Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
4-60
P545 mA In Sat (Factory default is "None")
Select the indication method for the alarm condition that occurs if the Current
Input is
≤ 3.7mA or ≥ 20.75mA.
P547 Rising Level (Factory default is "None")
Select the indication method for the alarm condition that occurs if the PV
value is increasing (or decreasing) at a rate that exceeds is a programmed
threshold. See also Section “Rising Level Alarm“ on page 4-57.
P548 RL Operations (Factory default is "None")
Select the indication method for the alarm condition that occurs if a relay
operation counter exceeds a pre-set limit.
See also Section “Relay Operations Alarm“ on page 4-56.
P549 RL runtime (Factory default is "None")
Select the indication method for the alarm condition that occurs if a relay is
energised for longer than a pre-set period.
See also Section “Relay Run Time Alarm“ on page 4-56.
P550 Pump efficiency (Factory default is "None")
On models 3491/3492 only. Select the indication method for the alarm
condition that occurs if the calculated pump efficiency falls below a pre-set
limit. See also Section “Pump Efficiency Alarm (Models 3491 and 3492 only)“
on page 4-57.
P531 No activity (Factory default is "None")
Select the indication method for the alarm condition that occurs if any
selected relay is de-energised for longer than a pre-set period. See also
Section “No Activity Alarm“ on page 4-57.
Options for parameters P540 to P551 are:
• None - if the alarm will not to be indicated
• Both - alarm indicated by Relay Output (see below) and Current Output
• Current - alarm will be indicated by the Current Output
• Relay - alarm will be indicated by Relay Output (see below)
If the indication method for a particular alarm is a Relay Output (e.g. RL1), the
mode of a relay (e.g. P411) must first be set to the "Alarm" option. After this is
set-up, all 'Alarm duty' relays are energised while the alarm condition exists.
When there is no alarm condition (or the alarm condition has ceased), 'Alarm
duty' relays are de-energised.
More than one Relay Output can be allocated to alarm duty, if required. On
the primary display, the relay status icon shows an "A" if it is allocated to alarm
duty and the relay is energised.
(For information on relays, see also “Relays“ on page 4-40.)
If the indication method is the Current Output, parameter P402 is used to
determine how the Current Output will indicate an alarm condition - see
Section “Current Output“ on page 4-39 for alarm action options.
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