Bently Nevada ADAPT 3701/40 Specifications
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.
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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