GE 3500/40M, 3500/40M Proximitor Specifications

3500/40M Proximitor® Monitor

Bently Nevada™ Asset Condition Monitoring

Description

The 3500/40M Proximitor® Monitor is a 4-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:

• Radial Vibration

• Thrust Position

• Differential Expansion

• Eccentricity

• REBAM®

Note: The monitor channels are programmed in pairs and can perform up to two 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.

The primary purpose of the 3500/40M monitor is to provide:

1. Machinery protection by continuously comparing monitored parameters
against configured alarm setpoints in order to drive alarms.

2. Essential machine information for both operations and maintenance
personnel.

Each channel, depending on configuration, typically conditions its input signal
into various parameters called “static values”. The user can configure alert
setpoints for each active static value and Danger setpoints for any two of the
active static values.

Specifications and Ordering Information

Part Number 141535-01

Rev. E (10/08)

Page 1 of 11

Specifications

Indicates when the 3500/40M is
operating properly.

Inputs

Signal

Input
Impedance

Standard I/O

TMR I/O

Power
Consumption

Sensitivity

Radial Vibration

Accepts from 1 to 4 proximity
transducer signals.

10 kΩ

The effective impedance of three
Bussed TMR I/O channels wired in
parallel to one transducer is 50
kΩ.

7 watts typical

3.94 mV/µm (100 mV/mil) or

TX/RX LED

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

Bypass LED

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

Buffered
Transducer
Outputs

The front of each monitor has one
coaxial connector for each
channel. Each connector is short­circuit protected.

Output
Impedance

550 Ω

Transducer
Power Supply

-24 Vdc

Thrust

Eccentricity

Differential
Expansion

REBAM

Outputs

Front Panel
LEDs

OK LED

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).

Signal Conditioning

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

Radial Vibration

Frequency
Response

Direct filter

User programmable, 4 Hz to 4000
Hz or 1 Hz to 600 Hz.

Gap filter

-3 dB at 0.09 Hz.

Not 1X filter

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

-34.9 dB. (See Note that follows)

Smax

0.125 to 15.8 times running
speed. (See Note that follows)

1X and 2X
Vector filter

Specifications and Ordering Information

Part Number 141535-01

Rev. E (10/08)

Page 2 of 11

Accuracy

Direct and Gap

1X and 2X

Smax

Not 1X

Thrust and
Differential
Expansion

Frequency
Response

Direct filter

Gap filter

Accuracy

Eccentricity

Frequency
response

Direct filter

Gap filter

Accuracy

Constant Q Filter. Minimum
rejection in stopband of -57.7 dB.

Note: 1X & 2X Vector, Not 1X, and Smax
parameters are valid for machine speeds
of 60 cpm to 60,000 cpm. Machines
ramping up from a stop must reach 72
cpm before reaching an OK state.

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

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

Within ±5% maximum.

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

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

-3 dB at 1.2 Hz.

-3 dB at 0.41 Hz.

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

-3 dB at 15.6 Hz.

-3 dB at 0.41 Hz.

REBAM

Frequency
response

Spike

Element

Rotor

Direct

Gap

1X Vector filter

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

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 is
dependent upon the nominal
Shaft Speed for which the
channel is configured. The
following table summarizes the
relationship:

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

Note: If a multi-event gear or speed wheel
generates the speed input, the resultant

Specifications and Ordering Information

Part Number 141535-01

Rev. E (10/08)

Page 3 of 11

Filter quality

Spike high-pass

Element
bandpass

Rotor low-pass

Rotor, Direct
high-pass

Spike, Direct
low-pass

Gap low-pass

1X amplitude

Accuracy

Amplitude

Phase

input signal has an upper limitation of
approximately 20 KHz.

6-pole Elliptic (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.

Within ± 0.33% of full scale
typical, ± 1% maximum when
input signal is at the center
frequency of the proportional
value's passband.

3 degrees error, maximum.

Channels
enabled

Certain configurations allow the
user to enable only one channel
of a channel pair. See discussion
and graphs in the final pages of
this datasheet.

Filter tracking/
stepping (requires a
valid speed signal)

Initial condition

Nominal filter set used.

Switch from
nominal to
lower filter set

Current shaft speed ≤ 0.9 x
(Nominal Shaft Speed).

Switch from
lower to
nominal filter
set

Current shaft speed ≥ 0.95 x
(Nominal Shaft Speed).

Switch from
nominal to
higher filter set

Current shaft speed ≥ 1.1 x
(Nominal Shaft Speed).

Switch from
higher to
nominal filter
set

Current shaft speed ≤ 1.05 x
(Nominal Shaft Speed).

Shaft speed
error condition

Nominal filter set used.

Alarms

Alarm setpoints

The user can set Alert levels for
each value measured by the
monitor and Danger setpoints for
any two of the values measured
by the monitor. All alarm setpoints
are set using software

Specifications and Ordering Information

Part Number 141535-01

Rev. E (10/08)

Page 4 of 11