Emerson Rosemount 3490 Series, Reference Manual

Page: 110 / 190

Fault mode relay
Menu
SETUP
→
[CONTROLLER]
→
OUTPUT
→
FAULT
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 Description Factory default
P560 System Fault Fault relay de-energizes while there is a control unit
fault and the option is Both or Relay. Both
P561 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. None
P562 Xmtr Fault Fault relay de-energizes while a HART transmitter
signals a fault and the option is Both or Relay. None
P563 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 for how to select the
Fault action required for this feature.
None
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 SETUP → [CONTROLLER] → OUTPUT → RELAY → RELAY 1, RELAY 2, etc.
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 SETUP
→
[CONTROLLER]
→
OUTPUT
→
RELAY
→
RELAY 1, RELAY 2, etc. and
MONITOR → [CONTROLLER] → READINGS → Rate of Change
A rate of change value for the control unit PV value (D800) is calculated every 5 seconds in
units of PV per minute:
Getting started Reference Manual
January 2021 00809-0100-4841
110 Emerson.com/Rosemount