MMF M12 Manuale utente

Instruction Manual

Manfred Weber

Metra Mess- und Frequenztechnik in Radebeul e.K.

Meissner Str. 58 - D- 1445 Radebeul / Germany

Phone +49-351 849 21 4 Fax +49-351 849 21 69

Email: Info@MMF.de Internet: www.MMF.de

Universal

Vibration

Monitor

M12

Version C

Published by:

Manfred Weber

Metra Mess- und Frequenztechnik in Radebeul e.K.

Meißner Str. 58

D-0 445 Radebeul / Germany

Tel. +49-35 -836 2 9

Fax +49-35 -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

May/ 7

Contents

. The M 2 at a Glance..................................................................................5

2. Purpose.......................................................................................................6

Measured Vibration Quantities.......................................................6

Outputs...........................................................................................6

Filters..............................................................................................6

LED Indicators...............................................................................6

3. Function......................................................................................................7

Sensor Input....................................................................................7

Amplifier.........................................................................................7

Filters..............................................................................................8

Integrators.......................................................................................8

RMS Rectification..........................................................................8

Peak-to-Peak Rectification..............................................................8

DC Outputs.....................................................................................8

4-20 mA Loop Output.....................................................................8

Alarm Relay....................................................................................8

Level Display..................................................................................9

Response time.................................................................................9

Self Test Functions........................................................................ 0

AC Output..................................................................................... 0

Overload Indication...................................................................... 0

Power Supply................................................................................ 0

Triple Insulation............................................................................ 0

4. Installation................................................................................................

4. . Preparing Measuring Points..........................................................................

Sensor Location............................................................................

ISO 08 6- ................................................................................. 2

4.2. Installation and Adjustment.......................................................................... 3

4.2. . Attachment............................................................................................ 3

Terminals...................................................................................... 4

4.2.2. Power Supply........................................................................................ 4

Power-on Alarm Delay.................................................................. 4

4.2.3. Sensor................................................................................................... 5

Sensor Input.................................................................................. 5

Sensitivity Adjustment.................................................................. 5

Sensor Status Indication................................................................ 5

Sensor Connection........................................................................ 7

Operation of Two M 2 Modules with One Sensor........................ 7

4.2.4. Selecting a Vibration Quantity.............................................................. 8

Dynamic Range of the Integrators................................................. 9

RMS / Peak-to-Peak..................................................................... 9

Response time............................................................................... 9

4.2.5. Selecting the Measuring Range.............................................................20

Overload Indication......................................................................20

4.2.6. Plug-in Filters.......................................................................................20

Slope.............................................................................................20

Factory Configuration...................................................................20

Replacing Filter Modules..............................................................2

4.2.7. Relay Output.........................................................................................22

Adjustments..................................................................................22

Connection of the Relay Output....................................................22

Self Test Function.........................................................................23

Sensor Monitoring........................................................................23

Contact Rating..............................................................................23

4.2.8. Current Loop 4-20 mA Output.............................................................23

Connection....................................................................................24

Insulation......................................................................................24

False Polarization.........................................................................24

4.2.9. DC Outputs...........................................................................................25

4.2. 0. AC Output...........................................................................................25

Filtering and Integration...............................................................25

Settings.........................................................................................25

Output Level.................................................................................27

Bandwidth.....................................................................................27

Connection....................................................................................27

4.3. Calibration....................................................................................................28

Factory Calibration.......................................................................28

Calibration Point...........................................................................28

Vibration Calibrator......................................................................28

Electrical Calibration....................................................................28

4.4. Vibration Level Display M 2DIS.................................................................29

Connection....................................................................................29

LED Backlighting.........................................................................29

Mounting......................................................................................30

Calibration....................................................................................30

5. Measuring Methods for Machine Vibration.............................................3

5. . Vibration Severity Measurement for Unbalance...........................................3

ISO 08 6- .................................................................................3

Measurement with the M 2..........................................................32

5.2. Vibration Measurement on Reciprocating Engines.......................................33

DIN/ISO 08 6-6.........................................................................33

Measurement with the M 2..........................................................34

5.3. Bearing Monitoring......................................................................................34

General.........................................................................................34

Crest Factor...................................................................................34

Diagnostic Coefficient..................................................................35

Measurement with the M 2..........................................................35

6. Technical Data..........................................................................................36

Appendix: Warranty

Declaration of CE Conformity

1.The M12 at a Glance

Front View:

AC Out-I Out+I Out

COM

+UsPK-PKRMS

-UsGNDInput

relay outputs

4-2 mA loop / AC output

RMS / peak-to-peak outputs

positive supply terminal

sensor input, signal ground

negative supply terminal

rear terminals

front terminals

N.C. N.O.

s %

LED bargraph display

for monitored quantity

and alarm threshold

Alarm OK OVL

LEDs for alarm,

sensor condition and overload

potentiometers for alarm delay

and alarm threshold

rear terminals

front terminals

Side View:

Adjustment of

transducer sensitivity

1 2 3 4 5 6 7 8 91

Function of the DIP switches

in their lower position

1: Sensor supply on

2: Range 1

3: Range 5

4: Range 25

5: Double integration (displacement)

6: Single integration (velocity)

7: Integration off (acceleration)

8: RMS monitoring

9: Peak-to-peak monitoring

1 : Alarm duration short

2.Purpose

The Universal Vibration Monitor is suitable for applications

where vibrations need to be monitored or measured. Typical

applications include condition monitoring of rotating machin-

ery to ISO 08 6 and bearing monitoring. The M 2 provides

information about the running condition of a machine.

Thereby it helps the maintenance engineer to predict wear in

time and to avoid unexpected breakdown. Thus the M 2 can

reduce cost caused by production loss and unnecessary re-

pairs. The M 2 can also be used for many tasks in process

and quality control.

Its flexible design makes it easy to adapt the M 2 for any

monitoring application. This can be of particular advantage if

no information about the vibration signal and its frequency

components is available before installation.

The M 2 provides standardized output signals for further pro-

cessing. A relay output for shut-off functions or alarm mes-

sages is also available.

Measured

Vibration

Quantities

The M 2 is designed for operation with an IEPE compatible

piezoelectric accelerometer. It can be used for measuring the

following quantities

• Vibration acceleration (without integration)

• Vibration velocity (single integration)

• Vibration displacement (with double integration)

For each vibration quantity among 3 measuring ranges can be

chosen.

Outputs The vibration signal is available at the following outputs:

• AC wide band output of amplified but unfiltered sensor

signal

• AC output of amplified, filtered and, if necessary, inte-

grated sensor signal

• DC output of true RMS for selected vibration quantity

• DC output of peak-to-peak value for selected vibration

quantity

• 4-20 mA current loop output of RMS or peak-to-peak

value for selected vibration quantity

Filters The use of replaceable filter modules makes the M 2 particu-

larly versatile. High pass and low pass frequencies can be se-

lected individually by means of an extensive range of avail-

able filter modules.

LED Indicators The following LED indicators can be found at the front panel:

• Alarm LED

• Sensor status LED

• Overload LED

• LED bar graph for monitored vibration quantity and

alarm threshold

3.Function

Figure : Block diagram

Sensor Input The M 2 requires for operation a piezoelectric accelerometer

with integrated electronics to IEPE standard. The instrument

is factory calibrated for standard industrial accelerometers

with 00 mV/g sensitivity, for example Models KS80 or

KS8 of Metra with protection grade IP67 and insulated case.

The constant current for the integrated sensor electronics is

supplied by the M 2 and can be activated by DIP switch .

Amplifier The amplifier with variable gain has over 50 kHz bandwidth.

At the side wall of the instrument a potentiometer for trans-

ducer sensitivity fine tuning can be found. The adjustable

range is 0 to 00 mV/g. The M 2 has 3 gain ranges which

can be selected by the DIP switches nos. 2, 3 and 4 at the side

wall as shown in the following table:

Vibration

acceleration

Vibration

velocity

Vibration

displacement

DIP 2 0 m/s² 0 mm/s 00 µm

DIP 3 50 m/s² 50 mm/s 500 µm

DIP 4 250 m/s² 250 mm/s 2500 µm

IEPE

Supply

Integrator

Highpass

2 poles

Plug-in

module

pk-pk

rms

AC Output

Integrator

pk-pk

rms

Transducer

Monitoring

Opto

Coupler

Loop Output

4-2 mA

Alarm

Threshold

Alarm

Delay

Alarm

Hold

Alarm

Relay Relay

Output

Alarm Threshold

(Front)

Dalay

(Front)

2/8 s

DC Output

rms

Bar

graph

Level

Alarm Threshold

Sensor OK

Alarm

Transd.

Fault

Overload LED

Overload

Comparator

DC Output

pk-pk

ICP

Transducer sensitivity

Output

Driver

Amplifier

filtered

unfiltered

Input

Stage

Lowpass

4 poles

Plug-in

module

Filters The M 2 contains separate high pass and low pass filters.

These filters are designed as plug-in modules. Thus they can

be replaced on site if necessary. The high pass filter has two

poles with an attenuation of about 40 dB/decade. The low

pass filter has four poles with about 70 dB/decade attenua-

tion.

Integrators For measuring vibration acceleration the M 2 is used without

integrators. When vibration velocity is measured, one integra-

tor is in the signal path. Vibration displacement requires dou-

ble integration. The integrators are switched on or off by the

DIP switches nos. 5 to 7.

RMS

Rectification

The instrument measures the true RMS value which ensures

high accuracy independently of the signal shape. The RMS

output is available via a 0 to 0 VDC output for external pro-

cessing. The RMS refresh rate is approx. value / second.

Peak-to-Peak

Rectification

Additionally, the peak-to-peak value of the selected vibration

quantity is measured. True peak-to-peak rectification ensures

high accuracy independently of the signal shape. The absolute

values of the highest positive and the lowest negative sample

of the last 00 ms are added. The peak-to-peak output is

available via a 0 to 0 VDC output for external processing.

The refresh rate is 00 ms.

DC Outputs Both RMS and peak-to-peak values are available simultane-

ously at two separate outputs. Only one of these signals, how-

ever, can be used for controlling the relay and the 4-20 mA

output. The monitoring mode is selected by the DIP switches

no. 8 (RMS) and 9 (Peak-to-peak).

4-20 mA Loop

Output

The RMS or peak-to-peak value of the selected vibration

quantity is available as 4-20 mA current loop signal. This cur-

rent loop output allows the transmission of analog signals

over long distances with inexpensive cables. At the destina-

tion the pre-processed vibration signal can be fed into PLCs,

panel meters, recorders or other 4-20 mA equipment.

A side effect of long distance signal transmission can be

ground loops. The accuracy of the M 2 will not be affected

by this phenomenon since the current loop output is optically

insulated from the rest of the circuit.

Alarm Relay In addition to its analog outputs, the M 2 features a relay out-

put which can be used to trigger external events when the ad-

justed threshold is exceeded. Possible devices to be connected

are, for instance, contactors, alarm signals or binary inputs of

a PLC. The relay output has a potential-free “Form C” con-

tact. An “Alarm” LED indicates that the relay has responded.

Both alarm threshold and delay (td) can be adjusted at the

front panel. The adjustable delay range is 0 to 25 seconds.

The relay hold time can be selected between two and eight

seconds by means of DIP switch no. 0.

Figure 2 illustrates how the alarm management works.

Alarm

threshold

Alarm on

Alarm off

tdt

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 td starts. It can be adjusted at the front panel between

0 and 25 s. Since the signal drops below the threshold at point

 before the delay time was over, no alarm will be tripped at

point . By selecting an appropriate delay time is guaranteed

that no alarm will be tripped by short signal transients. They

may occur during machine start up or under the influence of a

short mechanical shock pulse. At point  the alarm threshold

is exceeded again and the delay time starts for the second

time. Now an alarm will be tripped since after td at point 

the alarm threshold is still exceeded. The relay remains active

until the vibration level drops below the limit at . Now the

alarm hold time th begins. It can be selected by DIP switch no.

0 between 2 and 0 seconds. When this hold time is over at

point  the relay switches back. The purpose of a pre-se-

lected hold time is to ensure save switching of external com-

ponents.

Level Display The bar graph display at the front panel has two functions. On

one hand, it shows the current RMS or peak-to-peak value of

the selected vibration quantity between 0 and 00 % of the

full-scale value. On the other, it shows the relay threshold

which can be adjusted by the potentiometer below.

The LED display gives comprehensible information about the

current status of the vibration monitor.

Please note also the optionally available display module

M 2DIS (see section 4.4).

Response time For time-critical monitoring applications the peak-to-peak

value is recommended because of its higher refresh rate at the

analog outputs and the relay output.

Self Test

Functions

It is expected that monitoring equipment should have a very

high reliability. Unnoticed faults need to be avoided and false

alarms as well. Maximum reliability of the M 2 is guaran-

teed by a two-stage self-test circuitry:

Monitoring of sensor bias voltage recognizes defective ac-

celerometers and cables. When an open loop at the sensor in-

put is detected, the “OK” LED is switched off. A short circuit

at the input is indicated by a flashing “OK” LED. In both

cases the relay will switch to alarm position whereas the

“Alarm” LED remains dark.

Power supply failure also causes the relay contact to switch

into the alarm position.

AC Output In addition to the DC outputs, the M 2 also provides a “raw”

vibration signal. By means of Jumper a selection can be

made between the buffered and unfiltered sensor signal or the

amplified, filtered and, if selected, integrated signal (see Fig-

ure ).

In the first case, the AC output provides the sensor signal with

a bandwidth of over 50 kHz. Please note that most standard

accelerometers have their resonance at 20 to 30 kHz.

In the second case, the AC signal is pre-processed in accor-

dance with the selected vibration quantity and the inserted fil-

ters.

Overload

Indication

An LED “OVL” is located at the front panel. It signals an

overload condition before the filters, after the amplifier and

after the integrators. If the LED starts flashing, the measuring

signal will still be undistorted but it reaches its limits at

± 0 V.

Power Supply The M 2 needs for operation a DC supply voltage of 2 to

28 V. Its current consumption is between 80 and 200 mA. The

lower the supply voltage, the higher the supply current.

Triple Insulation Optimum protection against grounding problems is achieved

by triple insulation between supply voltage, signal path and

current loop output.

Power

Supply

4-2 mA

Output

Signal Path

Figure 3: Triple Insulation

Indice

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