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.

The evolution of our accelerometer sensors, velocity-sensing tools, pressure sensors,
and vibration sensors can be traced back to our velocity sensors.
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.
The ADAPT ESD system can drive 12 independent trip relays. Of the 12 relays,
six of these signals can optionally be configured for two-out-of-three, (2oo3), voting.
In the 2oo3 arrangement, the 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 the corresponding
output card. For the highest safety, the system should be configured in “de energize
to trip”, or “normally energized” mode so that loss of power will not result in a machine
running unmonitored.
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