Bently Nevada 3701/55 ADAPT (ESD) Emergency Shutdown Device

Description

The 3701/55 Emergency Shutdown Device, (ADAPT ESD) is a safety PLC

with a graphical logic programming interface and integrated overspeed detection.

ADAPT ESD is designed for emergency shutdown of rotating machinery such as

steam, gas, and hydro turbines, expanders, and other process equipment.

ADAPT ESD is a compact, standalone, triple-redundant, safety shutdown device

that is designed to meet a broad range of user scenarios and applications.

The design offers an electrical 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 the array 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

and requirements. 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 Bently Nevada Monitor Configuration software provides a

graphical interface to configure relay logic. The state of each relay is determined

by the system inputs and configured 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 and independent 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 through the Monitor Configuration software.

Compliance

The 3701/55 ESD complies with most applicable technical regulations and standards.

• North American general safety, CSA certified

• CE, Low Voltage and Electro-Magnetic Compatibility

• Functional Safety certification (SIL)

• CE, Machinery Directive

• North American, Hazardous Area certification, CSA certified

• European ATEX and IECEx Hazardous Area certification pending