Bently Nevada 3500/46M Data sheet
3500/46M Hydro Monitor
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The 3500/46M Hydro Monitor is a four-channel instrument
that accepts input from proximity, seismic, dynamic pressure
and air gap sensors. The monitor conditions the signal to
provide vibration, position and both static and dynamic
pressure measurements. It then compares the conditioned
signals with user-programmable alarms. Hydro Radial
Vibration channels combine the shaft gap movement with
the NX amplitude to provide a measurement to alarm on
shear-pin failure.
Using the 3500 Rack Configuration Software, you can
configure the 3500/46M Hydro Monitor to perform the
following functions:
l Hydro Radial Vibration
l Hydro Air Gap
l Hydro Velocity
l Hydro Acceleration
l Hydro Thrust
l Multimode Hydro RV
l Multimode Air Gap
l Multimode Hydro Velocity
l Multimode Thrust
l Multimode Acceleration
l Multimode Hydro Dynamic Pressure
l Hydro Stator End Winding (SEW)
144408 Rev. Y
The monitor channels are programmed in pairs. Each
channel may have separate or identical
configurations.
3500/46M Hydro Monitor
Datasheet 144408 Rev. Y
The primary purpose of the 3500/46M Hydro
Monitor is to provide the following:
l Machinery protection by continuously
comparing monitored parameters
against configured alarm setpoints to
drive alarms
l Essential machine information for
operations and maintenance personnel
Hydro Velocity channels provide early
warning of pending machinery
problems and assist in diagnosing
them. Due to the nature of high
amplitude, low frequency velocity
events, the Hydro Velocity channel type
cannot be used for automated
machinery protection.
Each channel, depending on configuration,
typically conditions its input signal to generate
various parameters called static values. You
can configure alert setpoints for each active
static value and danger setpoints for any two
of the active static values.
You can configure multimode channels to
have up to eight sets of alarm parameters
including alert and danger set points and
alarm time delays. Each set may be configured
for a specific machine mode.
As the machine changes modes, the monitor
can switch to a specific set using contacts on
multimode I/O modules or software
commands through a communications
gateway.
2/16
3500/46M Hydro Monitor
Datasheet 144408 Rev. Y
Hydro SEW 10.19 mV/m/s2 (100 mV/g)
Specifications
Inputs
Signal
Accepts 1 to 4 proximity, air
gap, velocity or acceleration
sensor signals
Multimode
Hydro
Dynamic
Pressure
Outputs
Refer to the Bently Nevada
350300 Dynamic Pressure
Sensor datasheet, document
110M4613
Power
consumption
Multimode
positive input
I/O
Input Impedance
Prox/Velom
I/O and
Multimode
Prox/Velom
I/O
Sensitivity
Hydro Radial
Vibration
and
Multimode
Hydro RV
Hydro Air
Gap and
Multimode
Air Gap
Hydro
Velocity and
Multimode
Hydro
Velocity
Hydro
Thrust and
Multimode
Thrust
Hydro
Acceleration
and
Multimode
Acceleration
0.79 mV/μm (20 mV/mil),
3.94 mV/μm (100 mV/mil) or
7.87 mV/μm (200 mV/mil)
0.20 mV/μm (5 mV/mil),
0.22 mV/μm (5.6 mV/mil),
0.49 mV/μm (12.5 mV/mil) or
0.55 mV/μm (14 mV/mil)
20 mV/mm/s (508 mV/in/s)
3.94 mV/μm (100 mV/mil),
7.87 mV/μm (200 mV/mil) or
11.22 mV/μm (285 mV/mil)
1.02 mV/m/s2 (10 mV/g) or
2.55 mV/m/s2 (25 mV/g)
7.7 watts, typical
50 kΩ
10 kΩ for Prox/Accel
3.5 MΩ for Velomitor
Front Panel LEDs
OK LED Indicates when the 3500/46M Hydro
Monitoris operating properly
TX/RX
LED
Bypass
LED
Buffered
Transducer
Outputs
Output
Impedance
Transducer Power Supply
Prox/Velom
I/O and
Multimode
Prox/Velom
I/O
Multimode
Positive
Input I/O
Recorder
Indicates when the 3500/46M Hydro
Monitor is communicating with
other modules in the 3500 Rack.
Indicates when the 3500/46M Hydro
Monitor is in Bypass Mode.
The front of each monitor has
one coaxial connector for each
channel.
Each connector is short-circuit
protected.
550 Ω
-23 Vdc nominal at 43 mA max
+23 Vdc nominal at 23 mA max
+4 to +20 mA. Output is
proportional to monitor fullscale.
One output is provided for each
channel.
3/16
3500/46M Hydro Monitor
Datasheet 144408 Rev. Y
Monitor operation is unaffected
by short circuits on recorder
outputs.
Voltage
Compliance
(current
output)
Resolution
0 to +12 Vdc range across load
Load resistance is 0 to 600 Ω.
0.3662 µA per bit
±0.25% error at room
temperature
±0.7% error over temperature
range
Update rate 100 ms or less
Signal Conditioning
Specified at +25 ºC (+77 ºF) unless
otherwise noted.
Hydro and Multimode Hydro Radial
Vibration
Frequency Response
Direct filter
Gap filter -3 dB at 0.05 Hz
0.104 Hz to 500 Hz
Rotor speed is 25 to 1,500 cpm.
Composite NX amplitude multiplied by the
percent change in gap from its
zero position
Specific for detecting Shear Pin
failure
Accuracy
Direct and
Gap
1X and NX Within ±0.33% of full-scale
Not 1X ±1% of full-scale typical
Composite ±1% of full-scale typical
Within ±0.33% of full-scale
typical
±1% maximum
typical
±1% 1X maximum
±3% NX maximum
±3% maximum
Hydro Air Gap and Multimode Air Gap
Instantaneous
Air Gap
Average Air
Gap
Provides instantaneous gap
measurements when the
pole-passing rate slows to
less than one pole/second
The monitor measures each
pole gap and averages the
values for all poles together
over one revolution.
Not 1X filter 0.25 to 128 times rotor speed
Constant Q notch filter
Minimum rejection in
stopband of -50 dB
1X and NX
vector filter
Constant Q Filter
Minimum rejection in
stopband of –50 dB
The N value in NX is selectable
between 2 and 20 (for
machine speeds of 25 cpm to
1,500cpm) or 2 to 50 (for
machine speeds of 25 cpm to
600 cpm).
1X and NX vector, Not 1X and
composite parameters are
valid for machine speeds per
selected NX value range.
Minimum Air
Gap
Maximum Air
Gap
Min Air Gap
Pole Number
Max Air Gap
Pole Number
4/16
The minimum pole gap
value in a revolution
The maximum pole gap
value in a revolution
The pole number detected
with the minimum gap value
in a revolution
The pole number detected
with the maximum gap
value in a revolution
All values except
instantaneous Air Gap are
valid when the poles passing
rate is between 1 and 200
poles/second.
3500/46M Hydro Monitor
Datasheet 144408 Rev. Y
Accuracy
Average Air
Gap
Minimum Air
Gap
Maximum Air
Gap
Within ±0.33% of full scale
typical
±1% maximum
Within ±0.33% of full scale
typical
±1% maximum
Within ±0.33% of full scale
typical
±1% maximum
Hydro Velocity and Multimode Hydro
Velocity
Frequency Response
Bias
Direct Low Mode: 0.1875 to 343.75 Hz,
1X and 2X
vector filter
Filter Quality
High-pass 4-pole (80 dB per decade, 24
Low-pass 2-pole (40 dB per decade,
Accuracy
Direct Within ±1% of full-scale
Low-pass filter
Low Mode: -3dB at 0.02 Hz
High Mode: -3dB at 0.07 Hz
-3dB
High Mode: 0. 75 to 1375 Hz, 3dB
Constant Q Filter
Minimum rejection in
stopband of –51 dB
Low Mode: Valid for machine
speeds of 60 to 6,000 cpm
High Mode: Valid for machine
speeds of 60 to 24,600 cpm
dB per octave)
12dB per octave)
typical
±2% maximum
Exclusive of filters
1X Amplitude Within ±1% of full-scale
typical
±2% maximum
Exclusive of filters
2X Amplitude Within ±1% of full-scale
typical
±2% maximum
Exclusive of filters
Hydro Thrust and Multimode Thrust
Frequency Response
Direct filter -3dB at 1.2 Hz
Gap filter -3dB at 0.4 1 Hz
Accuracy
Direct Within ±0.33% of full-scale
typical
±1% maximum
Hydro Acceleration and Multimode
Acceleration
Frequency Response
Bias filter Low-pass filter
-3dB at 0.01 Hz
Not OKfilter Low-pass filter
-3dB at 2400 Hz
1X and 2X
vector filter
Filter Quality
High pass 4-pole (80 dB per decade,
Low pass 4-pole (80 dB per decade,
Constant Q Filter
Minimum rejection in
stopband of –51 dB
Valid for machine speeds of
60 cpm to 60,000 cpm
See Frequency Ranges -
Multimode Acceleration
Channel on the next page.
24dB per octave)
24dB per octave)
5/16
Loading...