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Accordingly, the VMS 830-2 vibration monitor is

recommended for the monitoring and protection

of stand-alone machines and auxiliary balance of

plant (BOP) equipment such as fans, pumps,

centrifuges, mills and gears. Among other things it

allows observation according to ISO 10816(DIN 45665).

For evaluating the machine state, the VMS 830-2

vibration monitor provides velocity measurements

after machine-specific filtering and/or

displacement measurements (after additional

simple integration). Analog DC output signals

(current and voltage) corresponding to the

measured vibration are also provided.

Independently adjustable alarm level limits with

selectable response delay allow the

communication of Alert and Danger alarms via

appropriate assigned relays with dry contacts

(fail-safe-function).

For specific applications, contact your local

Meggitt representative.

During operation, the velocity sensor signal

(23 mV/mm/s) is converted by a preamplifier into

a standardized voltage signal (70.7 mV/mm/s). It

then passes through high-pass and low-pass filters

before being amplified by a two-step wide-band

amplifier to the level essential to the electronic

circuitry. It is user-configurable DIP switches that

determine which of the two possible

measurements/units – velocity or displacement –

is used for the vibration monitoring.

The DC-output signal (current loop output) is

available after true RMS rectification (RMS units).

The DC-output signal also acts with two

adjustable alarm level limit level detectors. The

response delay of the alarms/relays is set by DIL

switches to 1, 3, 5 or 10 seconds. The relays’

change-over contacts enable the Alert and

Danger circuits to operate as ether normally

energized (NE) or normally de-energized (NDE),

again, as set by DIL switches.

Accordingly, the VMS 830-2 vibration monitor is

recommended for the monitoring and protection

of stand-alone machines and auxiliary balance of

plant (BOP) equipment such as fans, pumps,

centrifuges, mills and gears. Among other things it

allows observation according to ISO 10816 (DIN 45665).

DESCRIPTION

The VMS 830-2 vibration monitor from Meggitt’s

vibro-meter® product line is a dedicated vibration

monitor for use in vibration measurement chains.

The VMS 830-2 is a two-channel vibration monitor

that measures vibration displacement (PEAK)

and/or vibration velocity (RMS), using industrystandard velocity sensors.

Each VMS 830-2 measurement channel is

independently configurable to measure

displacement or velocity. Each channel provides

one 0 or 4 to 20 mA current loop output and a

buffered “Raw” voltage output signal. Further, for

each measurement, two alarms (Alert andDanger) and three relays (OK, Alert and Danger)

are supported. The alarms/relays are easily userconfigurable using potentiometers and DIP

switches. The VMS 830-2 also features LCD displays

to show measurement values.

In addition, the VSV301 module has four basic

and two advanced logic functions that can be

used to combine local alarm and status

information in order to drive the module’s relays.

This local information and the logic function

outputs can also be used as inputs to the basic

logic functions of a VSI010 communications

interface module in the same measurement block.

Like all VibroSmart modules, the VSV301 module is

fully software configurable using the VibroSight

software. Using VibroSight Configurator, a module

can be configured to capture data continuously

at scheduled intervals or on the detection of an

alarm condition. In addition, spectral resolution,

frequency bandwidth, windowing function and

averaging are all fully configurable.

Using VibroSight Vision, an extensive catalogue of

plots is available for the visualisation and analysis

of measurement data.

VSV301 monitoring module

The VSV301 monitoring module performs the data

acquisition and all of the signal processing

(filtering, analog-to-digital conversion, time and

frequency domain processing, and resampling)

required to produce processed outputs and

extracted data for physical output and data

presentation in VibroSight and VibroSight Scope.

This includes spectral band extractions,

advanced FFT analysis, trending and limit checks

(alarm and sensor OK), and run-up / run-down acquisition.

In addition, the VSV301 module has four basic

and two advanced logic functions that can be

used to combine local alarm and status

information in order to drive the module’s relays.

This local information and the logic function

outputs can also be used as inputs to the basic

logic functions of a VSI010 communications

interface module in the same measurement block.

Accuracy

•Amplitude : ≤ 1% of input FSD (measurement bandwidth from 10 Hz to 1 kHz)

•Phase : ≤ 1.5 ° (measurement bandwidth from 10 Hz to 1 kHz)

Signal to noise ration (SNR) : ≥ 80 dB (measurement bandwidth from 10 Hz to 2 kHz)

Common-mode voltage (CMV) range : ± 5 V

Common-mode rejection ratio (CMRR) :> 60 dB (at 50 / 60 Hz)

Crosstalk attenuation : Typically 60 dB

Auxiliary input channel – used as a tachometer input

Triggering method :Crossing of threshold on rising edge of signal

Triggering threshold (rising edge) : 2/3 of peak-peak value

Voltage range : ± 30 VRMS / ± 42.4 VAC ( PEAK )  or  60 VDC

SPECIFICATIONS

Supported sensors

Currently available :Compatible with a range of sensors and signal conditioners using

2-wire current transmission and 3-wire voltage transmission

Dynamic input channels

Number of independent channels : 2

Measurement range

•Voltage (AC+DC) : ± 3 or ± 30 VPEAK

•Current : 15 or 150 mA

Frequency bandwidth (−0.1 dB) : 0.1 Hz to 19 kHz

•Analog high-pass filter :An optional (software configurable) analog high-pass filter can be

added to the AC path to configure the high-pass cutoff frequency

(−3 dB) as 0.1. 1.0 or 3.0 Hz.

This filter can also be disabled to allow DC-coupling of the input.

Input impedance

•Voltage : ≥ 100 kΩ, between the differential (high and low) inputs

•Current : 202 Ω ± 3 Ω, between the differential (high and low) inputs

Applications information

The VSV301 monitoring module is ideal for

monitoring, protecting, analysing and diagnosing

critical assets such as gas turbines, steam turbines,

hydro turbines and other rotating machines. A

VSV301 can be used as a stand-alone module or

as part of a more comprehensive monitoring

system operating with a VibroSight Server (and

data repository).

VibroSmart® systems (VSV30x + VSB300,

VSI010 + VSB010 and VSN010) conform to the

IEC 61850-3 requirements for power plant and

utility applications – when installed in specific

configurations. Contact Meggitt SA and/or refer

to the VibroSmart® distributed monitoring system

(DMS) hardware manual for further information.

For specific applications and other information,

contact your local Meggitt representative.

In addition, the VibroSmart Tools edition of

VibroSight is a special reduced functionality

(lower cost) version of the software with a

simplified user interface that is intended for use

with VibroSmart systems only. This edition is

capable of handling live data for static

measurements directly from VibroSmart system

(that is, it is not possible to connect to a VibroSight

Server).

Refer to the VibroSight® machinery monitoring

system software data sheet for further information.

 For example, measurements (dynamic or static) can

be logged to a VibroSight Server data repository

and/or displayed in the VibroSight Vision software.

The VibroSight Vision plot catalogue includes

static plots such as Bar chart, Spider, Table, Trend,

Bode, Polar, Correlation and Shaft Centerline,

and dynamic plots such as Waveform, Long

Waveform, Polar Waveform, Orbit, Corbit,

Spectrum and Full Spectrum, Waterfall/Cascade,

and Full Waterfall/Cascade.

Software

The VibroSight software supports the

configuration and operation of VibroSmart

modules, including the storage, display and/or

further processing of VSV30x data for analysis. For

example, measurements (dynamic or static) can

be logged to a VibroSight Server data repository

and/or displayed in the VibroSight Vision software.

The VibroSight Vision plot catalogue includes

static plots such as Bar chart, Spider, Table, Trend,

Bode, Polar, Correlation and Shaft Centerline,

and dynamic plots such as Waveform, Long

Waveform, Polar Waveform, Orbit, Corbit,

Spectrum and Full Spectrum, Waterfall/Cascade,

and Full Waterfall/Cascade.