH20 direct output readheads (continued) Electrical connections RGH20 grounding and shielding RGH20 Inner shield Extension cable* Customer electronics V Speed Digital readheads The tables below show the maximum speed and associated lowest recommended counter input frequency for all digital output readheads. *Maximum extension cable length: Outer shield RGH20B -0 m, RGH20D, X and Z- 0 m RGH20W, Y, H, I and O - 20 m IMPORTANT: The outer shield should be connected to the machine earth (Field Ground). The inner shield should be connected to 0 V. Care should be taken to ensure that the inner and outer shields are insulated from each other. If the inner and outer shields are connected together, this will cause a short between 0 V and earth, which could cause electrical noise issues. Recommended signal termination Digital outputs RGH20D, X, Z, W, Y, H, I and O 0 V Readhead A B Z+ 220 pf Customer electronics 0 V Output signals Head type RGH20D ( µm) RGH20X (1 µm) RGH20Z (0. µm) Maximum speed (m/s) 8 Lowest recommended counter input frequency (MHz) encoder velocity (m/s) resolution (µm) x 4 safety factor The RGH20Y, W, H, I and O readheads are available with a variety of different clocked outputs. Customers must ensure they comply with the lowest recommended counter input frequency. Option code Head type RGH20W (0.2 µm) RGH20Y (0.1 µm) Maximum speed (mm/s) RGH20H (0 nm) ) RGH20I (20 nm) RGH20O ( nm) 4 20 ) Lowest recommended counter input frequency (MHz) 8 4 Cable Z 0 = 0R 0R Analogue readhead (1Vpp) RGH20B 0 A B Z- Analogue output - type RGH20B 220 pf 0 V Standard RS422A line receiver circuitry. Capacitors recommended for improved noise immunity. Contact Renishaw for further details on receiver termination for -state output. Signal amplitude (%) 70 0 Frequency (khz) m/s V q V 0 V 1 V 2 + Angular speed depends on ring diameter, use the following equation to convert to rev/min: 0R Angular speed (rev/min) = V x 00 x 0 p D Where V = maximum linear speed (m/s) and D = external diameter of RESR V q V 0 V 1 V 2-11

14 SECTION 1 - RGH20 direct output readheads (continued) Output specifications Digital output signals - type RGH20D, X, Z, W, Y, H, I and O Form - Square wave differential line driver to EIA RS422A Incremental = 2 channels A and B in quadrature (90 phase shifted) Signal period Resolution Analogue output signals - type RGH20B Form - 1 Vpp differential Incremental 2 channels V 1 and V 2 differential sinusoids in quadrature (90 phase shifted) 20 µm A B (V 1 +) -(V 1 -) to 1.2 Vpp with green LED indication and 0 R termination (V 2 +) - (V 2 -) Reference = Z Synchronised pulse Z, duration as resolution. Repeatability of position (uni-directional) maintained within ± C from installation temperature and for speed <20 mm/s Reference (V 0 +) - (V 0 -) V Differential pulse V 0-18 to 8 Duration (electrical) Repeatability of position (uni-directional) maintained within ± C from installation temperature and for speed <20 mm/s Limit = Asynchronous pulse Q Limit Asynchronous pulse V q Repeatability <0.1 mm typical Repeatability <0.1 mm typical 1 V Q Length of actuating magnet NOTE: RGH20 readheads are available with reference mark or limit switch output. Select output option at order. (V q +) - (V q -) Length of actuating magnet NOTE: RGH20 readheads are available with reference mark or limit switch output. Select output option at order. Alarm -state alarm For RGH20D, X and Z readheads only, differentially transmitted signals forced open circuit for >20 ms when signal too low for reliable operation. For RGH20W, Y, H, I and O readheads only, differentially transmitted signals forced open circuit for > ms when signals too low or speed too high for reliable operation. = Inverse signals not shown for clarity

15 SECTION 2 - RGH20F/REF system REF interface features Self-tuning active correction The REF interface actively corrects for input signal imperfections to improve system accuracy. Corrections are made for the following: Automatic Offset Control (AOC) adjusts offset independently for the sine and cosine signals. Automatic Gain Control (AGC) ensures consistent 1 Vpp signal amplitude. Automatic Balance Control (ABC) adjusts the gain to equalise the sine and cosine signals. These correction mechanisms operate over the full working speed range of the readhead. System calibration Calibration is an essential operation that optimises the gain, balance and offset of the analogue input signals in the REF interface. These values are stored for initial use at start-up. Before system calibration, install the readhead to maximise the signal strength around the full ring travel as described in Readhead mounting and alignment section. Incremental signal calibration Ensure Automatic Gain Control (AGC) is switched off (CAL/AGC LED on interface is off) before beginning calibration. Press and release the CALIBRATE button on the interface. The CAL/AGC LED will now flash slowly. Rotate the ring at slow speed until the CAL/AGC LED stops flashing. The calibration cycle is now complete. If the calibration fails the CAL/AGC LED will flash quickly instead of switching off. In this case manually exit the calibration routine, restore factory defaults and repeat the calibration procedure. Calibration routine manual exit To exit the calibration routine at any time press the CALIBRATE button. The CAL/AGC LED will stop flashing and values will not be stored. To complete the calibration procedure restore factory defaults and repeat the calibration procedure. Restoring factory defaults When re-installing the system, or in the case of calibration failure, the factory defaults should be restored. To restore factory defaults. Switch the system off. Press and hold the CALIBRATE button whist switching on the power. Release the CALIBRATE button. Repeat the Readhead mounting and alignment procedure and re-calibrate the system. NOTE: The system must be re-calibrated after restoring factory defaults. Switching Automatic Gain Control on or off AGC can be switched on via the REF interface CALIBRATE button. Press and hold the CALIBRATE button on the interface for > seconds to switch AGC on or off. The CAL/AGC LED on the interface will be illuminated when AGC is active. NOTE: The system must be calibrated before switching AGC on. LED indicators REF LED Set-up CAL/AGC Indication Purple Blue Green Orange Red Purple/blank -flashing Red/blank -flashing Red flash when traversing reference mark* Orange flash when traversing reference mark* Blank flash when traversing reference mark* On Off Slow flashing Fast flashing *NOTE: Reference mark flashes only occur up to 0 mm/s traverse speed Alarms can also be output for the following conditions, depending on REF alarm option: Readhead speed in excess of specification Automatic Offset Control excessive Status rmal set-up; signal level 1% to 1% Optimum set-up; signal level 90% to 1% rmal set-up; signal level 70% to 90% Acceptable set-up; signal level 0% to 70% Poor set-up; signal may be too low for reliable operation; signal level <0% Over signal; signal level >1%; system in error Poor set-up; signal level <20%; system in error rmal phasing of reference mark Acceptable phasing of reference mark Poor phasing of reference mark; recalibrate Automatic Gain Control - On Automatic Gain Control - Off Calibrating system Calibration failed Alarm output Yes Yes 1

16 SECTION 2 - RGH20F/REF system (continued) General specifications Power supply V - % +% 200 ma maximum (system) The interface will be fully active <00 ms after power is applied. The interface and readhead are protected from reverse voltage and over voltage of up to V. NOTE: Current consumption figures refer to unterminated interfaces. For digital outputs a further ma per channel pair (eg A+, A-) will be drawn when terminated with 0R. For analogue outputs a further 20 ma will be drawn when terminated with 0R. Power from a V dc supply complying with the requirements for SELV of standard IEC BS EN RGH20F UHV (readhead only) 0 ma Output signals Function Power Incremental signals Wire colours from readhead Red White Green Yellow Input 1 way D-type socket Analogue input Signal Pin V 8 0 V 9 A B Output 1 way D-type plug Digital output Analogue output Signal Pin Signal Pin V 7, 8 V 4, 0 V 2, 9 0 V, 1 A+ 14 V A- V 1-1 Bake-out temperature Sealing (readhead) Ripple 200 m frequency up to 00 khz 0 C (RGH20F UHV only) IP40 Acceleration (readhead) Operating 00 m/s 2, axes Shock (readhead) n-operating 00 m/s 2, ms, ½ sine, axes Reference mark/limit Alarm Blue Pink C Hall 4 1 B+ B- Z+/Q+ Z-/Q- E+ E V 2 + V 2 - V 0 +/V q + V 0 -/V q Vibration (readhead) Operating 0 m/s 2, axes Ired servo Brown Servo Mass Readhead 9 g External set-up V X 1 X 1 Interface Cable (standard) (UHV) 0 g 4 g/m 2 g/m Readhead cable Standard Double shielded, outside diameter 4.2 ±0.2 mm. UHV Flex life >20 x cycles at 20 mm bend radius. Single tinned copper braided shield over PTFE insulated cores. V MID Sin monitor* Cos monitor * Shield Do not connect Interface outputs only V MID Sin monitor Cos monitor Inner Outer Case 14 Outer Case Outer Case 8 NOTE: Standard 1 pin D type connector fitted is not vacuum compatible. t connected *2.2 0% signal amplitude centred on 1. V 2, 1, 14, 1 The RGH20F readheads have been designed to the relevant EMC standards, but must be correctly integrated to achieve EMC compliance. In particular, attention to shielding and earthing arrangements is essential. 14

17 SECTION 2 - RGH20F/REF system (continued) REF installation drawing Dimensions in mm Electrical connections Grounding and shielding 19.2 Output 1 way D type plug RGH20F Inner shield (except UHV) REF interface 0 V power Extension cable Customer electronics V Output signals Outer shield 0 V Pin 1 Maximum cable length: 7 Optional mounting brackets (A ) NOTE: Remove locking posts and discard washers when installing optional brackets. Tighten locking posts to 0. Nm 0 Max. screw size M Set-up LED CAL /AGC LED Calibrate button Input 1 way D type socket NOTE: For installation details see the Interface mounting bracket installation guide (M-99-20) Readhead to interface Interface to controller IMPORTANT: The outer shield should be connected to the machine earth (Field Ground). The inner shield should be connected to 0 V at customer electronics. Care should be taken to ensure that the inner and outer shields are insulated from each other. If the inner and outer shields are connected together, this will cause a short between 0 V and earth, which could cause electrical noise issues. Recommended signal termination Digital outputs Interface A B Z Q E+ A B Z Q E- m Cable Z 0 = 0R Receiver clock frequency (MHz) 220 pf 220 pf # Only required on alarm channel E for fail safe operation. Standard RS422A line receiver circuitry. Capacitors recommended for improved noise immunity Analogue 0 V 0 V 0R 1k 1k V # # 0 V Customer electronics Maximum cable length (m) Analogue output, REF0000 only V q V 0 V 1 V 2 + V q V 0 V 1 V 2-0R 1

18 SECTION 2 - RGH20F/REF systems (continued) Speed Digital systems, maximum speed (m/s) Resolution (µm) nm 20 nm nm nm Minimum receiver clock frequency (MHz) Internal clock frequency (MHz) Interpolation factor (period to resolution) RGH20F + REF0000 analogue output system 0 Signal amplititude (%) Angular speed depends on ring diameter, use the following equation to convert to rev/min: AGC Off AGC On 0 Frequency (khz) Speed (m/s) Angular speed (rev/min) = V x 00 x 0 p D Where V = maximum linear speed (m/s) and D = external diameter of RESR 1

19 SECTION 2 - RGH20F/REF systems (continued) Output specifications Digital output signals - type REF digital Form - Square wave differential line driver to EIA RS422A Incremental = 2 channels A and B in quadrature (90 phase shifted) Analogue output signals - type REF0000 Form - 1 Vpp differential Incremental 2 channels V 1 and V 2 differential sinusoids in quadrature (90 phase shifted) Signal period Resolution 20 µm (V 1 +) -(V 1 -) 1 Vpp (nominal) with AGC active A 90 B (V 2 +) - (V 2 -) Reference = Z Synchronised pulse Z, duration as resolution Wide reference = (option C) Z Synchronised pulse Z, duration as signal period Reference (V 0 +) - (V 0 -) V Differential pulse V 0-18 to 8. Duration (electrical). Repeatability of position (uni-directional) maintained within ± C from installation temperature and for speed <20 mm/s Limit = Repeatability of position (uni-directional) maintained within ± C from installation temperature and for speed <20 mm/s. NOTE: Wide reference mark option useful when using long cable lengths and/or high speed operation to overcome effects of skew. Repeatability <0.1 mm typical Limit (V q +) - (V q -) Repeatability <0.1 mm typical 1 V Length of actuating magnet NOTE: RGH20F readheads and REF interfaces are available with reference mark or limit switch output. Select output option at order. Q Length of actuating magnet Asynchronous pulse Q NOTE: RGH20F readheads and REF interfaces are available with reference mark or limit switch output. Select output option at order. Asynchronous pulse V q Set-up signal - all REF interfaces Alarm = 1 20 ms minimum E Asynchronous pulse E Depending on REF alarm option, alarm asserted when: - 20%> signal amplitude >1% - Readhead exceeds specified maximum speed - Signal offset excessive Voltage at V X /X 0 0 Signal level 0% NOTE: -state alarm options also available for REF digital interfaces. Set-up signal voltage proportional to signal amplitude. = Inverse signals not shown for clarity. 17

20 Renishaw plc New Mills, Wotton-under-Edge, Gloucestershire GL 8JR United Kingdom T +44 (0) F +44 (0) E uk@renishaw.com For worldwide contact details, please visit our main website at RENISHAW and the probe symbol used in the RENISHAW logo are registered trade marks of Renishaw plc in the United Kingdom and other countries. apply innovation and names and designations of other Renishaw products and technologies are trade marks of Renishaw plc or its subsidiaries Renishaw plc All rights reserved Issued 1 *M *