3701/55 ADAPT (ESD) Emergency
Shutdown Device
Datasheet

Bently Nevada Machinery Condition Monitoring

100M8833 Rev. J

Description
The 3701/55 Emergency Shutdown Device, (ADAPT ESD) is asafety PLC with a graphical logic programming interface andintegrated overspeed detection. ADAPT ESD is designed for
emergency shutdown of rotating machinery such as steam,gas, and hydro turbines, expanders, and other processequipment.
ADAPT ESD is a compact, standalone, triple-redundant, safety
shutdown device that is designed to meet a broad range ofuser scenarios and applications. The design offers anelectrical and mechanical package with attention toreliability and availability as well as extensive self-diagnostics
and compliance to industry standards.

Inputs
Inputs to the system are processed using three CPU modules
to provide triple modular redundancy (TMR). Each CPU
processing module processes two unique speed input
channels, for a total of six speed channels for the system. The
processing modules also monitor an array of 32 discrete (DI)and process variable (PV) signal inputs. Twelve channels of
this input signal array may be configured either as discrete
inputs or 4-20 mA analog inputs. Remaining channels in thearray are reserved for discrete input signals only.

Outputs
Machinery shutdown functionality of the 3701/55 ADAPT ESD
system is actuated by TMR relay output modules. Each relay
output module has five relays with a level of configurability
that accommodates a variety of applications andrequirements. Four of the five relays in each module are used
to annunciate system logic. The remaining relay reflects the
OK/NOTOK status of the associated protection path. The

3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

system activates a relay only when any two of
the three CPU modules drive to trip. In
independent mode, or one-out-of-one voting,
any single CPU that drives to trip will cause an
assigned relay to activate on thecorresponding output card. For the highest
safety, the system should be configured in “deenergize to trip”, or “normally energized” modeso that loss of power will not result in a machinerunning unmonitored.

Bently Nevada Monitor Configuration software
provides a graphical interface to configure
relay logic. The state of each relay isdetermined by the system inputs andconfigured system logic in conjunction with thecontrol state of the relay. Relay control states
depend on the application, and may be set as
normally energized/de-energized andindependent one-out-of-one, (1oo1), voting or
TMR two-out-of-three, (2oo3), voting. Each CPU
module in the system has two, internally
powered, 4-20 mA recorder outputs controlled
by the full-scale speed set by the user throughthe Monitor Configuration software.

ADAPT ESD Processing Module(CPU)

Compliance

The ADAPT ESD system has three CPU modules.
The CPU (part number 323174-01) is a state-ofthe-art, high-performance CPU module. All
three CPU modules process all 32 discrete
inputs and 12 analog inputs. Each individual
CPU module processes two speed inputs, for a
total of six speed inputs. The CPU modulefeatures redundant Ethernet connections. The
CPU receives trip logic configuration from the
Bently Nevada Monitor Configuration software.
The trip logic can have up to 500 logic steps.
The input-to-output decision time is optimized
to provide 2ms nominal logic processing timeand 8ms relay toggle time in order to minimize
the overall duration between detection of an
emergency condition and successful
shutdown. All embedded code on the CPU iscapable of being upgraded without
disassembly of the system.

The 3701/55 ESD complies with most applicabletechnical regulations and standards.
llNorth American general safety, CSA
certified
CE, Low Voltage and Electro-Magnetic
CompatibilitylFunctional Safety certification (SIL)l

CE, Machinery DirectivellNorth American, Hazardous Area
certification, CSA certified
European ATEX and IECEx Hazardous Area
certification pending

3701 ADAPT ESD Overview

ADAPT ESD Relay Module

Typical (and recommended) applications of
the ADAPT ESD will use a triple modular
redundant architecture. In this configuration,
each processor module physically connects toan array of 32 input channels, 12 of which areconfigurable as discrete inputs or 4-20 mA
analog inputs, as well as two speed inputs. The
Bently Nevada Monitor Configuration software
allows you to configure large combinations oflogic blocks in order to manage the system trip
logic. This logic dictates how the trip
mechanisms for the system are driven. The
ADAPT ESD system can drive 12 independent trip
relays. Of the 12 relays, six of these signals canoptionally be configured for two-out-of-three,(2oo3), voting. In the 2oo3 arrangement, theThere are three relay modules in each ESD
system. Each Relay Module (part number
323073-01) has five relay contacts. Two of therelays are independent relays, driven by acorresponding CPU module. The remaining two
relays are configurable as either independentor 2oo3 voted. When using a 2oo3 mechanicaltrip assembly, a typical installation would
involve a series connection of one independent
relay from each of the three relay modules.
Each of the three CPUs would independently
drive relays on each of the three relay cards.
When two of the three CPUs drive for trip, thetrip assembly would have the inputs it needs toactuate the safety mechanism. Alternately,

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

2oo3 relays can be implemented directly on
the ESD system. The remaining fifth relay is a
protection fault relay used to convey the overall
health/status of the system. The ADAPT ESD
system drives the protection fault relay tobroadcast a condition has compromised theintegrity of the system.

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

Networking Overview
The 3701/55 ADAPT ESD system supports fixed(static) IP addressing as well as DHCP. You caneasily use the Bently Nevada Monitor
Configuration software to set the system toany static IP address or set for DHCP. The
system has 6 physical network interfaces inorder to provide 2 interfaces per CPU module.
The system should be configured so that each
CPU module is connected to a single subnet
through one of the available interfaces. For
redundant communications, the second set ofthree interfaces can be utilized, and should be
configured for a separate subnet.

Computer Requirements
Bently Nevada Monitor Configuration software
will run on most Windows desktop or notebook
computer systems. Bently Nevada Monitor
Configuration software is designed to run andfully tested on Microsoft Windows 7. Software
operation is also verified for operation in 32-bit
or 64-bit environments.

Networking Requirements
Bently Nevada Monitor Configuration software
requires Ethernet ports with TCP/IP protocol
support to communicate with the 3701/55
ADAPT ESD. The dual ports on each CPU module
should be configured for separate subnets tosuccessfully implement redundant data
pathways when this feature is available.
Bandwidth sharing on any network, dependingon traffic, is always a consideration and willaffect network performance. Ensure that you
have installed all networking hardware andconfigured the hardware according to yournetwork administrator’s specifications.

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

Closed State
Impedance

Specifications
Typical specifications are provided for atemperature of +25 °C ± 3°C (+77°F ± 5.4°F). Allother specifications are over the operating
temperature range of -30°C to +65°C (-22°F to+149°F).

Communication
Ethernet - 6 Ports

10/100 Mbps

ProtocolTCP/IP

Addressing

DHCP and Static IP

Compatible

LAN/WAN

Configuration
Modification

Password Protected

Time Synchronization

NTP

18 - 36 Vdc Voltage

Power Consumption

24 W Typical/
35 W Maximum

For Hazardous Area installations, thesupply must be appropriately
certified to the local national
standards. Refer to Hazardous Area
Directives section for power supply
requirements in hazardous area
applications.

187 KΩ Minimum

Low Voltage Input

1.2 Vdc Maximum forexternally wetted signals

High Voltage Input

2.9 Vdc Minimum forexternally wetted signals

Internal Wetting
Voltage

10 - 15 Vdc

Input Resistance

150 KΩ TypicalFaulted Input
Tolerance±40 V

Full Scale Range

4-20 mA ±1%

Polarized
Terminals

Pos ‘B’/Neg ‘A’

Typical Operating
Frequency

0-159 Hz

Common Mode
Input Range±32 V

Differential Input
Range

0-25 mA

Faulted Input
Tolerance±40 V

The 3701/55 Overspeed Protection
Module will support from 1 to 999
events per revolution with amaximum full-scale range of 1,20,000rpm and a maximum input frequencyof 20 kHz (1EPR).

Refer to Bently Nevada Application
Note 013 for instruction about
connecting the system and power
supply to earth ground.

Signal Input Specifications

Proximity Speed Inputs

Discrete Inputs
Two-Terminal,
Dry Contact

Open State
Impedance

Analog Inputs

Power Requirements
Input Range

57 KΩ Maximum

Auto Threshold and Hysteresis
Polarity Independent A/B
Terminals for dry
contacts

Input Voltage
Range

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0 to -24Vdc

3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

Transducer
Power Supply
Typical-24Vdc (-23.5Vdc to 24.75Vdc
over operating range)

Max
Transducer
Current

30mA with current fold-backprotection

Operating
Frequency

3Hz – 10kHz

100M8833 Rev. J

Amplitude
Operating
Frequency

2 Hz – 20 kHz

Error+/-0.1 RPM Below 100 RPM+/-1.0 RPM Below 10k RPM+/-0.01% FSR >10k RPM

OK Checking

0 to 30k Ohms OK
Above 30k Ohms Not OK

Minimum Pulse
1.0 Vpp
Amplitude
Maximum
Pulse
Amplitude

24 VppError+/-0.1 RPM Below 100RPM+/-1.0 RPM Below 10kRPM+/-0.01% FSR >10kRPM

OK Checking-17Vdc to –1.5Vdc OK Typical
Above -1.5Vdc NOT OK
TypicalBelow -17Vdc NOT OK Typical

Minimum input frequency formagnetic is 3Hz (180 rpm for 1
event/revolution & 0.18 rpm for 999
event/revolution). The minimum peak
to peak signal amplitude formagnetic speed input of the 3701/55
is 1.5V.
System Control Contacts
Lock Config/Test Modes
Reset Alarms

Minimum input frequency forproximity transducers is 3Hz (180 rpm
for 1 event/revolution & 0.18 rpm for999 event/revolution). The minimum
peak to peak signal amplitude forproximitor speed input of the 3701/55
is 1V. Refer to the table in Appendix on
speed signal requirements forminimum (pk to pk) amplitude ofsignal for different speeds and duty
cycles.

Reset Password and IP Address

Relay Output Specifications
CH 1/2 Relay Contacts
Independent 1oo1 Voting or
TMR 2oo3 Voting

SPDT

Single Pole-Double Throw

5A/250 Vac/1500 VA Maximum
5A/250 Vdc/150 VA Maximum

Refer to Bently Nevada Application
Note 085 for instruction on proximity
probe installation.
Magnetic Pickup Speed Inputs

Available
Contacts

Normally Open or Normally
ClosedConfigurable
Trip

Energize or De-energize

Nominal
8ms
Transition Time

Auto Threshold and Hysteresis
Minimum Pulse
1.0 Vpp
Amplitude
Maximum

Configurable
Voting Logic

Minimum
Switch Current

80 Vrms

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12Vdc/100mA

3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

CH 3/4 Relay Contacts
Voting Logic

Independent 1oo1 Voting
Only

SPDT

Single Pole-Double Throw

5A/250 Vac/1500 VA Maximum
5A/250 Vdc/150 VA Maximum
Available
Contacts

Normally Open or Normally
ClosedConfigurable
Trip

Energize or De-energize

Nominal
8ms
Transition Time
Minimum
Switch Current

12Vdc/100mA

Okay Relay Contact
Normally Open
De-Energize to Trip
5A/250 Vac/1500 VA Maximum
5A/250 Vdc/150 VA Maximum
SPDT

Single Pole-Double Throw

Maximum

5A/250 Vdc/150 VA

Nominal
8ms
Transition Time
Minimum
Switch Current

12Vdc/100mA

Refer to Hazardous Area Directives
section for relay requirements inhazardous area applications.

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

4-20 mA Recorder Output
Specifications

5 Hz

Multiple Channel Alarms
Activated

Internally Powered
Full Scale
Range

CPU Speed LEDs

4-20 mA

Green

Speed Signal Present

Maximum Error 0.1 mA

Off

No Speed Signal Present

Maximum
Loop
Impedance

2 Hz

Speed Signal Out of OK
Range

750 Ohm

CPU Net LEDs

LED Indicators
Module OK LED

Green

Link Present

Off

Link Not Present

Green

OK

CPU TX/RX LEDs

Off

NOTOK
(self-test failure, or input
signal out of OK range)

Blinking

Active Link

Off

Inactive Link

2 Hz

Un-configured

CPU PWR LEDs

Protection Fault LED

GreenPower Present

Red

Protection Fault Present

OffPower OffOffRun Mode

Relay OK LED

CPU Test LED
OffRun Mode (test mode
inactive)

2 Hz

Test Mode Active

Green
Off

No Entries Present in Event
List

No Channel Alarms
Activated

2 Hz

Single Channel Alarms
Activated

Off

NOTOK

2 Hz

Unconfigured

Red

Active (tripped)

Off

Inactive

2 Hz

Voltage Check Failure

Logic Configuration Specification

CPU Alarm LED
Off

OK

Relay Channel LED

CPU Attention LED
New Event List Entry Requires
Attention

Green

8/17

Maximum
Logic Blocks

500

Maximum In to
Out DecisionTime

2 ms (500 blocks w/o timer
delays)3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

Maximum
Contact
Closure Delay

100M8833 Rev. J

30 ms (detection to newrelay state)

Input Blocks
Discrete Input
Channels

Configurable inverting logic

Speed Inputs

6 high/low setpoints plus Not
OK

Analog Input
4-20 mA
Recorders

6 high/low setpoints plus Not
OK

Logic Blocks
Multiple-input AND
Multiple-input OR
Multiple-input XOR
Inverter
8-input M-out-of-N
RS Flip-Flop
Timer

Triggered on high/lowtransition, or pulse

Output Blocks
Relay Output

Configurable 1oo1 or 2oo3

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

PhysicalEnvironmental

Dimensions

OperatingTemperature-30°C to +65°C (-22°F to+149°F)

Storage
Temperature-45°C to +85°C (-49°F to+185°F)

Relative
Humidity

0% to 95% Non-condensing

Vibration

Per IEC 60068-1,
3 g @ 3-57 Hz
5 g @ 57-500 Hz

Shock

Per IEC 60068-2,
15 g for 11 mS Operational &Non-operational

ADAPT ESD
System(LxWxH)

25.4 x 30.48 x 18.0 cm(10.0 x 12.0 x 7.1 in)Processing
Module(LxWxH)

15.8 x 6.1 x 15.8 cm(6.2 x 2.4 x 6.2 in)Relay Output
Module(LxWxH)

15.8 x 2.8 x 15.8 cm(6.2 x 1 .1 x 6.2 in)Weight
ADAPT ESD
System

8.8 kg (19.4 lb)

Processing
Module1.2 kg (2.6 lb)

Relay Output
Module0.6 kg (1.3 lb)

Environmental Considerations
The ADAPT ESD is designed to meet a broad
range of use cases and environments. The
design incorporates significant measures toprovide a robust electrical and mechanicalpackage with careful attention to system
reliability, including extensive shock, vibration,and temperature exposure.

ADAPT ESD System Construction
Aluminum Chassis

That being said, the ADAPT ESD system shouldbe treated with the appropriate care, as
exposure to extreme environments will shorten
the life expectancy of the system. Exposing the
ADAPT ESD to condensing liquids, rain, sand, or
situations that impair ventilation can cause
excessive internal heating and performanceloss. For installations that may exceed
environmental specifications we can createcustom solutions to meet specific needs. For
example, although the ADAPT ESD has
hazardous area approvals, it must be in a NEMA
grade enclosure. If you have any questions
regarding an application, please contact yourlocal sales and service representative.

Cast Aluminum Module Cases
Black Powder Coat Finish (indoor/outdoor
use)

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

IEC 61508

Compliance andCertifications

For further certification and approvals
information, please visit Bently.com.
Power supplies must be 2006/95/EC
and 60950-1 compliant for CE
installations.

FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to thefollowing two conditions:ll

CE compliant installations require
relay contact voltages below 120 Vac,or 50 Vdc to minimize shock hazard.

This device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

EMC
EU Directive 2014/30/EU
EU 61326-3-1
EN 61000-6-2
EN 61000-6-4

Electrical Safety
CAN/CSA-C22.2 No. 61010-1-12
UL 61010-1
EU Directive 2014/35/EU Low Voltage
Directive
EN 61010-1

RoHS
RoHS Directive 2011/65/EU

Maritime
ABS 2009 Steel Vessels Rules
1-1-4/7.7,4-8-3/1.11.1,4-9-7/13

Safety of Machinery
EU Directive 2006/42/EC, Machinery
Directive
Safety Related Electronic Control
Systems,
IEC 62061-1

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. JlHazardous Area Approvals

Certified Functional Safety (SIL)
Systems

For the detailed listing of country and productspecific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.

The 3701/55 ADAPT ESD system is certified as a
SIL 3 device. The SIL 3 safety category is verified
by methods outlined by IEC 61508, Part 1-7
safety standard.

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;

SIL installations require:l

T4 @ Ta= -30˚C to +65˚C
When installed per drawing 100M1872l

ATEX/IECExll

II 3 GEx nA nC IIC T4 Gc
Ex ec nC IIC T4/T5 Gc
T4 @ Ta= -30˚C to +65˚C
The 3701/55 ADAPT ESD system is not certified for
installation in Class I Division 1, or Class I Zone 0/1
locations, but it will support transducers
installed in these locations via the use ofgalvanically isolated safety barriers or zener
barriers. If galvanic isolators are used, nochange is necessary to the installation. A
removable ground jumper allows the monitor
to support zener barrier installations. Removing
the jumper will disconnect circuit common
from chassis at the monitor so that chassis canbe connected at the barrier.
Power supplies must be Class I, Div 2
or Class I, Zone 2 compliant for
hazardous area installations.
Hazardous area installations require:lllInter-terminal base connectors toremain unused.

Relay contact voltages below 30 Vac rms,
or 30 Vdc to minimize hazard.
Relay contact amperages below 5 Amps
DC, or AC to minimize hazard.
Relay contact power below 100 Watts DC,
or 100 VA AC to minimize hazard.

12/17

Relay contact voltages below 250 Vac, or
250 Vdc.
Relay contact amperages below 1A AC or
DC.
Relay contact power below 250VA AC, or
150W DC.
Inter-terminal base connectors toremain unused.

3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

at bnTechSupport.com

Ordering Information

Bently_Manuals

For the detailed listing of country and productspecific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.

3701/55 ADAPT ESD Monitor
A: Agency Approval
00

None

01

CSA/NRTL/C
CLASS 1, DIV 2, ZONE 2

02

ATEX/IECEx

B: Relay Option
01

Standard Relay Module

02 *Gold-plated Relay Module* This relay option does not have
Hazardous Area Certifications

Accessories
289761-01

ADAPT ESD Terminal Base
Assembly

323174-01

ADAPT ESD CPU Module

323073-01

ADAPT ESD 4 Ch. Relay Output
Module323073-02

ADAPT ESD 4 Ch. Gold-plated
Relay Output Module

289036-01

Spare ADAPT ESD Terminal
Block324343

103M1345-01

ADAPT ESD Weatherproof
Enclosure

3701/55 ADAPT ESD
Configuration Software DVD
Please download this software

13/17

Customer Documentation DVD

3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

Reference Materials
Please refer to the Bently_Manuals
Customer DVD to access all
documentation noted below.

100M8433

3701/55 ADAPT ESD ProductDatasheet

100M8834

3701/55 ADAPT ESD SIL Safety
Manual

114M7576

3701/55 ADAPT ESD User Guide

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

Graphs and Figures

Figure 1: Dimensional Drawing and Enclosure Clearances.
Terminal base of the 13701/55 ESD system must be mounted vertically with power supply terminal
exiting horizontally for proper heat dissipation. Required enclosure depth minimum nine inches, (9”).

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

Appendix
Table 1: Speed Signal Requirements
Duty Cycle (%)
Period (s) Frequency (Hz)RPM

50 25 10

5

1

0.5

0.1

0.05

Minimum Amplitude V(p-p)
5

0.2

12

1

1

1

1

1

1.06

1.9

3.1

2

0.5

30

1

1

1

1

1

1.17

2.82

4.98

1

1

60

1

1

1

1

1

1.19

3.05

5.09

0.1

10

600

1

1

1

1

1.06

1.31

3.2

5.42

0.01

100

6000

1

1

1

1

1.08

1.34

3.48

5.8

0.001

1000

60000

1

1

1

1

1.31

1.86

6.11

Greater than 8V

0.00052000

120000

1

1

1

1

1.57

2.45

Greater than 8V

Greater than 8V

This table is applicable for Proximitor-based speed measurements.

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3701/55 ADAPT (ESD) Emergency Shutdown Device
Datasheet

100M8833 Rev. J

Copyright 2021 Baker Hughes Company. All rights reserved.

Bently Nevada, Adapt, Proximitor and Orbit Logo 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 ofany kind, specific, implied or oral, to the fullest extent permissible by law, including those of merchantability andfitness 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 theinformation, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to makechanges 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 Baker Hughes and its affiliates; and is subject tochange 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 becovered by one or more patents. See Bently.com/legal.

1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 (US) or Bently.com/support
Bently.com

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