Reference Manual
00809-0100-4841, Rev. AA
May 2007
4-59
Rosemount 3490 Series
About Alarms Alarms
The 3490 Series Control Unit can detect the following alarm conditions:
• PV value out-of-limits.
• Current Output saturated
(Standard:
≤ 3.9mA or ≥ 20.8mA, NAMUR NE43: ≤ 3.8mA or ≥ 20.5mA)
• Logging memory filling (model 3493 only).
• Logging memory full (model 3493 only).
• 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 (models 3491 and 3492 only).
• Relay inactivity.
Parameter D830 shows a list of active alarms. In addition, alarms are
indicated by means of Relays, Current Output, or both (see below).
Table 4-15 on page 4-62 has a summary of reporting methods for alarms.
Alarm indication selection
For each alarm listed in Section “Alarms“ on page 4-60, there is a dedicated
parameter in the ALARM menu for selecting the method of indication for that
alarm.
Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / ALARM
P540 PV Over Limits (Factory default is "None")
Select the indication method for the alarm condition that occurs if the PV
value is outside pre-set limits.
See also Section “PV limits Relay“ on page 4-53.
P541 mA Out Sat (Factory default is "None")
Select the indication method for the alarm condition that occurs if the
Current Output is
≤ 3.8mA or ≥ 20.5mA
P542 Log mem filling (Factory default is "None")
Select the indication method for the alarm condition that occurs if the
available logging memory is low. See also Section “P593: Low Memory
Alarm“ on page 4-35.
P543 Digital Input (Factory default is "None")
Select the indication method for the alarm condition that only occurs if a digital
input is configured to force this alarm and that digital input is active - see
Section “Digital Inputs IN1 and IN2“ on page 4-34.
P544 Max retries (Factory default is "None")
Select the indication method for the alarm condition that only occurs if a
Custom relay operation is unable to complete as specified, even after a
pre-set number of attempts (P257). See also Section “Custom“ on page 4-55.
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