VIBRO-METER MPC4G2 Protective measuring card

Product Overview: Meggitt Vibro-Meter MPC4G2

The Vibro-Meter MPC4G2 (also referred to within the VM600Mk2 / VM600 machinery protection ecosystem) is a core vibration and machinery protection card designed by Meggitt (Sensing Systems).

Installed in the VM600 rack, it serves critical machinery protection applications for heavy rotating equipment, including gas and steam turbines, compressors, large pumps, and industrial fans.

The card processes input signals from proximity probes, accelerometers, velocity sensors, and dynamic pressure transducers.

It performs real-time digital signal processing (DSP) to calculate vibration values (amplitude, displacement, velocity) and speed parameters, executing fast hardware relay trips to protect equipment against catastrophic failure.

Vibro-Meter

Vibro-Meter VM600 MPC4 Module Board.

Technical Specifications Table

Parameter    Specification Details

Manufacturer / Brand    Meggitt / Vibro-Meter

Series / System    VM600 / VM600Mk2 Machinery Protection System (MPS)

Dynamic Input Channels    4 independent dynamic channels (vibration/pressure)

Auxiliary Channels    2 auxiliary channels (typically tachometer / phase reference)

Signal Input Compatibility    Piezoelectric Accelerometers, IEPE/CCP, Proximity Transducers (Eddy current), Velocity Sensors

Relay Outputs    4 user-configurable relays + 1 common circuit fault relay (FAULT)

Analog Outputs    Individual 4–20 mA current loops per dynamic channel + raw buffered voltage outputs

Signal Processing Unit    High-performance DSP with continuous Built-In Self-Test (BIST)

Configuration Software    VibroSight® Configurator & Software suite

Safety Certification    SIL 2 (Safety Integrity Level) compliant options available

Environmental Tolerance Conditions

To maintain operational integrity in industrial plant environments, the MPC4G2 module adheres to standard industrial enclosure and environmental tolerances:

Relative Humidity: 5% to 95% (non-condensing)

Vibration Resistance: Complies with IEC 60068-2 standards for continuous industrial vibration

Electromagnetic Compatibility (EMC): IEC 61000-6-2 (Immunity) and IEC 61000-6-4 (Emissions)

Operating Instructions

Hardware Alignment & Insertion

Ensure rack power is verified prior to insertion

Inspect the rear edge connector of the MPC4G2 module for debris. Slide the module into the designated slot of the VM600 rack along the guide rails until fully seated in the backplane. Tighten the top and bottom front panel thumb screws.

Rear Panel Interface Wiring (IOC4 Module)

Connect raw transducer and relay wiring

Connect raw sensor cables (proximity probes, accelerometers, or velocity sensors) to the associated IOC4 input/output card at the rear of the rack. Verify correct shielding and grounding connections to prevent ground loops.

Software Configuration via VibroSight

Set signal processing parameters

Open the VibroSight Configurator software on the host PC connected to the CPUM rack controller. Assign channel input types, engineering units, filter cut-offs, tracking ratios, and relay logic thresholds (Alert and Danger trip limits).

Loop Check & Calibration Verification

Validate trip logic prior to machine start

Inject simulated signals (using a signal generator) to verify channel readouts, 4–20 mA output response, and real-time relay trip actions before releasing the machinery protection system for live operation.

Fault Diagnosis

The MPC4G2 card features continuous Built-In Self-Test (BIST) capabilities and LED status indicators on the front panel. Below is a primary troubleshooting guide:

LED Indicator / Fault Code    Potential Cause    Recommended Action

DIAG / FAULT LED (Red)    Hardware internal test failure, CPU failure, or memory check error.    Perform a soft reset via VibroSight. If fault persists, replace the card module.

OK LED OFF (Channel Fault)    Sensor wire break, short circuit, or probe power supply failure (Transducer OK check failed).    Check field sensor cabling, gap voltage on proximity probes, or sensor power supply outputs on the rear IOC card.

ALARM / DANGER LED ON    Vibration level exceeds programmed trip setpoints.    Verify actual machine vibration levels. Check configuration thresholds in VibroSight to ensure setpoints match operational limits.

COMM LED Flash / OFF    Communication lost between MPC4G2 card and rack controller (CPUM).    Verify rack backplane seating, slot address setting, and CPUM communication status.

Related Models of the Same Series

The VM600 and VM600Mk2 product families encompass various protection, monitoring, and interface modules designed to work alongside or replace the MPC4G2:

Meggitt Sensing Systems |

IOC4 / IOC4Mk2: Associated Rear Input/Output Interface Card for the MPC4 series.

MPC4Mk2: Second-generation machinery protection card for standard and SIL-2 applications.

Meggitt Sensing Systems