EVS-2
Electronic Vibration Switch
Installation and Operations Manual
00-02-0841
2013-01-14
Section 20
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our
Please read the following information before installing the EVS-2.
This installation information is intended for all EVS-2
models. A visual inspection of this product before
installation for any damage during shipping is
recommended.
Disconnect all power and be sure machine is inoperative
before beginning installation.
Installation is to be done only by qualified technician
according to the National Electrical Code.
Observe all Warnings and Cautions at each section in
these instructions.
Please contact FW MURPHY immediately if you have any
questions.
FW MURPHY has made efforts to ensure the reliability of the Electronic Vibration Switch (EVS-
2) and to recommend safe usage practices in system applications. Please note that in any
application, operations and device failures can occur. These failures may result in full control
outputs or other outputs which may cause damage to or unsafe conditions in the equipment or
process connected to the EVS-2.
Good engineering practices, electrical codes, and insurance regulations require that you use
independent external protective devices to prevent potentially dangerous or unsafe conditions.
Assume that the Murphy EVS-2 system can fail with outputs full on, outputs full off, or that other
unexpected conditions can occur.
specifications and designs at any time. The latest version of this manual can be found at www.fwmurphy.com.
Warranty – A limited warranty on materials and workmanship is given with this FW Murphy product.
A copy of the warranty may be viewed or printed by going to http://www.fwmurphy.com/warranty.
Table of Contents
Product Information ................................................................................................................... 1
Murphy EVS-2 Overview ..............................................................................................1
EVS-2 Characteristics and Orientation .........................................................................2
Installation ................................................................................................................................... 3
Mounting ......................................................................................................................3
Mounting Options .........................................................................................................4
Bracket Proposals ........................................................................................................5
Mounting Examples ......................................................................................................5
Plug Options .................................................................................................................6
Wiring ...........................................................................................................................6
Settings ...................................................................................................................................... 10
Setting the Set-Point in Inches Per Second (IPS) Peak ............................................. 10
Setting of Alarms ........................................................................................................ 13
Vibration Limits Based on Class of Equipment Based on ISO 10816-3 ..................... 14
Equipment Manufacturer Recommended Settings ..................................................... 16
Specifications ........................................................................................................................... 17
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Product Information
The Murphy EVS-2 can be used on any
equipment where abnormal vibration could
lead to equipment damage, including:
Cooling fans
Engines
Pumps
Compressors
Gear boxes
Motors
Generator sets
The Murphy EVS-2 can monitor and alert the
operator of abnormal vibration caused by a
variety of possible factors, including:
Imbalance
Misalignments
Worn sleeve bearings
Broken tie down bolts
Worn ball or roller bearings
Gear mesh
Blade pass frequencies
Detonation
Broken parts
Murphy EVS-2 Overview
The Murphy Electronic Vibration Switch (EVS-2) protects against equipment failure by
monitoring velocity-based vibration levels and providing an early warning or shutdown when
abnormal vibration is detected. The EVS-2 can be connected to Murphy’s TTD annunciator,
Centurion , Centurion PLUS or any third- party controller that accepts a switch input or 420mA signal for increased functionality.
NOTE: The Murphy EVS-2 complements Murphy’s VS2 shock and
excessive vibration switch, which is designed to detect an abnormal shock
due to equipment failure and to shutdown other equipment in a system to
prevent further damage.
Features
Universal use, can be mounted horizontal, vertical or at any other angle
Piezoelectric-crystal internal sensor with built-in microelectronics for reduced noise
sensitivity
Electronically integrated output signal that measures and trips on velocity (IPS peak)
Two independently adjustable output channels
Shutdown setpoint measured in velocity (IPS peak)
4-20 mA output for continuous monitoring capability
Solid-state outputs for setpoint trip
Adjustable time delay to prevent false tripping on high-vibration start-ups or non-
repetitive transient events
RAW 100mV/g output also available
Applications
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EVS-2 Characteristics and Orientation
1
Red Channel 2 LED (K2)
2
Spring terminal 16-24 AWG.
3
Channel 2 (K2) Vibration Set Point
Potentiometer (Pot)
4
DIP switches for vibration ranges and time
delays.
5
Channel 1 (K1) Vibration Set Point
Potentiometer (Pot)
6
Yellow Channel 1 (K1) LED
To prevent damage to the EVS-2 vibration switch, the following vibrations may not be
exceeded:
Vibration 15 g
Shock 150 g
Two-Channel LED Indicators
Two independent, adjustable level detectors with selectable delay times are equipped with
corresponding relays which are typically used for Alarm and Shutdown. Both channels use the
same vibration range selection.
Red and Yellow LED indicators representing these two channels are illuminated during normal
use. When a fault is activated, the LED indicators will turn off.
IMPORTANT! Because the EVS-2 resets automatically when the
vibration level returns below the set point, it is important to ensure
that the fault has been addressed before restarting the equipment.
Figure 1 – Inside view of Murphy EVS-2 component locations
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Installation
Mounting
The Murphy EVS-2 must be mounted and set in accordance with the guidelines in this manual
to obtain the desired and specified performance and equipment protection.
Mounting occurs via a ½” NPT thread, the tightening torque is hand tight plus 2 to 3 turns.
When using a mounting bracket, ensure that mounting surfaces are smooth and flat.
Care must also be taken that the mounting surface is not subject to natural vibrations. Using a
high stiffness mounting surface prevents natural vibrations which cause measurement errors.
WARNING! Exceeding the torque specification will damage the
aluminum housing. If there is concern of the device becoming
loose due to excessive vibration, use a permanent thread locker
such as Loctite 271 (RED).
Figure 2 – Product Dimensions and Sensitivity Axis
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Mounting Options
The following diagrams illustrate example mounting options for the EVS-2 using a simple pipe
plug welded to the machine surface or a bracket with the special adapter provided for drilled
and tapped surface mount.
NOTE: The special adapter is available for sale. Also note that a hollow
pipe close nipple is NOT recommended for installations.
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