Machine Condition Transmitter (MCT) CMSS530(A) and
Contents
1. is minimized by selecting the Hanning window may cause low frequency problems which result in ski slopes after integration These possible ski slope effects may have large influences on the RMS overall velocity reading Peak Detection in Velocity The MCT velocity modules with peak detection provide a true peak reading in contrary to the older MCM modules which provided a pseudo peak derived from the RMS reading True peak detection typically results in higher values when data is collected at the same measurement location over the same frequency range The data can be trended and analyzed nonetheless If the user is more familiar with the Calculated Peak RMS x 1 414 specify the RMS detection when ordering Select an approximate 1 4 times higher full scale value to get the same results For example the older MCM has a full scale of 1 IPS and peak pseudo detection An MCT velocity module with a full scale of 1 5 IPS and RMS detection will deliver the same results Mechanical Condition Transmitter MCT 2 13 User Manual Installing the Machine Condition Transmitter User Notes User Notes 2 14 Machine Condition Transmitter MCT User Manual Appendix General Severity Level Guidelines When considering severity levels be aware that standards can only provide general guidelines to determine initial alarm settings Such guidelines should never substitute experience and good judgement The most reliable method of determinin2. removed and an OK condition exists When configured for use with an electro mechanical transducer E the OK circuit will only detect an open circuit condition of the transducer cable Output 4 20 mA Output The primary output of the transmitter monitor is the 4 20 mA current output which is scaled proportional to the full scale range of the unit For example if the range is 0 1 IPS peak then 4 mA indicates a reading of 0 00 IPS and 20 mA indicates a reading of 1 00 IPS peak This output is intended to drive a maximum resistive load of 500 Ohms with respect to system common at the PLC DCS input A precision 0 25 watt 250 Ohm resistor is the recommended load This will convert the 4 20 mA current reading to a 1 to 5 Vdc reading for the PLC DCS For example if the range is 0 to 0 5 IPS then 1 Vdc indicates a reading of 0 IPS and 5 Vdc indicates a reading of 0 5 IPS A short to ground common on this output will not cause damage The relationship of the measured vibration parameter to the output current is displayed in the following equation Units of Vibration EC CU FullScale Value m Example Measured Current 12 mA Full Scale 1 IPS Converted Output Reading un x1IPS 0 5 IPS m Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Output The relationship of the measured vibration parameter to the output voltage when using a 250 Ohm resistor is displayed in
3. MI 1 12 F Filter Enveloped Acceleration 2 5 Filters Velocity 2 4 Full scale 1 5 G Grounding 1 11 H High pass filters 2 4 Installation Precautions 2 4 ISO A 1 J Jumper Locations 1 6 L Latching Non latching Alarms 2 9 Low pass filters 2 4 Index 1 M Microlog 1 1 1 14 P Peak Detection 2 13 Power Supply Distribution 1 9 Preset Options 1 5 R RMS 1 1 RST terminals 2 9 T Transducer Cable 1 12 Transducer OK Circuit 1 12 Trip multiply 1 3 Trip Multiply 2 9 Typical Power Wiring Configuration 1 10 V Vibration Enveloped Acceleration A 3 Velocity A 1 Index 2 Machine Condtion Transmitter MCM User Manual
4. Machine Condition Transmitter MCT CMSS530 A and CMSS590 A SKF Condition Monitoring User Manual Part No 31871000 EN Revision A User Manual Copyright 2002 by SKF Condition Monitoring Inc All rights reserved 4141 Ruffin Road San Diego CA 92123 1841 USA Telephone 858 496 3400 Fax 858 496 3531 Customer Service 1 800 523 7514 SKF Condition Monitoring Area Centers North and South America 4141 Ruffin Road San Diego California 92123 USA Telephone 858 496 3400 FAX 858 496 3531 Asia Pacific No 1 Changi South Lane Level 2M Singapore 486070 Telephone 65 68767591 FAX 65 68767708 Visit us at our web site www skfreliability com SKF Condition Monitoring Service Policy Warranty Disclaimer and Limitation of Remedies EXCEPT FOR THE LIMITED WARRANTY DESCRIBED BELOW THERE ARE NO WARRANTIES EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ALL SUCH WARRANTIES ARE EXPRESSLY AND SPECIFICALLY DISCLAIMED The MACHINE CONDITION TRANSMITTER is guaranteed free of defects in material and workmanship Electronic components are guaranteed for a period of twelve 12 months mechanical components transducers and cable assemblies are guaranteed for a period of ninety 90 days The warranty period begins on the date the system is shipped from the SKF Condition Monitoring factory This warranty does no
5. User Manual Installing the Machine Condition Transmitter Opening the Case Figure 2 2 Transmitter Monitor Separated at Center As the two sides start to separate you will see that a short ribbon cable inside holds them together To remove this cable carefully pull it away from the left hand side ofthe unit as viewed from the front The cable stays with the right hand side permanently Important When reinstalling this cable make sure it is properly connected to the mating connector and that the bend in the cable goes towards the front panel side of the unit If the unit is closed with the bend towards the back the ribbon cable can be damaged Also make sure the ribbon cable connector does not catch on the relays when pressing the unit back together Mechanical Condition Transmitter MCT 2 3 User Manual Installing the Machine Condition Transmitter Setting Monitor Alarms MCT Enveloped Acceleration Filter Selection The enveloped acceleration transmitter is delivered with three standard band pass filters Table 2 1 shows the available filters for each unit Filter Band BandPass Fmax Old MCM Jumper Number Filter Setting for Filter Setting Microlog Frequencies Microlog Range for Hz When Reference Compared Hz 2 50 to 1 000 100 44 E4 and E7 3 500 to 1 000 66 E3 and E6 10 000 4 5 000 to 10 000 88 E2 and E5 40 000 Table 2 1 Integrated Enveloped Acceleration Fil
6. a digital voltmeter knowledge of the transmitter s full scale range and the desired setpoint as a percentage of the full scale range The voltage measured at the BNC will vary between 0 Vdc and 5 Vdc corresponding to 0 to full scale For example 2 5 Vdc represents 50 of full scale 3 75 Vdc represents 75 of full scale To calculate the required setpoint voltage use the equation 5 xx where xx is the desired percentage expressed as a decimal fraction of the full scale range For example 5 60 3 00 Vdc for a setpoint of 60 of the full scale range Turning the potentiometer clockwise increases the setpoint voltage Mechanical Condition Transmitter MCT 2 5 User Manual Installing the Machine Condition Transmitter Setting Monitor Alarms Top Pluggable Terminal c os C V MWADV Front QOOOOO Back Power supply GND Power supply 24 Voc 110 mA Figure 2 4 Setting Alarm Levels 2 6 Machine Condition Transmitter MCT User Manual Installing the Machine Condition Transmitter Setting Monitor Alarms Alert and Danger Alarm Delays Adjustment The Alert and Danger alarm delays can be independently set by internal jumper selection to 1 1 3 6 or 10 seconds The purpose of the delay is to reduce nuisance alarms caused by external electrical noise and or transient vibration events Both the Alert and Danger delays are factory set to the 3 second position To change the delay open the unit and move the dela
7. a permanent monitor such as the MCT system is installed The knowledge of those measurements and the machine behavior provides a good indication of effective alarm level settings A 4 Machine Condition Transmitter MCT User Manual General Severity Level Guidelines Vibration Enveloped Acceleration Measurements 100 33 3 To be used with CMSS793 797 accelerometers CMVA55 CMVA320 filter 3 fmax 30 000 CPM pk pk reading ny o E Bs 10 330 20 2 25 Ea o 5 a m e o Es D 4 03 Ly c lt lt 2 o o 0 1 0 03 10 100 1000 Shaft Diameter mm Figure A 1 Enveloped Acceleration Alarm Guidelines Fmax 60 000 CPM To utilize the above chart the following parameters must be known Bearing bore diameter in mm indicates load Shaft speed in RPM Assumptions for using the above chart are necessary as deviations from standardized data collection greatly affect enveloped acceleration readings Assumptions are as follows Filter 3 500 10 000 Hz e Fmax 60 000 CPM 1 000 Hz gt A scaling factor is required for other Fmax values A scaling equation is provided in Part II Sensor CMSS793 or CMSS797 or MCD probe Detection Peak to Peak Mechanical Condition Transmitter MCT A 5 User Manual General Severity Level Guidelines Vibration Enveloped Acceleration Measurements Perform measurements with the machine operating under normal conditions For example when the r
8. ble lengths longerthan _ 30 m00 feet Ve Alarm Reset Extension cabeor l ed Trip Multiply multi core 4 External meter connections OK Relay Output L lt Alert Danger Relay Output Power supply 24 V Power supply GND 4 20 mA Output for PLC DCS here converted to 1 to 5 Vdc with 250 Ohm resistor Machine Condition Transmitter MCT 2 1 User Manual Installing the Machine Condition Transmitter Opening the Case Opening the Case Opening the MCT case is best done with a small flat blade screwdriver On transmitters linch 26 mm wide units insert the tip ofthe screwdriver between the right side cover as viewed from the front ofthe unit and the DIN rail mounting foot at the back of the unit as shown in Figure 2 1 and gently leverage the blade to begin separating the cover from the rest of the unit Carefully work your way around to the front of the unit to complete removal of the cover exposing the circuit board components Insert blade at the back of the unit Figure 2 1 Blade Insertion Point on Transmitter On Monitors 1 6 inch 41 mm wide units you must first carefully separate the two halves of the unit at the center see Figure 2 2 The sides do not need to be removed This is done by working the screwdriver around the middle of the unit in the same general manner described above Machine Condition Transmitter MCT
9. c model number on the side label This number is the transducer sensitivity in either mV g or mV IPS see Table 1 5 below Type I D Transducer Type Sensitivity 100A low impedance constant current mV g powered accelerometer 100V low impedance constant current mV IPS powered velocity sensor 500E self generating electro mechanical mV IPS velocity sensor 1 16 Table 1 7 Identifying Transducer Type and Sensitivity For example 100A indicates the transducer is a 100 mV g low impedance accelerometer Other sensitivities are available by special order Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Transducer The enveloped acceleration transmitter unit always uses a 100 mV g low impedance constant current powered accelerometer Transducer Cable The MCT provides power for the transducer via a nominal 4 4 mA constant current source This is generally enough current to allow operation with transducer cables extending up to about 100 ft Longer cables may be used depending on the sensor and cable specifications However it is strongly recommended that the transmitter monitor be mounted as close as practical to the associated transducer This will prevent signal distortion associated with current drive limitations and will minimize interference from external electro magnetic noise sources EMI A well shielded properly installed transduce
10. ct detection by means of the enveloping technique are needed to classify the machine condition according to standards and practical guidelines For enveloped acceleration in all forms severity levels are related to speed and bearing size The bearing size is generally related to the load capabilities of the machine General Severity Level Guidelines Vibration Enveloped Acceleration Measurements The higher the speed the higher the energy generated by impacts as elements roll over bearing damage The relation Maximum shaft speed times shaft diameter has a maximum depending on the bearing technology Notice that for bigger bearings the speed is limited and therefore the severity levels are also limited Carefully select the severity levels for enveloped acceleration using machine knowledge Sensor location and sensor installation is important for successful machine monitoring The boundaries between different states of severity conditions are less defined Comparative and relative judgement methods are preferred above absolute judgement and the application of standards For creating a comparative measurement the process control system is able to create a trend of the vibration signal This signal can be compared against a baseline overall measurement of that measurement point with the knowledge that the machine 1s running under normal conditions In many cases periodic measurements have been performed on equipment before
11. ctory preset to 10 gE The Filter option is set to Filter 3 500 Hz to 10 Hz unless otherwise specified in the model number In the tables above indicates the factory preset range Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Full Scale Range Jumper Locations Setting Jumper Configuration Range Settings E2 E2 E3 0 to 0 5 IPS or 12 5 mm sec E4 Option 01 E2 E3 E3 0 to 1 0 IPS or 25 0 mm sec factory preset E4 Option 02 E2 E2 and E3 E3 0 to 1 5 IPS or 37 5 mm sec E4 9 Q9 Option 03 E2 E3 and E4 E3 0 to 2 0 IPS or 50 0 mm sec E4 Option 04 2 E3 and E4 and E5 0 to 2 5 IPS or 62 5 mm sec Es option 05 Special Filters El Remove to install Filter 1 ES Remove to install Filter 2 Table 1 4 MCT Velocity Options Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Full Scale Range MCT Vel Peak u ee I 8 pin Connertoc 71 lle Ribbon Cable lt 9 5 e MI gt Optional Fater 4 Jumper El amp ES a 3 9 Range Jumpers 4 o E2 E3 md E4 m ze Que oe b FOR er z Sie d u Figure 1 6 MCT Velocity Peak Detection Jumper Locations 1 10 Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Full Scale Range MCT Vel RMS PCBoard tates o o lo zi S z ia E pin Co
12. ded Peak to Peak Measurements with the Microlog Acceleration and Enveloped Acceleration The buffered vibration output is used as an input signal to the Microlog The selected enveloped acceleration filter setting for the Microlog must be equal to the filter choice on the enveloped acceleration transmitter The maximum frequency must be set at twice the value of the selected low corner cut off frequency of the enveloped acceleration filter for example filter 500 Hz to 10 kHz results in a maximum analyzing frequency of 1 kHz Peak to Peak readings on the Microlog can be compared to the Peak reading of the MCT module This difference of detection method is based upon the fact that the Microlog Machine Condition Transmitter MCT User Manual Installing the Machine Condition Transmitter Interfacing the MCT with Other Monitoring Systems has an AC coupled signal processing path while the MCT modules use a dc coupling RMS Measurements with the Microlog Acceleration and Velocity The buffered vibration output is used as an input to the Microlog The Microlog s frequency settings must be equal to the filter bandwidth settings of the Velocity MCT CMSS530 module The detection method must be set to RMS Important The MCT VEL module uses an analog filter and integrator which measure continuously The Multilog and Microlog calculate the RMS value from the spectrum which is not continuously processed This discontinuity which
13. des a transducer OK relay contact and a trip multiply function Tx Trip multiply allows the alarm levels to be temporarily increased by a factor of two or three to avoid false alarms for example during the start up phase of a machine Machine Condition Transmitter MCT 1 3 User Manual Machine Condition Transmitter MCT The MCT Monitor ACC Signal Power ACC Signal GND Buffered Vibration GND Buffered Vibration Output Power supply 24 V Power GND 4 20 mA GND 4 20 mA Output Figure 1 3 MCT Transmitter General Pin Assignment Trip Multiply Terminal Reset Alarm Reset Trip Multiply Common Alarm Common Trip Multiply Terminal OK Relay Output N O OK Relay Ouput N C OK Relay Output OK Figure 1 4 MCT Transmitter Monitor General Pin Assignment 1 4 Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Identification Label Ed Too an avt V3 oSogq UVS E s og ur pn 10600070V diroopo4 add LIW APHRUSUDLL UOWIPUOD PYPE ZH3 I 02H OF Auxilary Power Output 20 Vdc at 20 mA max Auxilary Common Alert N C Alert Common Jaw oor OST AH FOOTFOFSSSHLD ON Tapora Alert N O Analog Current Vibration Output 0 5 V Danger N C Alert Set Point 0 5 V Danger Common Danger Set Point 0 5 V Supoguopi WORIDUO TTS ooooooQ Danger N O Sensor Bias Voltage Figure 1 5 MCT Transmitter Monitor Top a
14. e with portable monitoring equipment such as the SKF Reliability Systems Microlog Mechanical Condition Transmitter MCT 1 1 User Manual Machine Condition Transmitter MCT The MCT Transmitter Figure 1 1 The MCT Transmitter Figure 1 2 The MCT Transmitter Monitor 1 2 Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT The MCT Monitor The MCT Monitor CMSS530 Velocity Transmitter without Monitor CMSS530A Velocity Transmitter with Monitor CMSSS590 Enveloped Acceleration Transmitter without Monitor CMSS90A Enveloped Acceleration Transmitter with Monitor Table 1 1 MCT Module Configurations MCT modules can be ordered as stand alone Monitors by adding the suffix A to the basic model number i e CMSS530A and CMSS590A When ordered as a stand alone monitor the unit includes an alarm module front panel and an output relay that can be jumper configured for either latching or non latching operation The ALERT or DANGER LED will turn ON and the corresponding relay will actuate whenever overall vibration levels exceed the corresponding setpoint for more than a preset delay time jumper selectable The alarm module has a front panel accessible BNC connector and associated selector switch for reading the analog current vibration level CV or alarm setpoints A or D with a standard digital voltmeter The alarm module also provi
15. ect the other modules 1 14 Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Powering the MCT ojojo mains PEN L o GND POWER SUPPLY MAINS INPUT 24 V Note The MCT CMSS590 Enveloped Acceleration module has jumpers available to disconnect sensor power Therefore only the Enveloper module can be the slave Cable shield connected to sensor casing Sensor must be grounded Insulate shield at transmitter side Optional Alternative Cable shield connected to instrument ground Insulate shield at sensor end Figure 1 9 Typical Power Wiring Configuration Machine Condition Transmitter MCT 1 15 User Manual Machine Condition Transmitter MCT Transducer Grounding When experiencing interference on the output signals due to common ground connections it is recommended to connect the 24 V GND at the power distribution terminals to the protective ground PE gt For CE approved systems it is recommended to use shielded twisted pair cables for all signal connections Except for the sensor signal for example accelerometer all shields must be connected to PE Transducer The velocity transmitter unit is factory configured for use with one of three transducer types The specific type is identified by four digits for example 100A immediately following the basi
16. eliability Systems analyzing products that use digital signal processing i e Microlog Multilog Mechanical Condition Transmitter MCT 2 11 Installing the Machine Condition Transmitter Interfacing the MCT with Other Monitoring Systems 2 12 CMMA320 and Monitor Interface Module MIM CMMA162 MCT modules use analog signal processing techniques so be careful when comparing results with digital instruments For enveloped acceleration gE applications the filter ranges in the Microlog and Multilog are equal but the filter range of the enveloper circuitry in the Vib Pen Plus is fixed between 5 kHz and 10 kHz to obtain a general bandwidth where low frequency influences due to hand held operation are eliminated Detection methods of the Microlog and Multilog are in general based upon detecting a maximum and minimum peak value within the whole time period of the measurement From this peak to peak value the zero peak value is calculated The RMS value is always derived from the calculated spectrum and is not a true RMS conversion on the dynamic time signal unlike the MCT modules Furthermore MCT modules use averaging methods to prevent unwanted fluctuations The number of averages for the Multilog and Microlog are free selectable It is advised to select 4 to 8 averages to create a comparable total measurement time period Guidelines for using the Microlog as an analysis instrument in combination with the MCT modules are provi
17. g alarm settings is to trend vibration readings over time establish baseline values and alarm settings above baseline values Vibration measured in Velocity For vibration velocity ISO standards such as ISO 10816 First Edition 1995 or VDI 2056 guidelines are generally accepted ISO 10816 with the title Mechanical vibration Evaluation of machine vibration by measurements on non rotating parts consists of six parts Part 1 10816 1 determines general guidelines and is followed by the additional parts of ISO 10816 for example Part 2 10816 2 for land based steam turbines and generators in excess of 50 MW with normal operating speeds of 1500 RPM 1800 RPM 3000 RPM and 3600 RPM The following severity chart is in accordance with the ISO 10816 2 guidelines For exceptions to this guideline and for more information reference the ISO 10816 2 document Machine Condition Transmitter MCT A 1 User Manual General Severity Level Guidelines Vibration measured in Velocity ISO 10816 2 Steam Turbines and Generators Speed RPM Velocity mm sec RMS 1500 or 1800 3000 or 3600 11 8 10 0 8 5 7 5 5 3 s Unrestricted Operation 2 8 ui Newly Commissioned 0 0 Machinery Table A 1 Vibration Severity Chart ISO 10816 2 Industrial machines with nominal power above 15 kW and nominal speeds between 120 RPM and 15000 RPM when measu
18. igh pass filter 50 Hz L1 5 Low pass filter 1 5 KHz The unique serial number identifies individual transmitters and is used for warranty quality control and service purposes The label also has the CSA and CE approval marks Full Scale Range Preset Options The MCT comes factory with the most common full scale range Other ranges may be implemented by installing jumpers as shown in Tables 1 2 and 1 3 See Opening the Case in Chapter 2 for information on gaining access to jumpers Changing ranges by jumper selection only will introduce an additional error of 5 typical 2 max For greater accuracy the system range must be re calibrated Machine Condition Transmitter MCT 1 7 User Manual Machine Condition Transmitter MCT Full Scale Range Full Scale Range English Metric Jumper 01 5 IPS 12 5 mm sec E2 02 1 0 IPS 25 mm sec E3 03 1 5 IPS 37 5 mm sec E2and E3 04 2 0 IPS 50 mm sec E3 and E4 05 2 5 IPS 62 5 mm sec E2 and E3 and E4 Table 1 2 MCT VEL Full scale option for all velocity transmitter units 1s factory preset to 02 for 0 to 1 0 IPS or to 25 0 mm sec if not otherwise specified in the model number Range Full Jumper Scale 01 10 gE E8 02 30 gE E9 03 80 gE E10 Table 1 3 MCT ENV Full scale option for all enveloped acceleration transmitter units is fa
19. nd Bottom Pluggable Terminals Both monitors and transmitters mount on standard DIN rail gt For more information concerning the alarm settings reference Setting Monitor Alarms in Chapter 2 Identification Label An identification label on the right side of the module provides information about the module type including a unique model number identifying data of the module s basic configuration such as the factory configured sensor type the measurement method and the installed filter characteristics For example Machine Condition Transmitter MCT 1 5 User Manual Machine Condition Transmitter MCT Identification Label Standard Units CMSS530A100A ER ISO 100 mV g Velocity Input Transmitter Sensitivity A with Monitor Without Monitor E English IPS RMS Detection M Metric mm sec RMS Detection ISO Standard 10 Hz to 1 KHz ISOLF Low Frequency 2 Hz to 2 KHz CMSS590A100A 100 mV g Enveloped Input Acceleration Sensitivity Transmitter A with Monitor Without Monitor gt Each enveloped acceleration transmitter provides three band pass filters Reference Table 2 1 for details Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Full Scale Range Special Units CAST 00V EOS3P H50L 1 5 x mV IPS ma Velocity Transmitter Transducer A with Monitor Without Monitor E English IPS 03 Full Scale Option 3 P Peak Detection H50 H
20. ning the Case Setting Monitor Alarms Interfacing the MCT with Other Monitoring Systems General Severity Level Guidelines Vibration measured in Velocity Vibration Enveloped Acceleration Measurements Index Machine Condition Transmitter MCT User Manual ONNANDABWeR SS ee A 1 A 3 TOC 1 1 Machine Condition Transmitter MCT SKF Reliability Systems Machine Condition Transmitter MCT modules are compact rail mounted devices that convert part ofa wide band input signal to a signal proportional to machine vibration The MCT Transmitter There are two MCT versions CMSS530 is a 4 20 mA velocity transmitter and CMSS590 is an enveloped acceleration transmitter Each is factory configured for use with a low impedance accelerometer The velocity transmitter can also be configured for use with a low impedance velocity sensor or electro mechanical velocity sensor The sensor input signal is processed to determine its overall vibration level in terms of either velocity RMS or Peak or enveloped acceleration Output is a standard 4 20 mA current proportional to this level within a specified full range such as 0 1 IPS RMS for velocity or 0 10 gE for enveloped acceleration The 4 20 mA output is suitable for a direct connection to a Programmable Logic Controller PLC or Distributed Control System DCS A BNC connector on the front of the unit provides access to the buffered transducer signal for us
21. nveloped Acceleration Measurements The definition for an alarm condition for the enveloped acceleration transmitter module also depends on the application Alarms can be a warning that a certain condition has occurred and that further analysis 1s required Based upon those results a decision must be made on further required actions The MCT is then used as a monitoring device The alarm condition can also be used to take direct action In this case the MCT module is fulfilling a protective task together with the process control relay system gt The software CMSW5000 Atlas For Windows features a calculator for enveloped acceleration alarm settings and is based on identical assumptions Mechanical Condition Transmitter MCT A 7 User Manual General Severity Level Guidelines Vibration Enveloped Acceleration Measurements gt For more information please visit our website www skfcm com select News and download Revolution 6 Number 2 with the complete article General Alarm Guidelines for Enveloped Acceleration Measurements Machine Condition Transmitter MCT User Manual Index 4 4 20 mA 1 1 4 20 mA Output 1 13 A Alarm Delays 2 8 Alarm Relays 2 10 Alarm Setpoints 2 6 B band pass filters 2 5 BNC connector 1 3 1 14 2 6 BOV 1 14 Buffered Output 1 14 C CMSS530 1 1 CMSS590 1 1 COM terminal 2 9 corner frequency 2 4 Machine Condition Transmitter MCT User Manual D dc power 1 8 E E
22. nzector P1 iu e ol Ribon Cable weil m jjo o 9 A M Pr el P Options Fiter 2 Jumper E mije ej m o 5 ey Rage Junger E2 E3 and E4 m i j 6 o alle ol Z o Sig orinar CaO Janper E5 re Zee a B u Te Figure 1 7 MCT Velocity RMS Detection Jumper Locations Machine Condition Transmitter MCT 1 11 User Manual Machine Condition Transmitter MCT Full Scale Range Setting Jumper Configuration Constant Current Source E1 6 Provides constant current factory preset No current supply uses buffered output as signal input Selectable Filterbands E2 ENV Filter 4 5 kHz to 40 kHz ES oo E3 66 ENV Filter 3 500 Hz to 10 KHz factory preset E6 6 factory preset E4 ENV Filter 2 50 Hz to 1 0 kHz E7 Range Settings E8 66 Range 1 0 to 10 gE factory preset E9 Range 2 0 to 30 gE E10 Range 3 0 to 80 gE Table 1 5 MCT Enveloped Acceleration Options 1 12 Machine Condition Transmitter MCT User Manual Machine Condition Transmitter MCT Powering the MCT 8 gai Cornector Ji Ribbon Cable Range Juenpers p E3 EF and E10 z rs m o z a E19 Constant Current Fiter selection Jumper E4 amp E 1 Source Jumper El foc Fiter 2 50 Hz to 1 kHz A SONG n u O gr Figure 1 8 MCT Enveloped Acceleration Jumper Location
23. otor and the main bearings have reached their normal steady operating temperatures and with the machine running under its normal rated condition at rated voltage flow pressure and load To obtain the most accurate readings enveloped acceleration measurements require probe placement in the maximum load zone or as close as possible to the maximum load zone within the measured bearing or gear box Example Bearing bore diameter 100 mm Shaft speed 1800 RPM Fmax 60 000 CPM Use the chart in Figure A 1 to determine this enveloped acceleration measurement s alert and danger alarm settings Locate 100 mm on the shaft diameter axis Follow the vertical line representing 100 mm to the point where it intersects the 1800 RPM running speed line This is your reference point From your reference point follow the horizontal lines left to the danger settings axis to determine your initial danger alarm setting 7 5 gE From your reference point follow the horizontal lines right to the alert settings axis to determine your initial alert alarm setting 2 5 gE Use the Scaling Factor chart Figure A 2 A 6 Machine Condition Transmitter MCT User Manual General Severity Level Guidelines Vibration Enveloped Acceleration Measurements 1 40 1 20 So Q9 1 00 o iL 0 80 o SE 0 60 E o 0 40 0 20 0 00 0 500 1000 1500 2000 Fmax Hz Figure A 2 Scaling Factor for Fmax Compensation for E
24. r cable is necessary to obtain reliable operation Shielded twisted pair cables designed and pre fitted with the proper transducer connector or sensors with integral cable which are sold for this specific purpose are recommended The cable shield should be open at the transmitter end and connected to ground through the sensor casing Alternatively the cable shield could be open at the transmitter end and connected to common xder terminal at the transmitter monitor input only Transducer OK Circuit The MCT incorporates a transducer OK circuit This feature continuously monitors the transducer bias and signal voltage If this voltage exceeds preset limits the 4 20 mA output current is reduced to less than 2 mA typically 0 mA to allow detection of the fault condition at the associated PLC or DCS system A green OK LED on the front of the unit normally ON in an OK condition turns OFF to provide a local indication of the fault condition For low impedance constant current powered transducers this circuit will effectively detect open shorted or reversed transducer connections When a Machine Condition Transmitter MCT 1 17 User Manual Machine Condition Transmitter MCT Output 1 18 detected fault is remedied a delay of approximately 30 seconds occurs before the unit returns to the OK condition and the OK LED turns back ON A detected fault will also disable the ALERT and DANGER alarms relays until the fault is
25. red in position are covered by ISO 10816 3 The machines are separated into 4 different groups Group 1 Large machinery and electrical machines with shaft height greater than 315 mm that are normally equipped with sleeve bearings Group 2 Medium size machines and electrical machines with shaft height between 160 mm and 315 mm that are normally equipped with rolling element bearings and operate at speeds above 600 RPM Group 3 Pumps with multivane impellers and separate drivers with rated power above 15 kW Machines of this Machine Condition Transmitter MCT User Manual General Severity Level Guidelines Vibration Enveloped Acceleration Measurements group may be equipped with sleeve or rolling element bearings Group 4 Pumps with multivane impellers and with integrated drivers that are equipped with sleeve or rolling element bearings ISO 10816 3 Machinery Group Machinery Group 2 amp 4 1 amp 3 Rated Power 15 kW 300 kW Group 1 300 kW 50 MW Group 3 above 15 kW Velocity mm sec RMS 11 0 7 1 4 5 Restricted Operation 3 5 2 8 Unrestricted Operation 2 3 1 4 0 7 Newly Commissioned Machinery 0 0 Foundation Rigid Flexible Rigid Flexible Table A 2 Vibration Severity Chart ISO 10816 3 Vibration Enveloped Acceleration Measurements Mechanical Condition Transmitter MCT User Manual Severity levels for machine vibration and bearing defe
26. s Powering the MCT The MCT requires externally supplied dc power The selected power supply should have a nominal output of 24 Vdc and be capable of supplying minimum currents noted in Table 1 4 Machine Condition Transmitter MCT 1 13 User Manual Machine Condition Transmitter MCT Powering the MCT Model Minimum Power Number Supply Unit CMSS530 55 mA CMSS530A 110 mA CMSS590 75 mA CMSS590A 125 mA Table 1 6 MCT Minimum Currents A regulated power supply dedicated to the vibration monitoring system is recommended It is also recommended that connections between the power supply and the transmitter monitors be made with shielded twisted instrument cable The cable shield should float at the transmitter monitor and connect to ground at the power supply system common end only The MCT regulates dc power internally to prevent a fault on the output of one channel from affecting other channels When power is first applied to a transmitter monitor after connecting the transducer a delay of approximately 30 seconds will occur before the OK LED turns ON Power Supply Distribution If more than one MCT module is installed terminal blocks for power and ground must be used From these terminal blocks 24 Vdc power is distributed to each individual module It is recommended to use individual fuse terminals for each positive supply line so a power failure in a single MCT module will not aff
27. s for process control systems are the static output 4 20 mA dc and the low power change over relay contacts The maximum load resistance of all connected instruments in the current loop is 500 Ohms Reference the section 4 20 mA Output in Chapter 1 for more information Interfacing to SKF Reliability Systems Products Consider the following interface options Machine Condition Transmitter MCT User Manual OFF LINE Loc Sur 86 Installing the Machine Condition Transmitter Interfacing the MCT with Other Monitoring Systems Use SKF Reliability Systems equipment to analyze MCT module readings Use MCT modules as a front end to on line condition monitoring equipment Figure 2 6 shows a combination of the above mentioned interface options Cable shield connected to sensor casing Sensor Sensor must be grounded Insulate sheld at transmitter side Multilog LOCAL MONITOR UNIT CMMA 320 INPUT 1 GND INPUT 1 SIGNAL Buffered Vibration Output MONITORING Use shielded twisted pair cable for connection between transmitter and analyzing equipment or Q ON LINE VEL User Manual Microlog PROCESS CONTROL SYSTEM CMVA 60 DCS PLC Input Resistor 1 to 5 Volt DC Power supply 24 V R 250 Ohm Power supply GND OPTIONAL AMPLEIER Figure 2 6 MCT CMSS530 590 Interfacing Analyzing MCT Readings Unlike other SKF R
28. t 1 second the associated relay will de energize and the alarm LED will turn off The alarms can also be set for latching operation by installing shunts on jumpers El and E2 on the Alarm module circuit board Latched alarms may be reset by closing the RESET RST and COMMON COM contacts at the top of the unit This may be done with an external switch dry contact relay or by shorting the terminals together by hand 2 8 Machine Condition Transmitter MCT User Manual Installing the Machine Condition Transmitter Setting Monitor Alarms Important Do not apply voltage to either the RST or COM terminals gt Ifseveral monitors are mounted together the RST terminals may be daisy chained together and switched to COM system common as a group Trip Multiply The alarm module provides a trip multiply feature This feature allows the user to temporarily double standard or triple jumper selectable the normal setpoints during periods of normal high vibration such as start ups To actuate the trip multiply feature the Tx terminal at the top of the alarm module must be closed to the adjacent COM terminal This may be done with an external switch dry contact relay or by shorting the terminals together by hand Important Do not apply voltage to either the Tx or COM terminals gt Ifseveral monitors are mounted together the Tx terminals may be daisy chained together and switched to COM system common as a group Alarm Rela
29. t extend to units that have been misused altered or repaired without manufacturer s authorization Defects or failures experienced during the warranty period will be corrected at no charge at the manufacturer s facility If upon examination it is found that the defect is not within the scope of this warranty an estimate of repair charges and a request for authorization to proceed with repair will be submitted along with a statement of the reasons the repairs are not considered to be covered by the warranty This warranty does not extend to system components such as transducers drivers and cable assemblies manufactured by others Warranty for these components will be their manufacturer s standard Manufacturer s liability under this warranty is limited to repair or replacement of any defective instrument at the discretion of the manufacturer In the event that any of the above limitations are held unenforceable our liability to you shall not exceed the license fee you paid regardless of the form of any claim Because of the extreme diversity of ways that the product can be used you are advised to test the product thoroughly for your purposes before relying on it Contents Machine Condition Transmitter MCT The MCT Transmitter The MCT Monitor Identification Label Full Scale Range Powering the MCT Transducer Output User Manual Installing the Machine Condition Transmitter MCT Typical Installation Ope
30. ter Settings gt The factory preset for the enveloped acceleration transmitter module is Filter 3 500 to 10 000Hz Use the following guideline to define the proper band pass for the application The low frequency roll off of the band pass filter to eliminate rotational components is Fmin gt 10 x RPM 60 Setting Monitor Alarms gt This section applies only to the Monitor units CMSS530A and CMSS5904A 2 4 Machine Condition Transmitter MCT User Manual Vibration Buffered Output BNC Sensor OK LED Installing the Machine Condition Transmitter Setting Monitor Alarms gt Fora brief overview of vibration severity levels reference the General Severity Level Guidelines appendix BANGER Alarm LED CV Analog current Vibration Output 0 5 V I Monitor BNC A Alarm Set Point 0 5 V D Danger Set Point 0 5 V Selector Switch DC Sensor Bias Voltage Danger Set Point Potentiometer r Alert Set Point Potentiometer ALERT Alarm LED Figure 2 3 MCT Front View With Monitor Options Explained Alert and Danger Alarm Setpoint Adjustment ALERT and DANGER alarm setpoints can be independently set in the field by turning the front panel selector switch to the associated position A or D and adjusting the associated front panel potentiometer until the correct dc voltage is measured at BNC connector located directly above the selector switch Adjusting the setpoint requires the use of
31. the following equation Units of Vibration _ x Measured Voltage 1 Example Measured Voltage 3V Full Scale 0 5 IPS 0 5 IPS V Converted Output Reading x BV 1 0 25 IPS Buffered Output The MCT provides access to the buffered transducer signal using a BNC connector on the front of the unit and on a screw terminal at the top of the unit These buffered outputs have the same sensitivities units and bias voltages as the transducer itself i e mV g for an accelerometer or mV IPS for a velocity transducer This output can be connected to portable monitoring equipment or analyzers i e SKF Reliability Systems Microlog or can be used to check the bias output voltage BOV of low impedance transducers using a digital voltmeter The buffered output is unfiltered gt For electro mechanical velocity transducers only The buffered output sensitivity is scaled to 100 mV IPS regardless of the actual input sensitivity For example a 145 mV IPS transducer will have a scaled buffered output sensitivity of 100 mV IPS Machine Condition Transmitter MCT 1 19 User Manual Machine Condition Transmitter MCT User Manual User Manual 1 20 Machine Condition Transmitter MCT User Manual 2 Installing the Machine Condition Transmitter MCT Typical Installation TYPICAL INSTALLATION Sensor Part Number CMSS2100 example Cable shielded twisted pair 30 m 100 feet Junction box for ca
32. y jumpers to the proper position Setting Jumper Configuration Alert Time Delay El 0 1 sec E2 1sec E3 3 sec factory preset E4 6 sec ES 10 sec Danger Time Delay E6 0 1 sec E7 lsec E8 3 sec factory preset E9 6 sec E10 10sec Latching Non latching Alarms E11 Open Alert Non latching factory preset OS Closed Alert Latching E12 Open Danger Non latching factory preset 6 Closed Danger Latching Trip Multiply factor E13 Open factor 2x factory preset OKO Closed factor 3x Table 2 2 Monitor Jumper Options Mechanical Condition Transmitter MCT 2 7 User Manual Installing the Machine Condition Transmitter Setting Monitor Alarms p JUMPER INSTALLED LATOHING IRI MULTIPLY ARPER RONIVED NON LATONIN R JuMP 3X LATCH ERT I LATCH J i PUT 90999H i a 3 zu 290 9 13 ey 312630323 97 ji nnd ALERT DELAY Cl 4 SEC ER 1 SEC E3 3 SEC 4 6 SEC DANGER DELAY ES 10 SEC E 4 SE E7 1 SEC EB 3 SEC ES SEC E10 10 SEC Figure 2 5 Monitor Jumper Locations Latching Non latching Alarms The Alert and Danger alarms are factory set for non latching operation This means that whenever the vibration level drops below the associated setpoint for more than abou
33. ys The ALERT DANGER and OK relays are independent single pole double throw relays NO ARM and NC contacts are available through a plugable screw connector at the bottom of the monitor OK relay contacts are available on fixed screw terminals at the bottom front of the alarm module Relay contacts are rated 5 Amps at 30 Vdc or 125 Vac resistive load This rating includes any inrush current the load draws For loads that are not purely resistive the contact switching capability needs to be considered carefully in terms of this inrush current and rated accordingly Mechanical Condition Transmitter MCT 2 9 User Manual Installing the Machine Condition Transmitter Interfacing the MCT with Other Monitoring Systems 2 10 gt The user is reminded to take care when applying relays The factory intended purpose of providing relay contacts is to operate relatively low power alarm annunciators act as a dry or low dc voltage contact closure input to other systems or act to actuate an appropriately sized slave relay for larger loads such as shutting down a motor Relays are socketed and can be replaced Rated Amps Voltage 5A 30 Vdc 5A 125 Vac 2 5A 250 Vac Table 2 3 Relay Contacts Rating Interfacing the MCT with Other Monitoring Systems The MCT CMSS530 and CMSS590 modules interface with equipment used for process control and data analysis Interfacing to Process Control Systems Interface option
Download Pdf Manuals
Related Search