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3500/46M Hydro Monitor
Datasheet
BentlyNevadaMachineryCondition Monitoring 144408Rev. Y
Description
The3500/46MHydro Monitor is a four-channelinstrument that accepts input from proximity, seismic, dynamic pressure and air gap sensors. Themonitor conditions thesignalto providevibration, position and both static and dynamic pressuremeasurements. It then compares theconditioned signals with user-programmablealarms. Hydro Radial Vibration channels combinetheshaft gap movement with theNXamplitudeto providea measurement to alarm on shear-pin failure.
Using the3500Rack Configuration Software, you can configurethe3500/46MHydro Monitor to perform the following functions:
•Hydro RadialVibration
•Hydro Air Gap
•Hydro Velocity
•Hydro Acceleration
•Hydro Thrust
•MultimodeHydro RV
•MultimodeAir Gap
•MultimodeHydro Velocity
•MultimodeThrust
•MultimodeAcceleration
•MultimodeHydro Dynamic Pressure
•Hydro Stator End Winding (SEW)
Themonitor channels areprogrammed in pairs. Each channelmay haveseparateor identical configurations.
3500/46MHydro Monitor |
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Datasheet |
144408Rev. Y |
Theprimary purposeofthe3500/46MHydro
Monitor is to providethefollowing:
•Machinery protection by continuously comparing monitored parameters against configured alarm setpoints to drivealarms
•Essentialmachineinformation for operations and maintenancepersonnel
Hydro Velocity channels provideearly warning ofpending machinery problems and assist in diagnosing them. Dueto thenatureofhigh amplitude, low frequency velocity events, theHydro Velocity channeltype cannot beused for automated machinery protection.
Each channel, depending on configuration, typically conditions its input signalto generate various parameters called static values. You can configurealert setpointsfor each active static valueand danger setpointsfor any two oftheactivestatic values.
You can configuremultimodechannels to haveup to eight sets ofalarm parameters including alert and danger set points and alarm timedelays. Each set may beconfigured for a specific machinemode.
As themachinechanges modes, themonitor can switch to a specific set using contacts on multimodeI/Omodules or software commands through a communications gateway.
2/16
3500/46MHydro Monitor |
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Datasheet |
144408Rev. Y |
Specifications
Inputs
Signal |
Accepts 1to 4proximity, air |
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gap, velocity or acceleration |
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sensor signals |
Power |
7.7watts, typical |
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consumption |
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Multimode |
50kΩ |
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positiveinput |
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I/O |
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Input Impedance |
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Prox/Velom |
10kΩfor Prox/Accel |
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I/Oand |
3.5MΩfor Velomitor |
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Multimode |
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Prox/Velom |
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I/O |
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Sensitivity |
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Hydro Radial |
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0.79mV/μm (20mV/mil), |
Vibration |
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3.94mV/μm (100mV/mil) or |
and |
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7.87mV/μm (200mV/mil) |
Multimode |
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Hydro RV |
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Hydro Air |
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0.20mV/μm (5mV/mil), |
Gap and |
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0.22 mV/μm (5.6mV/mil), |
Multimode |
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0.49mV/μm (12.5mV/mil) or |
Air Gap |
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0.55mV/μm (14mV/mil) |
Hydro |
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20mV/mm/s (508mV/in/s) |
Velocity and |
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Multimode |
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Hydro |
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Velocity |
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Hydro |
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3.94mV/μm (100mV/mil), |
Thrust and |
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7.87mV/μm (200mV/mil) or |
Multimode |
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11.22 mV/μm (285mV/mil) |
Thrust |
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Hydro |
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1.02 mV/m/s2 (10mV/g) or |
Acceleration |
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2.55mV/m/s2 (25mV/g) |
and |
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Multimode |
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Acceleration |
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Hydro SEW |
10.19mV/m/s2 (100mV/g) |
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Multimode |
Refer to theBently Nevada |
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Hydro |
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350300Dynamic Pressure |
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Dynamic |
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Sensor datasheet, document |
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Pressure |
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110M4613 |
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Outputs |
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Front Panel LEDs |
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OK LED |
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Indicates when the3500/46MHydro |
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Monitoris operating properly |
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TX/RX |
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Indicates when the3500/46MHydro |
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LED |
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Monitor is communicating with |
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other modules in the3500Rack. |
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Bypass |
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Indicates when the3500/46MHydro |
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LED |
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Monitor is in Bypass Mode. |
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Buffered |
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Thefront ofeach monitor has |
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Transducer |
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onecoaxialconnector for each |
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Outputs |
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channel. |
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Each connector is short-circuit |
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protected. |
Output |
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550Ω |
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Impedance |
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Transducer Power Supply |
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Prox/Velom |
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-23 Vdc nominalat 43 mA max |
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I/Oand |
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Multimode |
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Prox/Velom |
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I/O |
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Multimode |
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+23 Vdc nominalat 23 mA max |
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Positive |
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Input I/O |
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Recorder |
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+4to +20mA. Output is |
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proportionalto monitor full- |
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scale. |
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Oneoutput is provided for each |
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channel. |
3/16
3500/46MHydro Monitor |
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Datasheet |
144408Rev. Y |
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Monitor operation is unaffected |
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by short circuits on recorder |
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outputs. |
Voltage |
0to +12 Vdc rangeacross load |
Compliance |
Load resistanceis 0to 600Ω. |
(current |
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output) |
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Resolution |
0.3662 µA per bit |
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±0.25% error at room |
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temperature |
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±0.7% error over temperature |
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range |
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Updaterate100ms or less |
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Signal Conditioning
Specified at +25ºC(+77ºF) unless otherwisenoted.
Hydro and Multimode Hydro Radial
Vibration
Frequency Response
Direct filter |
0.104Hz to 500Hz |
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Rotor speed is 25to 1,500cpm. |
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Gap filter |
-3 dBat 0.05Hz |
Not 1Xfilter |
0.25to 128times rotor speed |
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Constant Q notch filter |
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Minimum rejection in |
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stopband of-50dB |
1Xand NX |
Constant Q Filter |
vector filter |
Minimum rejection in |
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stopband of–50dB |
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TheNvaluein NXis selectable |
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between 2 and 20(for |
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machinespeeds of25cpm to |
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1,500cpm) or 2 to 50(for |
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machinespeeds of25cpm to |
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600cpm). |
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1Xand NXvector, Not 1Xand |
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compositeparameters are |
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valid for machinespeeds per |
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selected NXvaluerange. |
Composite |
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NXamplitudemultiplied by the |
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percent changein gap from its |
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zero position |
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Specific for detecting Shear Pin |
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failure |
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Accuracy |
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Direct and |
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Within ±0.33% offull-scale |
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Gap |
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typical |
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±1% maximum |
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1Xand NX |
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Within ±0.33% offull-scale |
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typical |
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±1% 1Xmaximum |
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±3% NXmaximum |
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Not 1X |
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±1% offull-scaletypical |
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±3% maximum |
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Composite |
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±1% offull-scaletypical |
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Hydro Air Gap and Multimode Air Gap |
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Instantaneous |
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Provides instantaneous gap |
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Air Gap |
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measurements when the |
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pole-passing rateslows to |
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less than onepole/second |
AverageAir |
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Themonitor measures each |
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Gap |
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polegap and averages the |
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values for allpoles together |
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over onerevolution. |
Minimum Air |
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Theminimum polegap |
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Gap |
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valuein a revolution |
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Maximum Air |
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Themaximum polegap |
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Gap |
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valuein a revolution |
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Min Air Gap |
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Thepolenumber detected |
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PoleNumber |
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with theminimum gap value |
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in a revolution |
MaxAir Gap |
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Thepolenumber detected |
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PoleNumber |
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with themaximum gap |
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valuein a revolution |
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Allvalues except |
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instantaneous Air Gap are |
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valid when thepoles passing |
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rateis between 1and 200 |
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poles/second. |
4/16
3500/46MHydro Monitor |
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Datasheet |
144408Rev. Y |
Accuracy
AverageAir |
Within ±0.33% offullscale |
Gap |
typical |
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±1% maximum |
Minimum Air |
Within ±0.33% offullscale |
Gap |
typical |
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±1% maximum |
Maximum Air |
Within ±0.33% offullscale |
Gap |
typical |
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±1% maximum |
Hydro Velocity and Multimode Hydro
Velocity
Frequency Response
Bias |
Low-pass filter |
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Low Mode: -3dBat 0.02 Hz |
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High Mode: -3dBat 0.07Hz |
Direct |
Low Mode: 0.1875to 343.75Hz, |
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-3dB |
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High Mode: 0. 75to 1375Hz, - |
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3dB |
1Xand 2X |
Constant Q Filter |
vector filter |
Minimum rejection in |
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stopband of–51dB |
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Low Mode: Valid for machine |
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speeds of60to 6,000cpm |
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High Mode: Valid for machine |
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speeds of60to 24,600cpm |
Filter Quality |
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High-pass |
4-pole(80dBper decade, 24 |
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dBper octave) |
Low-pass |
2-pole(40dBper decade, |
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12dBper octave) |
Accuracy |
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Direct |
Within ±1% offull-scale |
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typical |
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±2% maximum |
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Exclusiveoffilters |
1XAmplitude |
Within ±1% offull-scale |
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typical |
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±2% maximum |
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Exclusiveoffilters |
2XAmplitude |
Within ±1% offull-scale |
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typical |
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±2% maximum |
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Exclusiveoffilters |
Hydro Thrust and Multimode Thrust |
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Frequency Response |
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Direct filter |
-3dBat 1.2 Hz |
Gap filter |
-3dBat 0.41Hz |
Accuracy |
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Direct |
Within ±0.33% offull-scale |
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typical |
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±1% maximum |
Hydro Acceleration and Multimode
Acceleration
Frequency Response
Bias filter |
Low-pass filter |
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-3dBat 0.01Hz |
Not OK filter |
Low-pass filter |
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-3dBat 2400Hz |
1Xand 2X |
Constant Q Filter |
vector filter |
Minimum rejection in |
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stopband of–51dB |
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Valid for machinespeeds of |
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60cpm to 60,000cpm |
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SeeFrequency Ranges - |
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MultimodeAcceleration |
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Channelon thenext page. |
Filter Quality |
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High pass |
4-pole(80dBper decade, |
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24dBper octave) |
Low pass |
4-pole(80dBper decade, |
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24dBper octave) |
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