Summary of Contents for SKF CMSS 785 Series
- Page 1 User manual Eddy Current Probe Systems CMSS 785 Series, API-670 Proximity transducers, 5 and 8 mm...
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Page 2: Important Information
Important information Thank you for purchasing the CMSS 785 Proximity Transducer Sys- • Whilst the CMSS 785 series has been comprehensively evaluated tem. This instruction manual (referred to as “this manual” hereafter) in respect of EMC (electro-magnetic compatibility), test and real... -
Page 3: Table Of Contents
Contents Important information ....... . Contents ..........1. -
Page 5: Safety Information
1. Safety information Read this section carefully in order to be able to use this product safely. 1.1. Warning symbols In this document, rules that must be followed in order to prevent injury or financial loss and for the safe usage of this unit, are labeled with the following markings. Make sure to understand the content of these cautions and to follow the guidance provided. -
Page 6: Important Precautions
1.2 Important precautions Be sure to observe the following instructions for safe use of this unit. Prohibited actions CAUTION DANGER Do not use transceivers and other radio equipment/cellular Never disassemble or modify this unit. phones in close proximity to this unit. If it or the signal cables are Do not use the unit under conditions outside the limits detailed exposed to EMI (Electromagnetic Interference), the unit may not in the specifications. -
Page 7: Introduction
2. Introduction 2.1 Measurement principles This unit (probe, extension cable, driver system) provides a means for non-contact measure- ment of the distance (gap) between the probe tip and the measured object (target), by out- putting a voltage signal corresponding to that gap. CMSS 75 Probe Connector CMSS 985 Extension cable... -
Page 8: Applications
• A 5 m driver being used in a 9 m system (or vice versa). • The shortening or lengthening of the cable between the probe and driver. • The inclusion of any non-CMSS 785 system components, including from earlier SKF systems. -
Page 9: Part No. And Dimensional Data
3. Part no. and dimensional data 3.1 Probes Three basic probe types are available: a 5 mm diameter tip, 8 mm tip and a reverse mount 8 mm tip. These three are mechanically different but electrically equivalent: when considering permis- sible system combinations only the cable length has to be considered, as described in 2.3 above. - Page 10 CMSS 75-L standard probe (without armour) Sensor tip Lock nut Threaded area Connector Cable ∅ 2,7 ∅5 (0.2˝) ∅7,1 (0.28˝) 5 (0.2˝) (0.2˝) 3 (0.12˝) +30% –0% Example CMSS 75-LM1-06-25-10 5 mm, no armour, thread size M8x1, unthreaded length (L ) 60 mm (06 = 60 mm), case length (L ) 250 mm (25 = 250 mm), cable length (L...
- Page 11 3.1.2 Probes: 8 mm CMSS 78: 8 mm probe Armor Without armor With armor (without fluoro resin coating) Thread size M10×1 3/8-24 UNF Unthreaded length (if M2) 10 mm increments, 0–230 mm; L1 ≤ L2–20 mm e.g. 06 = 60 mm Unthreaded length (if U2) 0.1 inch increments, 0–9.2 in L1 ≤...
- Page 12 CMSS 78-L standard probe (without armour) Lock nut Sensor tip Threaded area Cable ∅ 3,6 Connector (0.31˝) ∅8 (0.28˝) ∅7,1 5 (0.2˝) (1.97˝) 3 (0.12˝) +30% –0% Example CMSS 78-LU2-00-12-10 8 mm diameter probe, no armour, 3/8-24 UNF thread, unthreaded case length (L ) 0 in, case length (L ) 1.2 in, pigtail cable length (L ) 1 m...
- Page 13 3.1.3 Probes: 8 mm reverse mount CMSS 78-R: 8 mm reverse mount probe Thread size M10×1 3/8-24 UNF Unthreaded length 05 = 5 mm 02 = 0.2 inches Case length 03 = 30 mm 12 = 1.2 inches Cable length 0,5 m 1,0 m 5,0 m...
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Page 14: Extension Cables
3.2 Extension cables Extension cables are chosen such that the probe + extension cable lengths match the desired system length (5 or 9 m). If a probe with a full system length integral cable is used, no exten- sion cable is required/can be used. CMSS 985 Armor Without armor... -
Page 15: Drivers
3.3 Drivers In addition to the two available system lengths, the drivers can be provided with a choice of mechanical mounting. CMSS 785 System cable length Mounting plate DIN rail (35 mm) mount Screw mount, multi-pitch (50,8 × 50,8 mm and 92 × 31 mm) CMSS 785-11, CMSS 785-21 Unit: mm (1.4˝) -
Page 16: Installation Guidelines/Planning
4. Installation guidelines/planning CAUTION • Locate the driver away from motors and relays. Install the input/output signal cables away from power and control system cables. Noise occurring due to motor or relay operation can adversely affect the unit. We recommend using separate wiring ducts. •... -
Page 17: System Installation Requirements
It is essential that the probe be rigidly mounted, yet easily adjusted (SKF mounting accessories are ideal for this). The target material, target surface finish, flatness and size can all affect the output character- istic. - Page 18 4.1.3 Probe mounting Ensure that the probe mounting location satisfies the following environmental and installa- tion requirements. Environmental conditions • Probe temperature: must always be in the range between –40 to 177 °C. • Vibration levels at the probe: must be 10 m/s or less (10 to 150 Hz), noting however that if the sensor vibrates, an accurate measurement cannot be made.
- Page 19 System characteristic affected Recommended Installation example 1 (most recommended) Installation example 4 Attachment plate If dimension X is less than 9 mm, it will be affected by the attachment plate. Dimension X is to be Target Target 9 mm or more. Probe Installation example 5 Installation example 2 (recommended)
- Page 20 4.1.4 Driver The driver should be installed in a location that satisfies the following environmental and installation requirements. Environmental conditions • Temperature: the temperature of the driver must remain within the range –40 to 80 °C. • Ambient humidity: must be in the range 30 to 95% RH (non condensing). •...
- Page 21 CMSS 785-11 and CMSS 785-21 types are DIN Rail mounting The CMSS 785 rail mount versions are designed to be mounted on a 35 mm DIN rail, (sym- metrical/top hat/TS35). In both cases: • Be sure to allow sufficient space between the driver and the enclosure walls for the probe cable connection to the driver and also allow an appropriate spacing between drivers for the monitor cabling.
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Page 22: Emc Considerations
4.2 EMC considerations CAUTION The driver and extension cable should be installed as shown below to protect from elec- tromagnetic influence. EMC test conditions Metal conduit Extension cable Driver Metal case Metal conduit Item Material Remark Metal conduit Steel Thickness: 1,6 mm or more Metal case Steel... -
Page 23: Fitting System Components
5. Fitting system components DANGER Installation work, wiring and connections must be performed by a person with appropri- ate knowledge of and experience in, instrumentation systems. CAUTION • Before handling this unit, be sure to touch a grounded metal item to discharge any static electricity. -
Page 24: Probe And Extension Cable Installation
5.1 Probe and Extension Cable installation Ensure the probe location and target preparation meets the objectives/requirements of sec- tion 4. The following describes the actual installation of the probe. Both examples illustrate the use of a CMSS VZ-05A sensor housing, at the interface to the machine, to potentially contain the probe to extension cable connection. - Page 25 5.1.2 When using the CMSS VZ-10A sensor sleeve The sensor sleeve is designed to be used with the reverse mount probe. 1 Ensure the supplied aluminum gasket (packing) is fitted to the CMSS 78-R probe. 2 Install the probe into the CMSS VZ-10A sensor sleeve. 3 Attach the CMSS VZ-10A sensor sleeve to the mounting (machine casing).
- Page 26 5.1.3 Probe to Extension cable connection (when used) Connector (jack) When using the extension cable, connect the probe and extension cable as shown in the adjacent diagrams. Insulation sleeve Extension cable 1 Confirm that there are no foreign objects in either the probe or extension cable connectors. Dirt or debris trapped in the connector will cause a poor connection and produce unwanted Probe connector Connector (jack)
- Page 27 5.1.4 Probe/extension cable connection to driver Collar Connect the probe or extension cable to the driver, as follows. Connector • Confirm that there are no foreign objects in the probe (or extension cable) connector, or in the driver sensor input connector. Dirt or debris trapped in the connector will cause a poor Sensor connection and produce unwanted measurement characteristics.
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Page 28: Driver Installation
5.2 Driver installation The driver installation differs according to the model/method of attachment: • CMSS 785-12 and CMSS 785-22 are screw mounting • CMSS 785-11 and CMSS 785-21 are DIN Rail mounting 5.2.1. Installation of panel mounting drivers The CMSS 785 screw mount versions are designed to be directly mounted on an enclosure back panel or plate. -
Page 29: Making Connections To The Monitoring System
5.3 Making connections to the monitoring system The driver has four spring loaded terminals for connections with the Terminal arrangement monitoring system. Case of spring lock terminal At the driver these are marked, OUT (Output), COM (Common), -24 V (Supply) and Shield(COM): Terminal no. -
Page 30: Probe Gap Voltage Confirmation
5.4 Probe gap voltage confirmation It will be necessary to confirm the probe gap voltage in the following circumstances. • During installation/commissioning of the system. • Thereafter annually (unless the gap voltage is continuously/regularly monitored). • If a problem is suspected or the monitoring system indicates unexpected gap changes or sensor fault. -
Page 31: Service/Inspection Recommendations
6. Service/inspection recommendations The following is a description of maintenance and inspection procedures applicable to this unit. 6.1 Periodic inspection In order to maintain system performance and stability, check the probe gap voltage at least once a year. Refer to “5.4 probe gap voltage confirmation” for relevant guidance. 6.2 Unit life Even if no problem is apparent, we recommend that the product be replaced every 10 years. -
Page 32: Troubleshooting
6.3 Troubleshooting Symptom Possible cause Investigative/corrective actions Output is 0 V and unchanging. Power is not ON. Turn the power ON. Check directly at the driver terminals that the correct supply voltage is present. The driver is not connected properly. Refer to 5.3 “Making connections to the monitoring sys- tem”, and wire correctly. -
Page 33: Information About Intrinsically Safe Applications
7. Information about intrinsically safe applications 7.1 CSA Installation 7.1.1 System drawing DANGER WARNING • Non-hazardous area apparatus unspecified except that it must not be supplied from nor Mixing probe, cable or driver revisions in hazardous areas will invalidate intrinically safe approval. contain under normal or abnormal conditions. -
Page 34: System Drawing, Cont
7.1.1 System drawing, cont. 7.1.2 Label information The label is applied to the driver module case. -
Page 35: Atex Installation
7.2 ATEX Installation 7.2.1 System drawing 7.2.2 Applicable standards ATEX • EN 60079-0 : 2012 + A11 : 2013 • EN 60079-11 : 2012... -
Page 36: Label Information
7.2.3 Label information XXX represents the year of manufacture. (eg. 2015 is written in the part of ****** if the production is manufactured in 2015.) The label is applied to the driver module case. -
Page 37: Appendix A - Product Specifications
Appendix A – product specifications Measurement Capability* Linear range 2 mm (78.7 mil) Measurement range 0,25 to 2,25 mm (9.8 to 88.5 mil) from sensor tip Scale factor 7,87 V/mm (200 mV/mil) Scale factor tolerance ±5% for 5 m systems, ±6,5% for 9 m systems Linearity (5 m systems) Within ±25 μm (±1 mil) of a straight line of 7,87 V/mm (200 mV/mil) Linearity (9 m systems) -
Page 38: A1 - Frequency Response Graph
A1 – Frequency response graph Magnitude [dB] –2,0 –4,0 –6,0 –8,0 –10,0 1 000 10 000 100 000 Frequency [Hz] 3,15 Vp-p (400 µm p-p) 10 Vp-p... -
Page 39: Appendix B - Influences On The Output Characteristic
Appendix B – Influences on the output characteristic Comparison of the standard & likely actual output characteristics due to environment, driver power supply and target condition, influences. B1 – Standard static characteristic Target material: SCM440, flat face (dia. 15 mm or more). Nominal Scale Factor (SCF) is 7,87 mV/μm (200 mV/mil). Output [V] –24 –20... -
Page 40: B2 - Sensor Temperature Characteristics (5 M System)
B2 – Sensor temperature characteristics (5 m system) Output [V] –24 –20 –16 –12 –8 –4 Gap [mm] SCF error [%] –5 –10 Gap [mm] LIN [% of F.S.] –2 –4 Gap [mm] –35 °C 0 °C 25 °C 45 °C 120 °C... -
Page 41: B3 - Driver Temperature Characteristics (5 M System)
B3 – Driver temperature characteristics (5 m system) Output [V] –24 –20 –16 –12 –8 –4 Gap [mm] SCF error [%] –5 –10 Gap [mm] LIN [% of F.S.] –2 –4 Gap [mm] –35 °C 0 °C 25 °C 45 °C 65 °C 41 41... -
Page 42: B4 - Effect Due To Driver Supply Voltage Variation
B4 – Effect due to driver supply voltage variation Output [V] –24 –22 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 Gap [mm] –18 V –20 V –22 V –24 V –26 V... -
Page 43: B5 - Response To Different Target Materials
B5 – Response to different target materials Probe Target Output [V] –24 –22 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 Gap [mm] SCM440 SNCM439 S45C SUS304 43 43... -
Page 44: B6 - Effect Due To Target Diameter
B6 – Effect due to target diameter Target material: SCM440 Probe ∅D Target Output [V] –24 –22 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 Gap [mm] D = ∞ D = 20 mm D = 15 mm D = 10 mm 44 44... -
Page 45: B7 - Effect Of A Curved Target Surface
B7 – Effect of a curved target surface Target material: SCM440 Probe Target ∅D Output [V] –24 –22 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 Gap [mm] D = ∞ D = 20 mm D = 15 mm D = 10 mm 45 45... -
Page 46: B8 - Effect Due To (Abrupt) Target Edge
B8 – Effect due to (abrupt) target edge Target material: SCM440 Target Probe Output [V] –24 –22 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 Gap [mm] X = ∞ X = 9 mm X = 7,5 mm X = 5 mm X = 0 mm... -
Page 47: B9 - Effect Due To The Proximity Of A Side Wall
B9 – Effect due to the proximity of a side wall Target and side wall material: SCM440 Side wall Target Probe Output [V] –24 –22 –20 –18 –16 –14 –12 –10 –8 –6 –4 –2 Gap [mm] X = ∞ X = 12 mm X = 9 mm X = 7,5 mm... -
Page 48: Appendix C - Cable Wiring/Laying Recommendations
Appendix C – Cable wiring/laying recommendations The following recommendations are typically made to avoid issues arising from cable laying and installation. • Pulsed signals (phase marker, rotation) are preferably to be on a separate cable from vibration and similar signals. •... -
Page 50: Appendix D - Limited Warranty
On-line System is during the life of such products, SKF, in below (the “Products”), when properly shipped by SKF to Buyer, two (2) years from its sole discretion, will repair, replace or installed, maintained and operated, will be... - Page 51 BY SKF TO MAKE ANY FURTHER OR tion, improper repair or alteration, or main- CONTRARY INDEMNITIES, REPRESENTA- (F) IN NO EVENT SHALL SKF BE LIABLE OR tenance, neglect, excessive operating condi- TIONS OR WARRANTIES ON BEHALF OF OBLIGATED TO THE BUYER OR ANY tions or for defects caused by or attributable SKF.
- Page 52 | www.skf.com/cm ® SKF is a registered trademark of the SKF Group. User manual No. © SKF Group 2020 15V-090-00062-100 The contents of this publication are the copyright of the publisher and may not be reproduced (even Published in August 2020 extracts) unless prior written permission is granted.
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