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• Turbine-Generator Sets       
• Steam Turbines       
• Gas Turbines       
• Pumps      
• Fans, Blowers
• Compressors    
• Industrial Machines       
The VMDS II is an advanced digital, software configurable, modular system using the latest  proven technology. The VMDS II is the successor of  the VMDS I protection system. It is designed following the requests of customers, the experience of CIS AMREIN in the field of machine protection systems and according industrial standards.

It is designed to cover complete and economic protection from  basic protection systems to extended complex multi-machine applications with up to 108 channels per rack.
The VMDS II  provides  4 and 8 –channel modules to monitor all machine related parameters as:

• Relative and absolute shaft vibration including true Smax
• Bearing vibration
• Eccentricity
• Shaft position
• Differential expansion
• Absolute expansion
• Servo/Valve position
• Rotative speed / overspeed
• Temperature and process parameters

The VMDS II provides common signal interfaces for the full range of standard sensors  and signal interfaces to  CIS AMREIN specific transducers. All sensor interfaces provide individual sensor power and sensor  fault monitoring circuits for each channel.
The VMDS II provides comprehensive alarm types, alarm logic functions and machine shutdown capabilities. Individual and common relays are available. Individual relays are assigned to each monitoring module without  loosing monitoring slots in the rack.
The VMDS II provides a complete range of analog signal inputs and outputs to cover also schemes in renovation projects where various analog inputs and outputs are required.
The VMDS II interfaces with DCS and PLC units for plant wide system integration with
industrial Ethernet, fieldbus or serial host communication interfaces                      (eg. Modbus TCP/IP,  Modbus RTU).

Software configurable with configuration software running under Windows® 98/XP/2000 and direct programmation on the rack controller module. 

The VMDS II can be easily interfaced with the powerful CAVAS on-line condition monitoring, analyse and diagnostic system.  

The modular redundant power supply concept, redundant monitoring functions and the fully autonomous working monitoring modules ensure a very high system reliability. 

• Turbine-Generator Sets       
• Steam Turbines       
• Gas Turbines       
• Pumps      
• Fans, Blowers
• Compressors    
• Industrial Machines        
The RKK is a modular monitoring system using independent analog and digital monitoring modules.
It is designed to cover complete and economic protection for basic protection system applications.
The RKK system provides  1–channel modules to monitor all machine related parameters as:

• Relative shaft vibration
• Bearing vibration
• Eccentricity
• Shaft position
• Differential expansion
• Absolute expansion
• Servo/Valve position
• Rotative speed / overspeed
Main Features:

• Redundant AC and DC power supplies available       
• Capacity: 12 channels per racks       
• 19" 3U rack       
• Removable terminal strip connectors for all I/O connections     
• Triple analog outputs per channel: 0/4-20mA, 0-10V, 0-100mV
• Integrated sensor power supply per module
• Sensor fault monitoring    
• Optional alarm modules with 2 alarm levels per module
• Digital speed monitoring module with up to 5 alarm levels.
• 2 out of 3 alarm modules   

Measurement Types:

• Differential Expansion            
• Axial Shaft Position
The SC-xxx units are designed for individual, single measurement applications.
The units can be mounted at the machine's foot or in a cabinet.
The SC-xxx provides  1–channel modules to monitor all machine related

Main Features:

• IP 66 alu cast housing with cable feedthroughs
• 70°C maximum operating temperature
• 0/4-20mA and 0-10V proportional analog outputs
• Sensor fault monitoring with fault output
• Integrated sensor power supply
• +24Vdc power supply                

CAVAS provides a complete solution for vibration monitoring of rotating machines.
Individual, multi-channel, distributed acquisition and processing subsystems (RMDAS P4700 units) are connected using standard networks to one or more database processors (Linux based) providing access to both real-time and historic data.

Typically turbine-generators and other main plant units have their own devoted RMDAS subsystems providing each unit with its own individual continuous on load, run-up and run-down monitoring independent of any other unit.
Other less critical auxiliary rotating machines may be grouped together to be monitored by a single RMDAS subsystem.
The RMDAS units receive the syubsystemsem
Each RMDAS unit maintains its own database on its internal disk so that it is independent of any other subsystem, network or similar.
Data is available on Windows PCs over LANs, WANs and modems for display in a variety of graphical and numerical forms.

Access by modem or VPN, is available by means of dial up networking and also directly through a CAVAS Admin PC.

CAVAS provides comprehensive alarm checking, mimics, trends, vector plots, orbits, FFT’s, waterfalls and so on for real time and historic data.
As well as acquiring vibration data (dynamic signals) from the protection systems (VMDS II, RKK) or sensors, each RMDAS unit may also directly capture plant process data (statics) to allow correlation between vibration levels and plant condition. 
Because it is networked CAVAS often receives plant process data from other computers via network. 
                               CAVAS Architecture Example

CAVAS Benefits:

•  Improved safety by decreasing the risk of machine failure.
•  Continuous machine health information allows predictive maintenance,
    avoiding and limiting machine damage.
•  Reduced capital costs by extending machine service life.
•  Decreased machine servicing costs by only repairing or replacing those  
    parts which are damaged or worn out.
•  Decreased machine repair costs by recognising problems before they cause 
    serious damage.
•  Reduced machine downtime by allowing machines to be maintained while in
•  Reduced risk of unplanned shutdowns by allowing scheduled maintenance
    to coincide with production requirements.

The benefits of monitoring rotating equipment with vibration sensors and process parameters are well known

•  Analyse bearing performance
•  Examination of critical speeds in runup/rundown modes
•  Data comparison at known speeds
•  More reliable trends
•  Ability to set up more accurate limits
•  Examination of blade frequencies
•  Full FFT processing of runup/down data
•  Historical data storage
•  Better control of machine rotor startup
With this information the operator and plant rotating equipment expert are better able to detect the following problems:                                                          
•  Shaft unbalance
•  Whirl problems
•  Shaft rubs
•  Shaft bowing
•  Bearing faults
•  Generator shorts
•  Damaged sealing strips
•  Misalignment
•  Shaft cracking
•  End winding vibrations
•  Looseness

CAVAS Data Presentation:

CAVAS user may view data collected by CAVAS on any PC or workstation on the network with the CAVAS User software installed. There are numerous displays available. The CAVAS User interface is powerful yet easy to use for casual users. It is a graphical user interface where selection of display type and channels is by mouse selection from pull-down or pop-up menus.
The CAVAS User interface was designed in conjunction with power plant control room engineers. CAVAS provides a number of graphical interface modules for specific functions.
Operator module provides mainly real-time data displays such as Mimics, Trends, Waterfalls, Orbits.
Historic displays data from the historical database.
Prodem is for diagnostics and displays full frequency spectra and
time histories
Config is a configuration editor
CAVAS supports a number of different levels of access on a per user basis, typically Expert, Engineer and Operator. This allows the system manager to control who can access configuration settings, create new layouts, change screen setups and the like.
CAVAS Data Storage:

Data is continuously acquired and displayed by CAVAS. Data is also saved to disk for long-term storage and historical presentation. For time-based states such as Onload or Barring then the user defines the logging rate to disk. For variable speed states such as runups or rundowns then all data is saved to disk. Data is stored in binary, fast-access, formatted files which maintain a “first-in first-out” cyclic storage scheme. A database is also maintained to provide pointers to significant events within this file structure such as start of events, alarms, startups and shutdowns so that data may be easily retrieved later.

Each RMDAS system contains a sufficiently large hard disk to allow several years worth on data to be stored online. The archive system also contains exchangeable media for backup or archive, typically a magneto optical disk. Data is written to this media on a daily basis as a backup. The amount of space available on this media is reported to the users and they are warned when it becomes full. This distributed database system allows a user to access data regardless of where it is stored.
Data may be extracted from the CAVAS database and file system. 


CAVAS Lite is the ideal investigative tool for Condition Monitoring of rotating machinery. It provides the same extensive facilities as a standard CAVAS system but as a lightweight portable unit.
CAVAS Lite is small enough to fit into a standard flight bag and rugged enough to withstand typical Power Station environment. 
Data can be acquired synchronous to a once per revolution tachometer signal to provide high accuracy harmonic and subharmonic measurements. Alternatively, it can be time-based for slow speed conditions or where a tachometer signal is not available.

A standard signal conditioning module allows inputs to be taken from accelerometers, velocity or displacement probes.

CAVAS Lite supports up to 24 inputs, which may typically be configured as 16 vibration inputs together with 8 plant analogue signals. The system detects plant operating conditions such as Onload, Overspeed, Runup, Rundown, Barring and Slow Roll and adapts its acquisition technique accordingly.

Typically access will be via a Notebook computer running Windows and using an ethernet connection. Using this connection CAVAS Lite may be configured and set to work, thereafter the Notebook may be taken away and the system may be left unattended to collect and store data to its internal disk.

The CAVAS Lite ethernet connection is available on the back panel. CAVAS Lite may be connected directly to a Desktop or Notebook PC.

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