SHINKAWA VM-5 Series Monitor

SHINKAWA VM-5 Series API 670 Standard Turbine Monitoring System

In the field of modern industrial automation, especially for the protection and monitoring of key rotating machinery such as steam turbines, gas turbines, and large compressors, the reliability, accuracy, and flexibility of monitoring systems are crucial. The VM-5 Series monitor launched by Shinkawa, as a specialized mechanical protection system that fully complies with the American Petroleum Institute API 670 standard, has become the preferred monitoring solution for turbine management systems (TSI) and large power generation machinery due to its modular design, highly flexible configuration, and comprehensive fault detection capabilities.

This article will delve into the system architecture, core monitoring unit technology, redundancy design, and application advantages of the VM-5 series in complex industrial scenarios.

1. Modular architecture and flexible configuration

The biggest feature of the VM-5 series is its excellent modular design, which can be flexibly combined according to different system scales and on-site environments. The system mainly consists of four core units: monitoring unit, relay unit, power unit, and instrument rack.

Instrument rack type: The system provides two rack models.

VM-5H3 (8-slot rack): can install up to 8 monitoring units and related modules.

VM-5W1 (10 slot rack): can install up to 10 monitoring units.

VM-5G (Monogram): A compact single rack design with built-in power supply, suitable for small machinery or independent systems with limited space.

Dual power supply and hot backup redundancy: In order to ensure the continuous operation of the system during power supply fluctuations or instantaneous power outages in industrial sites, VM-5 provides a unique power redundancy solution.

VM-5W1 Dual Power Instrument Rack: It can accommodate two VM-52Z power units, and when the main power fails, the backup power seamlessly switches in.

VM-5Z0 power backup module: This is a high reliability technology of the VM-5 series. When the rack detects an instantaneous power outage (such as lightning strike or grid switch), the module can immediately provide DC power backup to the system, with a support time of up to 0.2 seconds. This greatly avoids control logic misoperation or data loss caused by voltage fluctuations.

This modular architecture not only facilitates installation and maintenance, but also allows users to freely expand the system capacity based on the number of monitoring points (such as only monitoring vibration or simultaneously monitoring temperature and speed).

2. Detailed explanation of core monitoring unit technology

The VM-5 series offers 18 different monitoring units, covering full dimensional detection from vibration, displacement to speed and temperature. These units use high reliability Shinkawa transmitters as input front-end, ensuring the accuracy of data source.

Vibration monitoring: velocity, acceleration, and displacement

VM-5K Dual Channel Vibration Monitor: Supports FK series (speed sensor) or VC/CA series (acceleration sensor) inputs. It can simultaneously monitor the shaft vibration of two channels, providing universal DANGER and ALERT alarm settings.

VM-5B Dual Channel Acceleration/Velocity Monitor: Specially designed to monitor velocity, acceleration, and displacement (vibration velocity) simultaneously through CA series acceleration sensor input. It can automatically calculate the vibration values of the entire frequency band based on the sensor type, achieving accurate capture of early faults in rotating machinery such as bearing wear and imbalance.

VM-5M Dual Channel Path Monitor: With extremely high flexibility, it can simultaneously monitor relative and absolute vibrations, or relative and seismic vibrations, making it suitable for complex machinery that requires comparative analysis of multiple signals.

Mechanical position and differential expansion monitoring: compensation and calculation

VM-5C dual channel eccentricity monitor: mainly used to monitor the shaft deflection (eccentricity) of the rotor during start-up and operation. Detecting the offset of the rotor relative to the bearing center through the VK/RD/MS series displacement sensor is crucial for avoiding dynamic and static friction and shaft damage.

VM-5T dual channel thrust monitor: monitors the axial position (axial displacement) of the rotor. It receives displacement signals at the thrust bearing, which can not only monitor the wear of the thrust surface, but also make comprehensive judgments based on differential expansion signals.

VM-5D Dual Channel Differential Expansion Monitor: This is one of the most critical parts of turbine protection, used to monitor the differential expansion between the rotor and the casing caused by thermal expansion. In order to eliminate measurement errors, VM-5D adopts a unique complementary input technology. For example, sensors on the casing are usually located far away from the thrust bearing, and the VM-5D receives this signal and calculates the true differential expansion value, thereby eliminating measurement deviations caused by rotor uplift (such as changes in oil film thickness).