User manual

SEC-HD user manual Programming the parameters
35
Programming alarm settings, parameters 15 and 16
There are four alarms. For a more-detailed description of how all settings work together, read
Understanding how the SEC-HD operates on page 26.
 High temperature
 Low temperature
 Probe damage
 Power fail
The alarm settings for your SEC-HD determine which alarm conditions are enabled, which are
disabled, and their settings. All these work together to determine how and when the alarm relay
activates (in other words, signals an alarm condition).
The alarm relay activates if an enabled alarm condition is present for longer than the minimum
duration of one minute. The one-minute minimum duration prevents alarms from occurring when
the temperature rises or drops for just a few seconds.
For example, the high temperature alarm setting is 85.0°F. If the temperature rises to 86 degrees, but
drops below 85 degrees 30 seconds later, the alarm relay does not activate. If the temperature rises
to 86 degrees and stays there for more than 1 minute, the alarm relay activates. The alarm relay
remains activated until the temperature drops below the alarm setting.
The exception to the one-minute minimum is the power fail alarm. The power fail alarm
automatically triggers the relay on a loss of power.
 When an alarm occurs, the Alarm LED switches on and the alarm message
displays. For more information about acknowledging and responding to alarms,
read Acknowledging alarms on page 39.
 Use temperature override to test your high and low temperature alarms instead
of adjusting the group set point. In temperature override mode, the alarm relay
and status LEDs both operate as if they were in a real alarm situation. For more
information, read Using temperature override mode on page 41.
 Use the Alarm settings worksheet on page 58 when programming alarms.
To program high and low temperature alarm settings
The examples in the following procedure use program A. Program A displays as
a
pr
, program B displays as
b p r
, program C displays as
C p r
, and program D
displays as
d p r
.