Murphy EVS-2 Manuale utente

00-02-0841

2013-01-14

Section 20

EVS-2

ElectronicVibrationSwitch

Installation and Operations Manual

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our

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.

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.

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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Section 20 00-02-0841

2013-01-14 - 1 -

Product Information

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 4-

20mA 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

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

Section 20 00-02-0841

2013-01-14 - 2 -

EVS-2 Characteristics and Orientation

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.

Red Channel 2 LED (K2)

Spring terminal 16-24 AWG.

Channel 2 (K2) Vibration Set Point

Potentiometer (Pot)

DIP switches for vibration ranges and time

delays.

Channel 1 (K1) Vibration Set Point

Potentiometer (Pot)

Yellow Channel 1 (K1) LED

Figure

–Inside view of Murphy EVS-2 component locations

Section 20 00-02-0841

2013-01-14 - 3 -

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

–Product Dimensions and Sensitivity Axis

Section 20 00-02-0841

2013-01-14 - 4 -

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.

Section 20 00-02-0841

2013-01-14 - 5 -

Bracket Proposals

Mounting Examples

Legend: C=Compressor, E=Engine

Compressor

Cx (Compressor) = Crankshaft endplay

Cy = Main Bearings, Rod Bearings

Cz = Main Bearings

Engine

Ex (Engine) = Crankshaft endplay

Ey = Main Bearings

Ez = Main Bearings, Detonation, Rod Bearings

Section 20 00-02-0841

2013-01-14 - 6 -

Plug Options

High-pressure (non-hollowed), forged steel pipe

plug permanently welded to equipment or

bracket surface. Be sure weld is clear of

threads for maximum thread engagement.

Optional Adapter available from FW Murphy:

½” NPT, High-pressure (non-hollowed), steel

pipe plug, Male x Male to be used for direct

mount to equipment with a ½” NPT threaded

pilot hole.

Wiring

The method chosen to electrically connect to the switch should be mechanically flexible to

eliminate the measurement of vibration induced from conduit and to provide a moisture barrier

as well. Although Sealtiteand other flexible conduit have been used successfully, in areas of

extreme humidity or moisture Murphy recommends using an “SO” type cable along with a Div.

2 suitable rain-tight CGB Gland/Strain relief fitting. No stress should be possible on the wiring

to the terminal block. If such protection is not provided by the conduit system, some form of

stress relief must be installed.

WARNING! Certification compliance requires the use of a cable

gland and strain relief fitting.

To assure compatibility with EMI compliance standards, any signal level wiring such as

transducer or 4-20 mA wiring should use shielded cable in EMI proof conduit, separate from

any power wiring except the DC power for the EVS-2. AWG 16-26 wire can be used.

NOTE: It is strongly recommended that this cabling be installed using the

method defined in the Shipboard Cable/Cord Installation document (00-

02-0725 rev 08/2010). That document can be found by following this link

http://www.fwmurphy.com/evs-2.

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