Emerson Rosemount 3490 Series Reference Manual page 110

Getting started
January 2021
Fault mode relay
Menu
Fault relays de-energize when a particular fault condition exists. Parameter D831 shows a
list of active faults.
Table 4-14: Fault Mode Relay Parameters
Parameter
P560
P561
P562
P563
Note
Faults can be indicated using the output current if the Current or Both options are
selected.
Related information
Control unit reporting of alarms and faults
Set-up the current output
PV limits mode relay
Menu
This relay mode uses the relay On Point and Off Points (e.g. P411 and P412) as high and
low limit alarms for the control unit PV value (D800). The points can be in any order of
value.
The relay is energized while the PV value exceeds the higher limit point value or while it is
below the lower limit point value.
Rate of change mode relay
Menu
A rate of change value for the control unit PV value (D800) is calculated every 5 seconds in
units of PV per minute:
110
SETUP → [CONTROLLER] → OUTPUT → FAULT
Description
System Fault Fault relay de-energizes while there is a control unit
fault and the option is Both or Relay.
CU Temp Fault Fault relay de-energizes while the CPU temperature
rises above 65 °C and the option is Both or Relay.
Read-only parameter D844 shows the live
temperature reading.
Xmtr Fault Fault relay de-energizes while a HART transmitter
signals a fault and the option is Both or Relay.
Digital Input Fault relay de-energizes while digital input IN1 or IN2
is triggered and the option is Both or Relay.
See Digital inputs IN1 and IN2
Fault action required for this feature.
SETUP → [CONTROLLER] → OUTPUT → RELAY → RELAY 1, RELAY 2, etc.
SETUP → [CONTROLLER] → OUTPUT → RELAY → RELAY 1, RELAY 2, etc. and
MONITOR → [CONTROLLER] → READINGS → Rate of Change
Reference Manual
00809-0100-4841
Factory default
Both
None
None
None
for how to select the
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