Scale Unit SR84 / SR85, CH33 Read all the instructions in the manual carefully before use and strictly follow them. Keep the manual for future references.
SR84 / SR85, CH33
Safety Precautions Magnescale Co., Ltd. products are designed in full consideration of safety. However, improper handling during operation or installation is dangerous and may lead to fire, electric shock or other accidents resulting in serious injury or death. In addition, these actions may also worsen machine performance.
Caution • Be sure to check the machine and device conditions to ensure work safety before working on the machine. • Be sure to cut off the power supply and other sources of drive power before working on the machine. Failure to do so may result in fire or accidents. • When turning on the power supply or other sources of drive power to operate the machine, take care not to catch your fingers in peripheral machines and devices. General Precautions When using Magnescale Co., Ltd.
[For U.S.A. and Canada] [ For EU and EFTA countries ] THIS CLASS A DIGITAL DEVICE COMPLIES WITH PART15 OF THE FCC RULES AND THE CANADIAN ICES-003. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS. (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) T H I S D E V I C E M U S T A C C E P T A N Y INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDERSIGNED OPERATION. CE Notice Marking by the symbol CE indicates compliance with the EMC directive of the European Community.
(4) (E) SR84 / SR85, CH33
Contents 1. Overview ............................................................................ 1 1-1. 1-2. System Configuration ...................................................................................... 1 Features ........................................................................................................... 1 2. Installation ......................................................................... 2 2-1. 2-2. Names of Parts .....................................................
ii (E) SR84 / SR85, CH33
1. Overview This product is a scale system that outputs position signals for machine tools and other equipment that require high-precision positioning. 1-1. System Configuration Incremental SR84-XXXR (Cable extending to right) 10 nm/50 nm/0.1 µm/0.5 µm/1.0 µm CH33-XXCP, -XXCE, -XXNP, -XXNE SR84-XXXL (Cable extending to left) CH33-XXCP, -XXCE, -XXNP, -XXNE SR85-XXXR (Cable extending to right) 10 nm/50 nm/0.1 µm/0.5 µm/1.
2. Installation For the installation dimensions, refer to section 6, “Dimensional Diagrams.” 2-1. Names of Parts Mounting hole M6 SR84/85 End cover Scale unit Mounting hole M4 Slider CH33 End cover 2-2. Installing the Scale and Slider Notes • Do not turn on the power before installing the scale. • Install the scale with the opening on the scale unit facing downward. If the opening cannot be turned downward, it should face horizontally. Never install it facing upward. (Fig.
• The slider holders are used to secure the slider in place during transport. They are not guides for installation. • Do not take off the slider holders, if possible, until immediately before securing the slider. • Even if the slider holders are removed, the plastic hook provided on the slider allows the slider to maintain an approximate positional relationship with the scale unit. • The plastic hook can come off if the slider is forcibly twisted or other excessive force is applied.
Installation example Example 1 (recommended): Installation when a stop surface of the scale and slider is made with the bracket Scale installation accuracy is improved when a stop surface is made. This also simplifies reinstallation of the scale. 1. Check and adjust the scale bracket’s parallelism with respect to the machine guide, and then secure in place. Even when using divided brackets, adjust the parallelism over the entire bracket length as shown in the figure. 0.05 or less 50 Scale bracket 0.
3. Bring the scale into contact with the stop surfaces and install. Fig. 2-7 Example 2: Installation when a stop surface of the scale and slider is not made with the bracket 1. Adjust the parallelism of the scale bracket and slider bracket with respect to the machine guide, and then secure in place. Adjust the height and parallelism of the slider bracket with respect to the scale bracket, and then secure in place. 5 ±0.2 78 ±0.3 Slider bracket 0.05 MG 78 ±0.3 0.05 or less Scale bracket 0.
2. Adjust the parallelism with respect to the machine guide of the scale rear while measuring the scale rear with a dial gauge. Tighten the set screws. Measure near the installation hole positions at the scale unit rear. 0.1 MG Unit: mm Fig. 2-9 3. Insert the supplied spacer (t = 1.0 mm) in the space between the scale and slider, and then adjust the slider position while bringing the slider into contact with the scale. spacer (t = 1.0 mm) Fig.
3. Scale (SR84/85) and Connecting Cable • Steel bars are used for the scale case to achieve a high rigidity. The magnetic shielding effect of the scale is maintained by installing steel plates inside the scale. • The scale unit and connecting cable are separated by the connector of the scale slider unit. The cable extension direction to the right or left is selected when ordering. • All models use direct output. 3-1. Scale (SR84/85) 3-1-1.
Maximum response speed (m/min) Minimum phase differential time setting (ns) Resolution (µm) 50 100 150 200 250 300 0.01 5 3 2 1 1 1 0.05 25 12 8 6 5 4 0.1 50 25 16 12 10 8 0.5 180 125 80 60 50 40 1 180 180 160 120 100 80 Please contact our sales representative for minimum phase differential times other than those above.
3-1-2. Output Signal (SR85) When the slider is moved in the direction of the arrow, the signal is addition when the polarity is “positive,” and it is subtraction when the polarity is “negative.” The polarity is selected when ordering. Fig. 3-4 The scale uses incremental serial bidirectional communication protocol for conducting data communication with controllers. For information on supported company protocols, contact your Magnescale Co., Ltd. sales representative.
3-2. Connecting Cable (CH33) Note Be sure to use CH33 to satisfy safety standards. 3-2-1. CH33 (cable with unterminated end) Signal Specifications SR85 Cable color SR84 Full duplex Half duplex Brown 0V 0V 0V Black 0V 0V 0V Green +5 V +5 V +5 V Violet +5 V +5 V +5 V (Note 1) CNT(Note 1) Blue A CNT Yellow –A N.C.(Note 2) N.C.(Note 2) Orange B SD N.C.(Note 2) Gray –B –SD N.C.
4. Measures for Operating Environments 4-1. Air purge In the standard configuration, an M5 tap hole for air purging is provided in the end cap section of the scale. Air can be injected into the scale unit to reduce the effects of the environments shown below. The actual effects, however, will vary depending on operating conditions. Therefore, be sure to fully check the effects before using air purge.
Main comsents Manufacturer Model Name Quantity SMC Corporation AF3000-02C Air filter 1 SMC Corporation AFM3000-02C Mist separator 1 SMC Corporation AR3000-02G-1 Regulator with 200 kPa pressure gauge 1 SMC Corporation Y30L Spacer assembly with L-type bracket 2 SMC Corporation KQ2S06-M5 Air nipple 1 Note The air filter and mist separator should incorporate a float-type auto drain (NC) mechanism. Use a drain tube with a diameter of at least 4 mm and length of 5 m or less.
Tube flushing Flush the tube from the air pressure source to the air supply unit connectors and each scale connector. Flushing cleans the tubes, prevents the embedding of foreign objects in the equipment, and is also useful to check the tubes. Air pressure source If a compressor is selected for use, take into consideration the air consumption amount (approx. 30 N /min per scale). The graph below shows the discharged air amount and rated output as a rough guideline for selecting a compressor.
4-2. Oil Lubrication In the standard configuration, an M5 tap hole for air purging is provided in the end cap section of the scale. If using in the following severe environments where air purge alone is not sufficient, oil mist can be injected into the scale to reduce the effects. The actual effects, however, will vary depending on operating conditions. Therefore, be sure to fully check the effects before using oil lubrication.
Main components Manufacturer Model Name Quantity SMC Corporation AF3000-02C Air filter 1 SMC Corporation AL3000-02C Lubricator 1 SMC Corporation AR3000-02G-1 Regulator with 200 kPa pressure gauge 1 SMC Corporation Y30L Spacer assembly with L-type bracket 2 In side tube diameter: ø8, Out side tube diameter: ø6 The air filter should incorporate a float-type auto drain (NC) mechanism. Use a drain tube with a diameter of at least 4 mm and length of 5 m or less.
5. Specifications 5-1. Scale Model name SR84-XXX Item Measuring length (ML) 140 to 3040 mm (24 types) 140, 240, 340, 440, 540, 640, 740, 840, 940, 1040, 1140, 1240, 1340, 1440, 1540, 1640, 1740, 1840, 2040, 2240, 2440, 2640, 2840, 3040 Thermal expansion coefficient 12 ±1 ✕ 10–6/oC Output signal A/B, Reference point line driver signal (compliant with EIA-422) For details, see section 3-1, “Scale (SR84/85).
Model name SR85-XXX Item Measuring length (ML) 140 to 3040 mm (24 types) 140, 240, 340, 440, 540, 640, 740, 840, 940, 1040, 1140, 1240, 1340, 1440, 1540, 1640, 1740, 1840, 2040, 2240, 2440, 2640, 2840, 3040 Thermal expansion coefficient 12 ±1 ✕ 10–6/oC Output signal Incremental serial bidirectional signal, compliant with EIA-485 For details, see section 3-1, “Scale (SR84/85).” Accuracy (at 20 oC) 3 + 3ML/1000 µmp-p or 5 + 5ML/1000 µmp-p Resolution Selectable from 0.01, 0.05, 0.1, 0.5, and 1.
5-2.
6. Dimensional Diagrams MG SR84/85 L1 = ML + 138 L2 = (100 ±0.2) ✕ (n–1) 0.1 29 39 100 ±0.2 12.5 14.5 9.2 78 1 ±0.3 (39) n ✕ ø7, ø11 countersunk depth 6.5 (mounting screws M6 ✕ 35) 28.5 0.05 39 48.5 3.5 (9) 0.1 0.05 MG Air purge hole (M5: Both ends) 100 19.5 5 ±0.2 19 21 0.
20 (E) SR84 / SR85, CH33
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Shinagawa Intercity Tower A-18F, 2-15-1, Konan, Minato-ku, Tokyo 108-6018, Japan SR84 / SR85, CH33 3-219-684-13 2010.4 Printed in Japan ©2007 Magnescale Co., Ltd.
