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Related Manuals for MMF M12
Summary of Contents for MMF M12
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Page 1: Instruction Manual
Instruction Manual Universal Vibration Monitor Version C Manfred Weber Metra Mess- und Frequenztechnik in Radebeul e.K. Meissner Str. 58 - D-01445 Radebeul / Germany Phone +49-351 849 21 04 Fax +49-351 849 21 69 Email: Info@MMF.de Internet: www.MMF.de... - Page 2 Metra Mess- und Frequenztechnik in Radebeul e.K. Meißner Str. 58 D-01445 Radebeul / Germany Tel. +49-351-836 2191 +49-351-836 2940 Email Info@MMF.de Internet www.MMF.de Notice: The latest version of this manual can be found at http://www.mmf.de/produktliteratur.htm © 2017 Manfred Weber Metra Mess- und Frequenztechnik in Radebeul e.K.
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Page 3: Table Of Contents
Power-on Alarm Delay..............14 4.2.3. Sensor....................15 Sensor Input..................15 Sensitivity Adjustment..............15 Sensor Status Indication..............15 Sensor Connection................17 Operation of Two M12 Modules with One Sensor......17 4.2.4. Selecting a Vibration Quantity..............18 Dynamic Range of the Integrators..........19 RMS / Peak-to-Peak..............19 Response time................19 4.2.5. Selecting the Measuring Range.............20 Overload Indication..............20... - Page 4 LED Backlighting.................29 Mounting..................30 Calibration..................30 5. Measuring Methods for Machine Vibration..........31 5.1. Vibration Severity Measurement for Unbalance...........31 ISO 10816-1.................31 Measurement with the M12............32 5.2. Vibration Measurement on Reciprocating Engines........33 DIN/ISO 10816-6.................33 Measurement with the M12............34 5.3. Bearing Monitoring..................34 General..................34 Crest Factor...................34 Diagnostic Coefficient..............35...
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Page 5: The M12 At A Glance
1.The M12 at a Glance Front View: rear terminals relay outputs N.C. N.O. front terminals 4-20 mA loop / AC output +I Out -I Out AC Out LED bargraph display for monitored quantity and alarm threshold LEDs for alarm, sensor condition and overload... -
Page 6: Purpose
Thus the M12 can reduce cost caused by production loss and unnecessary re- pairs. The M12 can also be used for many tasks in process and quality control. Its flexible design makes it easy to adapt the M12 for any monitoring application. -
Page 7: Function
At the side wall of the instrument a potentiometer for trans- ducer sensitivity fine tuning can be found. The adjustable range is 10 to 100 mV/g. The M12 has 3 gain ranges which can be selected by the DIP switches nos. 2, 3 and 4 at the side... -
Page 8: Filters
In addition to its analog outputs, the M12 features a relay out- Alarm Relay put which can be used to trigger external events when the ad- justed threshold is exceeded. -
Page 9: Level Display
Alarm threshold Alarm on Alarm off Figure 2 : Alarm management The upper curve of the diagram represents a typical vibration signal over time. It can be RMS or peak-to-peak signals. The lower curve shows the relay response. At point the adjusted threshold was exceeded. Now the de- lay time t starts. -
Page 10: Self Test Functions
“Alarm” LED remains dark. Power supply failure also causes the relay contact to switch into the alarm position. In addition to the DC outputs, the M12 also provides a “raw” AC Output vibration signal. By means of Jumper 1 a selection can be... -
Page 11: Installation
4. Installation 4.1. Preparing Measuring Points Before making measurements, suitable measuring points on Sensor Location the machine need to be found. Experience in machine condi- tion maintenance is advantageous for selecting optimum spots. Dynamic forces are normally transmitted via bearings and their housings into the machine frame. -
Page 12: Iso 10816-1
The standard ISO 10816-1 recommends that vibration mea- surements on machines be made at the housing of bearings or nearby measuring points. ISO 10816-1 For routine monitoring it is sufficient in many cases to mea- sure vibration either in vertical or in horizontal direction. Rigidly mounted machines with horizontal shafts have their highest vibration levels mostly in a horizontal direction. -
Page 13: Installation And Adjustment
Figure 7: 4.2. Installation and Adjustment 4.2.1. Attachment The M12 is designed for 35 mm DIN rails which are mounted horizontally. It should be installed in a dry and dust protected environment, preferably in switch cabinets. To attach or release a module pull out the black lever on the top of the enclosure using a screw driver as shown in Figure 1. -
Page 14: Terminals
AC output settings: Chapter, 4.2.10, Page 25. 4.2.2. Power Supply The M12 requires for operation a DC supply voltage between 12 and 28 V which is usually available in switch cabinets. Well suited are industrial 24 VDC power supplies for DIN rail attachment. -
Page 15: Sensor
The ground potentials of the machine and the M12 are thereby separated. The M12 can detect sensor faults. This is achieved by moni- Sensor Status toring the bias voltage at the sensor output. Normal sensor Indication operation is indicated by the LED “OK”. -
Page 16: Sensor Connection
positive overload threshold of sensor monitoring: 20 V sensor bias voltage: typically 8 .. 12 V saturation voltage of the sensor: typically <1 V negative overload sensors Figure 11: Dynamic range and bias voltage of IEPE The accelerometer is connected via coaxial cable or multi- Sensor wire shielded cables. -
Page 17: Operation Of Two M12 Modules With One Sensor
Two M12 modules can be operated with one mutual sensor. In Operation of Two this way many useful applications are possible. M12 Modules Figure 13 shows, for example, a combination for monitoring with One Sensor vibration velocity and acceleration with one sensor. It can be used to measure unbalance and bearing noise simultaneously. -
Page 18: Selecting A Vibration Quantity
When one or both integra- of the Integrators tors are switched on, the dynamic range of the M12 will de- crease rapidly at frequencies of a few hundred Hertz (Figure 16). If double integration is selected, for example, the dy- namic range at 160 Hz will become only 10 % of full scale. -
Page 19: Dynamic Range Of The Integrators
Vibration velocity Vibration displacement Vibration acceleration single integration double integration no integration Dynamic range Acc. Vel. Displ. m/s² mm/s µm 2500 1000 Dynamic range for vibration displacement Dynamic range for vibration velocity Dynamic range for vibration acceleration Figure 16: Dynamic range of the integrators By means of the DIP switches nos. -
Page 20: Selecting The Measuring Range
They can be configured on site depending on the vibration signal. The M12 has two 8 pin sockets for a high pass and a low pass filter module. These filter modules are available as acces- sories. Metra offers the following versions: Low pass plug-in filter Model FB2: 0,1 kHz;... -
Page 21: Replacing Filter Modules
Figure 19: Location of filters and jumper J2 on the PCB The low pass filter is necessary for operation of the M12. The high pass filter can be omitted when a lower frequency limit of 1 Hz is desired. If no high pass filter module is plugged in, jumper J2 has to be in position “Off”... -
Page 22: Connection Of The Relay Output
Function ure of the power supply voltage will cause the relay to switch into alarm position. In this way the power supply of the M12 is monitored. Sensor Please note that a sensor failure will also cause the relay to... -
Page 23: Sensor Monitoring
The relay contacts are insulated from the circuit of the M12. Contact Rating They can carry up to 2 A at 40 VAC. If several M12 modules are in use, the relay outputs can be grouped by series connec- tion (AND function) or parallel connection (OR function). -
Page 24: Connection
Figure 23: 4-20 mA loop circuit Often the 24 VDC supply voltage of the M12 is also used as loop supply. The voltage at the terminals +I and -I must not exceed 30 VDC. Figure 24 shows the terminals of the 4-20 mA output... -
Page 25: Dc Outputs
4.2.9. DC Outputs The M12 features two DC outputs for the RMS and the peak- to-peak values of the selected vibration quantity (Figure 25). Both outputs are referred to ground (GND). Their voltage range is 0 to +10 V. N.C. - Page 26 Figure 26: Opening the case After removing the lid the back of the PCB becomes visible. Pull out the PCB carefully. The main PCB is connected via a ribbon cable with the front PCB. Prevent the front PCB from sliding out with your finger. Put the main PCB beside the case with its components facing towards you.
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Page 27: Output Level
(compare chapter 4.2.5) and the calibrated transducer sensitivity. The following table shows the output sensitivity for all measuring ranges and integrator options provided the M12 has been calibrated with its accelerometer (compare chapter 4.3, page 28). Measuring range AC Output 10 m/s²... -
Page 28: Calibration
4.3. Calibration Metra supplies the M12 calibrated with its sensor if the in- Factory strument is ordered together with a Metra accelerometer. If Calibration the M12 is ordered without transducer its default sensitivity calibration will be 100 mV/g. Factory calibration is only valid with unaltered transducer sensitivity adjustment. -
Page 29: Vibration Level Display M12Dis
4.4.Vibration Level Display M12DIS A useful option for the M12 is the display module M12DIS. It turns the M12 monitor into a vibration meter. Depending on the M12 settings it will display RMS or peak-to-peak values of vibration acceleration, velocity or displacement. Model M12DIS is a 3½... -
Page 30: Mounting
The display module is suitable for the attachment at front pan- Mounting els, switch boards, switch cabinet doors and other flat objects. For this purpose a mounting bezel is supplied with the M12DIS. The following pictures show the dimensions of the cut out and how the display is mounted. -
Page 31: Measuring Methods For Machine Vibration
The M12 must be calibrated before calibrating the display. The measuring range of the M12 must be selected so that the calibration signal provides at least 50 % of the full-scale level, for instance, use the range “10” if the calibration level is 10 mm/s. -
Page 32: Measurement With The M12
Measurement Vibration severity to DIN/ISO 10816 can be measured with the M12 in a simple way. A 10 Hz high pass filter and a 1 kHz with the M12 low pass filter are required. Vibration velocity is selected by DIP switch no. -
Page 33: Vibration Measurement On Reciprocating Engines
5.2.Vibration Measurement on Reciprocating Engines Reciprocating engines, like combustion engines and com- DIN/ISO 10816-6 pressors, are characterized by backward and forward going masses. The vibration generated by this motion, is higher than the vibration of rotating machinery. Standard ISO 10816-6 contains recommendations for the assessment of vi- brations of reciprocating machines. -
Page 34: Measurement With The M12
M12 ter. For each unit a 2 Hz high pass filter and a 1 kHz low pass filter are required. One M12 has to be adjusted for ac- celeration, the second one for velocity and the third for dis- placement. -
Page 35: Diagnostic Coefficient
Damage The two described methods of bearing monitoring can be ap- Measurement plied using one M12 module. A 1 kHz high pass and a 10 kHz with the M12 low pass filter are required. The high pass filter suppresses unbalance vibrations and lets only bearing noise pass. The 10 kHz low pass is recommended for suppressing the resonance peak of the accelerometer. -
Page 36: Technical Data
Multiplication and division have to be performed externally. Please note that the M12 measures the peak-to-peak value. It has to be divided by 2 to obtain the peak value â. 6. Technical Data Measuring ranges Vibration acceleration 10 / 50 / 250 m/s²... - Page 37 acceleration signal, û = ± 10 V Wide band output 1 Hz - > 50 kHz, impedance: 500 DC outputs 0 - 10 V RMS 0 - 10 V peak-to-peak LED (“OK”) and alarm relay Sensor status indication thresholds: <1 V and >20 V bias voltage LED (“OVL”) Overload indication at ±...
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Page 38: Declaration Of Ce Conformity
The repaired or replaced product will be sent back at Metra’s expense. Declaration of Conformity According to EMC Directive 2014/30/EC Product: Vibration Monitor Type: M12 Ver. C It is hereby certified that the above mentioned product complies with the demands pursuant to the following standards: DIN EN 61326-1: 2013...
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