Liebert Universal Monitor - Manual (Page 55)

System and Control Options
47
9.3.4 Set Up Alarmable Inputs in Latched or Unlatched Mode
Alarmable input points may be set up in Latched mode (Y), which
requires the user to clear the Universal Monitor alarms after an alarm
has occurred, or Unlatched mode (N), in which alarms will automati-
cally clear after a return-to-normal state. The default setting for
alarmable inputs is N (Unlatched). Any input defined as an event is
automatically Unlatched.
A digital input defined as Latched does not reset automatically after
an alarm. It will remain in the triggered position even after the moni-
tored device returns to normal. After an alarm, the user must manu-
ally reset Latched inputs, as described in 9.12.1 - Clear Active
Alarms. This also means that any digital outputs linked to a Latched
digital input will remain triggered until the input is manually reset.
A digital input defined as Unlatched will automatically track the sta-
tus of the monitored device. No action by the user is required.
• From the Setup Input Menu, choose Latched, as shown above
right, and press Enter ↵ .
• To change this feature, use the arrows ↑ ↓ to choose Y (Yes -
Latched) or N (No - Unlatched), then press Enter ↵ .
NOTE: Only alarmable input points may be set up as Latched. If you
attempt to set up an event as Latched, the message shown at right
appears. Press the ESC key to return to the previous screen to con-
tinue configuring the digital input.
The only way to reset latched alarms is by clearing active alarms. This
step is required to return latched points to their normal state. For
details, see 9.12.1 - Clear Active Alarms.
9.3.5 Set Up Delay Time
Each input may be set up with a specified time delay between the
occurrence of an alarm or event—a monitored device changes state—
and any response by the Universal Monitor. This feature can prevent
needless responses to transient conditions.
This delay is the amount of time that must elapse before the Universal
Monitor acknowledges the change of state in the monitored device and
takes any further action, such as dialing configured pagers. The
default time delay is 1 second (displayed as 00 MIN : 01 SEC).
The time delay applies only when a monitored device changes from its
normal state—for example, the Universal Monitor detects a closed
contact that is defined as Normally Open.
When the monitored device returns to its normal state, the Universal
Monitor acknowledges the change of state immediately.
• From the Setup Input Menu, choose Delay, as shown at right, and
press Enter ↵ .
• To change the time delay in minutes and seconds (in the range of 00:00 to 99:59):
• For minutes (MIN), press and hold one of the arrow keys ↑ ↓ scroll through the numbers
00-99.
• Press Enter ↵ to advance to seconds (SEC).
• For seconds (SEC), press and hold one of the arrow keys
↑ ↓ scroll through the numbers 00-59.
• When finished, press Enter ↵ again.
Setup Input Menu
SETUP INPUT_01
LABEL: INPUT_01
NORM OPEN/CLOSE: NO
ALARM/EVENT: AL
↑ ↓=NEXT ↵
=SELECT
> LATCHED: N
DELAY: 00:01
Latched / Unlatched
IS ALARM
LATCHED? N
↑ ↓=Y/N ↵
=END
Message (if input has
been defined as an event)
LATCH NOT ALLOWED
WHEN IN EVENT MODE
ESC=BACK
Setup Input Menu
SETUP INPUT_01
LABEL: INPUT_01
NORM OPEN/CLOSE: NO
ALARM/EVENT: AL
↑ ↓=NEXT ↵
=SELECT
LATCHED: N
DELAY: 00:01
Delay Time
DELAY TIME BEFORE
TRIGGER?
00 MIN : 01 SEC
↑ ↓=SELECT ↵
=NEXT/END