II. Main Hardware Functions
Rack Resource Management: All boards in the rack (MPC4, AMC8, CMC16, etc.) are polled via the VME backplane bus for unified configuration management and hot-swapping support.
Local HMI (Unique Advantage)
Front panel LCD display + operation buttons allow for local viewing of: channel status, vibration values, alarm information, and rack IP address. On-site inspections can be performed without a computer; the panel also includes an alarm reset button (AR).
Data Forwarding and Protocol Gateway (Most Commonly Used)
Dual Ethernet Ports ETH1 / ETH2
ETH1: PROFINET, VM600 MPSx Configuration Software (MPS1/MPS2)
ETH2: Modbus TCP, Debug Access
Serial Port RS232: Local Debugging, Modbus RTU
Event Log Storage
Onboard non-volatile memory, storing up to 10,000 event log entries (alarms, over-limits, hardware failures, sensor OK failures), supporting fault tracing exported from the host computer.
Simple Field Data Calculation
Channel data scaling, extreme values, and logical comparisons; calculation results can be directly output to the DCS/PLC via the bus.
III. Hardware Structure and Installation Requirements
Form: 6U VME European-style card; dual-card structure (front and rear)
Front Slot: CPUM (CPU motherboard with display)
Rear Adjacent Slot: IOCN (Communication I/O daughter card, indispensable)
Compatible Rack: ABE040 / ABE042 (VM600 standard 6U 19-inch rack)
Power Supply: Powered by the rack’s RPS6U power module
Operating Environment: -10℃ ~ +60℃; standard operating conditions for industrial steam turbines and gas turbines
IV. Supported Communication Scenarios
Configuration Software: VM600 MPS1/MPS2, VibroSight (equipment status monitoring platform)
DCS/PLC:
✅ Modbus TCP/RTU (mainstream power plant and petrochemical systems)
✅ PROFINET IO (Siemens PLC system)
Note: PROFINET only for ETH1 Main network port supported; ETH2 cannot run PN.
V. Typical Application Industries
Gas turbines, steam turbine generator sets, large compressors, booster compressors, blowers
Application scenarios: Thermal power, combined cycle power plants, oil refining and petrochemical plants, offshore platforms.
VI. Common Fault Phenomena and Troubleshooting Directions
CPU panel black screen, no display
Check the RPS6U power supply and backplane VME bus contact; clean the gold fingers.
Network connection failure, host computer cannot find the rack
Verify ETH1/ETH2 IP and subnet; confirm the network cable is connected to the correct port; loose IOCN daughter card is a frequent fault point.
Frequent SLOT ERROR/Unrecognized I/O card reports
CPUM firmware version incompatible with MPC4/AMC8 firmware; unified firmware version is required.
The alarm cannot be remotely reset; it can only be reset locally via a button.
MPS software permission settings and Modbus register remote reset function are not enabled.
The DIAG light remains red after startup.
There is a hardware fault on a board in the rack or a corrupted configuration file. The configuration should be cleared and reinstalled.
Application Scenarios
I. Power Industry (Most mainstream application, largest share of existing capacity)
1. Gas Turbine / Combined Cycle Power Plant
Equipment: Heavy-duty gas turbines (GE, Siemens, Mitsubishi, Ansaldo), combined cycle units with one or more turbines on each other
Monitoring Parameters: Bearing X/Y vibration, shaft vibration, axial displacement, rotor differential pressure, speed, overspeed protection, cylinder vibration, key phase
Functions:
1) Outputs hard-contact interlock to trip the turbine when vibration exceeds limits;
2) Sends real-time data to the power plant’s DCS;
3) Uploads raw vibration waveforms/spectrums to VibroSight for blade and bearing fault prediction.
Deployment: The gas turbine is mounted on a VM600 rack, and a CPUM rack is installed in the local control cabinet.
2. Steam Turbine Generator Sets (Thermal Power, Cogeneration, Self-owned Power Plants)
Equipment: Steam turbine, extraction condensing unit, back pressure unit
Monitoring: Shaft vibration, bearing vibration, thrust shaft displacement, eccentricity, thermal expansion, zero speed, vibration protection
Scenario Characteristics: The unit is a critical main equipment and must meet the power industry’s IEC 61508 SIL2 protection requirements; CPUM works with MPC4 protection cards to achieve safety interlocking.
3. Large Rotating Auxiliary Equipment in Power Plants
Boiler induced draft fans, forced draft fans, primary air fans, large circulating water pumps; small and medium-sized steam-driven feedwater pumps.
Mostly used for adding vibration protection and online monitoring to important auxiliary equipment.
II. Oil & Chemical Industry (Refining, Ethylene, LNG, Long-Distance Oil & Gas Transportation)
1. Large Centrifugal Compressors (Core Scenarios)
Equipment: Cracking gas compressors, propylene compressors, circulating hydrogen compressors, natural gas booster compressors
Monitoring Focus: Shaft vibration, axial thrust displacement, rotational speed, dry gas seal status monitoring
Value: Continuous operation of chemical plants results in extremely high losses from unplanned shutdowns; the VM600 provides hardware-level independent vibration protection, independent of the host computer, and independently triggers shutdown interlocks.
2. Offshore Oil & Gas Platforms (FPSO, Offshore Gas Production Platforms)
Offshore platform gas turbine generators, oil & gas transmission compressors
Environmental Characteristics: High humidity, salt spray; VM600 rack wide-temperature design; CPUM supports PROFINET/Modbus TCP interface with platform control systems.
3. Pump Stations, Pipeline Booster Units
High-speed compressors for booster stations along long-distance natural gas pipelines.
III. Metallurgical Industry
Large blast furnace blowers (axial flow blowers), sintering main exhaust fans
These high-speed rotating equipment have a high risk of shaft vibration and are generally equipped with the Vibro-Meter VM600 first-generation system.
The CPUM collects vibration protection signals and connects them to the rolling mill/blast furnace central control DCS.
IV. Marine & Ocean Power (Merchant Ships, Special Engineering Vessels, Offshore Power)
Marine gas turbine generator sets, large turbochargers, main turbines
Marine engine rooms have compact spaces, requiring rack-mounted centralized collection of vibration and overspeed signals.
Monitoring data is transmitted to the ship’s engine room monitoring system via CPUM Ethernet.
V. Air Separation Industry (Large Air Separation Units)
Large air compressors, turboexpanders (core rotating equipment in air separation)
Expanders operate at extremely high speeds, requiring stringent vibration and axial displacement protection. Many existing projects use the first-generation VM600 CPUM solution.
VI. Two Typical Application Modes Based on System Function (Two Combinations Supported by the Same CPUM)
Mode 1: MPS Mechanical Protection System (Safety Interlock Priority)
Rack Configuration: CPUM + IOCN + MPC4 / AMC8 Protection Card
✅ Objective: Safety Protection
✅ Output: Hard relay contacts directly connected to the unit’s ETS trip circuit
✅ Typical Scenarios: Gas turbines, steam turbines, large compressors (must have independent hardware protection)
Mode 2: CMS Condition Monitoring System (Diagnostic Analysis Priority)
Rack Configuration: CPUM + IOCN + CMC16 / XMC16 Acquisition Card
✅ Objective: Acquisition of continuous waveforms, spectrum, and trends; early fault diagnosis of bearings/rotors
✅ Data uploaded to VibroSight monitoring software
✅ Often used in parallel with the MPS protection rack, with protection and diagnostics arranged separately.
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