Honeywell SmartLine Multivariable SMV800 Series User Manual page 98

Group Parameter
Failsafe,
Reverse Temperature
Flow, failsafe
Simulation
Page 86
Values
SMV800 Series HART/DE Option User's Manual
Description
Check this if flow output is required
to go to failsafe when there is a
Temperature failure. If failsafe is
not required, Uncheck this to use
the Nominal or Design Temperature
values in flow calculations when
there is a Temperature failure. All
Fluids, Dynamic Algorithms and
Liquid Standard Algorithms use
Nominal temperature. All Standard
Gas Algorithms use Design
temperature. Standard Steam
algorithms use Design Density.
Design Temperature is set to 1.
If the flow output is required to go to
failsafe when there is a temperature
failure, selecting Temperature
Failsafe (PV2 Failsafe) will assure
this.
If failsafe for the flow output is not
needed when a temperature sensor
fails, the nominal or design values
for temperature are used in the flow
calculation and the flow rate
continues to be reported. Some use
cases are listed below.
Case1: This switch On or OFF:
When PV3 is mapped to Output,
and when PV3 goes bad, device
always goes to burnout.
PV3 Process Input: If the PV3 input
becomes good, device needs a
power cycle to return to normal if
Critical Status Latching is ON.
PV3 Process Input: If the PV3 input
becomes good, device returns to
normal without power cycle if
Critical Status Latching is OFF.
PV3 Sim Input: If the PV3 input
becomes good, device returns to
normal without a power cycle
whether Latching is ON or OFF.
Case 2: This Switch ON: When
PV4 is mapped to output, bad PV3
makes PV4 bad and device goes to
burnout.
Revision 6.0