Product Description
Product Overview
The Emerson MMS 6120 is a Dual Channel Bearing Vibration Monitor, designed for monitoring vibration levels in rotating machinery using electrodynamic vibration velocity sensors. It features dual independent sensor inputs, configurable frequency ranges, and advanced alarm control for precise vibration analysis and fault detection.
Key Features
• Two independent inputs for electrodynamic vibration velocity sensors
• Configurable frequency ranges (5 Hz to 1000/1600 Hz)
• Galvanically separated sensor power supply
• Adjustable measuring ranges (5–100 mm/s velocity, 25–1500 µm displacement)
• Redundant power supply input with low power consumption (max. 6W)
• RS-485 bus communication (supports up to 31 modules / 62 channels)
• Wide environmental tolerance (Operating: 0°C to +65°C, Storage: -30°C to +85°C)
Technical Specifications
Sensor Inputs
|
Parameter |
Specification |
|---|---|
|
Input Type |
Two independent electrodynamic vibration velocity sensor inputs (differential type) |
|
Input Resistance |
>100 kΩ |
|
Input Voltage Range |
-5 to +15 V DC |
|
Frequency Ranges |
Selectable from 5/10…50…1000/1600 Hz (DIN 45666 / ISO 3945) |
|
Lifting Coil Current |
Buffered lifting coil current output (open and short circuit proof) |
Measuring Ranges
|
Parameter |
Specification |
|---|---|
|
Adjustability |
Configurable via software |
|
Minimum Dynamic Input Voltage |
311 mV for 100% measuring range |
|
Maximum Dynamic Input Voltage |
9500 mV |
|
Accuracy |
±0.5% full-scale deflection (FSD) / ±0.5% configured value |
|
Velocity Range |
5–100 mm/s |
|
Displacement Range |
25–1500 µm (for PR 9266 / PR 9268 transducers) |
Sensor Supply
|
Parameter |
Specification |
|---|---|
|
Output Type |
Buffered lifting coil current output for each channel |
|
Galvanic Isolation |
Separated from system & supply voltages |
|
Short-Circuit Protection |
Yes |
|
Current Output |
0–8 mA, configurable in 40 µA steps |
|
Max Load |
3.4 kΩ at 8 mA / 13.6 kΩ at 2 mA |
Control Inputs
|
Parameter |
Specification |
|---|---|
|
Logic Inputs |
Common binary inputs for both channels |
|
Functions |
Alert & Danger Modes (make or brake) Channel/Module Inhibit Measuring Range Multiplication (adjustable factor 1.0000–4.9999) |
|
Voltage |
24 V logic |
|
Input Resistance |
>10 kΩ |
Keypulse Input
|
Parameter |
Specification |
|---|---|
|
Purpose |
1 pulse per revolution input for system control (order analysis) |
|
Voltage |
24 V logic |
|
Input Resistance |
>10 kΩ |
|
Pulse Duration |
Minimum 10 µs (slope triggering) |
Voltage Inputs
|
Parameter |
Specification |
|---|---|
|
Channels |
Two (one per channel) |
|
Purpose |
Not used in standard applications |
|
Input Voltage Range |
0–10 V |
|
Input Resistance |
>100 kΩ |
|
Resolution |
10-bit |
Power Supply
|
Parameter |
Specification |
|---|---|
|
System Design |
Redundant supply inputs (decoupled via diodes) |
|
Power Consumption |
Max. 6W (250mA at 24V) |
|
Number of Modules Supported |
31 modules / 62 channels per RS-485 bus |
|
Supply Voltage |
18–24–31.2V DC (IEC 654-2, Class DC4) |
|
Additional Modules |
If more channels are needed, an additional RS-485 bus is required |
Environmental Conditions
|
Parameter |
Specification |
|---|---|
|
Protection Class (Module) |
IP00 (DIN 40050) |
|
Protection Class (Front Plate) |
IP21 (DIN 40050) |
|
Climate Conditions |
DIN 40040, Class KTF |
|
Operating Temperature |
0°C to +65°C |
|
Storage & Transport Temperature |
-30°C to +85°C |
|
Relative Humidity |
5–95% (non-condensing) |
|
Vibration Resistance (IEC 68-2, Part 6) |
Amplitude: 0.15 mm (10–55 Hz) Acceleration: 16.6 m/s² (55–150 Hz) |
|
Shock Resistance (IEC 68-2, Part 29) |
Peak Acceleration: 98 m/s² Shock Duration: 16 ms |
|
EMC Compliance |
EN 50081-1 / EN 50082-2 |
