8
SafeGuard Controller User Manual
MAN-0115 Rev 0
2.2.1
CHANNEL SETUP ENTRY MENU
The
entry menu
shown on the left side of Figure 2.1 allows access to all configuration
variables for the selected channel. These are
Alarm 1
,
Alarm 2
,
Alarm 3
,
Data
From?
Linearize
,
Configure
and
Calibrate
.
2.2.2
ALARM 1 / ALARM 2 / HORN RELAY SET-UP MENU
Alarms 1 and 2 are identical except A1 may not be
acknowledged
and front panel LED
indicators are yellow while A2’s are red. Since their configuration menus are the same
only one is shown in Figure 2.2 for clarity.
Figure 2.2
The first entry determines the
Setpoint
value where the alarm trips. It is entered in
engineering units. For example, if a channel monitors 0-50 ppmH2S and the alarm must
trip at 10 ppm, the correct entry is 10.00.
•
Latching
determines either manual or automatic alarm reset operation.
YES
requires a manual
Alarm Reset
(see Figure 1) to unlatch the alarm even though an
alarm condition no longer exists.
YES
also causes this alarm group’s common relay,
front panel LED, and optional discrete relay to latch.
NO
allows all outputs for this
alarm to automatically reset as soon as the alarm condition clears.
•
TRIP ON
is set to
HIGH
for increasing alarms or
LOW
for decreasing alarms to
determine if the alarm activates upon exceeding or falling below the setpoint.
•
The
ON DELAY / OFF DELAY
entries allow
ON
and
OFF
time delays affecting
how long the setpoint must be surpassed before an alarm event transition occurs.
ON
delays are limited to 10 seconds while
OFF
delays may be as long as 120 minutes.
Delays are useful in many applications to prevent nuisance alarms and unwanted
cycling into and out of alarm conditions.
Note:
For
ON DELAY
the alarm is activated after the ‘set time’ is reached. For
OFF
DELAY
the alarm remains activated for the duration of the ‘set time’, after the alarm
condition has passed.
•
The
HORN ON
entry allows linking this alarm to the common horn relay.
NO
causes the alarm to have no effect upon the horn relay. Entering
YES
causes this
alarm to turn the horn relay on steady, or, to pulse it depending upon horn
configuration in the system menu (see section 2.3.3).
Discrete LED indicators on the front panel indicate the status of each alarm and relay.
Any
new
alarm event causes the associated LED to flash until
Alarm Reset
occurs
