MACHINE MONITORING / TURBOMACHINERY PROTECTION
MMS 6140
Monitor for Absolute Shaft Vibration
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Architecture
Dual-channel MMS 6000 module
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Sensor Inputs
Eddy-current + seismic / piezo-electric
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Protection Function
Absolute shaft vibration calculation
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The MMS 6140 combines relative shaft vibration measured by an eddy-current sensor with bearing vibration measured by a seismic or piezo-electric sensor. The two signals can be processed together to calculate absolute shaft vibration, while either channel can also operate independently.
01 / Product Details
A dual-channel monitoring architecture for rotating machinery protection and vibration analysis.
Product Overview
MMS 6140 is a dual-channel monitor in the MMS 6000 machine monitoring family. Channel 1 is designed for an eddy-current sensor for relative shaft vibration, while Channel 2 is intended for a seismic or piezo-electric sensor for bearing vibration.
In dual-channel operation, the bearing vibration signal is phase-compensated and subtracted from the shaft vibration signal to obtain an absolute shaft vibration measurement. The resulting measurement can be processed according to configured parameters, monitored against alarm limits and delivered through the available analog and relay interfaces.
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Key Functions
• Two independent measuring channels
• Absolute shaft vibration calculation
• Independent channel operation
• Configurable warning and danger limits
• Sensor and module supervision
• RS232 and RS485 interfaces
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02 / Functional Characteristics
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Dual-channel measurement
Channel 1 handles eddy-current sensor signals and Channel 2 handles seismic or piezo-electric sensor signals.
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Absolute shaft vibration
The two channel measurements can be combined to calculate absolute shaft vibration after phase compensation.
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Flexible configuration
Measuring range, units, transducer sensitivity, warning limits, alarm limits and filter ranges can be configured.
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Order analysis
The module can calculate characteristic values for selected harmonics for vibration analysis.
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Built-in supervision
Sensor signal condition, wiring, supply voltage, configuration, measurement range, module temperature and watchdog status are supervised.
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Industrial communication
RS232 supports local configuration and readout, while RS485 supports connection to the MMS 6800 analysis and diagnostic system or host computers.
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03 / Technical Specifications
| Item |
MMS 6140 Specification |
| Module type |
Dual-channel measuring amplifier for eddy-current, seismic and piezo-electric sensors |
| Channel 1 |
Eddy-current sensor; input impedance ≥100 kΩ; input voltage −1 to −23 V; signal frequency range 1/5 to 50 to 2000 Hz |
| Channel 2 |
Seismic / piezo-electric sensor; input impedance ≥100 kΩ; input voltage −5 to +15 V; signal frequency range 5/10 to 50 to 1000/1600 Hz depending on configuration |
| Channel 1 signal range |
0 to 400 mVpp minimum range; 0 to 2000 mVpp maximum range, freely configurable |
| Channel 2 signal range |
311 mVpp minimum range to 9500 mVpp maximum range, freely configurable |
| Analog current output |
0/4 to 20 mA per channel; resolution 16 bit; accuracy ±1% of full-scale deviation; permissible burden ≤500 Ω |
| Voltage output |
0 to +10 V per channel; resolution 8 bit; accuracy ±1% of full-scale deviation |
| Dynamic output |
0 to 20 Vpp; load resistance >10 kΩ |
| Alarm limits |
Two independently adjustable alarm limits per channel; adjustment range 5 to 100% of full-scale deviation |
| Alarm delay |
0 to 5 seconds, adjustable in 1-second steps |
| Relay outputs |
Potential-free optocoupler outputs; maximum 48 V DC / 100 mA |
| Communication |
RS232 front interface and RS485 bus interface |
| Power supply |
18 to 31.2 VDC; nominal 24 VDC; maximum power consumption 8 W |
| RS485 capacity |
Maximum 31 modules / 62 channels on one RS485 bus |
| Operating temperature |
0 to +65°C |
| Storage / transport |
−30 to +85°C |
| Relative humidity |
5 to 95%, non-condensing |
| Protection class |
Module IP00; front plate IP21 |
| Format |
Eurocard format according to DIN 41494; 100 × 160 mm PCB format |
| Dimensions / weight |
30.0 mm width × 128.4 mm height × 160.0 mm length; net weight approximately 320 g |
04 / MMS 6000 Series Position
MMS 6140 belongs to the MMS 6000 machine monitoring family, where different modules are used for different rotating-machine measurement and protection tasks.
MMS 6110
Shaft vibration monitoring |
MMS 6120
Bearing vibration monitoring |
MMS 6140
Absolute shaft vibration |
MMS 6210
Displacement monitoring |
MMS 6220
Eccentricity monitoring |
MMS 6310
Keyphasor monitoring |
MMS 6312
Speed monitoring |
MMS 6410
Differential expansion monitoring |
The practical selection point for MMS 6140 is the need to combine shaft-relative vibration and bearing vibration for an absolute shaft vibration measurement, rather than treating the two measurement channels only as independent vibration inputs.
05 / Application & Fault Scenarios
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Turbine Protection
MMS 6140 is suited to turbine protection arrangements where shaft vibration and bearing vibration need to be evaluated together. The architecture is applicable to steam, gas and water turbines.
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Compressors & Turbomachinery
The module can be incorporated into protection and monitoring arrangements for compressors, fans, centrifuges and other high-speed rotating machinery.
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When Sensor Wiring Becomes Suspect
A wiring interruption or short circuit between a transducer and the module is included in the module supervision functions. This makes sensor-loop integrity an important check when a channel unexpectedly changes to an error state.
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When an Existing Module Is Replaced
Replacement should be checked against the existing MMS 6000 rack, sensor types, channel configuration, alarm settings, wiring arrangement and communication architecture before installation.
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Configuration consideration: When absolute shaft vibration is measured, the monitor filter needs to match the frequency response of the bearing vibration sensor. This adjustment is specifically noted as a controlled configuration item for the MMS 6140.
Supply & Order Details
Delivery
3–5 days |
Warranty
12 months |
Packaging
Brand New |
Payment
T/T |
Delivery Way
E-packing / FedEx / EMS / TNT / DHL / UPS |
Quotation Request
Part Number / Quantity / Destination / Required Date / Machine/System |
06 / MMS 6140 Buyer FAQ
Q1. Is MMS 6140 suitable when an existing turbine protection system needs an absolute shaft vibration channel?
Yes, provided the existing architecture uses compatible MMS 6000 hardware and the required sensor arrangement. MMS 6140 is specifically designed to combine the relative shaft vibration from an eddy-current sensor with bearing vibration from a seismic or piezo-electric sensor to calculate absolute shaft vibration.
Q2. What should be checked before replacing an existing MMS 6140 with another MMS 6140?
Check the MMS 6000 rack position, sensor types, channel wiring, alarm configuration, supply arrangement and RS485 communication architecture. The replacement should also preserve the required channel configuration and measurement ranges for the installed machinery.
Q3. Can MMS 6140 operate if only one of its two measurement functions is required?
Yes. The two channels can operate separately. Channel 1 can be used for shaft vibration and Channel 2 for bearing vibration. The dual-channel calculation is used when the application requires absolute shaft vibration.
Q4. Why is sensor compatibility particularly important when purchasing MMS 6140?
MMS 6140 has dedicated input characteristics for the two sensor types. Channel 1 is designed for eddy-current sensors, while Channel 2 is designed for seismic or piezo-electric sensors. The installed transducer type, signal range and required filter characteristics therefore need to match the intended channel configuration.
Q5. What can cause an MMS 6140 replacement module to remain in an abnormal state after installation?
Possible areas to check include sensor wiring, sensor signal level, supply voltage, configuration parameters, measurement range and module temperature. MMS 6140 includes supervision for these conditions. After power-on or recovery from an error state, the module also uses a defined delay period before alarm functions are fully enabled.
Return & Replacement Arrangement
Please contact us within 7 days if you have any question after you receiving the items.
Any returned item should remain in its original condition and be accompanied by the specific reason for the return. After the returned item is received and checked, we will arrange a return or replacement for the order when applicable.
Shipping costs generated by the return are the buyer's responsibility.
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Request a Quotation for MMS 6140
Please provide Part Number, Quantity, Destination, Required Date and Machine/System.
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