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3701/40 ADAPT Machinery Dynamics
Monitor
Datasheet
Bently Nevada Machinery Condition Monitoring
Advanced Distributed Architecture Platform Technology - ADAPT
The Bently Nevada Advanced Distributed Architecture
Platform Technology, or ADAPT 3701, is a family of compact,
high performance safety and machinery protection and
condition monitoring solutions. ADAPT products are targeted
at specific assets and applications, and excel at the intensive
signal processing necessary to identify early indicators of
machine failure modes long before an alarm.
Description
The 3701/40 Machinery Dynamics (MD) Monitor is designed for
3701/40 Simplex
use on a broad range of machine trains or individual casings
where the sensor point count fits the monitor’s channel
count and where advanced signal processing is desired. The
3701/40 is optimized for intensive signal processing required
on complex machinery such as gearboxes, planetary
gearboxes, and roller element bearing (REB) machines as well
as offering advanced measurement capabilities on
conventional monitoring methods such as radial vibration,
thrust position, and casing absolute vibration. The 3701/40
Dual Redundant (DR) monitor is designed for applications
that require a higher level of reliability from the vibration
system.
103M2037 Rev. J
3701/40 Duplex
The 3701/40 has a rugged industrial design allowing it to be
skid mounted close to the machine and reduce installation
wiring. Its compact size provides more mounting options
compared to traditional rack based solutions. It is capable of
accepting a wide array of sensor types, including eddy
current proximity probes, accelerometers, velocity,
acceleration, dynamic pressure, Integrated Circuit
Piezoelectric Sensors (IEPE), and magnetic speed pick-ups.
The 3701/40 is configured and validated with Bently Nevada
Monitor Configuration (BNMC) software. BNMC is a simple and
powerful configuration and verification software. It is ordered
separately and is required for operation.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
The 3701/40 MD Monitor is a self-contained
device that is ordered with a single part number
for either a simplex or duplex terminal base and
is made up of the following major components:
Part
3701 Simplex
Terminal Base
3701 Processor
Module
3701 Input Module 1 or 2
3701 Output
Module
Part
3701 Duplex
Terminal Base
3701 Processor
Module
3701 Input Module 1 or 2
3701 Output
Module
Quantity Required in
each 3701/40
1
1
1 or none
Quantity Required in
each 3701/40
1
2
1 or none
3701/40 Overview
protection system that utilizes dual redundant
processor modules.
In the DR version, each processor module is
identically configured and redundantly digitizes
and processes all sensor inputs, executes
identical logic, and each processor module
independently drives separate alarm relays.
3701 Digital Communications
The 3701/40 has two independent Ethernet
physical RJ45 connections per CPU for digital
communication with Bently Nevada software
products hosted on network computers and
plant automation systems. It uses a
proprietary Ethernet protocol for
communicating with System_1_Evolution
software and the BNMC configuration software.
The 3701/40 includes two Ethernet ports per CPU
which provide Ethernet TCP/IP communications
capabilities. Standard industrial protocols are:
l Modbus TCP/IP
Modbus over Ethernet is available for
connection to HMI’s, unit control systems, or
other plant automation equipment. The 3701
can only be configured as a server.
l Ethernet Global Data (EGD)
EGD is a GE protocol used on Mark VI and Mark
Vie controllers and by GE Programmable
Automation Controllers and certain 3rd party
automation equipment.
The 3701/40 is a robust, compact, selfcontained 12-channel device with
sophisticated signal processing capability and
with a form-factor suitable for distribution close
to machinery. It has a modular construction
that allows field changing of components and
is fully-configurable. It combines protection
and condition monitoring (CM) in a single
package. With the ability to define
measurements and alarms within the monitor,
it can act as a stand-alone protection and CM
system. There is no need for any interaction
with external software to trigger or control the
monitor during operation.
The 3701/40 DR Machinery Dynamics Monitor is
a compact, field mountable, vibration
3701/40 System Description
The 3701/40 monitor is powered by single or
dual redundant external +24 V DC power. It
consists of four main physical components: the
terminal base (single or dual), one or two
processor modules, one or two input modules,
and an output module.
The terminal base is the mounting platform for
the monitor. The different modules install into
the terminal base and two pluggable field
wiring termination blocks plug into the terminal
base. Sensor wiring terminates on the wiring
blocks and terminations for discrete inputs
(Reset, Trip Multiply, etc.) terminate directly on
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
the base but on the opposite side from sensor
wiring.
The processor module is the monitor’s CPU. It is
the center of the logic and signal processing for
the monitor.
There are two terminal base configurations:
l A simplex base, which contains 1 CPU
processor card
l A duplex base which contains 2 CPU
processor cards.
The use of 2 processor cards allows for
redundancy for all the dynamic
measurements; both processors have access
to all signal channels from each input module.
The input modules are the interface to the
sensors. Each input module type covers
multiple sensor varieties but due to the number
of sensor types there are different input
modules. The input modules condition the
analog sensor signals for delivery to A/D
conversion on the processor module. The input
modules are simple, reliable, analog circuitry
but with a simple microcontroller (outside the
protection path) to provide diagnostics and
fault detection on each module. Buffered
transducer outputs are provided at a multi-pin
Dsub connector on each input module. An
accessory cable is available to fan the buffered
outs to BNC or ADRE 408 Dspi compatible
connectors.
Processor Module
The processor module, or CPU module,
performs A/D conversion, digital signal
processing, alarm and logic processing, and
communications to Bently Nevada software
and plant automation systems. The CPU
module employs sophisticated diagnostics
and fault detection processing to enhance
reliability, availability, and maintainability of the
protection and monitoring system.
Input Modules
3701 Proximitor Accelerometer
Velomitor (PAV) Input Module
The 3701 PAV input module is a 6-channel +
Keyphasor/speed input module that interfaces
to a variety of sensors such as: -24 Volt
Proximitor sensors, -24 Volt 3-wire
Accelerometers, Velomitors, and constant
current 2-wire sensors that are compatible with
the -24 Volt 2-wire Velomitor interface.
Any of the PAV’s six channels (1 – 6) can be
independently configured for one of the
supported transducers. Each PAV supports one
dedicated Keyphasor or speed measurement
on channel 7 that is configurable for Proximitor
sensors or magnetic pick-ups.
3701 Proximitor Accelerometer
Seismic (PAS) Input Module
The output modules are for monitor outputs
such as relay contacts. At the current time only
the 8-Channel Relay Output Module is
available. It contains 8 programmable SPDT
relays and a dedicated monitor Protection
Fault (OK) Relay. Relay logic is created in the
BNMC software using the graphical logic editor.
The 3701 PAS input module is a 6-channel +
Keyphasor/speed input module that interfaces
to a variety of sensors such as: -24 Volt
Proximitor sensors, -24 Volt 3-wire
Accelerometers, 2-wire Seismoprobes and
compatible 3rd party inertial mass velocity
sensors, or dynamic pressure sensors.
Any of the PAS’s six channels (1 – 6) can be
independently configured for one of the
supported transducers. Each PAS supports one
dedicated Keyphasor or speed measurement
on channel 7 that is configurable for Proximitor
sensors or magnetic pick-ups.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
3701 Positive (PoV) Input Module
The 3701 PoV input module is a 6-channel +
Keyphasor/speed input module that interfaces
to a variety of positively powered sensors such
as: +24 V Proximitor sensors, +24 V Interface
modules, and 2 wire IEPE sensors using 3.3 mA
constant current.
Any of the PoV's six channels (1-6) can be
independently configured for one of the
supported transducers. Each PoV supports
one dedicated negatively powered Keyphasor
or speed measurement on channel 7 that is
configurable for Proximitor sensors or magnetic
pick-ups.
The POV is intended for interfacing to industry
standard 3rd party ICP sensors and also
sensors that use a 3 wire (power, common,
signal) positive voltage interface.
The POV is available for use with the 3701/40,
3701/44 Aeroderivative Gas Turbine Monitor, and
3701/46 Hydro Monitor.
Output Modules
3701 8-Channel Relay Output
Module
The 3701 8-Ch Relay Output Module provides 8
SPDT relay outputs or 4 "virtual" DPDT outputs
and a dedicated Protection Fault relay. Relay
logic is user programmable in the BNMC
software using the graphical logic editor. The
processor module operates on the relay logic
to drive relay state.
The Protection Fault relay is a normally
energized SPDT relay that will de-energize on
fault conditions that can compromise the
monitor’s availability to protect machinery. The
protection fault relay is similar to a traditional
OK relay but certain conditions that do not
compromise protection will not cause the
Protection Fault relay to de-energize.
The relays are configured for Normally DeEnergized (NDE) or Normally Energized (NE) in
four banks of two relays each by using switches
on the relay module. The relays are set for NE for
operation in the dual redundant system.
Relay wiring terminates on the output module
using pluggable connectors and exits on the
opposite side of the monitor from the sensor
inputs.
In dual redundant operation, processor
module one drives relays 1, 3, 5, and 7 and
processor module two drives relays 2, 4, 6, and
8. The relay alarm logic is identical. External
connection to an Emergency Shutdown Device
can use a 1oo2 or 2oo2 configuration
depending on the user’s needs. Users are
recommended to perform a system analysis
using functional safety methods (IEC 61511, IEC
61508 or ISA SP84) before selecting a voting
scheme.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
l Six discrete inputs (DI) for dedicated dry
Terminal Base
3701 Simplex Terminal Bases
The term “simplex terminal base” identifies, or
distinguishes this type of terminal base as one
with a single (simplex) processor module as
opposed to a dual (or duplex) terminal base
with two processor modules.
The 3701 simplex terminal base is the mounting
and installation component of the monitor. It
supports a single processor module, one or two
input modules, and an output module.
contact DIs: Trip Multiply, Alarm/Relay
Inhibit, Latch Reset, Special Alarm Inhibit,
Run Mode, and IP/Account reset. There
are two sets of these six inputs on the
dual terminal base.
l The terminal base also supports one
conditioned Keyphasor/Speed output for
each processor module and one input.
The conditioned I/O is for connecting
Keyphasors or Speed signals between
two or more 3701 monitors.
The terminal base mounts to a bulkhead, or
enclosure or wall sub-panel using the four
mounting holes at the corners of the base.
Mount vertically for optimal convection cooling.
3701 Dual Terminal Base
The Dual Terminal Base is similar in function to
the Simplex Terminal Base except that it has
two CPU processor modules instead of one.
The extra CPU module allows the user to use the
two input modules redundantly. Both CPU
modules have access to all the signal channels
from each of the input modules.
Terminal base features:
l Two pluggable terminal blocks provide
sensor wiring terminations that are
individually marked for the sensor wire
type. The termination blocks can be
removed for wiring ease or maintenance
work and, when installed, are fixed in
place with a locking mechanism.
l A dedicated connection terminal for
single point connection to system earth.
l A single point earth connection switch to
separate physical (chassis) earth from
system common (instrument earth) to
enable system common connection to
an external intrinsic safety earth.
l Primary and Secondary connectors for
single or redundant +24 V DC power
input.
Channel Types, Sensors, and Measurements
The 3701/40 Machinery Dynamics Monitor
supports a set of standard channel types and
the common sensors used with those channel
types as well as custom configurable sensors.
Support for sensor types is dependent on input
module type as listed in tables located below in
this datasheet section. Each channel type has
default measurements that can be enabled or
disabled and each channel type can have user
customizable nX and bandpass
measurements added to the channel and then
customized to the application.
The 3701/40 can have up to 12 vibration input
channels (Six per input module) and 2
Keyphasor/Sspeed inputs (one per input
module). The monitor supports the channel
types listed here:
l Acceleration
l Dynamic Pressure
l Radial Vibration
l Thrust Position
l Velocity
l Keyphasor/Speed
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Table 1: Channel Type Support by Input
Module
less than 10,000 rpm, and uses a Proximitor
sensor, but cannot be done with PoV.
Input Module Channel Types
PAS
Channels 1 - 6
PAS Channel 7
PAV
Channels 1 - 6
PAV Channel 7
Acceleration
Dynamic Pressure
Radial Vibration
Thrust Position
Velocity
Proximitor Speed
Magnetic Pickup Speed
Proximitor Speed (single
and multi-event)
Acceleration
Dynamic Pressure
Radial Vibration
Thrust Position
Velocity
Proximitor Speed
Magnetic Pickup Speed
Proximitor Speed (single
and multi-event)
PoV
Channels 1-6
Acceleration
Dynamic Pressure
Radial Vibration
Thrust Position
Velocity
PoV Channel 7
Keyphasor/Speed
(Proximitors, single and
multi-event or Mag
pickup, single and multi-
event).
PAV and PAS channels 1 – 6 can also be
configured to support an additional Keyphasor
input provided it is a single event per revolution,
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Table 2: Input Module Compatibility with
Acceleration Inputs
Input
Module
Accelerometer or Accelerometer
Interface Module
Input
Module
Accelerometer or Accelerometer
Interface Module
PAS 155023-01 High Freq 200g Accel I/F
Module
23733-03 Accel I/F Module
24145-02 High-Freq Accel I/F
Module
330400 100 mV/g Accelerometer
330425 25 mV/g Accelerometer
330450 High Temp Accelerometer
350501 Acceleration Charge
Amplifier
49578-01 Accel I/F Module
Custom
PAV 155023-01 High Freq 200g Accel I/F
Module
23733-03 Accel I/F Module
24145-02 High-Freq Accel I/F
Module
330400 100 mV/g Accelerometer
330425 25 mV/g Accelerometer
330450 High Temp Accelerometer
350501 Acceleration Charge
Amplifier
786-500 Wilcoxon Accelerometer
626B02 PCB Accelerometer
HS-170 Hansford Accelerometer
HS-100F series Hansford
Accelerometer
CMSS-2100 SKF Accelerometer
351M35 PCB Accelerometer
Table 3: Input Module Compatibility with
Velocity Inputs
Input
Module
Velomitors, Seismoprobes, and
Interface Modules
PAS 9200 Seismoprobe
74712 Hi Temp Seismoprobe
47633 Seismoprobe
86205 BoP Seismoprobe
Custom
PAV 330500 Velomitor
330525 Velomitor XA
190501 Velomitor CT
330750 High Temp Velomitor
330752 High Temp Velomitor
49578-01 Accel I/F Module
Custom
PoV GSI 122, 124 and 127 Galvanic
Interface Unit
TP100 Commtest Accelerometer
TP500 Commtest Accelerometer
200350 Accelerometer
200355 Accelerometer
330505 Low Freq Velocity Sensor
330530 Radiation Resistant
Velomitor
Custom
PoV HS-160 Velocity Sensor
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Table 4: Input Module Compatibility with
Measurements
Proximitor Sensors
Each channel type has a set of default
Input Module Proximitor Sensor
measurements typical of the channel type. In
addition, user customizable nX vectors and
PAS or PAV
PoV (Keyphasor)
3300XL 8 & 11 mm
3300XL NSV
3300 RAM Proximitor
3300 5 & 8 mm
bandpass measurements may be added to
each channel.
The number of measurements that can be
added and enabled depends on the signal
processing capability of the processor module.
There is no limitation, other than processor
3300 16 mm HTPS
7200 5, 8, 11, 14 mm
Custom
performance, to the number of measurements
that can be added to a single channel or
across all channels. A performance calculator
in the BNMC software provides feedback during
the configuration process on performance
Table 5: Input Module Compatibility with
Dynamic Pressure Inputs
margin as measurements are added or
removed and their attributes modified.
Input
Module
Dynamic Pressure Sensor
PAS 3-Wire (Com/Sig/-24VDC) 350500
DPCA
PAV 3-Wire (Com/Sig/-24VDC) 350500
DPCA orPCB 102M206
PoV 2-wire PCB 121A21
2-wire PCB 121A44
2-wire PCB 121A22
Measure Configurable Attributes (1)
Accelerometer
Bandpass
Full scale range
Units (g’s or m/s2 peak or rms; or
integrated accel: in/s or mm/s
peak or rms)
High pass corner frequency
Low pass corner frequency
High pass filter order (1,2,4,6, or 8
)
Low pass filter order (1, 2, 4, 6, or
8th)
Clamp value (amplitude)
nX Full scale range
Keyphasor association
Integer or non-integer order in
increments of 0.1x from 0.1x to 100x
(phase not valid for non-integer
orders).
th
8/25
Units (g’s or m/s 2 peak or rms; or
integrated accel: in/s or mm/s
peak or rms)
Clamp value (amplitude and
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Measure Configurable Attributes (1)
phase)
Velocity
Bandpass
Full scale range
Units (in/s or mm/s peak or rms;
or integrated veloc: mils or µm
peak-peak or rms)
High pass corner frequency
Low pass corner frequency
High pass filter order (1,2,4,6, or 8
)
Low pass filter order (1, 2, 4, 6, or
8th)
Clamp value (amplitude)
nX Full scale range
Keyphasor association
Integer or non-integer order in
increments of 0.1x from 0.1x to 100x
(phase not valid for non-integer
orders).
th
Measure Configurable Attributes (1)
Low pass filter order (1, 2, 4, 6, or
8th)
Clamp value (amplitude)
nX >Full scale range
Keyphasor association
Integer or non-integer order in
increments of 0.1x from 0.1x to 100x
(phase not valid for non-integer
orders).
Units (mils or µm peak-peak or
rms)
Clamp value (amplitude and
phase)
Gap Low Pass Corner Frequency
Clamp Value (Volts)
Thrust Position
Bandpass
Full scale range
Units (mils or µm peak-peak or
rms)
High pass corner frequency
Units (in/s or mm/speak or rms;
or integrated veloc: mils or µm
peak-peak or rms)
Clamp value (amplitude and
phase)
Bias Low Pass Corner Frequency
Clamp Value (Volts)
Radial Vibe
Bandpass
Full scale range
Units (mils or µm peak-peak or
rms)
High pass corner frequency
Low pass corner frequency
High pass filter order (1,2,4,6, or 8
th
Low pass corner frequency
High pass filter order (1,2,4,6, or 8
)
Low pass filter order (1, 2, 4, 6, or
8th)
Clamp value (amplitude)
nX Full scale range
Keyphasor association
Integer or non-integer order in
increments of 0.1x from 0.1x to 100x
(phase not valid for non-integer
orders).
Units (mils or µm peak-peak or
rms)
th
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Measure Configurable Attributes (1)
Clamp value (amplitude and
phase)
Bias Low Pass Corner Frequency
Clamp Value (Volts)
Dynamic Pressure
Bandpass
Full scale range
Units (psi dpp, psi pp, psi rms,
mbar dpp, mbar pp, mbar rsm)
High pass corner frequency
Low pass corner frequency
High pass filter order (1,2,4,6, or 8
)
Low pass filter order (1, 2, 4, 6, or
th
8
Clamp value (amplitude)
Measure Configurable Attributes (1)
Magnetic Pickup Speed
Speed Top Scale
Clamp Value
(1) Technically feasible configurations
depend on the interaction between
many factors. Certain selections may
not be feasible. Use the BNMC software
to create an off-line configuration to
determine technical feasibility.
th
nX Full scale range
Keyphasor association
Integer or non-integer order in
increments of 0.1x from 0.1x to 100x
(phase not valid for non-integer
orders).
Units (psi dpp, psi pp, psi rms,
mbar dpp, mbar pp, mbar rsm)
Clamp value (amplitude and
phase)
Bias Low Pass Corner Frequency
Clamp Value (Volts)
Proximitor Speed
Speed Top Scale
Clamp Value
Gap Low Pass Filter Frequency
Clamp Value (Volts)
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Spectral Bands
Waveforms and Spectral Data
Acquisition of multiple synchronous and
asynchronous waveforms can be configured
for each 3701 channel in the BNMC software.
These waveforms are used as the data source
for extraction of measurements that require
spectral data such as nX vectors and peak
extractions.
Waveform configuration for spectral data
consists of f
spectral data.
Asynchronous spectral waveforms:
F
can be set between 10 Hz and 40 kHz
max
in 12 discrete steps. F
The number of spectral lines can be set
from 12.5 to 3200 in 12 discrete steps.
Synchronous spectral waveforms:
Number of samples per revolution can be
set from 8 to 4096.
Number of revolutions per waveform can
be set from 1 to 1024.
Amplitude Extractions
An amplitude extraction is the amplitude at a
user configured center frequency and with a
user configured bandwidth. The band around
the center frequency is limited in size and can
range from a single spectral line (bucket)
closest to the configured center frequency, to
the center spectral line plus 5 lines on each side
(11 total buckets).
The source data for amplitude extractions are
asynchronous spectrums.
Multiple amplitude extractions can be
configured on a single channel and across
multiple channels.
and the number of lines in the
max
is always at 0 Hz.
min
Spectral bands are user configured with a start
and a stop frequency and return the average
energy in the band.
The source data for spectral bands are
synchronous and asynchronous spectrums
using either enveloped spectral or ordinary
spectral data.
Multiple spectral bands can be configured on a
single channel.
Applications for spectral bands and other
signal processing features are described in the
Applications section of this datasheet.
Alarming and Setpoints
Alert and Danger over and under alarm
setpoints can be created individually for each
measurement. Additionally, alarm attributes
such as enable/disable, alarm time delay
(ATD), and latching/non-latching can be
independently configured on each
measurement.
In addition, the alarming attributes
(enable/disable, ATD, and latching/nonlatching) can be set independently on the Alert
and Danger alarms on the same
measurement.
Relay logic is created in the graphical relay
logic editor in BNMC software by mapping the
enabled alarms to OR and AND gates to drive a
relay.
Individual relays can be configured as
latching/non-latching or enabled/disabled
independently (or in addition to) the settings
on the measurement alarms.
Network Operation
The processor module supports two Ethernet
RJ45 physical connections located on the
terminal base. The two connectors are termed
Net A and Net B and each has its own
configurable IP address. All configuration and
interface to Bently Nevada software as well as
communication using an industrial protocol is
with one or both of these connections.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Display and HMI Options
Bently Nevada offers System 1 Basic as a simple,
low cost, easily installed, and light footprint HMI.
System 1 Basic is part of the System_1_
Evolution platform and offers a subset of
System_1_Evolution functionality to provide a
basic operator display.
The Modbus TCP or EGD industrial protocols can
be used to serve data to an HMI where users
can build display environments using standard
3rd party HMI software.
Bently Nevada Configuration Software (BNMC)
BNMC software is necessary to configure and
verify the 3701/40 Machinery Dynamics Monitor.
BNMC is simple configuration software with a
nominal price that is used for monitor
configuration. It also has snapshot viewing of
timebase waveforms (including
Keyphasor/Speed) and spectrums to support
commissioning and setup of the 3701 and
sensor instrumentation system. Bently Nevada
Monitor Configuration software will run on most
Windows desktop or notebook computers and
is designed and fully tested for operation on
Microsoft Windows 7 and 8.1 (32 bit and 64 bit)
and Microsoft Windows 2008 and 2012 Server
(64 bit).
Language support at the current time is English
version operating systems with keyboard
preference set to English.
BNMC is ordered separately from the monitor
hardware. See the spares section in the
Specifications portion of this datasheet for the
part number.
System_1_Evolution Connectivity
3701 monitors connect to System_1_Evolution
and support current value and time-based
data collection of all static values, waveforms,
and spectral data. This includes System 1
software's full suite of plots and tools for
conditioned monitoring and asset
management.
When an event is triggered on the 3701/4x
monitor, the following high resolution alarm
data is forwarded to System 1 *.
Trended Measurements:
Duration Intervals
Pre-event
Data
20 seconds 100
Post-event
Data
1 minute 1 second
Spectrums/Waveforms:
Duration Intervals
Pre-event Data 2.5 minutes 10 seconds
Post-event Data 1 minute 10 seconds
*Requires System_1_Evolution 17.2 or
newer and Firmware release 4.1 or newer
for 3701/4x.
10 minutes 1 second
milliseconds
10 seconds 100
milliseconds
12/25
In case of network disruption between
the 3701 and System 1*, the 3701 can
store up to 512MB of Alarm data and
512MB of transient data.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
sensors can be used partially or entirely.
Applications
This section describes selected applications
where 3701 function and feature offers
particular benefits.
Dual Redundant Protection
A typical dual redundant protection only
application has these basic elements:
Non-redundant sensor points, such as XY
radial shaft vibration probes, on the
same bearing can also be split between
input modules.
l Redundant industrial protocols can
operate independently from each
processor module to automation and
control systems.
Dual Redundant Protection with a
System 1 Connection
This optional configuration operates the same
as described above but Processor Module 1
connects to System 1 using one of its Ethernet
ports. Cyber security is the key design element
that must be addressed in this configuration.
l Each processor module processes all
sensor and Keyphasor input signals and
has communication (Ethernet)
connections only to the controls and
automation system.
l Each processor is configured the same
and executes identical logic.
l Processor module 1 drives relays 1, 3, 5,
and 7. Processor module 2 drives relays 2,
4, 6, and 8. The same alarm logic is used
for each relay pair (1, 2), (3,4) etc.
l An external shutdown system connects
to relay pairs and votes 1oo2 or 2oo2
depending on application requirements.
l The dedicated protection fault relay is
driven by a protection fault in either of the
processor modules and is driven if one
processor module is removed.
l If redundant sensors are required, they
can be voted 2oo2 or 1oo2 in the 3701
processor modules.
l System configuration can be varied in a
number of ways to meet different
reliability requirements. Redundant
Radial Shaft Vibration, Axial
Position, and Casing Vibration
3701 supports the standard industry
measurements for these applications but, in
addition, users can create custom
measurements on these channels using
spectral bands, bandpass timebase
measurements, amplitude extractions, nX
measurements, integrated and nonintegrated, and rms or peak measurements.
Detection of certain mechanical, aerodynamic,
and hydraulic, faults can be enhanced by
improved measuring capability. For example,
on an axial compressor there may be
increased sub-synchronous axial vibration at
the onset of a surge condition – a bandpass
timebase measurement or synchronous
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
spectral band measurement on an axial
position probe can enhance detection of this
specific fault mode.
(A simple bandpass with an
appropriately set high pass filter
can be configured in addition.)
Roller Element Bearings
Gear Boxes
Use spectral bands to focus on bearing fault
frequencies. ( nX measurements can also be
used but the spectral band allows customizing
the bandwidth to the bearing fault frequency
response whereas the nX measurement is
narrow band.)
There are many types of gear boxes with
correspondingly different vibration monitoring
needs. This short section is intended only to
highlight some particular features of the 3701
system.
Outer Race
Ball Pass
(ORBP)
Inner Race
Ball Pass
(IRBP)
Cage A spectral band using
Ball Spin 1X A spectral band using
Ball Spin 2X
A spectral band using
synchronous enveloped or
non-enveloped data can be set
around the expected ORBP
A spectral band using
synchronous enveloped or
non-enveloped data can be set
around the expected IRBP
synchronous enveloped or
non-enveloped data can be set
around the expected cage
frequency
synchronous enveloped or
non-enveloped data can be set
around the expected ball spin 1X
frequency
A spectral band using synchronous
enveloped or non-enveloped data can
be set around the expected ball spin 2X
frequency
Feature Description
Gear Mesh
(GM) 1X, 2X, or
3X
Gear Mesh Side
Bands
Enhanced
measurements
from Radial
Vibration
Proximitors
Set a synchronous spectral
band, or an nX
measurement (or both) on
the 1X, 2X, and 3X GM. For
each gear set.
If you know the
fundamental frequency of
an expected side band
based on your gear
kinemantics then you can
set a synchronous spectral
band on a specific
sideband.
For API 613 gearboxes where
XY radial vibration probes
are typically specified you
can set the GM related
spectral bands described
above as well as nX’s based
on hi and low speed shaft
Keyphasors.
Overall and
non-REB
fault
frequencies
HF band Set a spectral band using
Set one or more bandpass
measurements to look at overall
vibration at frequencies where
rotor, casing, or structural
vibrations are expected.
nX measurements can also be
used for rotor related vibration.
enveloped synchronous or
asynchronous data sources on
a broader high frequency band
to detect low level impact
events.
Enhanced
measurements
from Thrust
Position
Proximitors
For API 613 gearboxes where
axial position probes are
typically specified. Axial
vibration can be measured
by setting bandpass filtered
or nX measurements in
addition to the conventional
thrust position
measurement.
Gas Turbine Combustion Dynamic
Pressure
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Spectral bands and/or amplitude extractions
as well as bandpass filtered timebase
measurements can be configured to selectively
monitor the different tones produced by
pressure pulsations in combustion turbines.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Specifications
3701/40 Monitor Power
Requirements
Input Voltage
Minimum 18 Vdc
Maximum 36 Vdc
Non-isolated 24 Vdc
nominal
Current
(Simplex) 2.3 amps
max current
(Duplex) 3.0 amps
max current
Inrush Current
3.0 amps max inrush less than 5 mS (Per
processor card)
Supply must be 2006/95/EC Low Voltage
Directive compliant for CE installations.
Two
Independent
Ethernet
ports
Buffered
Signal
Outputs
LEDs
Module OK
LED
Protection
Fault LED
User Inhibit
LED
Attention
LED
Danger LED
Alert LED
Net A: 10/100 BaseT
Net B: 10/100 BaseT
15 pin DSUB connector,
available accessory cable for
BNC and SMC options.
550 ohm output impedance
Indicates when the module is
functioning properly.
Indicates that the monitor has
experienced a fault that is
affecting protection.
Indicates that there has been a
user initiated inhibit of
alarming functionality.
Indicates a condition on the
monitor has occurred that
may require action.
Indicates a Danger condition.
Indicates and Alert condition.
Supply must be Class I, Div 2 or Class I,
Zone 2, (CL2 SELV), compliant for
hazardous area Installations.
3701/40 Processor Module
Specifications
Inputs
Maximum 12 dynamic signals and 2
Keyphasor/speed signals
Signal/Noise
Ratio
A/D
Conversion
Bandwidth 0.0625Hz to 40Khz
Outputs
110db @ 102.4 ksps
Sigma- Delta 24 bit.
KPH 1 OK LED Indicates that Keyphasor
signal 1 is triggering
KPH 2 OK LED Indicates that Keyphasor
signal 2 is triggering
NetA Indicates that Network A has a
valid link
TX/RX A Indicates that network traffic is
flowing on Network A.
Net B Indicates that Network B has a
valid link.
TX/RX B
PWR 1 OK Indicates that the first power
PWR 2 OK
Indicates that network traffic is
flowing on Network B.
input is functioning correctly.
Indicates that the second
power input is functioning
correctly.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Accuracy
Direct pk
or rms
Bias
Tracking
filters
Within ± 0.5% of full-scale typical
1.1% Worst Case
+0.4 V / -0.8 V typical
+0.8V / -1.34 V Worst Case.
nX tracking filters are have a
bandwidth of 0.075X, where X is
the speed of the associated
speed channel.
Alarming
Setpoints Over/under user configurable.
Time
Delay
Latching User configurable alarming or
100mS – 60 minutes
relay latching
Input Impedance
Gap
Phase Accuracy
Dedicated Speed
Input
Auxiliary
Proximitor Speed
Input
Auto Threshold Use for any input above 1
Manual Threshold ±150mV, User selectable
Hysteresis User selectable from 0.2 to
Signal Amplitude Minimum signal amplitude
Refer to Hazardous Area Special
Considerations Section for Maximum
Magnetic Pickup amplitude
requirements for hazardous area
applications.
±8.2 mV typical
±22.3 mV Worst Case
± 1 degree up to 120,000
rpm
± 1 degree up to 10,000 RPM
rpm for 1 event/resolution
from +3.5 to -23.5 Vdc.
10 volts.
for trigger is 2 volts peakto-peak.
All 3-wire Inputs
(PAS & PAV)
2-Wire Input – PAS
(Seismaprobes)
2-Wire Input – PAV
(Velomitors)
Nominal input
impedance is 10 kΩ.
Nominal differential input
impedance is 9.98 kΩ.
Nominal constant
current is 3.3267 mA.
Speed Signal Inputs
Speed Range
Dedicated
Speed/Keyphasor
Input
Auxiliary
Proximitor
Keyphasor Input
Conditioned
Speed/Keyphasor
Input
Speed Resolution
1 to 120,000 rpm
1 to 10,000 rpm
1 to 120,000 rpm
1 to 100 rpm ± 0.1 rpm
100 to 2000 rpm ± 1 rpm
Relay Output Specifications
Relay Type
Contact
Ratings
Minimum
Switching
Current
Normally DeEnergized
(NDE) or
Normally
Energized
(NE)
Single Pole Double Throw (SPDT).
Normally Open (NO), Normally
Closed (NC), and Armature (ARM)
contacts
5A/250 Vac/1500 VA Max.
5A/250 Vdc/150 VA Max.
12Vdc/100mA
NDE/NE independently
selectable for relay pairs 1-2, 34, 5-6 and 7-8.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Refer to Hazardous Area Special
Considerations Section for Relay
specifications when used in hazardous
area applications.
3701/40 Environmental
Specifications
Indoor Use Only
Operating
Temperature
Range
Storage
Temperature
Range
-30° C to +65° C†
(-22° F to 149° F)
†
If the 3701 is operated 100% at
+65C, its life will be reduced to
approximately 11 years. Any
portion of the time it is
operated below +65C or any
convective airflow will increase
its lifespan.
-40°C to +85°C
(-40° F to 185° F)
Simplex Weight
Duplex Base
Dimensions
Duplex Weight
(fully loaded)
Mounting
(Simplex and
Duplex)
4.5 kg (9.9 lbs)
26.7 x 27.7 x 18.2 cm (10.5 x
10.9 x 7.15 in)
7.7 kg (17.1 lbs)
Bulkhead 4 mounting bolts
or screws at corners.
Relative
Humidity
Vibration
Shock
Altitude < 2000 m (6,562 ft)
Pollution
Degree
Installation
Category
0% to 95% rH non-condensing
Operating and Storage
5g @ 57-500 Hz.
IEC 60068-2-6
15g, 11ms
IEC 60068-2-27
Pollution Degree 2
Category II
Physical
Simplex Base
Dimensions
26.7 x 20 x 18.2 cm (10.5 x
7.87 x 7.15 in)
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
l 2015 Steel Vessels Rules
l 2015 Offshore units and Structures
Compliance and Certifications
FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
l This device may not cause harmful
interference.
l This device must accept any
interference received, including
interference that may cause
undesired operation.
EMC
EN 61000-6-2
EN 61000-6-4
EMC Directive 2014/30/EU
Electrical Safety
EN 61010-1
LV Directive 2014/35/EU
RoHS
RoHS Directive 2011/65/EU
ATEX
EN 60079-0
EN 60079-15
ATEX Directive 2014/34/EU
Cyber Security
Achilles Communications Certification
Level 1
Maritime
ABS 2009 Steel Vessels Rules
1-1-4/7.7,4-8-3/1.11.1,4-9-7/13
Complies with ABS Rules for Condition of
Classification, Part 1
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
contact with the internal earth
Hazardous Area Approvals
For the detailed listing of country and
product specific approvals, refer to the
Approvals Quick Reference Guide
(108M1756) available from
www.Bently.com.
connection facility on the equipment.
l The relay output circuits shall not be
connected to circuits which exceed 30V,
5A.
CSA/NRTL/C
Class I, Zone 2: AEx nA nC IIC T4 Gc;
Class I, Zone 2: AEx ec nC IIC T4 Gc;
Class I, Division 2, Groups A, B, C, and D;
T4 @ Ta= -30˚C to +65˚C
When installed per drawing 100M1872
ATEX/IECEx
II 3 G
Ex nA nC IIC T4 Gc
T4 @ Ta= -30˚C to +65˚C
ATEX Special Conditions of Safe Use
l The equipment shall only be used in an
area of not more than pollution degree 2,
as defined in IEC 60664-1.
l The equipment shall be installed in an
enclosure that provides a degree of
protection of not less than IP54 and
which meets the enclosure requirements
of EN 60079-0 and EN 60079-7/EN 60079-
15. The enclosure shall be suitable for an
ambient temperature range of -30°C to
+65°C and a service temperature of 80°C.
l Transient voltage protection shall be
provided by the external circuits to
ensure that transient overvoltages to the
equpment cannot exceed 140% of 85 V.
l When installed in a metal enclosure, the
enclosure shall have an external facitlity
for an earth bonding connection which
complies with EN 60079-0:2012/A11:2013
clause 15.1.2 and which is electrically in
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Ordering Information
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.
3701/40–AA-BB-CC-DD-EE
A: Redundancy
01
02
B: Input Module 1
00 None
01 Prox/Accel/Velom
02 Prox/Accel/Seismoprobe
03
C: Input Module 2
00 None
01 Prox/Accel/Velom
Simplex
Duplex
Positive Voltage Module
Spares
Part Number Description
3701/40 3701/40 Machinery Dynamics
Monitor
177896-05
177988-01 Prox Accel Seismic (PAS)
177989-01 Prox Accel Velom (PAV)
105M6001-01 Positive Input (PoV) Module
177897-01
175794 3701 Simplex Terminal Base
177992-01
178372-01
100M9465-01
3701/40 Processor Module
Module
Module
3701 Output Relay Module
3701 Terminal Block –
Standard
3701 Terminal Block - Duplex
Bently Nevada Monitor
Configuration (BNMC) SW
DVD
02 Prox/Accel/Seismoprobe
04
D: Output Module
00 None
01 8 CH SPDT Relay Module
E: Approvals
00 None (This does include the non-
01
02
XX Country specific
Positive Voltage Module
Hazardous area general safety
certification)
CSA
ATEX/IECEx
Accessories
Part Number Description
323314-01
323314-02
324343 Nema 4 Weatherproof
Bently_
Manuals
Buffered Output cable 15 pin
D-Sub to 7 SMA connectors.
(SMA connectors work with
the ADRE 408)
Buffered Output cable 15 pin
D-Sub to 7 BNC connectors
Housing Kit
Customer DVD containing all
Bently Manuals, FWD, App
Notes, and Install Guides in all
available languages.
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Graphs and Figures
1. Processor Module
2. Input Module 1
3. Input Module 2
4. Output Module
5. Terminal Base
Figure 1: 3701/40 Simplex Terminal Base Top View
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
1. Processor Module (2)
2. Input Module 1
3. Input Module 2
4. Output Module
5. Terminal Base
Figure 2: 3701/40 Duplex Terminal Base Top View
Figure 3: 3701/40 Simplex Terminal Base Side View
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Figure 4: 3701/40 Duplex Terminal Base Side View
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3701/40 ADAPT Machinery Dynamics Monitor
Datasheet 103M2037 Rev. J
Copyright 2020 Baker Hughes Company. All rights reserved.
Bently Nevada, Orbit Logo, ADAPT, System 1, Keyphasor, Proximitor and Velomitor are registered trademarks of Bently
Nevada, a Baker Hughes Business, in the United States and other countries. The Baker Hughes logo is a trademark of
Baker Hughes Company. All other product and company names are trademarks of their respective holders. Use of
the trademarks does not imply any affiliation with or endorsement by the respective holders.
Baker Hughes provides this information on an “as is” basis for general information purposes. Baker Hughes does not
make any representation as to the accuracy or completeness of the information and makes no warranties of any
kind, specific, implied or oral, to the fullest extent permissible by law, including those of merchantability and fitness
for a particular purpose or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect,
consequential or special damages, claims for lost profits, or third party claims arising from the use of the
information, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to make
changes in specifications and features shown herein, or discontinue the product described at any time without
notice or obligation. Contact your Baker Hughes representative for the most current information.
The information contained in this document is the property of BakerHughes and its affiliates; and is subject to
change without prior notice. It is being supplied as a service to our customers and may not be altered or its content
repackaged without the express written consent of Baker Hughes. This product or associated products may be
covered by one or more patents. See Bently.com/legal.
1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 or 1.800.227.5514 (US only)
Bently.com
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