Pepperl+Fuchs VIM8 Series User manual

2
PL d
VIM8* Vibration Sensors
Manual

With regard to the supply of products, the current issue of the following document is applicable:
The General Terms of Delivery for Products and Services of the Electrical ndustry, published
by the Central Association of the Electrical ndustry (Zentralverband Elektrotechnik und Elek-
troindustrie (ZVE ) e.V.) in its most recent version as well as the supplementary clause:
"Expanded reservation of proprietorship"
Worldwide
Pepperl+Fuchs Group
Lilienthalstr. 200
68307 Mannheim
Germany
Phone: [phone] - 0
E-mail: [e-mail]
North American Headquarters
Pepperl+Fuchs nc.
1600 Enterprise Parkway
Twinsburg, Ohio 44087
USA
Phone: [phone]
E-mail: [e-mail]
Asia Headquarters
Pepperl+Fuchs Pte. Ltd.
P+F Building
18 Ayer Rajah Crescent
Singapore 139942
Phone: [phone]
E-mail: [e-mail]
https://www.pepperl-fuchs.com

V M8* Vibration Sensors
Contents
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1 Introduction................................................................................................................ 4
1.1 ontent of this Document............................................................................. 4
1.2 Target Group, Personnel ............................................................................... 4
1.3 Symbols Used ................................................................................................ 5
1.4 Intended Use .................................................................................................. 5
1.5 General Safety Instructions .......................................................................... 6
2 Product Description .................................................................................................. 7
2.1 Use And Application...................................................................................... 7
2.2 Display and Operating Elements..................................................................7
2.3 Vibration Monitoring...................................................................................... 8
2.3.1 Vibration Velocity Operating Range .................................................................................... 8
2.3.2 Frequency Response.......................................................................................................... 9
2.3.3 Bearing Status Parameter................................................................................................. 10
2.4 Accessories.................................................................................................. 12
3 Installation................................................................................................................ 13
3.1 Instructions for Mechanical and Electrical Installation ...........................13
3.2 Mounting....................................................................................................... 14
3.3 Tamper Protection of the Vibration Sensor ............................................... 15
3.4 Electrical Installation................................................................................... 16
4 Parameterization...................................................................................................... 19
4.1 Vibration Sensors for Vibration Velocity with Pre-Alarm
and Main Alarm ............................................................................................ 19
4.1.1 Parameterization via Rotary Switch .................................................................................. 19
4.2 Vibration Sensors for Vibration Acceleration with Window Function .... 22
4.2.1 Parameterization via Rotary Switch .................................................................................. 23
5 Troubleshooting....................................................................................................... 27
5.1 What To Do In The Event Of A Fault............................................................ 27
6 Repair and Servicing............................................................................................... 28

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V M8* Vibration Sensors
ntroduction
1 Introduction
1.1 ontent of this Document
This document contains information that you need in order to use your product throughout the
applicable stages of the product life cycle. These can include the following:
•Product identification
•Delivery, transport, and storage
•Mounting and installation
•Commissioning and operation
•Maintenance and repair
•Troubleshooting
•Dismounting
•Disposal
The documentation consists of the following parts:
•Present document
•nstruction manual
•Datasheet
Additionally, the following parts may belong to the documentation, if applicable:
•EU-type examination certificate
•EU declaration of conformity
•Attestation of conformity
•Certificates
•Control drawings
•Functional safety manual
•Additional documents
1.2 Target Group, Personnel
Responsibility for planning, assembly, commissioning, operation, maintenance, and dismount-
ing lies with the plant operator.
Only appropriately trained and qualified personnel may carry out mounting, installation, com-
missioning, operation, maintenance, and dismounting of the product. The personnel must have
read and understood the instruction manual and the further documentation.
Prior to using the product make yourself familiar with it. Read the document carefully.
Note
This document does not substitute the instruction manual.
Note
For full information on the product, refer to the instruction manual and further documentation on
the nternet at www.pepperl-fuchs.com.
Note
For specific device information such as the year of construction, scan the QR code
on the device. As an alternative, enter the serial number in the serial number search
at www.pepperl-fuchs.com.

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ntroduction
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1.3 Symbols Used
This document contains symbols for the identification of warning messages and of informative
messages.
Warning Messages
You will find warning messages, whenever dangers may arise from your actions. t is mandatory
that you observe these warning messages for your personal safety and in order to avoid prop-
erty damage.
Depending on the risk level, the warning messages are displayed in descending order as fol-
lows:
Informative Symbols
Action
This symbol indicates a paragraph with instructions. You are prompted to perform an action or
a sequence of actions.
1.4 Intended Use
The vibration sensor is used exclusively for measuring mechanical vibrations on machines and
mechanical systems. Use is only permitted within the specifications stated in the datasheet.
Typical applications are monitoring fans, ventilators, electric motors, pumps, centrifuges, sepa-
rators, generators, turbines, and similar oscillating mechanical systems. Read through this
manual carefully. Familiarize yourself with the device before installing, mounting, or operating.
Some product versions are suitable for use in hazardous areas. The relevant national or inter-
national directives and the instruction manual for the product must be followed.
Always operate the device as described in these instructions to ensure that the device and con-
nected systems function correctly. The protection of operating personnel and the plant is guar-
anteed only if the device is operated in accordance with its intended use.
Danger!
This symbol indicates an imminent danger.
Non-observance will result in personal injury or death.
Warning!
This symbol indicates a possible fault or danger.
Non-observance may cause personal injury or serious property damage.
aution!
This symbol indicates a possible fault.
Non-observance could interrupt the device and any connected systems and plants, or result in
their complete failure.
Note
This symbol brings important information to your attention.

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V M8* Vibration Sensors
ntroduction
1.5 General Safety Instructions
Responsibility for planning, assembly, commissioning, operation, maintenance, and dismount-
ing lies with the plant operator.
nstallation and commissioning of all devices may be performed only by trained and qualified
personnel.
t is dangerous for the user to make changes and/or repairs. Additionally, doing so voids the
warranty and excludes the manufacturer from any liability. n the event of any serious errors,
stop using the device. Secure the device against unintended operation. To have the device
repaired, return it to your local Pepperl+Fuchs representative or your sales center.
Note
Disposal
Electronic waste is dangerous. When disposing of the equipment, observe the current statutory
requirements in the relevant country of use and local regulations.

V M8* Vibration Sensors
Product Description
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2 Product Description
2.1 Use And Application
The vibration sensors of the V M8* product family determine the vibration magnitude using the
root mean square (RMS) method. This form of quadratic average determination or pre-filtering
allows precise statements to be made about trends relating to the status of the application.
Depending on the product versions, the vibration magnitude is determined either as the vibra-
tion acceleration (in g rms) or as the vibration velocity (in mm/s).
The vibration sensors have a safety integrity level (S L 2) for functional safety applications. Two
relay outputs with independently adjustable switching thresholds are available for functional
safety monitoring tasks. f a controller evaluates both relay outputs simultaneously, it is possible
to monitor a window range, as part of condition monitoring for example. You can set the switch-
ing thresholds and associated delay for the response time directly using rotary switches on the
vibration sensors and save them as a parameter set using a push button.
You can select a suitable sensor version from the V M8* product family based on the require-
ments of your application. The following aspects are the core characteristics of these sensor
versions; some sensors have more than one of these characteristics:
•Sensor versions for measuring the vibration velocity have adjustable switching thresholds
for a pre-alarm and main alarm.
•Sensor versions for measuring the vibration acceleration have a window function with an
adjustable lower and upper switching threshold. An alarm is always triggered if the vibra-
tion velocity is outside the monitoring window, i.e., when the speed is below the lower
switching threshold or above the upper switching threshold.
•Some sensor versions have an additional analog current output, which outputs a bearing
status parameter. This is weighted according to D N SO 13373. t enables a qualitative
assessment of the condition of rolling-element bearings.
•Some sensor versions are also suitable for use in hazardous areas. The relevant national
or international directives and the instruction manual for the product must be followed.
Vibration sensors from the V M8* product family always have two temperature readings: the
measuring head temperature T
M
and the ambient temperature T
A
.
•The measuring head temperature T
M
describes the maximum permissible temperature
range directly at the location where the sensor is mounted. The machine surface to be
monitored must therefore not exceed or fall below the specified measuring head tempera-
ture T
M
for the sensor.
•The ambient temperature T
A
describes the maximum permissible temperature range for
the ambient atmosphere in which the sensor is used.
The two temperatures are related as described below. The measuring head temperature T
M
is
always permitted to be a higher temperature than the corresponding ambient temperature T
a
in
the upper range. This means that the machine to be monitored is permitted to heat up to the
upper limit of T
M
and therefore contribute to the heating of the ambient atmosphere. However,
the resulting ambient temperature must not exceed the upper limit of T
A
.
Example
Temperature specifications:
•-35 °C  T
M
 125 °C
•-35 °C  T
A
 60 °C
The machine to be monitored must not exceed 125 °C at the location where the sensor is
mounted, while the ambient atmosphere in which the sensor is used must not exceed 60 °C.

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V M8* Vibration Sensors
Product Description
2.2 Display and Operating elements
The V M8* product family of vibration sensors have indicator and operating elements as shown
below.
Figure 2.1
1Housing cover
2"L M2 SET" rotary switch for setting the upper switching threshold
3LED indicators for upper switching threshold L M2
4"L M2 Time" rotary switch for setting the delay for the response time of the upper switch-
ing threshold
5"SAVE Config" button for saving the settings for L M1 and L M2
6"L M1 Time" rotary switch for setting the delay for the response time of the lower switch-
ing threshold
7LED indicators for lower switching threshold L M1
8"L M1 SET" rotary switch for setting the lower switching threshold
1
6
7
8
5
2
3
4
Note
The details of the LED indicators differ depending on whether the vibration sensor is the
version with a pre-alarm and main alarm or the version with the window function. For a detailed
description in terms of application, see chapter 4.

V M8* Vibration Sensors
Product Description
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2.3 Vibration Monitoring
2.3.1 Vibration Velocity Operating Range
The operating range of the vibration velocity is not constant over the entire measuring range. t
always depends on the current frequency at which the vibration sensor is vibrating.
Essentially, the higher the current frequency, the lower the detectable vibration velocity. This
can lead to a significantly high frequency, which can then lead to the current operating range of
the sensor in this state being smaller than the specified measuring range.
The maximum detectable operating range can be derived from the maximum detectable accel-
eration. This is 16.5 g (161.8 m/s
2
) for the entire frequency range.
The maximum measurable vibration velocity results from the following physical correlation:
The following figure depicting the vibration monitoring shows the operating range, which is lim-
ited by the maximum measurable vibration velocity in mm/s depending on the frequency. The
area above the curve shows the operating range that cannot be measured when recording the
vibration velocity, because the frequency is too high. The sensor outputs the vibration velocity
value that can only just be detected.
Example for a version with a measuring range of 128 mm/s:
•Assumption: Application vibrates at 80 mm/s at 400 Hz
•Sensor output: 64 mm/s
This is the vibration velocity value that can only just be detected at this frequency.
Figure 2.2
1Frequency in Hz
2Vibration velocity in mm/s
3Operating range of vibration monitoring
The following applies to sinusoidal
vibrations:

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V M8* Vibration Sensors
Product Description
Reading Example
2.3.2 Frequency Response
The typical frequency response of vibration monitoring for two frequency ranges is depicted
below.
Frequency Response: 10 Hz to 1000 Hz
The cut-off frequencies are 10 Hz and 1000 Hz with -3 dB damping.
Figure 2.3
Frequency (Hz) Maximum Measurable Vibration Velocity (mm/s)
250 103
400 64
1000 25
Table 2.1
1Frequency in Hz
2Gain in dB

V M8* Vibration Sensors
Product Description
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Frequency Response: 1 Hz to 1000 Hz
The frequency response was recorded using two reference sensors.
The cut-off frequencies are 1 Hz and 1000 Hz with -3 dB damping.
Figure 2.4
1Frequency in Hz
2Gain in dB

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V M8* Vibration Sensors
Product Description
2.3.3 Bearing Status Parameter
Some product versions have an additional analog current output that outputs a bearing status
parameter. This is weighted according to D N SO 13373-3 and enables rolling-element bear-
ings to be diagnosed according to D N SO 13373-3.
The bearing status parameter according to D N SO 13373-3 considers the ratio of the highest
peak value of the acceleration in m/s
2
to the root mean square of the acceleration in m/s
2
. An
averaging time of t = 1 s is defined for the root mean square of the bearing status parameter.
The highest peak value is determined over the time period of the averaging period, i.e., t = 1 s.
The frequency range under consideration is between 10 Hz – 10 kHz. The signal ratio based
on the crest factor is used to diagnose the bearing condition of rolling-element bearings. The
D N SO 13373-3 standard categorizes the rolling-element bearing condition into four ranges:
Figure 2.5
The vibration monitoring continuously determines the bearing status parameter. The bearing
status parameter is scaled to the current output 4 mA – 20 mA using the following vibration
strength diagram.
XRoot mean square of acceleration (total value from 10 Hz to 10 KHz in mm/s
2
YMaximum peak value of acceleration in mm/s
2
1Range 1 = very low value
2Range 2 = usual (normal state)
3Range 3 = warning message
4Range 4 = alarm
Note
This vibration strength diagram is not recommended for machines with heavy background
noise or for gear-powered machines.

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Product Description
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Ranges and their output signals
2.4 Accessories
Available Accessories
Range Meaning Output signal I [mA]
Range 1 The bearing status parameter is very small. No bearing
damage can be detected.
We recommend that you repeat the measurement or
adjust the installation location.
f the bearing status parameter remains in range 1, you
can approve it as a normal range after carrying out a test,
such as frequency analysis and time range analysis.
4   8
Range 2 The bearing status parameter is in the normal range. The
characteristic value is in the usual normal state. There is
no bearing damage.
8   12
Range 3 The bearing status parameter is in the warning range. We
recommend carrying out a frequency analysis and time
range analysis to test the bearing.
12   16
Range 4 The bearing status parameter is in the alarm range. We
recommend replacing the bearings to troubleshoot the
issue.
16   20
Table 2.2
Note
Various accessories are available for the V M8* vibration sensors. These are available online at
www.pepperl-fuchs.com, on the product page for the relevant V M8* vibration sensor.
Accessories Use
Cordset for plug versions Electrical installation for plug versions
Mounting adapter Adapter with different thread sizes for specific mounting
requirements at the mounting point
Rubber protective sleeve Flexible plastic cover for additional protection of the sensor
against chemical and mechanical influences.
Flexible metal conduit Flexible metal conduit for additional protection of the internal
cable against chemical and mechanical influences.
Table 2.3

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nstallation
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3 Installation
3.1 Instructions for Mechanical and Electrical Installation
Always observe the following instructions to ensure safe operation of the vibration sensor:
Note
Further installation-relevant information on technical data, mechanical data, and available
connection lines for the relevant vibration sensor types can be found in the corresponding
datasheet.
Warning!
Work must be performed by trained and qualified personnel only.
Commissioning and operation of this electrical device must be performed by trained and quali-
fied personnel only. This means individuals who are qualified to commission (in accordance
with safety engineering), connect to ground, and label devices, systems, and circuits.
Warning!
Perform work only when the system is de-energized!
De-energize your device before performing work on the electrical connections. Short circuits,
voltage peaks, and similar events can lead to faults and undefined statuses. This presents a
significant risk of personal injury and property damage.
aution!
Work in a hazardous area!
De-energize your device or remove the housing cover before performing work on the electrical
connections.
Seal all unused cable glands with protective covers. Prevent the inside of the device from
becoming contaminated when the connector is disconnected.
Separate plug and socket devices must always be de-energized.
The housing cover must be properly screwed on for the sensor to be commissioned.
Lock the connection with interlock protection. Pay attention to the warning marking.
Do not remove the warning marking "Warning – Do not disconnect when energized!"
Ensure that the device and its measuring head are only operated in their permissible tempera-
ture ranges. Please refer to the relevant datasheet.
Warning!
Protect cables against interference and damage.
Protect the connection cable and any extension cables from electrical interference and
mechanical damage. Always observe the local regulations and instructions.
Warning!
Check electrical connections before switching on the plant!
Check all electrical connections before switching on the plant. ncorrect connections present a
significant risk of personal injury and property damage. ncorrect connections can lead to mal-
functions.

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V M8* Vibration Sensors
nstallation
aution!
The housing must be grounded.
The housing of the vibration sensor must be grounded when mounting, either via the machine
body or via a separate protective conductor (PE).
aution!
Do not perform any electrical modifications!
t is not permitted to perform electrical modifications on the vibration sensor. f you open or
modify the device yourself, you are endangering yourself and others, voiding any warranty, and
absolving the manufacturer of any liability.
aution!
Ensure that the data cable and power supply cable are physically separate!
To prevent interference, route the cordset for the vibration sensor so that it is a suitable distance
away from power supply cables. Shielded cables must be used to ensure reliable data transfer.
A perfect ground connection must be ensured. Always observe the local regulations and
instructions.

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3.2 Mounting
Prerequisites
Mounting the vibration sensor on the mounting surface:
•The mounting surface must be clean and flat, i.e., free of paint, rust, etc.
•The measuring head surface of the vibration sensor must lie flat on the mounting surface.
•Use the supplied hexagon socket cap head screw M8 x 20 and the spring washer M8 to
mount the vibration sensor.
•The mounting surface must either have a threaded hole M8 with a depth of 15 mm or you
can select a suitable thread adapter as an accessory.
Mounting the Vibration Sensor
For safe and error-free operation, observe the following requirements during mounting:
•Mount the vibration sensor on the mounting surface correctly to obtain accurate data.
•Avoid mounting the vibration sensor on auxiliary structures. f it is absolutely necessary to
use auxiliary structures, make sure these are designed to be as rigid as possible.
•Earth and ground loops are among the most common problems when using measuring
setups with sensitive sensor technology. These loops are caused by unwanted differ-
ences in potential in the circuit between the sensor and the control interface. As a
countermeasure, we recommend our standard grounding concept or, depending on the
application, our alternative grounding concept
•Make sure that the ground connection is electrically safe.
1. Unscrew the housing cover from the lower part of the housing using a hexagon wrench (SW 8).
Figure 3.1
2. Screw the vibration sensor firmly to the mounting surface.
•nsert the supplied hexagon socket cap head screw M8 x 20 and the spring washer M8 on
the vibration sensor.
•Tighten the hexagon socket cap head screw to a torque of 8 Nm using a torque wrench
(SW 6).
3. Screw the housing cover onto the lower part of the housing and tighten the housing cover to a
torque of 5 Nm using a torque wrench (SW 8).
8 Nm
5 Nm
Note
To prevent the housing cover from galling with the lower part of the housing,
the thread is treated at the factory with a mounting paste for stainless-steel
connections.

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V M8* Vibration Sensors
nstallation
4. For plug versions: Connect the connection cable and note that the tightening torque of the
connector's M12 union nut must not exceed 0.4 Nm.
3.3 Tamper Protection of the Vibration Sensor
Figure 3.2
1. After mounting the vibration sensor, attach the seal label (1) to the point joining the housing
cover and the lower part of the housing.
Note
Since safety-relevant settings for vibration monitoring can be changed by third parties by
unscrewing the housing cover, we recommend sealing the vibration sensor with a sealing label.
The seal label marked "SEALED" is destroyed when the housing cover is unscrewed and
therefore shows the plant operator that someone has attempted to tamper with the device.
1

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3.4 Electrical Installation
Grounding oncept 1 (Recommended)
Only applicable for:
•Versions with an integrated cable outlet
•Plug versions with a P+F connection cable accessory
•Assumption: Earth loops are not expected.
Note
Installation Diagram
Earth and ground loops are among the most common problems when using measuring setups
with sensitive sensor technology. These loops are caused by unwanted differences in potential
in the circuit between the sensor and the control interface.
Two different grounding concepts are described below. The appropriate concept should be
selected for the application. Note that different cable types and other accessories may be
required depending on the grounding concept.
Note
Various accessories are available for the V M8* vibration sensors. These are available online at
www.pepperl-fuchs.com, on the product page for the relevant V M8* vibration sensor.
Situation/Requirements of
the Application Effects of the Grounding oncept
No EMC faults expected from
the machine side,
e.g., from the frequency
inverter
•The machine should be connected to the sensor housing, or
there is no effect on the quality of the measurements provided by
the sensor.
•EMC faults that still directly affect the sensor head can discharge
via the machine earth.
Earth loops are possible This grounding concept cannot prevent earth loops because
there is a connection between the machine earth (point 1 in
Fig.) and the earth at the control interface (point 4 in Fig.).
Grounding concept 2 is recommended for applications with
long cables or with a risk of earth loops.
Coupled interference must be
deflected
•Deflected via machine earth (-> point 1 in Fig.)
or
•Deflected via earth at the control interface (-> point 4 in Fig.)
Table 3.1

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nstallation
The following diagram applies to each version with an integrated cable outlet or to each plug
version that is used in combination with a suitable P+F connection cable accessory. This
grounding concept is also recommended if no sources for EMC pollution, such as frequency
inverters, are used on the machine side. n this grounding concept, the sensor cable shield is
connected to the sensor housing. The sensor housing is at the same potential as the machine
earth and the earth of the control interface.
Figure 3.3
The grounding concept provides that the sensor cable shield is electrically connected to the
sensor housing via the knurled nut and is at the ground potential on the control interface or the
switch cabinet. The sensor side is the same on sensor versions with an integrated cable outlet.
n principle, there is a risk that very long cable lengths with a long distance between the
machine earth (1) and the earth (4) of the control interface could lead to an earth loop. This
would lead to continuous equipotential bonding between the machine and the control interface.
To prevent these earth loops, there should be no grounding (4) on the control interface. See
grounding concept 2 for more information. Nevertheless, further coupled interferences can dis-
charge via the machine earth (1).
1Machine earth
2Control interface (measuring instrument, PLC, etc.)
3Cable shield
4Ground potential for the control interface
5Optional flexible metal conduit (only available for version with an integrated cable)
1
2
5
1
2
53
4

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Grounding oncept 2 (Special ase)
Only applicable for:
•Versions with an integrated cable outlet
•Plug versions with connection cable accessories from third-party suppliers.
•Assumption: Earth loops are expected.
The following diagram applies to each version with an integrated cable outlet or to each plug
version that is used in combination with a suitable P+F connection cable accessory. This
grounding concept is also recommended if no sources for EMC pollution, such as frequency
inverters, are used on the machine side.
Figure 3.4
n this grounding concept, the sensor cable shield is connected to the sensor housing. The
sensor housing is at the same potential as the machine earth but is separated from the earth of
the control interface.
n principle, there is a risk that very long cable lengths with a long distance between the
machine earth (1) and the earth (4) of the control interface could lead to an earth loop. This
would lead to continuous equipotential bonding between the machine and the control interface.
To prevent these earth loops, there should be no grounding (4) on the control interface. Never-
theless, further coupled interferences can discharge via the machine earth (1).
Situation/Requirements of
the Application Effects of the Grounding oncept
No EMC faults expected from
the machine side,
e.g., from the frequency
inverter
•The machine should be connected to the sensor housing, or
there is no effect on the quality of the measurements provided by
the sensor.
•EMC faults that still directly affect the sensor head can discharge
via the machine earth.
Prevention of earth loops nec-
essary,
e.g., when using a long cable
approx. 500 m in length.
The earth on the control interface (-> point 4 in Fig.) is not inte-
grated. On the control interface, there is insulation between
the cable shield and the earth.
This grounding concept can prevent earth loops because
there is no connection between the machine earth (point 1 in
Fig.) and the earth at the control interface (point 4 in Fig.).
Coupled interference must be
deflected
Deflected via earth at the control interface (-> point 1 in Fig.)
Table 3.2
1Machine earth
2Control interface (measuring instrument, PLC, etc.)
3Cable shield
4Ground potential for the control interface
5Optional flexible metal conduit (only available for version with an integrated cable)
1
2
1
2
3
5
4