Bently Nevada 3500/40M Data sheet

3500/40M Proximitor Monitor

Datasheet

Bently Nevada Machinery Condition Monitoring

Description

The 3500/40M Proximitor Monitor is a four-channel monitor
that accepts input from Bently Nevada proximity transducers,
conditions the signal to provide various vibration and
position measurements, and compares the conditioned
signals with user-programmable alarms. The user can
program each channel of the 3500/40M with the 3500 Rack
Configuration Software to perform any of the following
functions:

l Radial

vibration

l Thrust

position

The primary purpose of the 3500/40M Proximitor Monitor is to
provide the following:

l Eccentricity l REBAM

l Differential

expansion

141535 Rev. K



l Machinery protection by continuously comparing

monitored parameters against configured alarm
setpoints to drive alarms

l Essential machine information for both operations and

maintenance personnel

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 program the monitor channels in pairs. The monitor
channels can perform up to 2 of these functions at a time.
Channels 1 and 2 can perform one function, while channels 3

and 4 perform another (or the same) function.

3500/40M Proximitor Monitor
Datasheet 141535 Rev. K



Signal Conditioning

Specifications

Inputs

Signal

Power
consumption

Standard I/O

TMR I/O

Sensitivity

Radial Vibration

Thrust

Eccentricity

Differential
Expansion

REBAM

Outputs

Front Panel LEDs

OK LED

TX/RX LED

Bypass LED

Buffered
Transducer
Outputs

Output
Impedance

Transducer
Power
Supply

Accepts from 1 to 4 proximity
transducer signals

7.7 watts, typical

Input Impedance

10 kΩ
(Proximitor and acceleration
inputs

The effective impedance of three
bussed TMRI/O channels wired in
parallel to one transducer is50
kΩ

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)

3.94 mV/μm (100 mV/mil) or

7.87 mV/μm (200 mV/mil)

0.394 mV/μm (10 mV/mil) or

0.787 mV/μm (20 mV/mil)
40 mV/μm (1000 mV/mil) or

80 mV/μm (2000 mV/mil)

Indicates when the 3500/40M SIL
Proximitor is operating properly.

Indicates when the 3500/40M SIL
Proximitor is communicating with other
modules in the 3500 rack.

Indicates when the 3500/40M SIL
Proximitor is in Bypass Mode.

The front of each monitor has one
coaxial connector for each channel.

Each connector is short-circuit
protected.

550 Ω

-24 Vdc

Specified at +25 ºC (+77 ºF) unless
otherwise noted.

Radial Vibration

Frequency Response

User-programmable

Direct filter

Gap filter -3 dB at 0.09 Hz

Not 1X filter

Smax 0.125 to 15.8 times running speed

1X and 2X vector
filter

Single-pole
4 Hz to 4000 Hz or
1 Hz to 600 Hz

60 cpm to 15.8 times running
speed
Constant Q notch filter
Minimum rejection in stopband
of -34.9 dB

Constant Q Filter
Minimum rejection in stopband
of -57.7 dB

1X and 2X Vector, Not 1X, and Smax
parameters are valid for machine
speeds of 60 cpm to 60,000 cpm.

Accuracy

Exclusive of filtering

Direct and Gap

1X and 2X

Smax Within ±5% maximum

Not 1X











Within ±0.33% of full-scale
typical
±1% maximum

Within ±0.33% of full-scale
typical
±1% maximum

±3% for machine speeds less
than 30,000 cpm
±8.5% for machine speeds
greater than 30,000 cpm

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3500/40M Proximitor Monitor
Datasheet 141535 Rev. K

Thrust and Differential Expansion

Table 1: Relationship Between Nominal Shaft
Speed and the Valid Speed Range

Within ±0.33% of full-scale

Accuracy

Frequency Response

Direct filter -3 dB at 1.2 Hz
Gap filter -3 dB at 0.41 Hz

typical
±1% maximum

Eccentricity

Within ±0.33% of full-scale

Accuracy

Frequency Response

Direct filter -3 dB at 15.6 Hz
Gap filter -3 dB at 0.41 Hz

typical
±1% maximum



REBAM

Frequency Response

Spike

Element

Rotor

Direct

Gap

1X vector filter



User-programmable
from 0.152 to 8678 Hz

User-programmable for BPFO
ranging from 0.139 to 3836 Hz

High-pass corner is 0.8x BPFO.
Low-pass corner is 2.2x BPFO.

User programmable from 0.108
to 2221 Hz

Programmable from 3.906 to 14.2
Hz

Selection is determined by Spike
and Rotor filters.

Programmable from 0.002 to 1.0
Hz

Selection is determined by the
Rotor filter.

The range of shaft speeds for
which the value is valid depends
on the nominal shaft speed for
which the channel is configured.

Nominal Shaft

Speed (Hz)

Valid Speed Range (Hz)

10 to <126 0.071 to 160

126 to <252 0.133 to 330

252 to <504 0.25 to 660

504 to 584 0.50 to 750

If a multi-event gear or speed wheel
generates the speed input, the upper
limitation of the resultant input signal is
approximately 20 KHz.



Filter Quality

6-pole Elliptic

Spike high-pass

Element
bandpass

Rotor low-pass

Rotor, direct high­pass

Spike, direct low­pass

Gap low-pass

1X amplitude

(155 dB per decade, minimum)

Corner frequency is -0.1 dB.
8-pole Butterworth

(155 dB per decade minimum)

Corner frequency is -3 dB.
6-pole Elliptic

(155 dB per decade, minimum)

Corner frequency is -0.1 dB.
1-pole Butterworth

(18 dB per decade, minimum)

Corner frequency is -3 dB.

Corner is -0.3 dB maximum.

1-pole Butterworth
(18 dB per decade, minimum)

Corner frequency is -3 dB.
Constant Q of 16.67

Stopband frequencies are 0.91
and 1.09 times the running
speed.

Stopband attenuation is -51 dB
minimum.





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3/10