Emerson Rosemount 3490 Series Reference Manual page 121

Reference Manual
00809-0100-4841
4.4.14 Set-up alarms
Alarms
The control unit can detect the following alarm conditions:
• Control unit PV is out-of-limits
• Current Output saturated
(Standard: ≤ 3.9mA or ≥ 20.8mA, NAMUR NE43: ≤ 3.8mA or ≥ 20.5mA)
• Logging memory filling (Rosemount 3493)
• Logging memory full (Rosemount 3493)
• Digital input is configured to force an alarm when active
• Maximum number of failed Custom relay operation attempts
• Current Input saturated
• Rising liquid level
• Relay operation count limit exceeded
• Relay run time limit exceeded
• Low pump efficiency (Rosemount 3491 and Rosemount 3492 only)
• Relay inactivity
Parameter D830 shows a list of active alarms. Alarms are indicated using relay outputs and
the current output.
Related information
Control unit reporting of alarms and faults
Alarm indication selection
Menu
For each alarm, there is a dedicated parameter in the ALARM menu for selecting the
method of indication for that alarm. Options for parameters P540 to P551 are:
None
Both
Current
Relay
Parameter P402 is used to decide how the output current indicates an alarm condition.
Emerson.com/Rosemount
SETUP → [CONTROLLER] → OUTPUT → ALARM
If the alarm is to be indicated (default factory setting)
Alarm is indicated by an Alarm mode relay and output current
Alarm is indicated by the output current only
Alarm is indicated by an Alarm mode relay only
Getting started
January 2021
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