RGC-3 Digital readout

Transcription

1 User manual M A RGC-3 Digital readout RSLM high accuracy linear encoder

2 EMC compliance The RGC-3 digital readout conforms to the relevant harmonised European standards for electromagnetic compatibility as detailed below. BS EN : 2006 Safety There are no user serviceable parts inside Renishaw mains powered units. Return defective units to an authorised Renishaw Customer Service Centre. It is essential for continued safety that the fuse is replace by the correct type and rating. The approved part is 20 x 5 mm type T0.5A 250 V. For instructions regarding the safe cleaning of Renishaw products, refer to the Cleaning section of the relevant product documentation. Remove power before performing any cleaning or maintenance operations. Refer to the machine supplier s operating instructions. It is the machine supplier s responsibility to ensure that the user is made aware of any hazards involved in operation, including those mentioned in Renishaw product documentation, and to ensure that adequate guards and safety interlocks are provided. Under certain circumstances the readhead signal or RGC-3 s display may indicate a false readhead position. Do not rely on readhead signals or the RGC-3 s display to stop machine movement. 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. Disclaimer Considerable effort has been made to ensure that the contents of this document are free from in ac cu ra cies and omissions. However, Renishaw makes no warranties with respect to the contents of this document and specifically disclaims any implied warranties. Renishaw reserves the right to make changes to this document and to the product de scribed herein without obligation to notify any person of such changes. Contents: 1 Introduction 1.1 General 1.2 Technical specifi cations 2 Installation 2.1 Mounting 2.2 Electrical Grounding 2.3 Power supply 2.4 Fuse protection 2.5 Readhead connections 2.6 Switching on 3 Set-up 3.1 Introduction 3.2 Sleep/Datahold 3.3 Axis resolution 3.4 Display resolution 3.5 Direction 3.6 Radius/diameter 3.7 Linear error compensation Calculating linear error compensation Setting linear error compensation 3.8 Signal failure detection 4 Standard Functions 4.1 Incremental 4.2 Absolute 4.3 Data pre-set 4.4 Units of measurement 4.5 Reference mark registration 5 Cleaning 6 Troubleshooting

3 1 Introduction 1.1 General The RGC-3 digital readout system is designed to be used with Renishaw digital encoder systems. The input and display resolution of each individual axis can be set to match the relevant encoder input. Basic two point compensation can be used as well as reference mark registration. The unit is confi gured to detect 3-state error only. For further information on any of the functions of the unit please refer to the relevant section of this manual. 1.2 Technical specifications Dimensions Height 140 mm, Width 240 mm, Depth 80 mm Weight 2.5 kg Mounting M10 stud Operating voltage 100 V 260 V Supply frequency 50 to 60 Hz Fuse Specifi cation 20 x 5 mm, type T0.5A, 250 V Maximum power consumption 18 VA Power connector IEC 320 Measurement signal input Square wave differential line driver signals to EIA RS422A Error signal input 3-state error Input connector 15 pin D type socket confi gured to Renishaw standard digital encoder output Maximum input frequency 10 MHz Maximum output current 600 ma Resolution (selectable) 10, 5, 2, 1, 0.5, 0.2, 0.1 µm Sealing Indoor use, IP20 (IEC529) Humidity Relative humidity - maximum 80% for temperature up to 31 C decreasing linearly to 33% at 45 C Installation category Transient overvoltage according to installation category II of IEC664 Pollution degree 2 in accordance with IEC664 Operating temperature 0 to 45 C Storage temperature - 20 to 70 C 2 Installation 2.1 Mounting The RGC-3 is supplied with a fi xing kit consisting of an M10 stud, nut and washers. Be sure that the mounting arrangements are secure, as the operator will need to apply pressure to the front of the panel when using the keypad. Select the location of the RGC-3 with due regard to safety and ease of operation. Keep clear of moving parts. Ensure the natural ventilation around the cabinet is not restricted. 2.2 Electrical grounding To ensure the correct operation of the RGC-3, it is recommended that the unit s case be grounded to the machine upon which it is fi tted. Use a wire strap of at least 1.5 mm 2 (16AWG) from the cabinet equipotential terminal (see fi gure 1) to a suitable point on the machine body. The wire should be as short as possible. The machine should also be properly grounded to a good earth point. 2.3 Power supply The mains supply is connected through a detachable supply cord fi tted with an industry standard IEC320, 10A, EARTHED mains connector with a cord rated for at least 10A and a suitable earthed plug. The PROTECTIVE EARTH CIRCUIT of the mains supply MUST BE CONNECTED to the protective earth terminal of the cabinet through the supply cord. The supply cord should be secured to the mounting arm or pillar with cable ties to ensure that it cannot drop into a hazardous position, i.e. the fl oor, when disconnected from the unit. The supply cord must be routed away from moving parts or sources of heat.

4 Figure 1. Rear of RGC-3 15 pin D type sockets 2.5 Readhead Connections Figure 1 shows the 15 pin D type connection sockets on the back of the RGC-3. The RGC-3 is designed for use with Renishaw digital encoders only. Switch off the RGC-3 before connecting or disconnecting the encoders. To fi t the connectors into the appropriate socket on the back of the RGC-3, fi rst align the connector and then push fi rmly into place. Tighten the connector screws to ensure mechanical stability and electrical connection. Input connection diagram Function Signal 15 pin 'D'type Power 5 V 0 V 7, 8 2, 9 Incremental signals A B Equipotential terminal Power switch Fuse Power cable input Reference mark Shield Z Inner Outer Case 2.4 Fuse Protection The mains supply fuse is a 20 x 5 mm, type T0.5A, 250V. It is not to be replaced by the operator. If the fuse blows it may indicate a signifi cant problem with the power source. Check the supply and wiring carefully. If the fuse is replaced, the unit must fi rst be disconnected from the supply by removing the IEC socket from the input. NOTE: IF THE EQUIPMENT IS USED IN A MANNER NOT SPECIFIED BY THE MANUFACTURER, THE PROTECTION PROVIDED BY THE EQUIPMENT MAY BE IMPAIRED. 2.6 Switching on The mains supply switch for the RGC-3 is located on the back of the unit as shown on Figure 1. When the RGC-3 is switched on, the unit will automatically go through a brief self-diagnostic routine. During this routine the word DIGITAL will be shown, then all the segments of the display will be lit. After this routine, the unit will display measurements and is ready for use.

5 3 Set-up Figure 2. Front of RGC-3 Axes Display Function Keys Concealed Set-up Key Figure 3. Map of set-up menu options [abs/inc] [Xo], [Yo] or [Zo] Axis display Sleep/Datahold On Off SLP On SLP OFF Axis Resolution Ar 0.01 Ar Ar Ar Ar Ar Ar Introduction The set-up procedure allows the main default settings for the RGC-3 to be changed. For normal use, the set-up procedure only needs to be performed once and it is possible that the factory defaults are suitable for use without change. The set-up procedure can only be activated just after power is switched on. After switching on, press the concealed key which is located under the R of the RGC-3 on the keypad (see Figure 2). The key must be pressed before the end of the initial self-diagnostic routine. Display Resolution Direction Positive Negative dr 0.01 dr dr dr dr dr dr dir. 0 dir. 1 When the set-up routine is entered, the letters SET-UP appear in the centre display. The set-up procedure utilises a menu system. The main menu consists of a list of options that can be customised for ease of use (see Figure 3). Simply press the [abs/inc] key to scroll through this list until the option to be changed is reached. To change the option, press [Xo], [Yo] or [Zo] for the relevant axis to be confi gured. Radius/diameter Linear error compensation Radius Diameter User Defi nable rad dia LC 0 To save the changes, scroll past the changed option to the next (i.e. Press [abs/inc]). To exit the set-up routine, press the concealed key R of RGC-3. Signal Failure On Off FAIL On FAIL OFF

6 3.2 Sleep/Datahold Datahold allows the RGC-3 to be disabled, but retains the power to the encoder and the memory circuits. Datahold can be used to prevent unauthorised or accidental use of the RGC-3 whilst unattended. While the RGC-3 has been set to Datahold, the keypad will not function and the displays will be blank. If the machine axis is moved, DISPLACD (displaced) will appear in the display window. The RGC-3 will continue to record all the encoder movement and will update the display once Datahold is cancelled. If a key is pressed, TOUCHED (touched) will appear in the display to alert the operator that access to the data entry has been attempted. In the set-up routine, press the [abs/inc] key until SLP ON is displayed. Press [Yo] and the choice of SLP OFF appears. Pressing the [Yo] key toggles between SLP ON and SLP OFF. Select SLP ON if the Datahold facility is required, otherwise select SLP OFF. When selection is made, press the [abs/inc] key to store the change and move forward to the next option. 3.3 Axis resolution IMPORTANT: The axis resolution of the RGC-3 must be matched to the resolution of the encoder system being used. The available options are: 10 µm, 5 µm, 2 µm, 1 µm, 0.5 µm, 0.2 µm, and 0.1 µm In the set-up routine, press the [abs/inc] key until Ar (Axis resolution) is displayed. The display will show the last selected resolution e.g. Ar Press the [Xo], [Yo] or [Zo] key to change the resolution for each axis as required. When selection is made press the [abs/inc] key to store the change and forward to the next option. 3.4 Display resolution This option allows the display resolution to be selected. The values are the same as detailed for the axis resolution, noting that the smallest available increment is limited to that selected for the Axis resolution. In the set-up routine, press the [abs/inc] key until dr (display resolution) is displayed. The display will show the last selected resolution e.g. dr Press the [Xo], [Yo] or [Zo] key to change the resolution for each axis as required. When selection is made press the [abs/inc] key to store the change and forward to the next option. 3.5 Direction The direction option allows the direction for each axis of travel to be changed. For example, if after installation the X axis is measuring positive from right to left, this option can be used to change the direction so it measures positive from left to right. In the set-up routine, press the [abs/inc] until DIR (direction) is displayed. Each axis display will show 0 or 1. Pressing each axis key [Xo], [Yo] or [Zo] reverses the counting direction for each axis. When the RGC-3 is displaying the desired choices, press [abs/inc] to save the settings and continue to the next option. 3.6 Radius/diameter This option allows any axis to be selected to display measurements at a two times (x2) factor. This is used on turning applications to display part diameter rather than part radius. In the set-up routine, press the [abs/inc] key until RAD or DIA is displayed. Pressing each axis key [Xo], [Yo] or [Zo] switches between radius and diameter reading for that axis. When the RGC-3 is displaying the choices to be used, press [abs/inc] to save the settings and continue to the next option. 3.7 Linear error compensation This option allows a constant correction factor to be applied to the measurements, with the resultant displayed. This factor is expressed in Parts per Million (PPM) Calculating Linear error compensation To establish a multiplication factor, check the measurements displayed by the RGC-3 axis against a known distance or against a laser calibration system. The multiplication factor should be established whilst in operational mode and NOT in the set-up routine. For example, if the RGC-3 displays mm against a known (actual) distance of mm, the correction factor to be applied is: 0.005/500 x 1,000,000 = 10 PPM If the RGC-3 displays over the same reference distance, the correction factor would be: /500 x 1,000,000 = -10 PPM WARNING: Once the multiplication factor has been entered for an axis, all measurements will be adjusted accordingly. To disable this adjustment, a compensation factor of zero must be entered.

7 3.7.2 Setting linear error compensation In the set-up routine, press the [abs/inc] key until LC (linear compensation) is displayed. The display will show LC 0 or the last correction factor entered. To insert or change a correction factor, select the axis and enter the factor to be used. For example, to apply a factor of 200PPM to the X-axis, press the following [X] [2] [0] [0] [ent]. If the unit is displaying measurements less than the actual measurement, enter a positive compensation factor. A factor of 200 PPM means the displayed value is the measurement x When the RGC-3 is displaying the correct factor, press [abs/inc] to save the settings and continue to the next option. 3.8 Signal failure detection This option allows the user to activate/deactivate the signal failure detection circuit. A signal failure is displayed when incremental channels are 3-stated, indicating an encoder error or open circuit condition. In the case of Renishaw encoders, 3-stating is asserted when the signal level drops to an unacceptable level. Once a signal failure has been registered, the RGC-3 will display SIG FAIL alongside the relevant axis. To reset the signal failure detection circuit, the relevant [Xo], [Yo] or [Zo] button must be pressed. It should be noted that the reason for the signal failure should be addressed to prevent an immediate reoccurrence of this state. To leave the set-up routine, press the concealed key, R of RGC-3. 4 Standard functions 4.1 Incremental When the RGC-3 is set to incremental mode, it can be used to display each new position relative to the last. This is also known as point to point use. On setting to incremental, each axis can be reset by pressing [Xo], [Yo] or [Zo]. As an alternative to resetting the axes, the co-ordinates can be entered relative to the current incremental position. Each time the incremental mode is selected, the RGC-3 display will show the position relative to the last reset position whilst in the incremental mode. Operator steps Set to incremental mode Reset axes Enter the co-ordinates of a position, e.g. X100, Y50, Z25 Keystrokes [abs/inc] [Xo] [Yo] [Zo] [X] [1] [0] [0] [ent] [Y] [5] [0] [ent] [Z] [2] [5] [ent] Axes display X Y Z X Y Z Absolute When the RGC-3 is set to absolute mode, it will display the position relative to an established datum point. When the display is reset in absolute mode, the current position of the machine is set as the datum point. All absolute positions will be measured relative to this datum. To set the datum, position the machine at the point intended to be established as the datum and then reset any or all of the axes, whilst in the absolute mode. Operator steps Set to absolute mode Reset axes Keystrokes [abs/inc] [Xo] [Yo] [Zo] Axes display X Y Z 0.000

8 4.3 Data pre-set To pre-set an axis dimension the following steps are required. Operator steps To enter a negative dimension for the X axis Keystrokes [X] [±] [1] [9] [.] [6] [ent] Axes display X Dimensions can be entered in either the absolute or incremental modes. Pressing the [ce] key will clear the entered values. 4.4 Units of measurement To change between millimetre and inch readings, press [in/mm]. The displayed data will be converted instantly. The LED beside the key indicates which mode is being used. When the RGC-3 is powered up it will display the unit of measurement set prior to power loss. 4.5 Reference mark registration To reference an axis to a reference mark, fi rst press and release the [ref] button and then the axis button to be referenced [Xo], [Yo] or [Zo]. The display will now show ref 0. It will start counting from zero after detecting a reference mark signal from the readhead. Note that the reference mark signal from Renishaw readheads is uni-directional and must be set-up to produce a repeatable signal in the desired direction. For further information on how to do this, please refer to the Renishaw readhead installation guide. 5 Cleaning Disconnect the unit from the power supply before cleaning. It is recommended that the unit be wiped over with a lint free cloth with a non-corrosive/non-abrasive cleaning fl uid. Do not use compressed air. 6 Troubleshooting Symptom Nothing happens when the unit is switched on. When the unit is switched on, the displays are frozen. The displays work, but reset from time to time without the keys being pressed. The displays work, but give erratic readings, the last digit jitters or the measurements jump to new fi gures unexpectedly. SIG FAIL appears in the display. The unit will not respond to any keys Solution Check that the RGC-3 is correctly connected to a working power source. Check the power lead is not damaged. Check the fuse. Note that if the fuse has blown, this suggests a fault with the power source, which must be corrected before the fuse is replaced (see section 2.3). Mains supply voltage is too low. Check that the power source is within the limits accepted by the RGC-3 (see section 1.2). Mains supply voltage is too low, or the power source has an intermittent fault. Check the power source as above. Check that all connections are good. Poor earth (ground) connection. Both the RGC-3 and the machine upon which it is installed must have proper earth connections (see section 2.2). This means that the unit is not receiving a proper signal from the encoder. Check that the encoder is set-up correctly indicated by a green LED from Renishaw readheads. Check that the encoder connection is good. Check that there is no damage to the connectors or to the encoder lead. If only one axis is displaying this message, connect the encoder from a working axis into the faulty axis. If the same message appears, the fault is likely to be in the RGC-3 and you should contact your local Renishaw service centre. NOTE: THE RELEVANT [Xo], [Yo] OR [Zo] KEYS MUST BE PRESSED TO REMOVE THE SIG FAIL MESSAGE. Switch the RGC-3 off and back on. Note you will not lose your current position by switching off and on as long as the encoder is not moved with the power off.

9 Renishaw plc New Mills, Wotton-under-Edge, Gloucestershire GL12 8JR United Kingdom T +44 (0) F +44 (0) E uk@renishaw.com RSLM high accuracy linear encoder For worldwide contact details, please visit our main website at 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 Renishaw plc All rights reserved Issued 0309 *M *