The VM600 monitoring system for a million-unit nuclear power plant turbine primarily measures and monitors relative shaft vibration, absolute bearing seat vibration, axial displacement of the turbine rotor relative to the thrust bearing, and rotor elongation relative to the turbine cylinder reference point. Let's discuss the VM system below.

1. Hardware
Vibro-Meter's VM600 series machine protection and monitoring systems are based on a 19" x 6U frame and include different components depending on the application.
There are two basic types of systems:
Machine Protection System (MPS)
Condition Monitoring System (CMS)
MPS and CMS hardware can be integrated into the same frame.
The following details the hardware included in the MPS.
1) The ABE 04 X frame structure (19" x 6U) comes in two types: ABE040 and ABE042. The difference lies in the mounting position of the brackets within the frame.
2) RPS 6U frame power supply unit
3) MPC 4 frame protection card
4) IOC 4T MPC 4 input/output card
5) AMC 8 analog monitoring card
6) IOC 8T AMC 8 input/output card
The MPC 4 and IOC 4T cards must be used in pairs and cannot be used individually. This pair is primarily used for vibration monitoring.
Similarly, the AMC 8 and IOC 8T cards must be used in pairs and are primarily used for quasi-static parameters such as temperature, level, or flow.
A rack can contain:
>Only one pair of MPC 4 / IOC 4 T cards
>Only one pair of AMC 8 / IOC 8 T cards
>A combination of one pair of MPC 4 / IOC 4 T and one pair of AMC 8 / IOC 8 T cards

Depending on application requirements, the following types of cards can also be installed in the rack:

7) PLC 16-Relay Card (16 relays)

All of the above modules can be used to form a stand-alone MPS system, that is, a system not connected to a network.
A networked MPS system, in addition to the above hardware, also includes the following hardware for the ABE 04 X frame:
8) CPUM CPU card
9) IOCN input/output card (matching CPU M)
Depending on the application (regardless of whether the frame is a stand-alone or networked configuration), one or more of the following low-noise power supply components may be used outside the frame:
>APF195 DC-DC converter
>APF196 AC-DC converter
>Any customer-supplied equivalent low-noise power supply unit
These devices must be used with GSI 1 XX galvanic isolation units, GSV safety barriers, and converters/proximitors with currents greater than 25 mA.
2. Software
One of the following software packages is required to configure the MPS:
1) MPS 1 Configuration Software. This software configures the MPC 4 and AMC 8 cards in the networked VM600 rack, which contains a set of CPUs for control and communication. All cards in the rack can be configured in "oneshot" mode via Ethernet.
2) MPS 2 Configuration Software. This is an expanded version of the MPS 1 software package. In addition to providing all the functionality of MPS 1, MPS 2 software also includes MPC 4 and AMC 8 management, unit diagrams, and data trending.
3. MPS Communication Methods

The MPS system can be configured in a variety of ways, depending on the hardware installed in the ABE04X rack.

1) The following figure shows the simplest MPS configuration. This is a stand-alone rack. In this case, the MPC 4 or AMC 8 card in the rack must be configured using a personal computer via RS-232 communication, which is connected via the 9-pin connector on the front of the rack.

4. MPS Monitored Parameters
The MPC 4 card in the MPS system can measure the following parameters:
> Absolute vibration (saddle vibration)
> Relative vibration (radial vibration measurement, including DC gap voltage measurement)
> Absolute rotor vibration
> Rotor position (axial measurement)
> Smax vector value (compliant with ISO 7919 standard)
> Rotor eccentricity
> Absolute expansion
> Relative expansion (between rotor and stator)
> Cylinder expansion
> Displacement
> Dynamic pressure
The AMC 8 card in the MPS system can measure the following parameters:
> Temperature (direct connection of thermocouples or RTD probes with the IOC 8 T card)
> Any user-defined process variable, such as flow, level, valve position, etc.

Other MPS System Features:
> Hot swappable (hot pluggable) MPC 4, IOC 4 T, AMC 8, IOC 8 T, and RLC16 cards.
> These cards can be inserted or removed without powering down the ABE04X frame. > On-board configuration storage
> Online modification of all parameters while the MPS is running
> Real-time data processing
> Configurable transmitters
> Built-in power supply built-in self-test (BITE)
> Hazardous bypass function
> Alarm signal reset
> Alarm multiplication or adaptive monitoring
> Up to four inputs (vibration, dynamic pressure, etc.) can be connected to a single processing channel.