Bently Nevada 3701/55 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.