Vibro-Meter MPC4 VM600 200-510-076-114 - Image 1

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Vibro-Meter MPC4 VM600 200-510-076-114

Product Brief: The MPC4 is a plug-in 6U Eurocard that acquires up to four dynamic (AC) signals from vibration/position sensors (accelerometers, velocity pickups, eddy-current probes) plus two tacho/keyphasor inputs. It performs digital filtering (high-pass / low-pass / band-pass, 6–60 dB/octave, software-configurable), integration/differentiation, true RMS / peak / peak-peak calculation, order tracking, and compares against programmable Alert/Danger setpoints. Communicates with VM600 IOC4T/IOT modules via backplane for alarm relays, analog outputs, and host communication. Fully compliant with API 670.

Category: Vibro-Meter

Description

Working Principle: Amplifies and anti-alias filters conditioned sensor signals; digitizes via precision ADC; applies DSP algorithms for filtering, rectification, and feature extraction (amplitude, phase at 1× or nx run speed); continuously evaluates against alarm/danger limits; drives OK status and alarms through backplane to RLC16 or similar relay cards. Tacho inputs provide once-per-rev or multi-per-rev reference for phase and speed-dependent monitoring.

Input Channels (Dynamic): 4 × independent analog inputs

Voltage range: ±10 V AC max, DC offset 0 to ±20 V allowed
Common-mode range: –50 V to +50 V, CMRR > 60 dB @ 50 Hz
Input impedance: 200 kΩ
Bandwidth: buffered AC output DC to 60 kHz (–3 dB); processed bands 0.1 Hz – 10 kHz (configurable)
Current input option: 0–25 mA DC / ±8 mA AC max (via 324.5 Ω sense resistor)

Tacho / Keyphasor Inputs: 2 × independent, 24 V logic compatible (also accepts magnetic pickup after conditioning), > 100 kΩ input impedance, min. pulse width 10 µs

Filter Options: High-pass, Low-pass, Band-pass; slope 6 / 12 / 18 / 24 / 30 / 36 / 42 / 48 / 54 / 60 dB/octave (software-selectable); passband ripple ±0.3 dB; stopband attenuation > 50 dB

Measurement Types Supported: Shaft relative vibration (Smax, Sppmax), bearing housing absolute vibration (velocity/acceleration), casing vibration, thrust position (with MMS modules), slow roll vector subtraction, 1× / nx orbit & polar plots (via host software)

Alarm Functions: Per channel programmable Alert and Danger setpoints; time delay, hysteresis, latch/non-latch modes; alarm inhibition during startup

Front Panel: BNC connectors for raw dynamic signal monitoring; LEDs for Module OK, Alarm, Danger per channel group

Backplane Interface: VM600 proprietary bus; connects to IOC4T (I/O & Communication Card) for 4–20 mA outputs, relay driver, Ethernet/Modbus/Profibus gateway

Power Supply: +24 V DC via VM600 rack backplane (typical consumption ≈ 8–12 W)

Mechanical: 6U height (≈ 262 mm × 20 mm × 187 mm depth), approx. 0.40 kg

Operating Temperature: –25 °C to +65 °C

Humidity: 0–90 % RH non-condensing

Certifications (System Level): CE, UL, CSA; SIL 1 / SIL 2 capable (system-dependent); API 670compliant

Applicable Industries: Steam / gas / hydro turbine generator sets, compressor trains in LNG / refinery, large induced draft / forced draft fans, marine propulsion turbines, paper machine roll monitoring

Installation Requirements: Insert into designated slot of VM600 rack (ABE040 / ABE042 etc.); ensure IOC4T and RLC16/RLC04 relay cards are present for alarm handling; connect sensors observing shield grounding practice (single-point ground at preamp/probe end); download configuration via VibroSpectra or VM600 Configurator before placing in service.

Usage Notes: Always verify tacho polarity and teeth-per-rev setting — incorrect keyphasor configuration leads to wrong 1× amplitude/phase values; MPC4 is hot-swappable but alarm relays may momentarily de-energize — coordinate with machine protection logic; use BNC test points with 1 MΩ / 20 pF scope probe only to avoid loading the signal.

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